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Wed, 04 Aug 2021 11:45:24 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu.Lan@microsoft.com, rppt@kernel.org, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, martin.b.radev@gmail.com, ardb@kernel.org, rientjes@google.com, tj@kernel.org, keescook@chromium.org, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, parri.andrea@gmail.com Subject: [PATCH V2 01/14] x86/HV: Initialize GHCB page in Isolation VM Date: Wed, 4 Aug 2021 14:44:57 -0400 Message-Id: <20210804184513.512888-2-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210804184513.512888-1-ltykernel@gmail.com> References: <20210804184513.512888-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan Hyper-V exposes GHCB page via SEV ES GHCB MSR for SNP guest to communicate with hypervisor. Map GHCB page for all cpus to read/write MSR register and submit hvcall request via GHCB. Signed-off-by: Tianyu Lan --- arch/x86/hyperv/hv_init.c | 69 +++++++++++++++++++++++++++++++-- arch/x86/include/asm/mshyperv.h | 2 + include/asm-generic/mshyperv.h | 2 + 3 files changed, 69 insertions(+), 4 deletions(-) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 4a643a85d570..247df301491f 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include #include @@ -42,6 +43,31 @@ static void *hv_hypercall_pg_saved; struct hv_vp_assist_page **hv_vp_assist_page; EXPORT_SYMBOL_GPL(hv_vp_assist_page); +static int hyperv_init_ghcb(void) +{ + u64 ghcb_gpa; + void *ghcb_va; + void **ghcb_base; + + if (!ms_hyperv.ghcb_base) + return -EINVAL; + + /* + * GHCB page is allocated by paravisor. The address + * returned by MSR_AMD64_SEV_ES_GHCB is above shared + * ghcb boundary and map it here. + */ + rdmsrl(MSR_AMD64_SEV_ES_GHCB, ghcb_gpa); + ghcb_va = memremap(ghcb_gpa, HV_HYP_PAGE_SIZE, MEMREMAP_WB); + if (!ghcb_va) + return -ENOMEM; + + ghcb_base = (void **)this_cpu_ptr(ms_hyperv.ghcb_base); + *ghcb_base = ghcb_va; + + return 0; +} + static int hv_cpu_init(unsigned int cpu) { struct hv_vp_assist_page **hvp = &hv_vp_assist_page[smp_processor_id()]; @@ -75,6 +101,8 @@ static int hv_cpu_init(unsigned int cpu) wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, val); } + hyperv_init_ghcb(); + return 0; } @@ -167,6 +195,14 @@ static int hv_cpu_die(unsigned int cpu) { struct hv_reenlightenment_control re_ctrl; unsigned int new_cpu; + void **ghcb_va = NULL; + + if (ms_hyperv.ghcb_base) { + ghcb_va = (void **)this_cpu_ptr(ms_hyperv.ghcb_base); + if (*ghcb_va) + memunmap(*ghcb_va); + *ghcb_va = NULL; + } hv_common_cpu_die(cpu); @@ -340,9 +376,22 @@ void __init hyperv_init(void) VMALLOC_END, GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS, NUMA_NO_NODE, __builtin_return_address(0)); - if (hv_hypercall_pg == NULL) { - wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); - goto remove_cpuhp_state; + if (hv_hypercall_pg == NULL) + goto clean_guest_os_id; + + if (hv_isolation_type_snp()) { + ms_hyperv.ghcb_base = alloc_percpu(void *); + if (!ms_hyperv.ghcb_base) + goto clean_guest_os_id; + + if (hyperv_init_ghcb()) { + free_percpu(ms_hyperv.ghcb_base); + ms_hyperv.ghcb_base = NULL; + goto clean_guest_os_id; + } + + /* Hyper-V requires to write guest os id via ghcb in SNP IVM. */ + hv_ghcb_msr_write(HV_X64_MSR_GUEST_OS_ID, guest_id); } rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); @@ -403,7 +452,8 @@ void __init hyperv_init(void) hv_query_ext_cap(0); return; -remove_cpuhp_state: +clean_guest_os_id: + wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); cpuhp_remove_state(cpuhp); free_vp_assist_page: kfree(hv_vp_assist_page); @@ -431,6 +481,9 @@ void hyperv_cleanup(void) */ hv_hypercall_pg = NULL; + if (ms_hyperv.ghcb_base) + free_percpu(ms_hyperv.ghcb_base); + /* Reset the hypercall page */ hypercall_msr.as_uint64 = 0; wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); @@ -506,3 +559,11 @@ bool hv_is_isolation_supported(void) { return hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE; } + +DEFINE_STATIC_KEY_FALSE(isolation_type_snp); + +bool hv_isolation_type_snp(void) +{ + return static_branch_unlikely(&isolation_type_snp); +} +EXPORT_SYMBOL_GPL(hv_isolation_type_snp); diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index adccbc209169..6627cfd2bfba 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -11,6 +11,8 @@ #include #include +DECLARE_STATIC_KEY_FALSE(isolation_type_snp); + typedef int (*hyperv_fill_flush_list_func)( struct hv_guest_mapping_flush_list *flush, void *data); diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index c1ab6a6e72b5..4269f3174e58 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -36,6 +36,7 @@ struct ms_hyperv_info { u32 max_lp_index; u32 isolation_config_a; u32 isolation_config_b; + void __percpu **ghcb_base; }; extern struct ms_hyperv_info ms_hyperv; @@ -237,6 +238,7 @@ bool hv_is_hyperv_initialized(void); bool hv_is_hibernation_supported(void); enum hv_isolation_type hv_get_isolation_type(void); bool hv_is_isolation_supported(void); +bool hv_isolation_type_snp(void); void hyperv_cleanup(void); bool hv_query_ext_cap(u64 cap_query); #else /* CONFIG_HYPERV */ From patchwork Wed Aug 4 18:44:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 492588 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E02CBC43216 for ; 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Wed, 04 Aug 2021 11:45:28 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:f:1947:6842:b8a8:6f83]) by smtp.gmail.com with ESMTPSA id f5sm3325647pjo.23.2021.08.04.11.45.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Aug 2021 11:45:27 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu.Lan@microsoft.com, rppt@kernel.org, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, martin.b.radev@gmail.com, ardb@kernel.org, rientjes@google.com, tj@kernel.org, keescook@chromium.org, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, parri.andrea@gmail.com Subject: [PATCH V2 02/14] x86/HV: Initialize shared memory boundary in the Isolation VM. Date: Wed, 4 Aug 2021 14:44:58 -0400 Message-Id: <20210804184513.512888-3-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210804184513.512888-1-ltykernel@gmail.com> References: <20210804184513.512888-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan Hyper-V exposes shared memory boundary via cpuid HYPERV_CPUID_ISOLATION_CONFIG and store it in the shared_gpa_boundary of ms_hyperv struct. This prepares to share memory with host for SNP guest. Signed-off-by: Tianyu Lan --- arch/x86/kernel/cpu/mshyperv.c | 2 ++ include/asm-generic/mshyperv.h | 12 +++++++++++- 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index dcfbd2770d7f..773e84e134b3 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -327,6 +327,8 @@ static void __init ms_hyperv_init_platform(void) if (ms_hyperv.priv_high & HV_ISOLATION) { ms_hyperv.isolation_config_a = cpuid_eax(HYPERV_CPUID_ISOLATION_CONFIG); ms_hyperv.isolation_config_b = cpuid_ebx(HYPERV_CPUID_ISOLATION_CONFIG); + ms_hyperv.shared_gpa_boundary = + (u64)1 << ms_hyperv.shared_gpa_boundary_bits; pr_info("Hyper-V: Isolation Config: Group A 0x%x, Group B 0x%x\n", ms_hyperv.isolation_config_a, ms_hyperv.isolation_config_b); diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index 4269f3174e58..aa26d24a5ca9 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -35,8 +35,18 @@ struct ms_hyperv_info { u32 max_vp_index; u32 max_lp_index; u32 isolation_config_a; - u32 isolation_config_b; + union { + u32 isolation_config_b; + struct { + u32 cvm_type : 4; + u32 Reserved11 : 1; + u32 shared_gpa_boundary_active : 1; + u32 shared_gpa_boundary_bits : 6; + u32 Reserved12 : 20; + }; + }; void __percpu **ghcb_base; + u64 shared_gpa_boundary; }; extern struct ms_hyperv_info ms_hyperv; From patchwork Wed Aug 4 18:44:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 492006 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4F5AAC19F34 for ; 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Wed, 04 Aug 2021 11:45:30 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:f:1947:6842:b8a8:6f83]) by smtp.gmail.com with ESMTPSA id f5sm3325647pjo.23.2021.08.04.11.45.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Aug 2021 11:45:30 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu.Lan@microsoft.com, rppt@kernel.org, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, martin.b.radev@gmail.com, ardb@kernel.org, rientjes@google.com, tj@kernel.org, keescook@chromium.org, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, parri.andrea@gmail.com Subject: [PATCH V2 03/14] x86/set_memory: Add x86_set_memory_enc static call support Date: Wed, 4 Aug 2021 14:44:59 -0400 Message-Id: <20210804184513.512888-4-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210804184513.512888-1-ltykernel@gmail.com> References: <20210804184513.512888-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan Hyper-V and other platforms(e.g Intel and AMD) want to override the __set_memory_enc_dec(). Add x86_set_memory_enc static call here and platforms can hook their implementation. Signed-off-by: Tianyu Lan --- arch/x86/include/asm/set_memory.h | 4 ++++ arch/x86/mm/pat/set_memory.c | 9 +++++++++ 2 files changed, 13 insertions(+) diff --git a/arch/x86/include/asm/set_memory.h b/arch/x86/include/asm/set_memory.h index 43fa081a1adb..490f2cfc00fa 100644 --- a/arch/x86/include/asm/set_memory.h +++ b/arch/x86/include/asm/set_memory.h @@ -4,6 +4,7 @@ #include #include +#include /* * The set_memory_* API can be used to change various attributes of a virtual @@ -84,6 +85,9 @@ int set_direct_map_invalid_noflush(struct page *page); int set_direct_map_default_noflush(struct page *page); bool kernel_page_present(struct page *page); +int dummy_set_memory_enc(unsigned long addr, int numpages, bool enc); +DECLARE_STATIC_CALL(x86_set_memory_enc, dummy_set_memory_enc); + extern int kernel_set_to_readonly; #ifdef CONFIG_X86_64 diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index ad8a5c586a35..68e9ab522cea 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include @@ -66,6 +67,9 @@ static const int cpa_warn_level = CPA_PROTECT; */ static DEFINE_SPINLOCK(cpa_lock); +static int default_set_memory_enc(unsigned long addr, int numpages, bool enc); +DEFINE_STATIC_CALL(x86_set_memory_enc, default_set_memory_enc); + #define CPA_FLUSHTLB 1 #define CPA_ARRAY 2 #define CPA_PAGES_ARRAY 4 @@ -1981,6 +1985,11 @@ int set_memory_global(unsigned long addr, int numpages) } static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc) +{ + return static_call(x86_set_memory_enc)(addr, numpages, enc); +} + +static int default_set_memory_enc(unsigned long addr, int numpages, bool enc) { struct cpa_data cpa; int ret; From patchwork Wed Aug 4 18:45:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 492005 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3C02AC41537 for ; 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Wed, 04 Aug 2021 11:45:33 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:f:1947:6842:b8a8:6f83]) by smtp.gmail.com with ESMTPSA id f5sm3325647pjo.23.2021.08.04.11.45.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Aug 2021 11:45:33 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu.Lan@microsoft.com, rppt@kernel.org, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, martin.b.radev@gmail.com, ardb@kernel.org, rientjes@google.com, tj@kernel.org, keescook@chromium.org, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, parri.andrea@gmail.com Subject: [PATCH V2 04/14] x86/HV: Add new hvcall guest address host visibility support Date: Wed, 4 Aug 2021 14:45:00 -0400 Message-Id: <20210804184513.512888-5-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210804184513.512888-1-ltykernel@gmail.com> References: <20210804184513.512888-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan Add new hvcall guest address host visibility support to mark memory visible to host. Override x86_set_memory_enc static call with hv hook to mark memory visible to host via set_ memory_decrypted(). Signed-off-by: Tianyu Lan --- Change since v1: * Use new staic call x86_set_memory_enc to avoid add Hyper-V specific check in the set_memory code. Signed-off-by: Tianyu Lan --- arch/x86/hyperv/Makefile | 2 +- arch/x86/hyperv/hv_init.c | 6 ++ arch/x86/hyperv/ivm.c | 114 +++++++++++++++++++++++++++++ arch/x86/include/asm/hyperv-tlfs.h | 20 +++++ arch/x86/include/asm/mshyperv.h | 4 +- include/asm-generic/hyperv-tlfs.h | 1 + 6 files changed, 145 insertions(+), 2 deletions(-) create mode 100644 arch/x86/hyperv/ivm.c diff --git a/arch/x86/hyperv/Makefile b/arch/x86/hyperv/Makefile index 48e2c51464e8..5d2de10809ae 100644 --- a/arch/x86/hyperv/Makefile +++ b/arch/x86/hyperv/Makefile @@ -1,5 +1,5 @@ # SPDX-License-Identifier: GPL-2.0-only -obj-y := hv_init.o mmu.o nested.o irqdomain.o +obj-y := hv_init.o mmu.o nested.o irqdomain.o ivm.o obj-$(CONFIG_X86_64) += hv_apic.o hv_proc.o ifdef CONFIG_X86_64 diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 247df301491f..57962d407484 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -29,6 +30,7 @@ #include #include #include +#include int hyperv_init_cpuhp; u64 hv_current_partition_id = ~0ull; @@ -450,6 +452,10 @@ void __init hyperv_init(void) /* Query the VMs extended capability once, so that it can be cached. */ hv_query_ext_cap(0); + + if (hv_is_isolation_supported()) + static_call_update(x86_set_memory_enc, hv_set_mem_enc); + return; clean_guest_os_id: diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c new file mode 100644 index 000000000000..6d130ba03f41 --- /dev/null +++ b/arch/x86/hyperv/ivm.c @@ -0,0 +1,114 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Hyper-V Isolation VM interface with paravisor and hypervisor + * + * Author: + * Tianyu Lan + */ + +#include +#include +#include +#include +#include +#include + +/* + * hv_mark_gpa_visibility - Set pages visible to host via hvcall. + * + * In Isolation VM, all guest memory is encripted from host and guest + * needs to set memory visible to host via hvcall before sharing memory + * with host. + */ +int hv_mark_gpa_visibility(u16 count, const u64 pfn[], + enum hv_mem_host_visibility visibility) +{ + struct hv_gpa_range_for_visibility **input_pcpu, *input; + u16 pages_processed; + u64 hv_status; + unsigned long flags; + + /* no-op if partition isolation is not enabled */ + if (!hv_is_isolation_supported()) + return 0; + + if (count > HV_MAX_MODIFY_GPA_REP_COUNT) { + pr_err("Hyper-V: GPA count:%d exceeds supported:%lu\n", count, + HV_MAX_MODIFY_GPA_REP_COUNT); + return -EINVAL; + } + + local_irq_save(flags); + input_pcpu = (struct hv_gpa_range_for_visibility **) + this_cpu_ptr(hyperv_pcpu_input_arg); + input = *input_pcpu; + if (unlikely(!input)) { + local_irq_restore(flags); + return -EINVAL; + } + + input->partition_id = HV_PARTITION_ID_SELF; + input->host_visibility = visibility; + input->reserved0 = 0; + input->reserved1 = 0; + memcpy((void *)input->gpa_page_list, pfn, count * sizeof(*pfn)); + hv_status = hv_do_rep_hypercall( + HVCALL_MODIFY_SPARSE_GPA_PAGE_HOST_VISIBILITY, count, + 0, input, &pages_processed); + local_irq_restore(flags); + + if (!(hv_status & HV_HYPERCALL_RESULT_MASK)) + return 0; + + return hv_status & HV_HYPERCALL_RESULT_MASK; +} +EXPORT_SYMBOL(hv_mark_gpa_visibility); + +/* + * hv_set_mem_host_visibility - Set specified memory visible to host. + * + * In Isolation VM, all guest memory is encrypted from host and guest + * needs to set memory visible to host via hvcall before sharing memory + * with host. This function works as wrap of hv_mark_gpa_visibility() + * with memory base and size. + */ +static int hv_set_mem_host_visibility(void *kbuffer, int pagecount, + enum hv_mem_host_visibility visibility) +{ + u64 *pfn_array; + int ret = 0; + int i, pfn; + + if (!hv_is_isolation_supported() || !ms_hyperv.ghcb_base) + return 0; + + pfn_array = kzalloc(HV_HYP_PAGE_SIZE, GFP_KERNEL); + if (!pfn_array) + return -ENOMEM; + + for (i = 0, pfn = 0; i < pagecount; i++) { + pfn_array[pfn] = virt_to_hvpfn(kbuffer + i * HV_HYP_PAGE_SIZE); + pfn++; + + if (pfn == HV_MAX_MODIFY_GPA_REP_COUNT || i == pagecount - 1) { + ret |= hv_mark_gpa_visibility(pfn, pfn_array, + visibility); + pfn = 0; + + if (ret) + goto err_free_pfn_array; + } + } + + err_free_pfn_array: + kfree(pfn_array); + return ret; +} + +int hv_set_mem_enc(unsigned long addr, int numpages, bool enc) +{ + enum hv_mem_host_visibility visibility = enc ? VMBUS_PAGE_NOT_VISIBLE : + VMBUS_PAGE_VISIBLE_READ_WRITE; + + return hv_set_mem_host_visibility((void *)addr, numpages, visibility); +} diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h index f1366ce609e3..1b3e80bcca5b 100644 --- a/arch/x86/include/asm/hyperv-tlfs.h +++ b/arch/x86/include/asm/hyperv-tlfs.h @@ -276,6 +276,13 @@ enum hv_isolation_type { #define HV_X64_MSR_TIME_REF_COUNT HV_REGISTER_TIME_REF_COUNT #define HV_X64_MSR_REFERENCE_TSC HV_REGISTER_REFERENCE_TSC +/* Hyper-V memory host visibility */ +enum hv_mem_host_visibility { + VMBUS_PAGE_NOT_VISIBLE = 0, + VMBUS_PAGE_VISIBLE_READ_ONLY = 1, + VMBUS_PAGE_VISIBLE_READ_WRITE = 3 +}; + /* * Declare the MSR used to setup pages used to communicate with the hypervisor. */ @@ -578,4 +585,17 @@ enum hv_interrupt_type { #include +/* All input parameters should be in single page. */ +#define HV_MAX_MODIFY_GPA_REP_COUNT \ + ((PAGE_SIZE / sizeof(u64)) - 2) + +/* HvCallModifySparseGpaPageHostVisibility hypercall */ +struct hv_gpa_range_for_visibility { + u64 partition_id; + u32 host_visibility:2; + u32 reserved0:30; + u32 reserved1; + u64 gpa_page_list[HV_MAX_MODIFY_GPA_REP_COUNT]; +} __packed; + #endif diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 6627cfd2bfba..33f0e95c9b76 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -190,7 +190,9 @@ struct irq_domain *hv_create_pci_msi_domain(void); int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector, struct hv_interrupt_entry *entry); int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry); - +int hv_mark_gpa_visibility(u16 count, const u64 pfn[], + enum hv_mem_host_visibility visibility); +int hv_set_mem_enc(unsigned long addr, int numpages, bool enc); #else /* CONFIG_HYPERV */ static inline void hyperv_init(void) {} static inline void hyperv_setup_mmu_ops(void) {} diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h index 56348a541c50..8ed6733d5146 100644 --- a/include/asm-generic/hyperv-tlfs.h +++ b/include/asm-generic/hyperv-tlfs.h @@ -158,6 +158,7 @@ struct ms_hyperv_tsc_page { #define HVCALL_RETARGET_INTERRUPT 0x007e #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE 0x00af #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST 0x00b0 +#define HVCALL_MODIFY_SPARSE_GPA_PAGE_HOST_VISIBILITY 0x00db /* Extended hypercalls */ #define HV_EXT_CALL_QUERY_CAPABILITIES 0x8001 From patchwork Wed Aug 4 18:45:01 2021 Content-Type: text/plain; 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Wed, 04 Aug 2021 11:45:35 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu.Lan@microsoft.com, rppt@kernel.org, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, martin.b.radev@gmail.com, ardb@kernel.org, rientjes@google.com, tj@kernel.org, keescook@chromium.org, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, parri.andrea@gmail.com Subject: [PATCH V2 05/14] HV: Mark vmbus ring buffer visible to host in Isolation VM Date: Wed, 4 Aug 2021 14:45:01 -0400 Message-Id: <20210804184513.512888-6-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210804184513.512888-1-ltykernel@gmail.com> References: <20210804184513.512888-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan Mark vmbus ring buffer visible with set_memory_decrypted() when establish gpadl handle. Signed-off-by: Tianyu Lan --- drivers/hv/channel.c | 44 ++++++++++++++++++++++++++++++++++++++++-- include/linux/hyperv.h | 11 +++++++++++ 2 files changed, 53 insertions(+), 2 deletions(-) diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c index f3761c73b074..4c4717c26240 100644 --- a/drivers/hv/channel.c +++ b/drivers/hv/channel.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include @@ -465,7 +466,14 @@ static int __vmbus_establish_gpadl(struct vmbus_channel *channel, struct list_head *curr; u32 next_gpadl_handle; unsigned long flags; - int ret = 0; + int ret = 0, index; + + index = atomic_inc_return(&channel->gpadl_index) - 1; + + if (index > VMBUS_GPADL_RANGE_COUNT - 1) { + pr_err("Gpadl handle position(%d) has been occupied.\n", index); + return -ENOSPC; + } next_gpadl_handle = (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1); @@ -474,6 +482,13 @@ static int __vmbus_establish_gpadl(struct vmbus_channel *channel, if (ret) return ret; + ret = set_memory_decrypted((unsigned long)kbuffer, + HVPFN_UP(size)); + if (ret) { + pr_warn("Failed to set host visibility.\n"); + return ret; + } + init_completion(&msginfo->waitevent); msginfo->waiting_channel = channel; @@ -539,6 +554,10 @@ static int __vmbus_establish_gpadl(struct vmbus_channel *channel, /* At this point, we received the gpadl created msg */ *gpadl_handle = gpadlmsg->gpadl; + channel->gpadl_array[index].size = size; + channel->gpadl_array[index].buffer = kbuffer; + channel->gpadl_array[index].gpadlhandle = *gpadl_handle; + cleanup: spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); list_del(&msginfo->msglistentry); @@ -549,6 +568,13 @@ static int __vmbus_establish_gpadl(struct vmbus_channel *channel, } kfree(msginfo); + + if (ret) { + set_memory_encrypted((unsigned long)kbuffer, + HVPFN_UP(size)); + atomic_dec(&channel->gpadl_index); + } + return ret; } @@ -676,6 +702,7 @@ static int __vmbus_open(struct vmbus_channel *newchannel, /* Establish the gpadl for the ring buffer */ newchannel->ringbuffer_gpadlhandle = 0; + atomic_set(&newchannel->gpadl_index, 0); err = __vmbus_establish_gpadl(newchannel, HV_GPADL_RING, page_address(newchannel->ringbuffer_page), @@ -811,7 +838,7 @@ int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) struct vmbus_channel_gpadl_teardown *msg; struct vmbus_channel_msginfo *info; unsigned long flags; - int ret; + int ret, i; info = kzalloc(sizeof(*info) + sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); @@ -859,6 +886,19 @@ int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); kfree(info); + + /* Find gpadl buffer virtual address and size. */ + for (i = 0; i < VMBUS_GPADL_RANGE_COUNT; i++) + if (channel->gpadl_array[i].gpadlhandle == gpadl_handle) + break; + + if (set_memory_encrypted((unsigned long)channel->gpadl_array[i].buffer, + HVPFN_UP(channel->gpadl_array[i].size))) + pr_warn("Fail to set mem host visibility.\n"); + + channel->gpadl_array[i].gpadlhandle = 0; + atomic_dec(&channel->gpadl_index); + return ret; } EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 2e859d2f9609..cbe376b82de3 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -809,6 +809,14 @@ struct vmbus_device { #define VMBUS_DEFAULT_MAX_PKT_SIZE 4096 +struct vmbus_gpadl { + u32 gpadlhandle; + u32 size; + void *buffer; +}; + +#define VMBUS_GPADL_RANGE_COUNT 3 + struct vmbus_channel { struct list_head listentry; @@ -829,6 +837,9 @@ struct vmbus_channel { struct completion rescind_event; u32 ringbuffer_gpadlhandle; + /* GPADL_RING and Send/Receive GPADL_BUFFER. */ + struct vmbus_gpadl gpadl_array[VMBUS_GPADL_RANGE_COUNT]; + atomic_t gpadl_index; /* Allocated memory for ring buffer */ struct page *ringbuffer_page; From patchwork Wed Aug 4 18:45:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 492585 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 432D1C4320E for ; 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Wed, 04 Aug 2021 11:45:38 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:f:1947:6842:b8a8:6f83]) by smtp.gmail.com with ESMTPSA id f5sm3325647pjo.23.2021.08.04.11.45.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Aug 2021 11:45:38 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu.Lan@microsoft.com, rppt@kernel.org, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, martin.b.radev@gmail.com, ardb@kernel.org, rientjes@google.com, tj@kernel.org, keescook@chromium.org, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, parri.andrea@gmail.com Subject: [PATCH V2 06/14] HV: Add Write/Read MSR registers via ghcb page Date: Wed, 4 Aug 2021 14:45:02 -0400 Message-Id: <20210804184513.512888-7-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210804184513.512888-1-ltykernel@gmail.com> References: <20210804184513.512888-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan Hyper-V provides GHCB protocol to write Synthetic Interrupt Controller MSR registers in Isolation VM with AMD SEV SNP and these registers are emulated by hypervisor directly. Hyper-V requires to write SINTx MSR registers twice. First writes MSR via GHCB page to communicate with hypervisor and then writes wrmsr instruction to talk with paravisor which runs in VMPL0. Guest OS ID MSR also needs to be set via GHCB. Signed-off-by: Tianyu Lan --- Change since v1: * Introduce sev_es_ghcb_hv_call_simple() and share code between SEV and Hyper-V code. Signed-off-by: Tianyu Lan --- arch/x86/hyperv/hv_init.c | 24 +------ arch/x86/hyperv/ivm.c | 110 +++++++++++++++++++++++++++++ arch/x86/include/asm/mshyperv.h | 78 +++++++++++++++++++- arch/x86/include/asm/sev.h | 3 + arch/x86/kernel/cpu/mshyperv.c | 3 + arch/x86/kernel/sev-shared.c | 63 ++++++++++------- drivers/hv/hv.c | 121 ++++++++++++++++++++++---------- include/asm-generic/mshyperv.h | 12 +++- 8 files changed, 326 insertions(+), 88 deletions(-) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 57962d407484..1e35979370a4 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -382,7 +382,7 @@ void __init hyperv_init(void) goto clean_guest_os_id; if (hv_isolation_type_snp()) { - ms_hyperv.ghcb_base = alloc_percpu(void *); + ms_hyperv.ghcb_base = alloc_percpu(union hv_ghcb __percpu *); if (!ms_hyperv.ghcb_base) goto clean_guest_os_id; @@ -479,6 +479,7 @@ void hyperv_cleanup(void) /* Reset our OS id */ wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); + hv_ghcb_msr_write(HV_X64_MSR_GUEST_OS_ID, 0); /* * Reset hypercall page reference before reset the page, @@ -552,24 +553,3 @@ bool hv_is_hyperv_initialized(void) return hypercall_msr.enable; } EXPORT_SYMBOL_GPL(hv_is_hyperv_initialized); - -enum hv_isolation_type hv_get_isolation_type(void) -{ - if (!(ms_hyperv.priv_high & HV_ISOLATION)) - return HV_ISOLATION_TYPE_NONE; - return FIELD_GET(HV_ISOLATION_TYPE, ms_hyperv.isolation_config_b); -} -EXPORT_SYMBOL_GPL(hv_get_isolation_type); - -bool hv_is_isolation_supported(void) -{ - return hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE; -} - -DEFINE_STATIC_KEY_FALSE(isolation_type_snp); - -bool hv_isolation_type_snp(void) -{ - return static_branch_unlikely(&isolation_type_snp); -} -EXPORT_SYMBOL_GPL(hv_isolation_type_snp); diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c index 6d130ba03f41..a135020002fe 100644 --- a/arch/x86/hyperv/ivm.c +++ b/arch/x86/hyperv/ivm.c @@ -6,6 +6,8 @@ * Tianyu Lan */ +#include +#include #include #include #include @@ -13,6 +15,114 @@ #include #include +void hv_ghcb_msr_write(u64 msr, u64 value) +{ + union hv_ghcb *hv_ghcb; + void **ghcb_base; + unsigned long flags; + + if (!ms_hyperv.ghcb_base) + return; + + WARN_ON(in_nmi()); + + local_irq_save(flags); + ghcb_base = (void **)this_cpu_ptr(ms_hyperv.ghcb_base); + hv_ghcb = (union hv_ghcb *)*ghcb_base; + if (!hv_ghcb) { + local_irq_restore(flags); + return; + } + + ghcb_set_rcx(&hv_ghcb->ghcb, msr); + ghcb_set_rax(&hv_ghcb->ghcb, lower_32_bits(value)); + ghcb_set_rdx(&hv_ghcb->ghcb, value >> 32); + + if (sev_es_ghcb_hv_call_simple(&hv_ghcb->ghcb, SVM_EXIT_MSR, 1, 0)) + pr_warn("Fail to write msr via ghcb %llx.\n", msr); + + local_irq_restore(flags); +} + +void hv_ghcb_msr_read(u64 msr, u64 *value) +{ + union hv_ghcb *hv_ghcb; + void **ghcb_base; + unsigned long flags; + + if (!ms_hyperv.ghcb_base) + return; + + WARN_ON(in_nmi()); + + local_irq_save(flags); + ghcb_base = (void **)this_cpu_ptr(ms_hyperv.ghcb_base); + hv_ghcb = (union hv_ghcb *)*ghcb_base; + if (!hv_ghcb) { + local_irq_restore(flags); + return; + } + + ghcb_set_rcx(&hv_ghcb->ghcb, msr); + if (sev_es_ghcb_hv_call_simple(&hv_ghcb->ghcb, SVM_EXIT_MSR, 0, 0)) + pr_warn("Fail to read msr via ghcb %llx.\n", msr); + else + *value = (u64)lower_32_bits(hv_ghcb->ghcb.save.rax) + | ((u64)lower_32_bits(hv_ghcb->ghcb.save.rdx) << 32); + local_irq_restore(flags); +} + +void hv_sint_rdmsrl_ghcb(u64 msr, u64 *value) +{ + hv_ghcb_msr_read(msr, value); +} +EXPORT_SYMBOL_GPL(hv_sint_rdmsrl_ghcb); + +void hv_sint_wrmsrl_ghcb(u64 msr, u64 value) +{ + hv_ghcb_msr_write(msr, value); + + /* Write proxy bit vua wrmsrl instruction. */ + if (msr >= HV_X64_MSR_SINT0 && msr <= HV_X64_MSR_SINT15) + wrmsrl(msr, value | 1 << 20); +} +EXPORT_SYMBOL_GPL(hv_sint_wrmsrl_ghcb); + +void hv_signal_eom_ghcb(void) +{ + hv_sint_wrmsrl_ghcb(HV_X64_MSR_EOM, 0); +} +EXPORT_SYMBOL_GPL(hv_signal_eom_ghcb); + +enum hv_isolation_type hv_get_isolation_type(void) +{ + if (!(ms_hyperv.priv_high & HV_ISOLATION)) + return HV_ISOLATION_TYPE_NONE; + return FIELD_GET(HV_ISOLATION_TYPE, ms_hyperv.isolation_config_b); +} +EXPORT_SYMBOL_GPL(hv_get_isolation_type); + +/* + * hv_is_isolation_supported - Check system runs in the Hyper-V + * isolation VM. + */ +bool hv_is_isolation_supported(void) +{ + return hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE; +} + +DEFINE_STATIC_KEY_FALSE(isolation_type_snp); + +/* + * hv_isolation_type_snp - Check system runs in the AMD SEV-SNP based + * isolation VM. + */ +bool hv_isolation_type_snp(void) +{ + return static_branch_unlikely(&isolation_type_snp); +} +EXPORT_SYMBOL_GPL(hv_isolation_type_snp); + /* * hv_mark_gpa_visibility - Set pages visible to host via hvcall. * diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 33f0e95c9b76..3cccce14ff4c 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -30,6 +30,63 @@ static inline u64 hv_get_register(unsigned int reg) return value; } +#define hv_get_sint_reg(val, reg) { \ + if (hv_isolation_type_snp()) \ + hv_get_##reg##_ghcb(&val); \ + else \ + rdmsrl(HV_X64_MSR_##reg, val); \ + } + +#define hv_set_sint_reg(val, reg) { \ + if (hv_isolation_type_snp()) \ + hv_set_##reg##_ghcb(val); \ + else \ + wrmsrl(HV_X64_MSR_##reg, val); \ + } + + +#define hv_get_simp(val) hv_get_sint_reg(val, SIMP) +#define hv_get_siefp(val) hv_get_sint_reg(val, SIEFP) + +#define hv_set_simp(val) hv_set_sint_reg(val, SIMP) +#define hv_set_siefp(val) hv_set_sint_reg(val, SIEFP) + +#define hv_get_synic_state(val) { \ + if (hv_isolation_type_snp()) \ + hv_get_synic_state_ghcb(&val); \ + else \ + rdmsrl(HV_X64_MSR_SCONTROL, val); \ + } +#define hv_set_synic_state(val) { \ + if (hv_isolation_type_snp()) \ + hv_set_synic_state_ghcb(val); \ + else \ + wrmsrl(HV_X64_MSR_SCONTROL, val); \ + } + +#define hv_get_vp_index(index) rdmsrl(HV_X64_MSR_VP_INDEX, index) + +#define hv_signal_eom() { \ + if (hv_isolation_type_snp() && \ + old_msg_type != HVMSG_TIMER_EXPIRED) \ + hv_signal_eom_ghcb(); \ + else \ + wrmsrl(HV_X64_MSR_EOM, 0); \ + } + +#define hv_get_synint_state(int_num, val) { \ + if (hv_isolation_type_snp()) \ + hv_get_synint_state_ghcb(int_num, &val);\ + else \ + rdmsrl(HV_X64_MSR_SINT0 + int_num, val);\ + } +#define hv_set_synint_state(int_num, val) { \ + if (hv_isolation_type_snp()) \ + hv_set_synint_state_ghcb(int_num, val); \ + else \ + wrmsrl(HV_X64_MSR_SINT0 + int_num, val);\ + } + #define hv_get_raw_timer() rdtsc_ordered() void hyperv_vector_handler(struct pt_regs *regs); @@ -193,6 +250,25 @@ int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry); int hv_mark_gpa_visibility(u16 count, const u64 pfn[], enum hv_mem_host_visibility visibility); int hv_set_mem_enc(unsigned long addr, int numpages, bool enc); +void hv_sint_wrmsrl_ghcb(u64 msr, u64 value); +void hv_sint_rdmsrl_ghcb(u64 msr, u64 *value); +void hv_signal_eom_ghcb(void); +void hv_ghcb_msr_write(u64 msr, u64 value); +void hv_ghcb_msr_read(u64 msr, u64 *value); + +#define hv_get_synint_state_ghcb(int_num, val) \ + hv_sint_rdmsrl_ghcb(HV_X64_MSR_SINT0 + int_num, val) +#define hv_set_synint_state_ghcb(int_num, val) \ + hv_sint_wrmsrl_ghcb(HV_X64_MSR_SINT0 + int_num, val) + +#define hv_get_SIMP_ghcb(val) hv_sint_rdmsrl_ghcb(HV_X64_MSR_SIMP, val) +#define hv_set_SIMP_ghcb(val) hv_sint_wrmsrl_ghcb(HV_X64_MSR_SIMP, val) + +#define hv_get_SIEFP_ghcb(val) hv_sint_rdmsrl_ghcb(HV_X64_MSR_SIEFP, val) +#define hv_set_SIEFP_ghcb(val) hv_sint_wrmsrl_ghcb(HV_X64_MSR_SIEFP, val) + +#define hv_get_synic_state_ghcb(val) hv_sint_rdmsrl_ghcb(HV_X64_MSR_SCONTROL, val) +#define hv_set_synic_state_ghcb(val) hv_sint_wrmsrl_ghcb(HV_X64_MSR_SCONTROL, val) #else /* CONFIG_HYPERV */ static inline void hyperv_init(void) {} static inline void hyperv_setup_mmu_ops(void) {} @@ -209,9 +285,9 @@ static inline int hyperv_flush_guest_mapping_range(u64 as, { return -1; } +static inline void hv_signal_eom_ghcb(void) { }; #endif /* CONFIG_HYPERV */ - #include #endif diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h index fa5cd05d3b5b..81beb2a8031b 100644 --- a/arch/x86/include/asm/sev.h +++ b/arch/x86/include/asm/sev.h @@ -81,6 +81,9 @@ static __always_inline void sev_es_nmi_complete(void) __sev_es_nmi_complete(); } extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd); +extern enum es_result sev_es_ghcb_hv_call_simple(struct ghcb *ghcb, + u64 exit_code, u64 exit_info_1, + u64 exit_info_2); #else static inline void sev_es_ist_enter(struct pt_regs *regs) { } static inline void sev_es_ist_exit(void) { } diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 773e84e134b3..46a09cdfa77a 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -332,6 +332,9 @@ static void __init ms_hyperv_init_platform(void) pr_info("Hyper-V: Isolation Config: Group A 0x%x, Group B 0x%x\n", ms_hyperv.isolation_config_a, ms_hyperv.isolation_config_b); + + if (hv_get_isolation_type() == HV_ISOLATION_TYPE_SNP) + static_branch_enable(&isolation_type_snp); } if (hv_max_functions_eax >= HYPERV_CPUID_NESTED_FEATURES) { diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c index 9f90f460a28c..dd7f37de640b 100644 --- a/arch/x86/kernel/sev-shared.c +++ b/arch/x86/kernel/sev-shared.c @@ -94,10 +94,9 @@ static void vc_finish_insn(struct es_em_ctxt *ctxt) ctxt->regs->ip += ctxt->insn.length; } -static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb, - struct es_em_ctxt *ctxt, - u64 exit_code, u64 exit_info_1, - u64 exit_info_2) +enum es_result sev_es_ghcb_hv_call_simple(struct ghcb *ghcb, + u64 exit_code, u64 exit_info_1, + u64 exit_info_2) { enum es_result ret; @@ -109,29 +108,45 @@ static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb, ghcb_set_sw_exit_info_1(ghcb, exit_info_1); ghcb_set_sw_exit_info_2(ghcb, exit_info_2); - sev_es_wr_ghcb_msr(__pa(ghcb)); VMGEXIT(); - if ((ghcb->save.sw_exit_info_1 & 0xffffffff) == 1) { - u64 info = ghcb->save.sw_exit_info_2; - unsigned long v; - - info = ghcb->save.sw_exit_info_2; - v = info & SVM_EVTINJ_VEC_MASK; - - /* Check if exception information from hypervisor is sane. */ - if ((info & SVM_EVTINJ_VALID) && - ((v == X86_TRAP_GP) || (v == X86_TRAP_UD)) && - ((info & SVM_EVTINJ_TYPE_MASK) == SVM_EVTINJ_TYPE_EXEPT)) { - ctxt->fi.vector = v; - if (info & SVM_EVTINJ_VALID_ERR) - ctxt->fi.error_code = info >> 32; - ret = ES_EXCEPTION; - } else { - ret = ES_VMM_ERROR; - } - } else { + if ((ghcb->save.sw_exit_info_1 & 0xffffffff) == 1) + ret = ES_VMM_ERROR; + else ret = ES_OK; + + return ret; +} + +static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb, + struct es_em_ctxt *ctxt, + u64 exit_code, u64 exit_info_1, + u64 exit_info_2) +{ + unsigned long v; + enum es_result ret; + u64 info; + + sev_es_wr_ghcb_msr(__pa(ghcb)); + + ret = sev_es_ghcb_hv_call_simple(ghcb, exit_code, exit_info_1, + exit_info_2); + if (ret == ES_OK) + return ret; + + info = ghcb->save.sw_exit_info_2; + v = info & SVM_EVTINJ_VEC_MASK; + + /* Check if exception information from hypervisor is sane. */ + if ((info & SVM_EVTINJ_VALID) && + ((v == X86_TRAP_GP) || (v == X86_TRAP_UD)) && + ((info & SVM_EVTINJ_TYPE_MASK) == SVM_EVTINJ_TYPE_EXEPT)) { + ctxt->fi.vector = v; + if (info & SVM_EVTINJ_VALID_ERR) + ctxt->fi.error_code = info >> 32; + ret = ES_EXCEPTION; + } else { + ret = ES_VMM_ERROR; } return ret; diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index e83507f49676..59f7173c4d9f 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -8,6 +8,7 @@ */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include #include #include #include @@ -136,17 +137,24 @@ int hv_synic_alloc(void) tasklet_init(&hv_cpu->msg_dpc, vmbus_on_msg_dpc, (unsigned long) hv_cpu); - hv_cpu->synic_message_page = - (void *)get_zeroed_page(GFP_ATOMIC); - if (hv_cpu->synic_message_page == NULL) { - pr_err("Unable to allocate SYNIC message page\n"); - goto err; - } + /* + * Synic message and event pages are allocated by paravisor. + * Skip these pages allocation here. + */ + if (!hv_isolation_type_snp()) { + hv_cpu->synic_message_page = + (void *)get_zeroed_page(GFP_ATOMIC); + if (hv_cpu->synic_message_page == NULL) { + pr_err("Unable to allocate SYNIC message page\n"); + goto err; + } - hv_cpu->synic_event_page = (void *)get_zeroed_page(GFP_ATOMIC); - if (hv_cpu->synic_event_page == NULL) { - pr_err("Unable to allocate SYNIC event page\n"); - goto err; + hv_cpu->synic_event_page = + (void *)get_zeroed_page(GFP_ATOMIC); + if (hv_cpu->synic_event_page == NULL) { + pr_err("Unable to allocate SYNIC event page\n"); + goto err; + } } hv_cpu->post_msg_page = (void *)get_zeroed_page(GFP_ATOMIC); @@ -173,10 +181,17 @@ void hv_synic_free(void) for_each_present_cpu(cpu) { struct hv_per_cpu_context *hv_cpu = per_cpu_ptr(hv_context.cpu_context, cpu); + free_page((unsigned long)hv_cpu->post_msg_page); + + /* + * Synic message and event pages are allocated by paravisor. + * Skip free these pages here. + */ + if (hv_isolation_type_snp()) + continue; free_page((unsigned long)hv_cpu->synic_event_page); free_page((unsigned long)hv_cpu->synic_message_page); - free_page((unsigned long)hv_cpu->post_msg_page); } kfree(hv_context.hv_numa_map); @@ -199,26 +214,43 @@ void hv_synic_enable_regs(unsigned int cpu) union hv_synic_scontrol sctrl; /* Setup the Synic's message page */ - simp.as_uint64 = hv_get_register(HV_REGISTER_SIMP); + hv_get_simp(simp.as_uint64); simp.simp_enabled = 1; - simp.base_simp_gpa = virt_to_phys(hv_cpu->synic_message_page) - >> HV_HYP_PAGE_SHIFT; - hv_set_register(HV_REGISTER_SIMP, simp.as_uint64); + if (hv_isolation_type_snp()) { + hv_cpu->synic_message_page + = memremap(simp.base_simp_gpa << HV_HYP_PAGE_SHIFT, + HV_HYP_PAGE_SIZE, MEMREMAP_WB); + if (!hv_cpu->synic_message_page) + pr_err("Fail to map syinc message page.\n"); + } else { + simp.base_simp_gpa = virt_to_phys(hv_cpu->synic_message_page) + >> HV_HYP_PAGE_SHIFT; + } + + hv_set_simp(simp.as_uint64); /* Setup the Synic's event page */ - siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP); + hv_get_siefp(siefp.as_uint64); siefp.siefp_enabled = 1; - siefp.base_siefp_gpa = virt_to_phys(hv_cpu->synic_event_page) - >> HV_HYP_PAGE_SHIFT; - hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64); + if (hv_isolation_type_snp()) { + hv_cpu->synic_event_page = + memremap(siefp.base_siefp_gpa << HV_HYP_PAGE_SHIFT, + HV_HYP_PAGE_SIZE, MEMREMAP_WB); + + if (!hv_cpu->synic_event_page) + pr_err("Fail to map syinc event page.\n"); + } else { + siefp.base_siefp_gpa = virt_to_phys(hv_cpu->synic_event_page) + >> HV_HYP_PAGE_SHIFT; + } + hv_set_siefp(siefp.as_uint64); /* Setup the shared SINT. */ if (vmbus_irq != -1) enable_percpu_irq(vmbus_irq, 0); - shared_sint.as_uint64 = hv_get_register(HV_REGISTER_SINT0 + - VMBUS_MESSAGE_SINT); + hv_get_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64); shared_sint.vector = vmbus_interrupt; shared_sint.masked = false; @@ -233,14 +265,12 @@ void hv_synic_enable_regs(unsigned int cpu) #else shared_sint.auto_eoi = 0; #endif - hv_set_register(HV_REGISTER_SINT0 + VMBUS_MESSAGE_SINT, - shared_sint.as_uint64); + hv_set_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64); /* Enable the global synic bit */ - sctrl.as_uint64 = hv_get_register(HV_REGISTER_SCONTROL); + hv_get_synic_state(sctrl.as_uint64); sctrl.enable = 1; - - hv_set_register(HV_REGISTER_SCONTROL, sctrl.as_uint64); + hv_set_synic_state(sctrl.as_uint64); } int hv_synic_init(unsigned int cpu) @@ -257,37 +287,50 @@ int hv_synic_init(unsigned int cpu) */ void hv_synic_disable_regs(unsigned int cpu) { + struct hv_per_cpu_context *hv_cpu + = per_cpu_ptr(hv_context.cpu_context, cpu); union hv_synic_sint shared_sint; union hv_synic_simp simp; union hv_synic_siefp siefp; union hv_synic_scontrol sctrl; - shared_sint.as_uint64 = hv_get_register(HV_REGISTER_SINT0 + - VMBUS_MESSAGE_SINT); - + hv_get_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64); shared_sint.masked = 1; + hv_set_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64); + /* Need to correctly cleanup in the case of SMP!!! */ /* Disable the interrupt */ - hv_set_register(HV_REGISTER_SINT0 + VMBUS_MESSAGE_SINT, - shared_sint.as_uint64); + hv_get_simp(simp.as_uint64); - simp.as_uint64 = hv_get_register(HV_REGISTER_SIMP); + /* + * In Isolation VM, sim and sief pages are allocated by + * paravisor. These pages also will be used by kdump + * kernel. So just reset enable bit here and keep page + * addresses. + */ simp.simp_enabled = 0; - simp.base_simp_gpa = 0; + if (hv_isolation_type_snp()) + memunmap(hv_cpu->synic_message_page); + else + simp.base_simp_gpa = 0; - hv_set_register(HV_REGISTER_SIMP, simp.as_uint64); + hv_set_simp(simp.as_uint64); - siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP); + hv_get_siefp(siefp.as_uint64); siefp.siefp_enabled = 0; - siefp.base_siefp_gpa = 0; - hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64); + if (hv_isolation_type_snp()) + memunmap(hv_cpu->synic_event_page); + else + siefp.base_siefp_gpa = 0; + + hv_set_siefp(siefp.as_uint64); /* Disable the global synic bit */ - sctrl.as_uint64 = hv_get_register(HV_REGISTER_SCONTROL); + hv_get_synic_state(sctrl.as_uint64); sctrl.enable = 0; - hv_set_register(HV_REGISTER_SCONTROL, sctrl.as_uint64); + hv_set_synic_state(sctrl.as_uint64); if (vmbus_irq != -1) disable_percpu_irq(vmbus_irq); diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index aa26d24a5ca9..b0cfc25dffaa 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -23,9 +23,16 @@ #include #include #include +#include +#include #include +#include #include +union hv_ghcb { + struct ghcb ghcb; +} __packed __aligned(PAGE_SIZE); + struct ms_hyperv_info { u32 features; u32 priv_high; @@ -45,7 +52,7 @@ struct ms_hyperv_info { u32 Reserved12 : 20; }; }; - void __percpu **ghcb_base; + union hv_ghcb __percpu **ghcb_base; u64 shared_gpa_boundary; }; extern struct ms_hyperv_info ms_hyperv; @@ -55,6 +62,7 @@ extern void __percpu **hyperv_pcpu_output_arg; extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr); extern u64 hv_do_fast_hypercall8(u16 control, u64 input8); +extern bool hv_isolation_type_snp(void); /* Helper functions that provide a consistent pattern for checking Hyper-V hypercall status. */ static inline int hv_result(u64 status) @@ -149,7 +157,7 @@ static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type) * possibly deliver another msg from the * hypervisor */ - hv_set_register(HV_REGISTER_EOM, 0); + hv_signal_eom(); } } From patchwork Wed Aug 4 18:45:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 492004 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CF3F5C4320A for ; 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Wed, 04 Aug 2021 11:45:41 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:f:1947:6842:b8a8:6f83]) by smtp.gmail.com with ESMTPSA id f5sm3325647pjo.23.2021.08.04.11.45.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Aug 2021 11:45:41 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu.Lan@microsoft.com, rppt@kernel.org, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, martin.b.radev@gmail.com, ardb@kernel.org, rientjes@google.com, tj@kernel.org, keescook@chromium.org, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, parri.andrea@gmail.com Subject: [PATCH V2 07/14] HV: Add ghcb hvcall support for SNP VM Date: Wed, 4 Aug 2021 14:45:03 -0400 Message-Id: <20210804184513.512888-8-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210804184513.512888-1-ltykernel@gmail.com> References: <20210804184513.512888-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan Hyper-V provides ghcb hvcall to handle VMBus HVCALL_SIGNAL_EVENT and HVCALL_POST_MESSAGE msg in SNP Isolation VM. Add such support. Signed-off-by: Tianyu Lan --- arch/x86/hyperv/ivm.c | 43 +++++++++++++++++++++++++++++++++ arch/x86/include/asm/mshyperv.h | 1 + drivers/hv/connection.c | 6 ++++- drivers/hv/hv.c | 8 +++++- include/asm-generic/mshyperv.h | 29 ++++++++++++++++++++++ 5 files changed, 85 insertions(+), 2 deletions(-) diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c index a135020002fe..377729279a0b 100644 --- a/arch/x86/hyperv/ivm.c +++ b/arch/x86/hyperv/ivm.c @@ -15,6 +15,49 @@ #include #include +#define GHCB_USAGE_HYPERV_CALL 1 + +u64 hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size) +{ + union hv_ghcb *hv_ghcb; + void **ghcb_base; + unsigned long flags; + + if (!ms_hyperv.ghcb_base) + return -EFAULT; + + WARN_ON(in_nmi()); + + local_irq_save(flags); + ghcb_base = (void **)this_cpu_ptr(ms_hyperv.ghcb_base); + hv_ghcb = (union hv_ghcb *)*ghcb_base; + if (!hv_ghcb) { + local_irq_restore(flags); + return -EFAULT; + } + + hv_ghcb->ghcb.protocol_version = GHCB_PROTOCOL_MAX; + hv_ghcb->ghcb.ghcb_usage = GHCB_USAGE_HYPERV_CALL; + + hv_ghcb->hypercall.outputgpa = (u64)output; + hv_ghcb->hypercall.hypercallinput.asuint64 = 0; + hv_ghcb->hypercall.hypercallinput.callcode = control; + + if (input_size) + memcpy(hv_ghcb->hypercall.hypercalldata, input, input_size); + + VMGEXIT(); + + hv_ghcb->ghcb.ghcb_usage = 0xffffffff; + memset(hv_ghcb->ghcb.save.valid_bitmap, 0, + sizeof(hv_ghcb->ghcb.save.valid_bitmap)); + + local_irq_restore(flags); + + return hv_ghcb->hypercall.hypercalloutput.callstatus; +} +EXPORT_SYMBOL_GPL(hv_ghcb_hypercall); + void hv_ghcb_msr_write(u64 msr, u64 value) { union hv_ghcb *hv_ghcb; diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 3cccce14ff4c..8f7e2e3b7227 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -255,6 +255,7 @@ void hv_sint_rdmsrl_ghcb(u64 msr, u64 *value); void hv_signal_eom_ghcb(void); void hv_ghcb_msr_write(u64 msr, u64 value); void hv_ghcb_msr_read(u64 msr, u64 *value); +u64 hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size); #define hv_get_synint_state_ghcb(int_num, val) \ hv_sint_rdmsrl_ghcb(HV_X64_MSR_SINT0 + int_num, val) diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c index 5e479d54918c..6d315c1465e0 100644 --- a/drivers/hv/connection.c +++ b/drivers/hv/connection.c @@ -447,6 +447,10 @@ void vmbus_set_event(struct vmbus_channel *channel) ++channel->sig_events; - hv_do_fast_hypercall8(HVCALL_SIGNAL_EVENT, channel->sig_event); + if (hv_isolation_type_snp()) + hv_ghcb_hypercall(HVCALL_SIGNAL_EVENT, &channel->sig_event, + NULL, sizeof(u64)); + else + hv_do_fast_hypercall8(HVCALL_SIGNAL_EVENT, channel->sig_event); } EXPORT_SYMBOL_GPL(vmbus_set_event); diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index 59f7173c4d9f..e5c9fc467893 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -98,7 +98,13 @@ int hv_post_message(union hv_connection_id connection_id, aligned_msg->payload_size = payload_size; memcpy((void *)aligned_msg->payload, payload, payload_size); - status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL); + if (hv_isolation_type_snp()) + status = hv_ghcb_hypercall(HVCALL_POST_MESSAGE, + (void *)aligned_msg, NULL, + sizeof(struct hv_input_post_message)); + else + status = hv_do_hypercall(HVCALL_POST_MESSAGE, + aligned_msg, NULL); /* Preemption must remain disabled until after the hypercall * so some other thread can't get scheduled onto this cpu and diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index b0cfc25dffaa..317d2a8d9700 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -31,6 +31,35 @@ union hv_ghcb { struct ghcb ghcb; + struct { + u64 hypercalldata[509]; + u64 outputgpa; + union { + union { + struct { + u32 callcode : 16; + u32 isfast : 1; + u32 reserved1 : 14; + u32 isnested : 1; + u32 countofelements : 12; + u32 reserved2 : 4; + u32 repstartindex : 12; + u32 reserved3 : 4; + }; + u64 asuint64; + } hypercallinput; + union { + struct { + u16 callstatus; + u16 reserved1; + u32 elementsprocessed : 12; + u32 reserved2 : 20; + }; + u64 asunit64; + } hypercalloutput; + }; + u64 reserved2; + } hypercall; } __packed __aligned(PAGE_SIZE); struct ms_hyperv_info { From patchwork Wed Aug 4 18:45:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 492584 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8AEA1C4320E for ; Wed, 4 Aug 2021 18:46:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7893B60EE9 for ; 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Wed, 04 Aug 2021 11:45:43 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu.Lan@microsoft.com, rppt@kernel.org, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, martin.b.radev@gmail.com, ardb@kernel.org, rientjes@google.com, tj@kernel.org, keescook@chromium.org, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, parri.andrea@gmail.com Subject: [PATCH V2 08/14] HV/Vmbus: Add SNP support for VMbus channel initiate message Date: Wed, 4 Aug 2021 14:45:04 -0400 Message-Id: <20210804184513.512888-9-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210804184513.512888-1-ltykernel@gmail.com> References: <20210804184513.512888-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan The monitor pages in the CHANNELMSG_INITIATE_CONTACT msg are shared with host in Isolation VM and so it's necessary to use hvcall to set them visible to host. In Isolation VM with AMD SEV SNP, the access address should be in the extra space which is above shared gpa boundary. So remap these pages into the extra address(pa + shared_gpa_boundary). Introduce monitor_pages_va to store the remap address and unmap these va when disconnect vmbus. Signed-off-by: Tianyu Lan --- Change since v1: * Not remap monitor pages in the non-SNP isolation VM. --- drivers/hv/connection.c | 65 +++++++++++++++++++++++++++++++++++++++ drivers/hv/hyperv_vmbus.h | 1 + 2 files changed, 66 insertions(+) diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c index 6d315c1465e0..bf0ac3167bd2 100644 --- a/drivers/hv/connection.c +++ b/drivers/hv/connection.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include "hyperv_vmbus.h" @@ -104,6 +105,12 @@ int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version) msg->monitor_page1 = virt_to_phys(vmbus_connection.monitor_pages[0]); msg->monitor_page2 = virt_to_phys(vmbus_connection.monitor_pages[1]); + + if (hv_isolation_type_snp()) { + msg->monitor_page1 += ms_hyperv.shared_gpa_boundary; + msg->monitor_page2 += ms_hyperv.shared_gpa_boundary; + } + msg->target_vcpu = hv_cpu_number_to_vp_number(VMBUS_CONNECT_CPU); /* @@ -148,6 +155,31 @@ int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version) return -ECONNREFUSED; } + if (hv_isolation_type_snp()) { + vmbus_connection.monitor_pages_va[0] + = vmbus_connection.monitor_pages[0]; + vmbus_connection.monitor_pages[0] + = memremap(msg->monitor_page1, HV_HYP_PAGE_SIZE, + MEMREMAP_WB); + if (!vmbus_connection.monitor_pages[0]) + return -ENOMEM; + + vmbus_connection.monitor_pages_va[1] + = vmbus_connection.monitor_pages[1]; + vmbus_connection.monitor_pages[1] + = memremap(msg->monitor_page2, HV_HYP_PAGE_SIZE, + MEMREMAP_WB); + if (!vmbus_connection.monitor_pages[1]) { + memunmap(vmbus_connection.monitor_pages[0]); + return -ENOMEM; + } + + memset(vmbus_connection.monitor_pages[0], 0x00, + HV_HYP_PAGE_SIZE); + memset(vmbus_connection.monitor_pages[1], 0x00, + HV_HYP_PAGE_SIZE); + } + return ret; } @@ -159,6 +191,7 @@ int vmbus_connect(void) struct vmbus_channel_msginfo *msginfo = NULL; int i, ret = 0; __u32 version; + u64 pfn[2]; /* Initialize the vmbus connection */ vmbus_connection.conn_state = CONNECTING; @@ -216,6 +249,16 @@ int vmbus_connect(void) goto cleanup; } + if (hv_is_isolation_supported()) { + pfn[0] = virt_to_hvpfn(vmbus_connection.monitor_pages[0]); + pfn[1] = virt_to_hvpfn(vmbus_connection.monitor_pages[1]); + if (hv_mark_gpa_visibility(2, pfn, + VMBUS_PAGE_VISIBLE_READ_WRITE)) { + ret = -EFAULT; + goto cleanup; + } + } + msginfo = kzalloc(sizeof(*msginfo) + sizeof(struct vmbus_channel_initiate_contact), GFP_KERNEL); @@ -284,6 +327,8 @@ int vmbus_connect(void) void vmbus_disconnect(void) { + u64 pfn[2]; + /* * First send the unload request to the host. */ @@ -303,6 +348,26 @@ void vmbus_disconnect(void) vmbus_connection.int_page = NULL; } + if (hv_is_isolation_supported()) { + if (vmbus_connection.monitor_pages_va[0]) { + memunmap(vmbus_connection.monitor_pages[0]); + vmbus_connection.monitor_pages[0] + = vmbus_connection.monitor_pages_va[0]; + vmbus_connection.monitor_pages_va[0] = NULL; + } + + if (vmbus_connection.monitor_pages_va[1]) { + memunmap(vmbus_connection.monitor_pages[1]); + vmbus_connection.monitor_pages[1] + = vmbus_connection.monitor_pages_va[1]; + vmbus_connection.monitor_pages_va[1] = NULL; + } + + pfn[0] = virt_to_hvpfn(vmbus_connection.monitor_pages[0]); + pfn[1] = virt_to_hvpfn(vmbus_connection.monitor_pages[1]); + hv_mark_gpa_visibility(2, pfn, VMBUS_PAGE_NOT_VISIBLE); + } + hv_free_hyperv_page((unsigned long)vmbus_connection.monitor_pages[0]); hv_free_hyperv_page((unsigned long)vmbus_connection.monitor_pages[1]); vmbus_connection.monitor_pages[0] = NULL; diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h index 42f3d9d123a1..40bc0eff6665 100644 --- a/drivers/hv/hyperv_vmbus.h +++ b/drivers/hv/hyperv_vmbus.h @@ -240,6 +240,7 @@ struct vmbus_connection { * is child->parent notification */ struct hv_monitor_page *monitor_pages[2]; + void *monitor_pages_va[2]; struct list_head chn_msg_list; spinlock_t channelmsg_lock; From patchwork Wed Aug 4 18:45:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 492003 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8B6B8C04FE3 for ; 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Wed, 04 Aug 2021 11:45:46 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:f:1947:6842:b8a8:6f83]) by smtp.gmail.com with ESMTPSA id f5sm3325647pjo.23.2021.08.04.11.45.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Aug 2021 11:45:46 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu.Lan@microsoft.com, rppt@kernel.org, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, martin.b.radev@gmail.com, ardb@kernel.org, rientjes@google.com, tj@kernel.org, keescook@chromium.org, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, parri.andrea@gmail.com Subject: [PATCH V2 09/14] HV/Vmbus: Initialize VMbus ring buffer for Isolation VM Date: Wed, 4 Aug 2021 14:45:05 -0400 Message-Id: <20210804184513.512888-10-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210804184513.512888-1-ltykernel@gmail.com> References: <20210804184513.512888-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan VMbus ring buffer are shared with host and it's need to be accessed via extra address space of Isolation VM with SNP support. This patch is to map the ring buffer address in extra address space via ioremap(). HV host visibility hvcall smears data in the ring buffer and so reset the ring buffer memory to zero after calling visibility hvcall. Signed-off-by: Tianyu Lan --- drivers/hv/Kconfig | 1 + drivers/hv/channel.c | 10 +++++ drivers/hv/hyperv_vmbus.h | 2 + drivers/hv/ring_buffer.c | 84 ++++++++++++++++++++++++++++++--------- 4 files changed, 79 insertions(+), 18 deletions(-) diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig index 66c794d92391..a8386998be40 100644 --- a/drivers/hv/Kconfig +++ b/drivers/hv/Kconfig @@ -7,6 +7,7 @@ config HYPERV depends on X86 && ACPI && X86_LOCAL_APIC && HYPERVISOR_GUEST select PARAVIRT select X86_HV_CALLBACK_VECTOR + select VMAP_PFN help Select this option to run Linux as a Hyper-V client operating system. diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c index 4c4717c26240..60ef881a700c 100644 --- a/drivers/hv/channel.c +++ b/drivers/hv/channel.c @@ -712,6 +712,16 @@ static int __vmbus_open(struct vmbus_channel *newchannel, if (err) goto error_clean_ring; + err = hv_ringbuffer_post_init(&newchannel->outbound, + page, send_pages); + if (err) + goto error_free_gpadl; + + err = hv_ringbuffer_post_init(&newchannel->inbound, + &page[send_pages], recv_pages); + if (err) + goto error_free_gpadl; + /* Create and init the channel open message */ open_info = kzalloc(sizeof(*open_info) + sizeof(struct vmbus_channel_open_channel), diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h index 40bc0eff6665..15cd23a561f3 100644 --- a/drivers/hv/hyperv_vmbus.h +++ b/drivers/hv/hyperv_vmbus.h @@ -172,6 +172,8 @@ extern int hv_synic_cleanup(unsigned int cpu); /* Interface */ void hv_ringbuffer_pre_init(struct vmbus_channel *channel); +int hv_ringbuffer_post_init(struct hv_ring_buffer_info *ring_info, + struct page *pages, u32 page_cnt); int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, struct page *pages, u32 pagecnt, u32 max_pkt_size); diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c index 2aee356840a2..d4f93fca1108 100644 --- a/drivers/hv/ring_buffer.c +++ b/drivers/hv/ring_buffer.c @@ -17,6 +17,8 @@ #include #include #include +#include +#include #include "hyperv_vmbus.h" @@ -179,43 +181,89 @@ void hv_ringbuffer_pre_init(struct vmbus_channel *channel) mutex_init(&channel->outbound.ring_buffer_mutex); } -/* Initialize the ring buffer. */ -int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, - struct page *pages, u32 page_cnt, u32 max_pkt_size) +int hv_ringbuffer_post_init(struct hv_ring_buffer_info *ring_info, + struct page *pages, u32 page_cnt) { + u64 physic_addr = page_to_pfn(pages) << PAGE_SHIFT; + unsigned long *pfns_wraparound; + void *vaddr; int i; - struct page **pages_wraparound; - BUILD_BUG_ON((sizeof(struct hv_ring_buffer) != PAGE_SIZE)); + if (!hv_isolation_type_snp()) + return 0; + + physic_addr += ms_hyperv.shared_gpa_boundary; /* * First page holds struct hv_ring_buffer, do wraparound mapping for * the rest. */ - pages_wraparound = kcalloc(page_cnt * 2 - 1, sizeof(struct page *), + pfns_wraparound = kcalloc(page_cnt * 2 - 1, sizeof(unsigned long), GFP_KERNEL); - if (!pages_wraparound) + if (!pfns_wraparound) return -ENOMEM; - pages_wraparound[0] = pages; + pfns_wraparound[0] = physic_addr >> PAGE_SHIFT; for (i = 0; i < 2 * (page_cnt - 1); i++) - pages_wraparound[i + 1] = &pages[i % (page_cnt - 1) + 1]; - - ring_info->ring_buffer = (struct hv_ring_buffer *) - vmap(pages_wraparound, page_cnt * 2 - 1, VM_MAP, PAGE_KERNEL); - - kfree(pages_wraparound); + pfns_wraparound[i + 1] = (physic_addr >> PAGE_SHIFT) + + i % (page_cnt - 1) + 1; - - if (!ring_info->ring_buffer) + vaddr = vmap_pfn(pfns_wraparound, page_cnt * 2 - 1, PAGE_KERNEL_IO); + kfree(pfns_wraparound); + if (!vaddr) return -ENOMEM; - ring_info->ring_buffer->read_index = - ring_info->ring_buffer->write_index = 0; + /* Clean memory after setting host visibility. */ + memset((void *)vaddr, 0x00, page_cnt * PAGE_SIZE); + + ring_info->ring_buffer = (struct hv_ring_buffer *)vaddr; + ring_info->ring_buffer->read_index = 0; + ring_info->ring_buffer->write_index = 0; /* Set the feature bit for enabling flow control. */ ring_info->ring_buffer->feature_bits.value = 1; + return 0; +} + +/* Initialize the ring buffer. */ +int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, + struct page *pages, u32 page_cnt, u32 max_pkt_size) +{ + int i; + struct page **pages_wraparound; + + BUILD_BUG_ON((sizeof(struct hv_ring_buffer) != PAGE_SIZE)); + + if (!hv_isolation_type_snp()) { + /* + * First page holds struct hv_ring_buffer, do wraparound mapping for + * the rest. + */ + pages_wraparound = kcalloc(page_cnt * 2 - 1, sizeof(struct page *), + GFP_KERNEL); + if (!pages_wraparound) + return -ENOMEM; + + pages_wraparound[0] = pages; + for (i = 0; i < 2 * (page_cnt - 1); i++) + pages_wraparound[i + 1] = &pages[i % (page_cnt - 1) + 1]; + + ring_info->ring_buffer = (struct hv_ring_buffer *) + vmap(pages_wraparound, page_cnt * 2 - 1, VM_MAP, PAGE_KERNEL); + + kfree(pages_wraparound); + + if (!ring_info->ring_buffer) + return -ENOMEM; + + ring_info->ring_buffer->read_index = + ring_info->ring_buffer->write_index = 0; + + /* Set the feature bit for enabling flow control. */ + ring_info->ring_buffer->feature_bits.value = 1; + } + ring_info->ring_size = page_cnt << PAGE_SHIFT; ring_info->ring_size_div10_reciprocal = reciprocal_value(ring_info->ring_size / 10); 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Wed, 04 Aug 2021 11:45:48 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu.Lan@microsoft.com, rppt@kernel.org, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, martin.b.radev@gmail.com, ardb@kernel.org, rientjes@google.com, tj@kernel.org, keescook@chromium.org, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, parri.andrea@gmail.com Subject: [PATCH V2 10/14] DMA: Add dma_map_decrypted/dma_unmap_encrypted() function Date: Wed, 4 Aug 2021 14:45:06 -0400 Message-Id: <20210804184513.512888-11-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210804184513.512888-1-ltykernel@gmail.com> References: <20210804184513.512888-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan In Hyper-V Isolation VM with AMD SEV, swiotlb boucne buffer needs to be mapped into address space above vTOM and so introduce dma_map_decrypted/dma_unmap_encrypted() to map/unmap bounce buffer memory. The platform can populate man/unmap callback in the dma memory decrypted ops. Signed-off-by: Tianyu Lan --- include/linux/dma-map-ops.h | 9 +++++++++ kernel/dma/mapping.c | 22 ++++++++++++++++++++++ 2 files changed, 31 insertions(+) diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 0d53a96a3d64..01d60a024e45 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -71,6 +71,11 @@ struct dma_map_ops { unsigned long (*get_merge_boundary)(struct device *dev); }; +struct dma_memory_decrypted_ops { + void *(*map)(void *addr, unsigned long size); + void (*unmap)(void *addr); +}; + #ifdef CONFIG_DMA_OPS #include @@ -374,6 +379,10 @@ static inline void debug_dma_dump_mappings(struct device *dev) } #endif /* CONFIG_DMA_API_DEBUG */ +void *dma_map_decrypted(void *addr, unsigned long size); +int dma_unmap_decrypted(void *addr, unsigned long size); + extern const struct dma_map_ops dma_dummy_ops; +extern struct dma_memory_decrypted_ops dma_memory_generic_decrypted_ops; #endif /* _LINUX_DMA_MAP_OPS_H */ diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index 2b06a809d0b9..6fb150dc1750 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -13,11 +13,13 @@ #include #include #include +#include #include "debug.h" #include "direct.h" bool dma_default_coherent; +struct dma_memory_decrypted_ops dma_memory_generic_decrypted_ops; /* * Managed DMA API */ @@ -736,3 +738,23 @@ unsigned long dma_get_merge_boundary(struct device *dev) return ops->get_merge_boundary(dev); } EXPORT_SYMBOL_GPL(dma_get_merge_boundary); + +void *dma_map_decrypted(void *addr, unsigned long size) +{ + if (set_memory_decrypted((unsigned long)addr, + size / PAGE_SIZE)) + return NULL; + + if (dma_memory_generic_decrypted_ops.map) + return dma_memory_generic_decrypted_ops.map(addr, size); + else + return addr; +} + +int dma_unmap_encrypted(void *addr, unsigned long size) +{ + if (dma_memory_generic_decrypted_ops.unmap) + dma_memory_generic_decrypted_ops.unmap(addr); + + return set_memory_encrypted((unsigned long)addr, size / PAGE_SIZE); +} From patchwork Wed Aug 4 18:45:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 492002 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C085EC4320A for ; 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Wed, 04 Aug 2021 11:45:51 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:f:1947:6842:b8a8:6f83]) by smtp.gmail.com with ESMTPSA id f5sm3325647pjo.23.2021.08.04.11.45.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Aug 2021 11:45:50 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu.Lan@microsoft.com, rppt@kernel.org, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, martin.b.radev@gmail.com, ardb@kernel.org, rientjes@google.com, tj@kernel.org, keescook@chromium.org, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, parri.andrea@gmail.com Subject: [PATCH V2 11/14] x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM Date: Wed, 4 Aug 2021 14:45:07 -0400 Message-Id: <20210804184513.512888-12-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210804184513.512888-1-ltykernel@gmail.com> References: <20210804184513.512888-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan In Isolation VM with AMD SEV, bounce buffer needs to be accessed via extra address space which is above shared_gpa_boundary (E.G 39 bit address line) reported by Hyper-V CPUID ISOLATION_CONFIG. The access physical address will be original physical address + shared_gpa_boundary. The shared_gpa_boundary in the AMD SEV SNP spec is called virtual top of memory(vTOM). Memory addresses below vTOM are automatically treated as private while memory above vTOM is treated as shared. Use dma_map_decrypted() in the swiotlb code, store remap address returned and use the remap address to copy data from/to swiotlb bounce buffer. Signed-off-by: Tianyu Lan --- Change since v1: * Make swiotlb_init_io_tlb_mem() return error code and return error when dma_map_decrypted() fails. Signed-off-by: Tianyu Lan --- include/linux/swiotlb.h | 4 ++++ kernel/dma/swiotlb.c | 32 ++++++++++++++++++++++++-------- 2 files changed, 28 insertions(+), 8 deletions(-) diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index f507e3eacbea..584560ecaa8e 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -72,6 +72,9 @@ extern enum swiotlb_force swiotlb_force; * @end: The end address of the swiotlb memory pool. Used to do a quick * range check to see if the memory was in fact allocated by this * API. + * @vaddr: The vaddr of the swiotlb memory pool. The swiotlb + * memory pool may be remapped in the memory encrypted case and store + * virtual address for bounce buffer operation. * @nslabs: The number of IO TLB blocks (in groups of 64) between @start and * @end. For default swiotlb, this is command line adjustable via * setup_io_tlb_npages. @@ -89,6 +92,7 @@ extern enum swiotlb_force swiotlb_force; struct io_tlb_mem { phys_addr_t start; phys_addr_t end; + void *vaddr; unsigned long nslabs; unsigned long used; unsigned int index; diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 1fa81c096c1d..29b6d888ef3b 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -176,7 +176,7 @@ void __init swiotlb_update_mem_attributes(void) memset(vaddr, 0, bytes); } -static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start, +static int swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start, unsigned long nslabs, bool late_alloc) { void *vaddr = phys_to_virt(start); @@ -194,14 +194,21 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start, mem->slots[i].alloc_size = 0; } - set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT); - memset(vaddr, 0, bytes); + mem->vaddr = dma_map_decrypted(vaddr, bytes); + if (!mem->vaddr) { + pr_err("Failed to decrypt memory.\n"); + return -ENOMEM; + } + + memset(mem->vaddr, 0, bytes); + return 0; } int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose) { struct io_tlb_mem *mem; size_t alloc_size; + int ret; if (swiotlb_force == SWIOTLB_NO_FORCE) return 0; @@ -216,7 +223,11 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose) panic("%s: Failed to allocate %zu bytes align=0x%lx\n", __func__, alloc_size, PAGE_SIZE); - swiotlb_init_io_tlb_mem(mem, __pa(tlb), nslabs, false); + ret = swiotlb_init_io_tlb_mem(mem, __pa(tlb), nslabs, false); + if (ret) { + memblock_free(__pa(mem), alloc_size); + return ret; + } io_tlb_default_mem = mem; if (verbose) @@ -304,6 +315,8 @@ int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs) { struct io_tlb_mem *mem; + int size = get_order(struct_size(mem, slots, nslabs)); + int ret; if (swiotlb_force == SWIOTLB_NO_FORCE) return 0; @@ -312,12 +325,15 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs) if (WARN_ON_ONCE(io_tlb_default_mem)) return -ENOMEM; - mem = (void *)__get_free_pages(GFP_KERNEL, - get_order(struct_size(mem, slots, nslabs))); + mem = (void *)__get_free_pages(GFP_KERNEL, size); if (!mem) return -ENOMEM; - swiotlb_init_io_tlb_mem(mem, virt_to_phys(tlb), nslabs, true); + ret = swiotlb_init_io_tlb_mem(mem, virt_to_phys(tlb), nslabs, true); + if (ret) { + free_pages((unsigned long)mem, size); + return ret; + } io_tlb_default_mem = mem; swiotlb_print_info(); @@ -360,7 +376,7 @@ static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size phys_addr_t orig_addr = mem->slots[index].orig_addr; size_t alloc_size = mem->slots[index].alloc_size; unsigned long pfn = PFN_DOWN(orig_addr); - unsigned char *vaddr = phys_to_virt(tlb_addr); + unsigned char *vaddr = mem->vaddr + tlb_addr - mem->start; unsigned int tlb_offset; if (orig_addr == INVALID_PHYS_ADDR) From patchwork Wed Aug 4 18:45:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 492583 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CE045C4338F for ; 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Wed, 04 Aug 2021 11:45:53 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:f:1947:6842:b8a8:6f83]) by smtp.gmail.com with ESMTPSA id f5sm3325647pjo.23.2021.08.04.11.45.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Aug 2021 11:45:53 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu.Lan@microsoft.com, rppt@kernel.org, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, martin.b.radev@gmail.com, ardb@kernel.org, rientjes@google.com, tj@kernel.org, keescook@chromium.org, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, parri.andrea@gmail.com Subject: [PATCH V2 12/14] HV/IOMMU: Enable swiotlb bounce buffer for Isolation VM Date: Wed, 4 Aug 2021 14:45:08 -0400 Message-Id: <20210804184513.512888-13-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210804184513.512888-1-ltykernel@gmail.com> References: <20210804184513.512888-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan Hyper-V Isolation VM requires bounce buffer support to copy data from/to encrypted memory and so enable swiotlb force mode to use swiotlb bounce buffer for DMA transaction. In Isolation VM with AMD SEV, the bounce buffer needs to be accessed via extra address space which is above shared_gpa_boundary (E.G 39 bit address line) reported by Hyper-V CPUID ISOLATION_CONFIG. The access physical address will be original physical address + shared_gpa_boundary. The shared_gpa_boundary in the AMD SEV SNP spec is called virtual top of memory(vTOM). Memory addresses below vTOM are automatically treated as private while memory above vTOM is treated as shared. Swiotlb bounce buffer code calls dma_map_decrypted() to mark bounce buffer visible to host and map it in extra address space. Populate dma memory decrypted ops with hv map/unmap function. Hyper-V initalizes swiotlb bounce buffer and default swiotlb needs to be disabled. pci_swiotlb_detect_override() and pci_swiotlb_detect_4gb() enable the default one. To override the setting, hyperv_swiotlb_detect() needs to run before these detect functions which depends on the pci_xen_swiotlb_ init(). Make pci_xen_swiotlb_init() depends on the hyperv_swiotlb _detect() to keep the order. The map function vmap_pfn() can't work in the early place hyperv_iommu_swiotlb_init() and so initialize swiotlb bounce buffer in the hyperv_iommu_swiotlb_later_init(). Signed-off-by: Tianyu Lan --- arch/x86/hyperv/ivm.c | 28 ++++++++++++++ arch/x86/include/asm/mshyperv.h | 2 + arch/x86/xen/pci-swiotlb-xen.c | 3 +- drivers/hv/vmbus_drv.c | 3 ++ drivers/iommu/hyperv-iommu.c | 65 +++++++++++++++++++++++++++++++++ include/linux/hyperv.h | 1 + 6 files changed, 101 insertions(+), 1 deletion(-) diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c index 377729279a0b..d2aa3120b005 100644 --- a/arch/x86/hyperv/ivm.c +++ b/arch/x86/hyperv/ivm.c @@ -265,3 +265,31 @@ int hv_set_mem_enc(unsigned long addr, int numpages, bool enc) return hv_set_mem_host_visibility((void *)addr, numpages, visibility); } + +/* + * hv_map_memory - map memory to extra space in the AMD SEV-SNP Isolation VM. + */ +void *hv_map_memory(void *addr, unsigned long size) +{ + unsigned long *pfns = kcalloc(size / HV_HYP_PAGE_SIZE, + sizeof(unsigned long), GFP_KERNEL); + void *vaddr; + int i; + + if (!pfns) + return NULL; + + for (i = 0; i < size / HV_HYP_PAGE_SIZE; i++) + pfns[i] = virt_to_hvpfn(addr + i * HV_HYP_PAGE_SIZE) + + (ms_hyperv.shared_gpa_boundary >> HV_HYP_PAGE_SHIFT); + + vaddr = vmap_pfn(pfns, size / HV_HYP_PAGE_SIZE, PAGE_KERNEL_IO); + kfree(pfns); + + return vaddr; +} + +void hv_unmap_memory(void *addr) +{ + vunmap(addr); +} diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 8f7e2e3b7227..bd7b3ce1ae59 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -250,6 +250,8 @@ int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry); int hv_mark_gpa_visibility(u16 count, const u64 pfn[], enum hv_mem_host_visibility visibility); int hv_set_mem_enc(unsigned long addr, int numpages, bool enc); +void *hv_map_memory(void *addr, unsigned long size); +void hv_unmap_memory(void *addr); void hv_sint_wrmsrl_ghcb(u64 msr, u64 value); void hv_sint_rdmsrl_ghcb(u64 msr, u64 *value); void hv_signal_eom_ghcb(void); diff --git a/arch/x86/xen/pci-swiotlb-xen.c b/arch/x86/xen/pci-swiotlb-xen.c index 54f9aa7e8457..43bd031aa332 100644 --- a/arch/x86/xen/pci-swiotlb-xen.c +++ b/arch/x86/xen/pci-swiotlb-xen.c @@ -4,6 +4,7 @@ #include #include +#include #include #include @@ -91,6 +92,6 @@ int pci_xen_swiotlb_init_late(void) EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late); IOMMU_INIT_FINISH(pci_xen_swiotlb_detect, - NULL, + hyperv_swiotlb_detect, pci_xen_swiotlb_init, NULL); diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 57bbbaa4e8f7..f068e22a5636 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -23,6 +23,7 @@ #include #include +#include #include #include #include @@ -2081,6 +2082,7 @@ struct hv_device *vmbus_device_create(const guid_t *type, return child_device_obj; } +static u64 vmbus_dma_mask = DMA_BIT_MASK(64); /* * vmbus_device_register - Register the child device */ @@ -2121,6 +2123,7 @@ int vmbus_device_register(struct hv_device *child_device_obj) } hv_debug_add_dev_dir(child_device_obj); + child_device_obj->device.dma_mask = &vmbus_dma_mask; return 0; err_kset_unregister: diff --git a/drivers/iommu/hyperv-iommu.c b/drivers/iommu/hyperv-iommu.c index e285a220c913..01e874b3b43a 100644 --- a/drivers/iommu/hyperv-iommu.c +++ b/drivers/iommu/hyperv-iommu.c @@ -13,14 +13,22 @@ #include #include #include +#include +#include #include #include #include #include +#include +#include #include #include #include +#include +#include +#include +#include #include "irq_remapping.h" @@ -36,6 +44,9 @@ static cpumask_t ioapic_max_cpumask = { CPU_BITS_NONE }; static struct irq_domain *ioapic_ir_domain; +static unsigned long hyperv_io_tlb_size; +static void *hyperv_io_tlb_start; + static int hyperv_ir_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force) { @@ -337,4 +348,58 @@ static const struct irq_domain_ops hyperv_root_ir_domain_ops = { .free = hyperv_root_irq_remapping_free, }; +void __init hyperv_iommu_swiotlb_init(void) +{ + unsigned long bytes; + + /* + * Allocate Hyper-V swiotlb bounce buffer at early place + * to reserve large contiguous memory. + */ + hyperv_io_tlb_size = 256 * 1024 * 1024; + hyperv_io_tlb_start = + memblock_alloc_low( + PAGE_ALIGN(hyperv_io_tlb_size), + HV_HYP_PAGE_SIZE); + + if (!hyperv_io_tlb_start) { + pr_warn("Fail to allocate Hyper-V swiotlb buffer.\n"); + return; + } +} + +int __init hyperv_swiotlb_detect(void) +{ + if (hypervisor_is_type(X86_HYPER_MS_HYPERV) + && hv_is_isolation_supported()) { + /* + * Enable swiotlb force mode in Isolation VM to + * use swiotlb bounce buffer for dma transaction. + */ + swiotlb_force = SWIOTLB_FORCE; + + dma_memory_generic_decrypted_ops.map = hv_map_memory; + dma_memory_generic_decrypted_ops.unmap = hv_unmap_memory; + return 1; + } + + return 0; +} + +void __init hyperv_iommu_swiotlb_later_init(void) +{ + /* + * Swiotlb bounce buffer needs to be mapped in extra address + * space. Map function doesn't work in the early place and so + * call swiotlb_late_init_with_tbl() here. + */ + if (swiotlb_late_init_with_tbl(hyperv_io_tlb_start, + hyperv_io_tlb_size >> IO_TLB_SHIFT)) + panic("Fail to initialize hyperv swiotlb.\n"); +} + +IOMMU_INIT_FINISH(hyperv_swiotlb_detect, + NULL, hyperv_iommu_swiotlb_init, + hyperv_iommu_swiotlb_later_init); + #endif diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index cbe376b82de3..cb4695c893a6 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -1760,6 +1760,7 @@ int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len, int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context, void (*block_invalidate)(void *context, u64 block_mask)); +int __init hyperv_swiotlb_detect(void); struct hyperv_pci_block_ops { int (*read_block)(struct pci_dev *dev, void *buf, unsigned int buf_len, From patchwork Wed Aug 4 18:45:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 492582 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1DFD1C43216 for ; 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Wed, 04 Aug 2021 11:45:55 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:f:1947:6842:b8a8:6f83]) by smtp.gmail.com with ESMTPSA id f5sm3325647pjo.23.2021.08.04.11.45.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Aug 2021 11:45:55 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu.Lan@microsoft.com, rppt@kernel.org, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, martin.b.radev@gmail.com, ardb@kernel.org, rientjes@google.com, tj@kernel.org, keescook@chromium.org, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, parri.andrea@gmail.com Subject: [PATCH V2 13/14] HV/Netvsc: Add Isolation VM support for netvsc driver Date: Wed, 4 Aug 2021 14:45:09 -0400 Message-Id: <20210804184513.512888-14-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210804184513.512888-1-ltykernel@gmail.com> References: <20210804184513.512888-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan In Isolation VM, all shared memory with host needs to mark visible to host via hvcall. vmbus_establish_gpadl() has already done it for netvsc rx/tx ring buffer. The page buffer used by vmbus_sendpacket_ pagebuffer() still need to handle. Use DMA API to map/umap these memory during sending/receiving packet and Hyper-V DMA ops callback will use swiotlb function to allocate bounce buffer and copy data from/to bounce buffer. Signed-off-by: Tianyu Lan --- drivers/net/hyperv/hyperv_net.h | 6 ++ drivers/net/hyperv/netvsc.c | 144 +++++++++++++++++++++++++++++- drivers/net/hyperv/rndis_filter.c | 2 + include/linux/hyperv.h | 5 ++ 4 files changed, 154 insertions(+), 3 deletions(-) diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h index bc48855dff10..862419912bfb 100644 --- a/drivers/net/hyperv/hyperv_net.h +++ b/drivers/net/hyperv/hyperv_net.h @@ -164,6 +164,7 @@ struct hv_netvsc_packet { u32 total_bytes; u32 send_buf_index; u32 total_data_buflen; + struct hv_dma_range *dma_range; }; #define NETVSC_HASH_KEYLEN 40 @@ -1074,6 +1075,7 @@ struct netvsc_device { /* Receive buffer allocated by us but manages by NetVSP */ void *recv_buf; + void *recv_original_buf; u32 recv_buf_size; /* allocated bytes */ u32 recv_buf_gpadl_handle; u32 recv_section_cnt; @@ -1082,6 +1084,8 @@ struct netvsc_device { /* Send buffer allocated by us */ void *send_buf; + void *send_original_buf; + u32 send_buf_size; u32 send_buf_gpadl_handle; u32 send_section_cnt; u32 send_section_size; @@ -1730,4 +1734,6 @@ struct rndis_message { #define RETRY_US_HI 10000 #define RETRY_MAX 2000 /* >10 sec */ +void netvsc_dma_unmap(struct hv_device *hv_dev, + struct hv_netvsc_packet *packet); #endif /* _HYPERV_NET_H */ diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index 7bd935412853..fc312e5db4d5 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -153,8 +153,21 @@ static void free_netvsc_device(struct rcu_head *head) int i; kfree(nvdev->extension); - vfree(nvdev->recv_buf); - vfree(nvdev->send_buf); + + if (nvdev->recv_original_buf) { + vunmap(nvdev->recv_buf); + vfree(nvdev->recv_original_buf); + } else { + vfree(nvdev->recv_buf); + } + + if (nvdev->send_original_buf) { + vunmap(nvdev->send_buf); + vfree(nvdev->send_original_buf); + } else { + vfree(nvdev->send_buf); + } + kfree(nvdev->send_section_map); for (i = 0; i < VRSS_CHANNEL_MAX; i++) { @@ -330,6 +343,27 @@ int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx) return nvchan->mrc.slots ? 0 : -ENOMEM; } +static void *netvsc_remap_buf(void *buf, unsigned long size) +{ + unsigned long *pfns; + void *vaddr; + int i; + + pfns = kcalloc(size / HV_HYP_PAGE_SIZE, sizeof(unsigned long), + GFP_KERNEL); + if (!pfns) + return NULL; + + for (i = 0; i < size / HV_HYP_PAGE_SIZE; i++) + pfns[i] = virt_to_hvpfn(buf + i * HV_HYP_PAGE_SIZE) + + (ms_hyperv.shared_gpa_boundary >> HV_HYP_PAGE_SHIFT); + + vaddr = vmap_pfn(pfns, size / HV_HYP_PAGE_SIZE, PAGE_KERNEL_IO); + kfree(pfns); + + return vaddr; +} + static int netvsc_init_buf(struct hv_device *device, struct netvsc_device *net_device, const struct netvsc_device_info *device_info) @@ -340,6 +374,7 @@ static int netvsc_init_buf(struct hv_device *device, unsigned int buf_size; size_t map_words; int i, ret = 0; + void *vaddr; /* Get receive buffer area. */ buf_size = device_info->recv_sections * device_info->recv_section_size; @@ -375,6 +410,15 @@ static int netvsc_init_buf(struct hv_device *device, goto cleanup; } + if (hv_isolation_type_snp()) { + vaddr = netvsc_remap_buf(net_device->recv_buf, buf_size); + if (!vaddr) + goto cleanup; + + net_device->recv_original_buf = net_device->recv_buf; + net_device->recv_buf = vaddr; + } + /* Notify the NetVsp of the gpadl handle */ init_packet = &net_device->channel_init_pkt; memset(init_packet, 0, sizeof(struct nvsp_message)); @@ -477,6 +521,15 @@ static int netvsc_init_buf(struct hv_device *device, goto cleanup; } + if (hv_isolation_type_snp()) { + vaddr = netvsc_remap_buf(net_device->send_buf, buf_size); + if (!vaddr) + goto cleanup; + + net_device->send_original_buf = net_device->send_buf; + net_device->send_buf = vaddr; + } + /* Notify the NetVsp of the gpadl handle */ init_packet = &net_device->channel_init_pkt; memset(init_packet, 0, sizeof(struct nvsp_message)); @@ -767,7 +820,7 @@ static void netvsc_send_tx_complete(struct net_device *ndev, /* Notify the layer above us */ if (likely(skb)) { - const struct hv_netvsc_packet *packet + struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)skb->cb; u32 send_index = packet->send_buf_index; struct netvsc_stats *tx_stats; @@ -783,6 +836,7 @@ static void netvsc_send_tx_complete(struct net_device *ndev, tx_stats->bytes += packet->total_bytes; u64_stats_update_end(&tx_stats->syncp); + netvsc_dma_unmap(ndev_ctx->device_ctx, packet); napi_consume_skb(skb, budget); } @@ -947,6 +1001,82 @@ static void netvsc_copy_to_send_buf(struct netvsc_device *net_device, memset(dest, 0, padding); } +void netvsc_dma_unmap(struct hv_device *hv_dev, + struct hv_netvsc_packet *packet) +{ + u32 page_count = packet->cp_partial ? + packet->page_buf_cnt - packet->rmsg_pgcnt : + packet->page_buf_cnt; + int i; + + if (!hv_is_isolation_supported()) + return; + + if (!packet->dma_range) + return; + + for (i = 0; i < page_count; i++) + dma_unmap_single(&hv_dev->device, packet->dma_range[i].dma, + packet->dma_range[i].mapping_size, + DMA_TO_DEVICE); + + kfree(packet->dma_range); +} + +/* netvsc_dma_map - Map swiotlb bounce buffer with data page of + * packet sent by vmbus_sendpacket_pagebuffer() in the Isolation + * VM. + * + * In isolation VM, netvsc send buffer has been marked visible to + * host and so the data copied to send buffer doesn't need to use + * bounce buffer. The data pages handled by vmbus_sendpacket_pagebuffer() + * may not be copied to send buffer and so these pages need to be + * mapped with swiotlb bounce buffer. netvsc_dma_map() is to do + * that. The pfns in the struct hv_page_buffer need to be converted + * to bounce buffer's pfn. The loop here is necessary and so not + * use dma_map_sg() here. + */ +int netvsc_dma_map(struct hv_device *hv_dev, + struct hv_netvsc_packet *packet, + struct hv_page_buffer *pb) +{ + u32 page_count = packet->cp_partial ? + packet->page_buf_cnt - packet->rmsg_pgcnt : + packet->page_buf_cnt; + dma_addr_t dma; + int i; + + if (!hv_is_isolation_supported()) + return 0; + + packet->dma_range = kcalloc(page_count, + sizeof(*packet->dma_range), + GFP_KERNEL); + if (!packet->dma_range) + return -ENOMEM; + + for (i = 0; i < page_count; i++) { + char *src = phys_to_virt((pb[i].pfn << HV_HYP_PAGE_SHIFT) + + pb[i].offset); + u32 len = pb[i].len; + + dma = dma_map_single(&hv_dev->device, src, len, + DMA_TO_DEVICE); + if (dma_mapping_error(&hv_dev->device, dma)) { + kfree(packet->dma_range); + return -ENOMEM; + } + + packet->dma_range[i].dma = dma; + packet->dma_range[i].mapping_size = len; + pb[i].pfn = dma >> HV_HYP_PAGE_SHIFT; + pb[i].offset = offset_in_hvpage(dma); + pb[i].len = len; + } + + return 0; +} + static inline int netvsc_send_pkt( struct hv_device *device, struct hv_netvsc_packet *packet, @@ -987,14 +1117,22 @@ static inline int netvsc_send_pkt( trace_nvsp_send_pkt(ndev, out_channel, rpkt); + packet->dma_range = NULL; if (packet->page_buf_cnt) { if (packet->cp_partial) pb += packet->rmsg_pgcnt; + ret = netvsc_dma_map(ndev_ctx->device_ctx, packet, pb); + if (ret) + return ret; + ret = vmbus_sendpacket_pagebuffer(out_channel, pb, packet->page_buf_cnt, &nvmsg, sizeof(nvmsg), req_id); + + if (ret) + netvsc_dma_unmap(ndev_ctx->device_ctx, packet); } else { ret = vmbus_sendpacket(out_channel, &nvmsg, sizeof(nvmsg), diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c index f6c9c2a670f9..448fcc325ed7 100644 --- a/drivers/net/hyperv/rndis_filter.c +++ b/drivers/net/hyperv/rndis_filter.c @@ -361,6 +361,8 @@ static void rndis_filter_receive_response(struct net_device *ndev, } } + netvsc_dma_unmap(((struct net_device_context *) + netdev_priv(ndev))->device_ctx, &request->pkt); complete(&request->wait_event); } else { netdev_err(ndev, diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index cb4695c893a6..2d4cf1ef4062 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -1617,6 +1617,11 @@ struct hyperv_service_callback { void (*callback)(void *context); }; +struct hv_dma_range { + dma_addr_t dma; + u32 mapping_size; +}; + #define MAX_SRV_VER 0x7ffffff extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, u8 *buf, u32 buflen, const int *fw_version, int fw_vercnt, From patchwork Wed Aug 4 18:45:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 492001 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EA5D6C432BE for ; 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Wed, 04 Aug 2021 11:45:58 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:f:1947:6842:b8a8:6f83]) by smtp.gmail.com with ESMTPSA id f5sm3325647pjo.23.2021.08.04.11.45.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Aug 2021 11:45:57 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu.Lan@microsoft.com, rppt@kernel.org, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, martin.b.radev@gmail.com, ardb@kernel.org, rientjes@google.com, tj@kernel.org, keescook@chromium.org, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, parri.andrea@gmail.com Subject: [PATCH V2 14/14] HV/Storvsc: Add Isolation VM support for storvsc driver Date: Wed, 4 Aug 2021 14:45:10 -0400 Message-Id: <20210804184513.512888-15-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210804184513.512888-1-ltykernel@gmail.com> References: <20210804184513.512888-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan In Isolation VM, all shared memory with host needs to mark visible to host via hvcall. vmbus_establish_gpadl() has already done it for storvsc rx/tx ring buffer. The page buffer used by vmbus_sendpacket_ mpb_desc() still need to handle. Use DMA API to map/umap these memory during sending/receiving packet and Hyper-V DMA ops callback will use swiotlb function to allocate bounce buffer and copy data from/to bounce buffer. Signed-off-by: Tianyu Lan --- drivers/scsi/storvsc_drv.c | 68 +++++++++++++++++++++++++++++++++++--- 1 file changed, 63 insertions(+), 5 deletions(-) diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index 328bb961c281..78320719bdd8 100644 --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -21,6 +21,8 @@ #include #include #include +#include +#include #include #include #include @@ -427,6 +429,8 @@ struct storvsc_cmd_request { u32 payload_sz; struct vstor_packet vstor_packet; + u32 hvpg_count; + struct hv_dma_range *dma_range; }; @@ -509,6 +513,14 @@ struct storvsc_scan_work { u8 tgt_id; }; +#define storvsc_dma_map(dev, page, offset, size, dir) \ + dma_map_page(dev, page, offset, size, dir) + +#define storvsc_dma_unmap(dev, dma_range, dir) \ + dma_unmap_page(dev, dma_range.dma, \ + dma_range.mapping_size, \ + dir ? DMA_FROM_DEVICE : DMA_TO_DEVICE) + static void storvsc_device_scan(struct work_struct *work) { struct storvsc_scan_work *wrk; @@ -1260,6 +1272,7 @@ static void storvsc_on_channel_callback(void *context) struct hv_device *device; struct storvsc_device *stor_device; struct Scsi_Host *shost; + int i; if (channel->primary_channel != NULL) device = channel->primary_channel->device_obj; @@ -1314,6 +1327,15 @@ static void storvsc_on_channel_callback(void *context) request = (struct storvsc_cmd_request *)scsi_cmd_priv(scmnd); } + if (request->dma_range) { + for (i = 0; i < request->hvpg_count; i++) + storvsc_dma_unmap(&device->device, + request->dma_range[i], + request->vstor_packet.vm_srb.data_in == READ_TYPE); + + kfree(request->dma_range); + } + storvsc_on_receive(stor_device, packet, request); continue; } @@ -1810,7 +1832,9 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) unsigned int hvpgoff, hvpfns_to_add; unsigned long offset_in_hvpg = offset_in_hvpage(sgl->offset); unsigned int hvpg_count = HVPFN_UP(offset_in_hvpg + length); + dma_addr_t dma; u64 hvpfn; + u32 size; if (hvpg_count > MAX_PAGE_BUFFER_COUNT) { @@ -1824,6 +1848,13 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) payload->range.len = length; payload->range.offset = offset_in_hvpg; + cmd_request->dma_range = kcalloc(hvpg_count, + sizeof(*cmd_request->dma_range), + GFP_ATOMIC); + if (!cmd_request->dma_range) { + ret = -ENOMEM; + goto free_payload; + } for (i = 0; sgl != NULL; sgl = sg_next(sgl)) { /* @@ -1847,9 +1878,29 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) * last sgl should be reached at the same time that * the PFN array is filled. */ - while (hvpfns_to_add--) - payload->range.pfn_array[i++] = hvpfn++; + while (hvpfns_to_add--) { + size = min(HV_HYP_PAGE_SIZE - offset_in_hvpg, + (unsigned long)length); + dma = storvsc_dma_map(&dev->device, pfn_to_page(hvpfn++), + offset_in_hvpg, size, + scmnd->sc_data_direction); + if (dma_mapping_error(&dev->device, dma)) { + ret = -ENOMEM; + goto free_dma_range; + } + + if (offset_in_hvpg) { + payload->range.offset = dma & ~HV_HYP_PAGE_MASK; + offset_in_hvpg = 0; + } + + cmd_request->dma_range[i].dma = dma; + cmd_request->dma_range[i].mapping_size = size; + payload->range.pfn_array[i++] = dma >> HV_HYP_PAGE_SHIFT; + length -= size; + } } + cmd_request->hvpg_count = hvpg_count; } cmd_request->payload = payload; @@ -1860,13 +1911,20 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) put_cpu(); if (ret == -EAGAIN) { - if (payload_sz > sizeof(cmd_request->mpb)) - kfree(payload); /* no more space */ - return SCSI_MLQUEUE_DEVICE_BUSY; + ret = SCSI_MLQUEUE_DEVICE_BUSY; + goto free_dma_range; } return 0; + +free_dma_range: + kfree(cmd_request->dma_range); + +free_payload: + if (payload_sz > sizeof(cmd_request->mpb)) + kfree(payload); + return ret; } static struct scsi_host_template scsi_driver = {