From patchwork Sat Dec 30 16:19:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Roth X-Patchwork-Id: 758988 Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12on2058.outbound.protection.outlook.com [40.107.237.58]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4AB4FF9DB; Sat, 30 Dec 2023 16:24:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="b3awTLGo" ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=bLT3ZwNE4uvTmiKjvQEZC0oqZQA06od/E9v1LJ6H17NA7/TiLD8Rj1u+HcW0d+FoQ/x86IezB4/RnfEpVPW/jE0uV/x9gndopaAky/S9vnbLcM3/2399HAvLS6K5G05UKBitZjlQM45ZjLqPt6p6yHbGMr+kAe6sl0ZL07MUCV9gBzpaiPkx9iDjkbcKFylgBfjvvcuaiqqt8nxNdU+PhOtL+sxC+ykKUNnS5AoXWGTPSPetHooVh3qzIfm5qW42BAwBq6oHPliwnzMoJZ4EVzrfJt9Mg08Qor13SO0Tg+TSUjORGJ3fv34lyP4Sf3+KIKsJEAbTuubJQgAh9Q68xg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=FA/1t8PixMH/B1yHI9ZjiXPt3EbWWVp9WThdwCnuvmo=; b=B3Z1H5hbyqgchwctDIY3mnEjKUW+itQW1OPIw044gO5MAm7sl5EYEUeI4KZQ/rYwYoZRf+ipojeH+/wjpLeq6imUZLQSr6AnBPKTrm6sUgd7382wl2eRCxCf1OddSk5FecRf+U44E5rmNBPwqrlM4rx5+cLlmovORW9VUf/gk+5d5aHMGUtl0FzHrLQaZ33lNe/t1g/IsewG52vKBKbRIoREbJGSh9/uTmgN36aC0w7obKz0Z7Mc7QsD5ll/zC7znNfFVvhckgt0gDoETYKcbju2o+Sdmbu23wBHMK5ovOcSbRRPjLiDClT1uHIn1nyDnEGM22UKJDYf14FPquGIvQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=kernel.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=FA/1t8PixMH/B1yHI9ZjiXPt3EbWWVp9WThdwCnuvmo=; b=b3awTLGo/Glo3wPaDjnjRYBFzaTGIUywkHw0hhm3fx167pBu8BWpIqvQH8ti0bo0JcNoNkovjhyKL/U2wRYGHx+tjXwXrK+Zfov1Xpg7IM9wp7mV9P3lW6FRqWcfMtiVgWLRBdkrRhHquxL+9+iJt+1nwpsDCV+ClTegX2mpyws= Received: from DM6PR04CA0018.namprd04.prod.outlook.com (2603:10b6:5:334::23) by BL1PR12MB5253.namprd12.prod.outlook.com (2603:10b6:208:30b::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7135.22; Sat, 30 Dec 2023 16:24:13 +0000 Received: from DS1PEPF0001709D.namprd05.prod.outlook.com (2603:10b6:5:334:cafe::e1) by DM6PR04CA0018.outlook.office365.com (2603:10b6:5:334::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7135.20 via Frontend Transport; Sat, 30 Dec 2023 16:24:13 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by DS1PEPF0001709D.mail.protection.outlook.com (10.167.18.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7159.9 via Frontend Transport; Sat, 30 Dec 2023 16:24:13 +0000 Received: from localhost (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.34; Sat, 30 Dec 2023 10:24:11 -0600 From: Michael Roth To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Brijesh Singh Subject: [PATCH v1 16/26] crypto: ccp: Handle the legacy TMR allocation when SNP is enabled Date: Sat, 30 Dec 2023 10:19:44 -0600 Message-ID: <20231230161954.569267-17-michael.roth@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231230161954.569267-1-michael.roth@amd.com> References: <20231230161954.569267-1-michael.roth@amd.com> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS1PEPF0001709D:EE_|BL1PR12MB5253:EE_ X-MS-Office365-Filtering-Correlation-Id: 538d34b3-346f-4ce6-67b5-08dc0953c2c9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230031)(4636009)(136003)(39860400002)(396003)(376002)(346002)(230173577357003)(230922051799003)(230273577357003)(82310400011)(1800799012)(186009)(451199024)(64100799003)(46966006)(36840700001)(40470700004)(26005)(1076003)(54906003)(70586007)(70206006)(40460700003)(6916009)(40480700001)(2616005)(6666004)(83380400001)(4326008)(8676002)(8936002)(36756003)(316002)(336012)(426003)(478600001)(16526019)(44832011)(7416002)(7406005)(5660300002)(47076005)(86362001)(356005)(2906002)(81166007)(36860700001)(82740400003)(41300700001)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Dec 2023 16:24:13.3901 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 538d34b3-346f-4ce6-67b5-08dc0953c2c9 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF0001709D.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5253 From: Brijesh Singh The behavior and requirement for the SEV-legacy command is altered when the SNP firmware is in the INIT state. See SEV-SNP firmware specification for more details. Allocate the Trusted Memory Region (TMR) as a 2mb sized/aligned region when SNP is enabled to satisfy new requirements for SNP. Continue allocating a 1mb region for !SNP configuration. While at it, provide an API to allocate a firmware page. The KVM driver needs to allocate a firmware context page during the guest creation. The context page needs to be updated by the firmware. See the SEV-SNP specification for further details. Signed-off-by: Brijesh Singh Co-developed-by: Ashish Kalra Signed-off-by: Ashish Kalra [mdr: use struct sev_data_snp_page_reclaim instead of passing paddr directly to SEV_CMD_SNP_PAGE_RECLAIM] Signed-off-by: Michael Roth --- drivers/crypto/ccp/sev-dev.c | 176 +++++++++++++++++++++++++++++++---- include/linux/psp-sev.h | 9 ++ 2 files changed, 165 insertions(+), 20 deletions(-) diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 767f0ec3d5bb..307eb3e7c354 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -30,6 +30,7 @@ #include #include #include +#include #include "psp-dev.h" #include "sev-dev.h" @@ -73,9 +74,14 @@ static int psp_timeout; * The TMR is a 1MB area that must be 1MB aligned. Use the page allocator * to allocate the memory, which will return aligned memory for the specified * allocation order. + * + * When SEV-SNP is enabled the TMR needs to be 2MB aligned and 2MB sized. */ -#define SEV_ES_TMR_SIZE (1024 * 1024) +#define SEV_TMR_SIZE (1024 * 1024) +#define SNP_TMR_SIZE (2 * 1024 * 1024) + static void *sev_es_tmr; +static size_t sev_es_tmr_size = SEV_TMR_SIZE; /* INIT_EX NV Storage: * The NV Storage is a 32Kb area and must be 4Kb page aligned. Use the page @@ -192,17 +198,6 @@ static int sev_cmd_buffer_len(int cmd) return 0; } -static void *sev_fw_alloc(unsigned long len) -{ - struct page *page; - - page = alloc_pages(GFP_KERNEL, get_order(len)); - if (!page) - return NULL; - - return page_address(page); -} - static struct file *open_file_as_root(const char *filename, int flags, umode_t mode) { struct file *fp; @@ -333,6 +328,142 @@ static int sev_write_init_ex_file_if_required(int cmd_id) return sev_write_init_ex_file(); } +/* + * snp_reclaim_pages() needs __sev_do_cmd_locked(), and __sev_do_cmd_locked() + * needs snp_reclaim_pages(), so a forward declaration is needed. + */ +static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret); + +static int snp_reclaim_pages(unsigned long paddr, unsigned int npages, bool locked) +{ + int ret, err, i; + + paddr = __sme_clr(paddr); + + for (i = 0; i < npages; i++, paddr += PAGE_SIZE) { + struct sev_data_snp_page_reclaim data = {0}; + + data.paddr = paddr; + + if (locked) + ret = __sev_do_cmd_locked(SEV_CMD_SNP_PAGE_RECLAIM, &data, &err); + else + ret = sev_do_cmd(SEV_CMD_SNP_PAGE_RECLAIM, &data, &err); + + if (ret) + goto cleanup; + + ret = rmp_make_shared(__phys_to_pfn(paddr), PG_LEVEL_4K); + if (ret) + goto cleanup; + } + + return 0; + +cleanup: + /* + * If there was a failure reclaiming the page then it is no longer safe + * to release it back to the system; leak it instead. + */ + snp_leak_pages(__phys_to_pfn(paddr), npages - i); + return ret; +} + +static int rmp_mark_pages_firmware(unsigned long paddr, unsigned int npages, bool locked) +{ + unsigned long pfn = __sme_clr(paddr) >> PAGE_SHIFT; + int rc, i; + + for (i = 0; i < npages; i++, pfn++) { + rc = rmp_make_private(pfn, 0, PG_LEVEL_4K, 0, true); + if (rc) + goto cleanup; + } + + return 0; + +cleanup: + /* + * Try unrolling the firmware state changes by + * reclaiming the pages which were already changed to the + * firmware state. + */ + snp_reclaim_pages(paddr, i, locked); + + return rc; +} + +static struct page *__snp_alloc_firmware_pages(gfp_t gfp_mask, int order) +{ + unsigned long npages = 1ul << order, paddr; + struct sev_device *sev; + struct page *page; + + if (!psp_master || !psp_master->sev_data) + return NULL; + + page = alloc_pages(gfp_mask, order); + if (!page) + return NULL; + + /* If SEV-SNP is initialized then add the page in RMP table. */ + sev = psp_master->sev_data; + if (!sev->snp_initialized) + return page; + + paddr = __pa((unsigned long)page_address(page)); + if (rmp_mark_pages_firmware(paddr, npages, false)) + return NULL; + + return page; +} + +void *snp_alloc_firmware_page(gfp_t gfp_mask) +{ + struct page *page; + + page = __snp_alloc_firmware_pages(gfp_mask, 0); + + return page ? page_address(page) : NULL; +} +EXPORT_SYMBOL_GPL(snp_alloc_firmware_page); + +static void __snp_free_firmware_pages(struct page *page, int order, bool locked) +{ + struct sev_device *sev = psp_master->sev_data; + unsigned long paddr, npages = 1ul << order; + + if (!page) + return; + + paddr = __pa((unsigned long)page_address(page)); + if (sev->snp_initialized && + snp_reclaim_pages(paddr, npages, locked)) + return; + + __free_pages(page, order); +} + +void snp_free_firmware_page(void *addr) +{ + if (!addr) + return; + + __snp_free_firmware_pages(virt_to_page(addr), 0, false); +} +EXPORT_SYMBOL_GPL(snp_free_firmware_page); + +static void *sev_fw_alloc(unsigned long len) +{ + struct page *page; + + page = __snp_alloc_firmware_pages(GFP_KERNEL, get_order(len)); + if (!page) + return NULL; + + return page_address(page); +} + static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) { struct psp_device *psp = psp_master; @@ -456,7 +587,7 @@ static int __sev_init_locked(int *error) data.tmr_address = __pa(sev_es_tmr); data.flags |= SEV_INIT_FLAGS_SEV_ES; - data.tmr_len = SEV_ES_TMR_SIZE; + data.tmr_len = sev_es_tmr_size; } return __sev_do_cmd_locked(SEV_CMD_INIT, &data, error); @@ -479,7 +610,7 @@ static int __sev_init_ex_locked(int *error) data.tmr_address = __pa(sev_es_tmr); data.flags |= SEV_INIT_FLAGS_SEV_ES; - data.tmr_len = SEV_ES_TMR_SIZE; + data.tmr_len = sev_es_tmr_size; } return __sev_do_cmd_locked(SEV_CMD_INIT_EX, &data, error); @@ -625,6 +756,8 @@ static int __sev_snp_init_locked(int *error) sev->snp_initialized = true; dev_dbg(sev->dev, "SEV-SNP firmware initialized\n"); + sev_es_tmr_size = SNP_TMR_SIZE; + return rc; } @@ -643,14 +776,16 @@ static int __sev_platform_init_locked(int *error) if (!sev_es_tmr) { /* Obtain the TMR memory area for SEV-ES use */ - sev_es_tmr = sev_fw_alloc(SEV_ES_TMR_SIZE); - if (sev_es_tmr) + sev_es_tmr = sev_fw_alloc(sev_es_tmr_size); + if (sev_es_tmr) { /* Must flush the cache before giving it to the firmware */ - clflush_cache_range(sev_es_tmr, SEV_ES_TMR_SIZE); - else + if (!sev->snp_initialized) + clflush_cache_range(sev_es_tmr, sev_es_tmr_size); + } else { dev_warn(sev->dev, "SEV: TMR allocation failed, SEV-ES support unavailable\n"); } + } if (sev_init_ex_buffer) { rc = sev_read_init_ex_file(); @@ -1548,8 +1683,9 @@ static void sev_firmware_shutdown(struct sev_device *sev) /* The TMR area was encrypted, flush it from the cache */ wbinvd_on_all_cpus(); - free_pages((unsigned long)sev_es_tmr, - get_order(SEV_ES_TMR_SIZE)); + __snp_free_firmware_pages(virt_to_page(sev_es_tmr), + get_order(sev_es_tmr_size), + false); sev_es_tmr = NULL; } diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h index 0581f194cdd0..16d0da895680 100644 --- a/include/linux/psp-sev.h +++ b/include/linux/psp-sev.h @@ -931,6 +931,8 @@ int sev_guest_decommission(struct sev_data_decommission *data, int *error); int sev_do_cmd(int cmd, void *data, int *psp_ret); void *psp_copy_user_blob(u64 uaddr, u32 len); +void *snp_alloc_firmware_page(gfp_t mask); +void snp_free_firmware_page(void *addr); #else /* !CONFIG_CRYPTO_DEV_SP_PSP */ @@ -958,6 +960,13 @@ sev_issue_cmd_external_user(struct file *filep, unsigned int id, void *data, int static inline void *psp_copy_user_blob(u64 __user uaddr, u32 len) { return ERR_PTR(-EINVAL); } +static inline void *snp_alloc_firmware_page(gfp_t mask) +{ + return NULL; +} + +static inline void snp_free_firmware_page(void *addr) { } + #endif /* CONFIG_CRYPTO_DEV_SP_PSP */ #endif /* __PSP_SEV_H__ */