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AJvYcCVdcg4Ha+C7giWi3t+kf6cIvv1UTw+FhAXQBNTt5SJ18dID9VmFOVc7odvtdB87kwmpWnJBrnVSt8WUTcUZ@vger.kernel.org X-Gm-Message-State: AOJu0YxfBMl+UEyTSiW07DzEBcUFObPjaeLv4VlAJnjzHdEfPRnpqW1R a8OicAwbMZ21MYd3D0CpVFHITdng9ZfXf+Q8KwfGdjujhiPnhvsCFsyAcIwb4ErxUvyeg55WQg= = X-Google-Smtp-Source: AGHT+IHeXWv9UlvNwtt49TJOJkvo4Sw+243biArECpj/wEQYlB+Xl6ffPPZWh7+IujbdTMPrByuwczoUyA== X-Received: from wmph6.prod.google.com ([2002:a05:600c:4986:b0:434:e96f:86b0]) (user=tabba job=prod-delivery.src-stubby-dispatcher) by 2002:a5d:5986:0:b0:385:dea3:6059 with SMTP id ffacd0b85a97d-3889ad32e66mr2769505f8f.49.1734108493083; Fri, 13 Dec 2024 08:48:13 -0800 (PST) Date: Fri, 13 Dec 2024 16:47:56 +0000 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.47.1.613.gc27f4b7a9f-goog Message-ID: <20241213164811.2006197-1-tabba@google.com> Subject: [RFC PATCH v4 00/14] KVM: Restricted mapping of guest_memfd at the host and arm64 support From: Fuad Tabba To: kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org Cc: pbonzini@redhat.com, chenhuacai@kernel.org, mpe@ellerman.id.au, anup@brainfault.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, seanjc@google.com, viro@zeniv.linux.org.uk, brauner@kernel.org, willy@infradead.org, akpm@linux-foundation.org, xiaoyao.li@intel.com, yilun.xu@intel.com, chao.p.peng@linux.intel.com, jarkko@kernel.org, amoorthy@google.com, dmatlack@google.com, yu.c.zhang@linux.intel.com, isaku.yamahata@intel.com, mic@digikod.net, vbabka@suse.cz, vannapurve@google.com, ackerleytng@google.com, mail@maciej.szmigiero.name, david@redhat.com, michael.roth@amd.com, wei.w.wang@intel.com, liam.merwick@oracle.com, isaku.yamahata@gmail.com, kirill.shutemov@linux.intel.com, suzuki.poulose@arm.com, steven.price@arm.com, quic_eberman@quicinc.com, quic_mnalajal@quicinc.com, quic_tsoni@quicinc.com, quic_svaddagi@quicinc.com, quic_cvanscha@quicinc.com, quic_pderrin@quicinc.com, quic_pheragu@quicinc.com, catalin.marinas@arm.com, james.morse@arm.com, yuzenghui@huawei.com, oliver.upton@linux.dev, maz@kernel.org, will@kernel.org, qperret@google.com, keirf@google.com, roypat@amazon.co.uk, shuah@kernel.org, hch@infradead.org, jgg@nvidia.com, rientjes@google.com, jhubbard@nvidia.com, fvdl@google.com, hughd@google.com, jthoughton@google.com, tabba@google.com This series adds restricted mmap() support to guest_memfd, as well as support for guest_memfd on arm64. It is based on Linux 6.13-rc2. Please refer to v3 for the context [1]. Main changes since v3: - Added a new folio type for guestmem, used to register a callback when a folio's reference count reaches 0 (Matthew Wilcox, DavidH) [2] - Introduce new mappability states for folios, where a folio can be mappable by the host and the guest, only the guest, or by no one (transient state) - Rebased on Linux 6.13-rc2 - Refactoring and tidying up Cheers, /fuad [1] https://lore.kernel.org/all/20241010085930.1546800-1-tabba@google.com/ [2] https://lore.kernel.org/all/20241108162040.159038-1-tabba@google.com/ Ackerley Tng (2): KVM: guest_memfd: Make guest mem use guest mem inodes instead of anonymous inodes KVM: guest_memfd: Track mappability within a struct kvm_gmem_private Fuad Tabba (12): mm: Consolidate freeing of typed folios on final folio_put() KVM: guest_memfd: Introduce kvm_gmem_get_pfn_locked(), which retains the folio lock KVM: guest_memfd: Folio mappability states and functions that manage their transition KVM: guest_memfd: Handle final folio_put() of guestmem pages KVM: guest_memfd: Allow host to mmap guest_memfd() pages when shared KVM: guest_memfd: Add guest_memfd support to kvm_(read|/write)_guest_page() KVM: guest_memfd: Add KVM capability to check if guest_memfd is host mappable KVM: guest_memfd: Add a guest_memfd() flag to initialize it as mappable KVM: guest_memfd: selftests: guest_memfd mmap() test when mapping is allowed KVM: arm64: Skip VMA checks for slots without userspace address KVM: arm64: Handle guest_memfd()-backed guest page faults KVM: arm64: Enable guest_memfd private memory when pKVM is enabled Documentation/virt/kvm/api.rst | 4 + arch/arm64/include/asm/kvm_host.h | 3 + arch/arm64/kvm/Kconfig | 1 + arch/arm64/kvm/mmu.c | 119 +++- include/linux/kvm_host.h | 75 +++ include/linux/page-flags.h | 22 + include/uapi/linux/kvm.h | 2 + include/uapi/linux/magic.h | 1 + mm/debug.c | 1 + mm/swap.c | 28 +- tools/testing/selftests/kvm/Makefile | 1 + .../testing/selftests/kvm/guest_memfd_test.c | 64 +- virt/kvm/Kconfig | 4 + virt/kvm/guest_memfd.c | 579 +++++++++++++++++- virt/kvm/kvm_main.c | 229 ++++++- 15 files changed, 1074 insertions(+), 59 deletions(-) base-commit: fac04efc5c793dccbd07e2d59af9f90b7fc0dca4