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AJvYcCWulvoYVH2S9sxR45WrTo8QN5Ia74VMXj2jMn4nVAb4clsHV3PwjWTT8pPsiJ54krtDGb6I1fQ4t48BGJAs@vger.kernel.org X-Gm-Message-State: AOJu0YwPztHhgtY3T988RtjHP3c067FHhYGj1yQAe7Mxbc0u+rFZskeH YKHlpavQ+0Qyg+PlFBPNNGd9MgmHDDX/mOHo4K06pdx+jqbU2m3FVsqN8YIMS84OX0br8P9L2w= = X-Google-Smtp-Source: AGHT+IHb487+BvontEArNfyNxjH1CxF20OtRn/FgWb9LSiqLeRuLnLUB21OFCh3NW6hXbiFjnsY3KBFrYg== X-Received: from wmbgx13.prod.google.com ([2002:a05:600c:858d:b0:43b:bd03:5d2]) (user=tabba job=prod-delivery.src-stubby-dispatcher) by 2002:a5d:648c:0:b0:390:f6aa:4e80 with SMTP id ffacd0b85a97d-3996b4a1e7fmr4379310f8f.53.1742314705084; Tue, 18 Mar 2025 09:18:25 -0700 (PDT) Date: Tue, 18 Mar 2025 16:18:14 +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 2.49.0.rc1.451.g8f38331e32-goog Message-ID: <20250318161823.4005529-1-tabba@google.com> Subject: [PATCH v7 0/9] KVM: Mapping guest_memfd backed memory at the host for software protected VMs 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, 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, peterx@redhat.com, tabba@google.com Content-Type: text/plain; charset="UTF-8" Main changes since v6 [1]: - Fix and simplify handling of final folio_put() callback in case underlying file is no longer associated with guestmem, e.g., KVM module unloaded (Ackerley, Vlastimil) - Removed dependency on folio lock when not needed (Ackerley) - Carried acks (DavidH, Vlastimil) - Rebased on Linux 6.14-rc7 The purpose of this series is to serve as a base for _restricted_ mmap() support for guest_memfd backed memory at the host [2]. It allows experimentation with what that support would be like in the safe environment of software and non-confidential VM types. For more background and for how to test this series, please refer to v2 [3]. Note that an updated version of kvmtool that works with this series is available here [4]. I'm done respinning the series that tracks folio sharing [5]. I'll post that one right after this one. Cheers, /fuad [1] https://lore.kernel.org/all/20250312175824.1809636-1-tabba@google.com/ [2] https://lore.kernel.org/all/20250117163001.2326672-1-tabba@google.com/ [3] https://lore.kernel.org/all/20250129172320.950523-1-tabba@google.com/ [4] https://android-kvm.googlesource.com/kvmtool/+/refs/heads/tabba/guestmem-6.14 [5] https://lore.kernel.org/all/20250117163001.2326672-1-tabba@google.com/ Fuad Tabba (9): mm: Consolidate freeing of typed folios on final folio_put() KVM: guest_memfd: Handle final folio_put() of guest_memfd pages KVM: guest_memfd: Allow host to map guest_memfd() pages KVM: guest_memfd: Handle in-place shared memory as guest_memfd backed memory KVM: x86: Mark KVM_X86_SW_PROTECTED_VM as supporting guest_memfd shared memory KVM: arm64: Refactor user_mem_abort() calculation of force_pte KVM: arm64: Handle guest_memfd()-backed guest page faults KVM: arm64: Enable mapping guest_memfd in arm64 KVM: guest_memfd: selftests: guest_memfd mmap() test when mapping is allowed arch/arm64/include/asm/kvm_host.h | 12 ++ arch/arm64/kvm/Kconfig | 1 + arch/arm64/kvm/mmu.c | 76 +++++++----- arch/x86/include/asm/kvm_host.h | 5 + arch/x86/kvm/Kconfig | 3 +- include/linux/kvm_host.h | 23 +++- include/linux/page-flags.h | 31 +++++ include/uapi/linux/kvm.h | 1 + mm/debug.c | 1 + mm/swap.c | 52 ++++++++- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../testing/selftests/kvm/guest_memfd_test.c | 75 +++++++++++- virt/kvm/Kconfig | 4 + virt/kvm/guest_memfd.c | 109 ++++++++++++++++++ virt/kvm/kvm_main.c | 9 +- 15 files changed, 357 insertions(+), 46 deletions(-) base-commit: 4701f33a10702d5fc577c32434eb62adde0a1ae1 -- 2.49.0.rc1.451.g8f38331e32-goog