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Fri, 13 Feb 2026 08:46:41 -0800 (PST) X-Received: by 2002:a05:600c:8b6c:b0:47e:e8c2:905f with SMTP id 5b1f17b1804b1-483739fc46amr42487965e9.8.1771001200806; Fri, 13 Feb 2026 08:46:40 -0800 (PST) Received: from [192.168.10.48] ([151.61.26.160]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48370a4e149sm32898685e9.2.2026.02.13.08.46.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Feb 2026 08:46:39 -0800 (PST) From: Paolo Bonzini To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: [PATCH v2 2/2] KVM: always define KVM_CAP_SYNC_MMU Date: Fri, 13 Feb 2026 17:46:35 +0100 Message-ID: <20260213164635.33630-3-pbonzini@redhat.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260213164635.33630-1-pbonzini@redhat.com> References: <20260213164635.33630-1-pbonzini@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" KVM_CAP_SYNC_MMU is provided by KVM's MMU notifiers, which are now always available. Move the definition from individual architectures to common code. Signed-off-by: Paolo Bonzini --- Documentation/virt/kvm/api.rst | 10 ++++------ arch/arm64/kvm/arm.c | 1 - arch/loongarch/kvm/vm.c | 1 - arch/mips/kvm/mips.c | 1 - arch/powerpc/kvm/powerpc.c | 5 ----- arch/riscv/kvm/vm.c | 1 - arch/s390/kvm/kvm-s390.c | 1 - arch/x86/kvm/x86.c | 1 - virt/kvm/kvm_main.c | 1 + 9 files changed, 5 insertions(+), 17 deletions(-) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index fc5736839edd..6f85e1b321dd 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -1396,7 +1396,10 @@ or its flags may be modified, but it may not be resi= zed. Memory for the region is taken starting at the address denoted by the field userspace_addr, which must point at user addressable memory for the entire memory slot size. Any object may back this memory, including -anonymous memory, ordinary files, and hugetlbfs. +anonymous memory, ordinary files, and hugetlbfs. Changes in the backing +of the memory region are automatically reflected into the guest. +For example, an mmap() that affects the region will be made visible +immediately. Another example is madvise(MADV_DROP). =20 On architectures that support a form of address tagging, userspace_addr mu= st be an untagged address. @@ -1412,11 +1415,6 @@ use it. The latter can be set, if KVM_CAP_READONLY_= MEM capability allows it, to make a new slot read-only. In this case, writes to this memory will be posted to userspace as KVM_EXIT_MMIO exits. =20 -When the KVM_CAP_SYNC_MMU capability is available, changes in the backing = of -the memory region are automatically reflected into the guest. For example= , an -mmap() that affects the region will be made visible immediately. Another -example is madvise(MADV_DROP). - For TDX guest, deleting/moving memory region loses guest memory contents. Read only region isn't supported. Only as-id 0 is supported. =20 diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 94d5b0b99fd1..7309f5084388 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -358,7 +358,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long = ext) break; case KVM_CAP_IOEVENTFD: case KVM_CAP_USER_MEMORY: - case KVM_CAP_SYNC_MMU: case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: case KVM_CAP_ONE_REG: case KVM_CAP_ARM_PSCI: diff --git a/arch/loongarch/kvm/vm.c b/arch/loongarch/kvm/vm.c index 9681ade890c6..41b58ec45f41 100644 --- a/arch/loongarch/kvm/vm.c +++ b/arch/loongarch/kvm/vm.c @@ -117,7 +117,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long = ext) case KVM_CAP_ONE_REG: case KVM_CAP_ENABLE_CAP: case KVM_CAP_READONLY_MEM: - case KVM_CAP_SYNC_MMU: case KVM_CAP_IMMEDIATE_EXIT: case KVM_CAP_IOEVENTFD: case KVM_CAP_MP_STATE: diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index b0fb92fda4d4..29d9f630edfb 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -1035,7 +1035,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, lon= g ext) case KVM_CAP_ONE_REG: case KVM_CAP_ENABLE_CAP: case KVM_CAP_READONLY_MEM: - case KVM_CAP_SYNC_MMU: case KVM_CAP_IMMEDIATE_EXIT: r =3D 1; break; diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 3da40ea8c562..00302399fc37 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -623,11 +623,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long= ext) r =3D !!(hv_enabled && kvmppc_hv_ops->enable_nested && !kvmppc_hv_ops->enable_nested(NULL)); break; -#endif - case KVM_CAP_SYNC_MMU: - r =3D 1; - break; -#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE case KVM_CAP_PPC_HTAB_FD: r =3D hv_enabled; break; diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c index 66d91ae6e9b2..b4afef7e59fc 100644 --- a/arch/riscv/kvm/vm.c +++ b/arch/riscv/kvm/vm.c @@ -181,7 +181,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long = ext) break; case KVM_CAP_IOEVENTFD: case KVM_CAP_USER_MEMORY: - case KVM_CAP_SYNC_MMU: case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: case KVM_CAP_ONE_REG: case KVM_CAP_READONLY_MEM: diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index de645025db0f..6591ee56bf5b 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -601,7 +601,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long = ext) switch (ext) { case KVM_CAP_S390_PSW: case KVM_CAP_S390_GMAP: - case KVM_CAP_SYNC_MMU: #ifdef CONFIG_KVM_S390_UCONTROL case KVM_CAP_S390_UCONTROL: #endif diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 391f4a5ce6dd..ac31b098bfbd 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4805,7 +4805,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, lon= g ext) #endif case KVM_CAP_NOP_IO_DELAY: case KVM_CAP_MP_STATE: - case KVM_CAP_SYNC_MMU: case KVM_CAP_USER_NMI: case KVM_CAP_IRQ_INJECT_STATUS: case KVM_CAP_IOEVENTFD: diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index bf5606d76f0c..51d1f7d4905e 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -4870,6 +4870,7 @@ static int kvm_ioctl_create_device(struct kvm *kvm, static int kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) { switch (arg) { + case KVM_CAP_SYNC_MMU: case KVM_CAP_USER_MEMORY: case KVM_CAP_USER_MEMORY2: case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: --=20 2.52.0