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[149.6.153.186]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4835b9768c9sm76020765e9.2.2026.02.12.02.52.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Feb 2026 02:52:13 -0800 (PST) From: Paolo Bonzini To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: [PATCH 1/2] KVM: remove CONFIG_KVM_GENERIC_MMU_NOTIFIER Date: Thu, 12 Feb 2026 11:52:10 +0100 Message-ID: <20260212105211.1555876-2-pbonzini@redhat.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260212105211.1555876-1-pbonzini@redhat.com> References: <20260212105211.1555876-1-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" All architectures now use MMU notifier for KVM page table management. Remove the Kconfig symbol and the code that is used when it is disabled. Signed-off-by: Paolo Bonzini --- arch/arm64/kvm/Kconfig | 1 - arch/loongarch/kvm/Kconfig | 1 - arch/mips/kvm/Kconfig | 1 - arch/powerpc/kvm/Kconfig | 4 ---- arch/powerpc/kvm/powerpc.c | 1 - arch/riscv/kvm/Kconfig | 1 - arch/s390/kvm/Kconfig | 1 - arch/x86/kvm/Kconfig | 1 - include/linux/kvm_host.h | 7 +------ virt/kvm/Kconfig | 8 -------- virt/kvm/kvm_main.c | 16 ---------------- 11 files changed, 1 insertion(+), 41 deletions(-) diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index 4f803fd1c99a..7d1f22fd490b 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -21,7 +21,6 @@ menuconfig KVM bool "Kernel-based Virtual Machine (KVM) support" select KVM_COMMON select KVM_GENERIC_HARDWARE_ENABLING - select KVM_GENERIC_MMU_NOTIFIER select HAVE_KVM_CPU_RELAX_INTERCEPT select KVM_MMIO select KVM_GENERIC_DIRTYLOG_READ_PROTECT diff --git a/arch/loongarch/kvm/Kconfig b/arch/loongarch/kvm/Kconfig index ed4f724db774..8e5213609975 100644 --- a/arch/loongarch/kvm/Kconfig +++ b/arch/loongarch/kvm/Kconfig @@ -28,7 +28,6 @@ config KVM select KVM_COMMON select KVM_GENERIC_DIRTYLOG_READ_PROTECT select KVM_GENERIC_HARDWARE_ENABLING - select KVM_GENERIC_MMU_NOTIFIER select KVM_MMIO select VIRT_XFER_TO_GUEST_WORK select SCHED_INFO diff --git a/arch/mips/kvm/Kconfig b/arch/mips/kvm/Kconfig index cc13cc35f208..b1b9a1d67758 100644 --- a/arch/mips/kvm/Kconfig +++ b/arch/mips/kvm/Kconfig @@ -23,7 +23,6 @@ config KVM select KVM_COMMON select KVM_GENERIC_DIRTYLOG_READ_PROTECT select KVM_MMIO - select KVM_GENERIC_MMU_NOTIFIER select KVM_GENERIC_HARDWARE_ENABLING select HAVE_KVM_READONLY_MEM help diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig index c9a2d50ff1b0..9a0d1c1aca6c 100644 --- a/arch/powerpc/kvm/Kconfig +++ b/arch/powerpc/kvm/Kconfig @@ -38,7 +38,6 @@ config KVM_BOOK3S_64_HANDLER config KVM_BOOK3S_PR_POSSIBLE bool select KVM_MMIO - select KVM_GENERIC_MMU_NOTIFIER =20 config KVM_BOOK3S_HV_POSSIBLE bool @@ -81,7 +80,6 @@ config KVM_BOOK3S_64_HV tristate "KVM for POWER7 and later using hypervisor mode in host" depends on KVM_BOOK3S_64 && PPC_POWERNV select KVM_BOOK3S_HV_POSSIBLE - select KVM_GENERIC_MMU_NOTIFIER select KVM_BOOK3S_HV_PMU select CMA help @@ -203,7 +201,6 @@ config KVM_E500V2 depends on !CONTEXT_TRACKING_USER select KVM select KVM_MMIO - select KVM_GENERIC_MMU_NOTIFIER help Support running unmodified E500 guest kernels in virtual machines on E500v2 host processors. @@ -220,7 +217,6 @@ config KVM_E500MC select KVM select KVM_MMIO select KVM_BOOKE_HV - select KVM_GENERIC_MMU_NOTIFIER help Support running unmodified E500MC/E5500/E6500 guest kernels in virtual machines on E500MC/E5500/E6500 host processors. diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 9a89a6d98f97..3da40ea8c562 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -625,7 +625,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long = ext) break; #endif case KVM_CAP_SYNC_MMU: - BUILD_BUG_ON(!IS_ENABLED(CONFIG_KVM_GENERIC_MMU_NOTIFIER)); r =3D 1; break; #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE diff --git a/arch/riscv/kvm/Kconfig b/arch/riscv/kvm/Kconfig index 77379f77840a..ec2cee0a39e0 100644 --- a/arch/riscv/kvm/Kconfig +++ b/arch/riscv/kvm/Kconfig @@ -30,7 +30,6 @@ config KVM select KVM_GENERIC_HARDWARE_ENABLING select KVM_MMIO select VIRT_XFER_TO_GUEST_WORK - select KVM_GENERIC_MMU_NOTIFIER select SCHED_INFO select GUEST_PERF_EVENTS if PERF_EVENTS help diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig index 917ac740513e..7f2c966e70af 100644 --- a/arch/s390/kvm/Kconfig +++ b/arch/s390/kvm/Kconfig @@ -30,7 +30,6 @@ config KVM select KVM_VFIO select MMU_NOTIFIER select VIRT_XFER_TO_GUEST_WORK - select KVM_GENERIC_MMU_NOTIFIER select KVM_MMU_LOCKLESS_AGING help Support hosting paravirtualized guest machines using the SIE diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index d916bd766c94..801bf9e520db 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -20,7 +20,6 @@ if VIRTUALIZATION config KVM_X86 def_tristate KVM if (KVM_INTEL !=3D n || KVM_AMD !=3D n) select KVM_COMMON - select KVM_GENERIC_MMU_NOTIFIER select KVM_ELIDE_TLB_FLUSH_IF_YOUNG select KVM_MMU_LOCKLESS_AGING select HAVE_KVM_IRQCHIP diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index d42a95cbcfbc..db9b6856f6cb 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -253,7 +253,6 @@ bool kvm_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr= 2_or_gpa, int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu); #endif =20 -#ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER union kvm_mmu_notifier_arg { unsigned long attributes; }; @@ -275,7 +274,6 @@ struct kvm_gfn_range { bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range); bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range); bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range); -#endif =20 enum { OUTSIDE_GUEST_MODE, @@ -849,13 +847,12 @@ struct kvm { struct hlist_head irq_ack_notifier_list; #endif =20 -#ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER struct mmu_notifier mmu_notifier; unsigned long mmu_invalidate_seq; long mmu_invalidate_in_progress; gfn_t mmu_invalidate_range_start; gfn_t mmu_invalidate_range_end; -#endif + struct list_head devices; u64 manual_dirty_log_protect; struct dentry *debugfs_dentry; @@ -2118,7 +2115,6 @@ extern const struct _kvm_stats_desc kvm_vm_stats_desc= []; extern const struct kvm_stats_header kvm_vcpu_stats_header; extern const struct _kvm_stats_desc kvm_vcpu_stats_desc[]; =20 -#ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER static inline int mmu_invalidate_retry(struct kvm *kvm, unsigned long mmu_= seq) { if (unlikely(kvm->mmu_invalidate_in_progress)) @@ -2196,7 +2192,6 @@ static inline bool mmu_invalidate_retry_gfn_unsafe(st= ruct kvm *kvm, =20 return READ_ONCE(kvm->mmu_invalidate_seq) !=3D mmu_seq; } -#endif =20 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING =20 diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig index 267c7369c765..9e7d3553e6a7 100644 --- a/virt/kvm/Kconfig +++ b/virt/kvm/Kconfig @@ -93,24 +93,16 @@ config HAVE_KVM_PM_NOTIFIER config KVM_GENERIC_HARDWARE_ENABLING bool =20 -config KVM_GENERIC_MMU_NOTIFIER - select MMU_NOTIFIER - bool - config KVM_ELIDE_TLB_FLUSH_IF_YOUNG - depends on KVM_GENERIC_MMU_NOTIFIER bool =20 config KVM_MMU_LOCKLESS_AGING - depends on KVM_GENERIC_MMU_NOTIFIER bool =20 config KVM_GENERIC_MEMORY_ATTRIBUTES - depends on KVM_GENERIC_MMU_NOTIFIER bool =20 config KVM_GUEST_MEMFD - depends on KVM_GENERIC_MMU_NOTIFIER select XARRAY_MULTI bool =20 diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 61dca8d37abc..bf5606d76f0c 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -502,7 +502,6 @@ void kvm_destroy_vcpus(struct kvm *kvm) } EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_destroy_vcpus); =20 -#ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) { return container_of(mn, struct kvm, mmu_notifier); @@ -901,15 +900,6 @@ static int kvm_init_mmu_notifier(struct kvm *kvm) return mmu_notifier_register(&kvm->mmu_notifier, current->mm); } =20 -#else /* !CONFIG_KVM_GENERIC_MMU_NOTIFIER */ - -static int kvm_init_mmu_notifier(struct kvm *kvm) -{ - return 0; -} - -#endif /* CONFIG_KVM_GENERIC_MMU_NOTIFIER */ - #ifdef CONFIG_HAVE_KVM_PM_NOTIFIER static int kvm_pm_notifier_call(struct notifier_block *bl, unsigned long state, @@ -1226,10 +1216,8 @@ static struct kvm *kvm_create_vm(unsigned long type,= const char *fdname) out_err_no_debugfs: kvm_coalesced_mmio_free(kvm); out_no_coalesced_mmio: -#ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER if (kvm->mmu_notifier.ops) mmu_notifier_unregister(&kvm->mmu_notifier, current->mm); -#endif out_err_no_mmu_notifier: kvm_disable_virtualization(); out_err_no_disable: @@ -1292,7 +1280,6 @@ static void kvm_destroy_vm(struct kvm *kvm) kvm->buses[i] =3D NULL; } kvm_coalesced_mmio_free(kvm); -#ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); 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[149.6.153.186]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4835a619c7dsm67722695e9.2.2026.02.12.02.52.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Feb 2026 02:52:15 -0800 (PST) From: Paolo Bonzini To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: [PATCH 2/2] KVM: always define KVM_CAP_SYNC_MMU Date: Thu, 12 Feb 2026 11:52:11 +0100 Message-ID: <20260212105211.1555876-3-pbonzini@redhat.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260212105211.1555876-1-pbonzini@redhat.com> References: <20260212105211.1555876-1-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