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KVM: remove CONFIG_KVM_GENERIC_MMU_NOTIFIER

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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 <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2026-02-11 19:03:03 +01:00
parent 6de23f81a5
commit 407fd8b8d8
11 changed files with 2 additions and 42 deletions
Download patch file Download diff file Expand all files Collapse all files

9
virt/kvm/Kconfig
View file

@ -5,6 +5,7 @@ config KVM_COMMON
bool
select EVENTFD
select INTERVAL_TREE
select MMU_NOTIFIER
select PREEMPT_NOTIFIERS
config HAVE_KVM_PFNCACHE
@ -93,24 +94,16 @@ config HAVE_KVM_PM_NOTIFIER
config KVM_GENERIC_HARDWARE_ENABLING
bool
config KVM_GENERIC_MMU_NOTIFIER
select MMU_NOTIFIER
bool
config KVM_ELIDE_TLB_FLUSH_IF_YOUNG
depends on KVM_GENERIC_MMU_NOTIFIER
bool
config KVM_MMU_LOCKLESS_AGING
depends on KVM_GENERIC_MMU_NOTIFIER
bool
config KVM_GENERIC_MEMORY_ATTRIBUTES
depends on KVM_GENERIC_MMU_NOTIFIER
bool
config KVM_GUEST_MEMFD
depends on KVM_GENERIC_MMU_NOTIFIER
select XARRAY_MULTI
bool

16
virt/kvm/kvm_main.c
View file

@ -502,7 +502,6 @@ void kvm_destroy_vcpus(struct kvm *kvm)
}
EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_destroy_vcpus);
#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);
}
#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] = NULL;
}
kvm_coalesced_mmio_free(kvm);
#ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER
mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
/*
* At this point, pending calls to invalidate_range_start()
@ -1311,9 +1298,6 @@ static void kvm_destroy_vm(struct kvm *kvm)
kvm->mn_active_invalidate_count = 0;
else
WARN_ON(kvm->mmu_invalidate_in_progress);
#else
kvm_flush_shadow_all(kvm);
#endif
kvm_arch_destroy_vm(kvm);
kvm_destroy_devices(kvm);
for (i = 0; i < kvm_arch_nr_memslot_as_ids(kvm); i++) {