diff options
| author | David Stevens <stevensd@chromium.org> | 2021-09-22 13:58:59 +0900 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-10-01 03:44:58 -0400 |
| commit | deae4a10f16649d9c8bfb89f38b61930fb938284 (patch) | |
| tree | 1a02e48834bd4dcebf1f06d4828a4fadada9ebb8 /arch/x86/include/asm/kvm_page_track.h | |
| parent | e9d0c0c4f7ea47d25490cd466cefe6d5c1a4d0ec (diff) | |
KVM: x86: only allocate gfn_track when necessary
Avoid allocating the gfn_track arrays if nothing needs them. If there
are no external to KVM users of the API (i.e. no GVT-g), then page
tracking is only needed for shadow page tables. This means that when tdp
is enabled and there are no external users, then the gfn_track arrays
can be lazily allocated when the shadow MMU is actually used. This avoid
allocations equal to .05% of guest memory when nested virtualization is
not used, if the kernel is compiled without GVT-g.
Signed-off-by: David Stevens <stevensd@chromium.org>
Message-Id: <20210922045859.2011227-3-stevensd@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/include/asm/kvm_page_track.h')
| -rw-r--r-- | arch/x86/include/asm/kvm_page_track.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86/include/asm/kvm_page_track.h b/arch/x86/include/asm/kvm_page_track.h index 5c12f97ce934..79d84a94f8eb 100644 --- a/arch/x86/include/asm/kvm_page_track.h +++ b/arch/x86/include/asm/kvm_page_track.h @@ -49,8 +49,11 @@ struct kvm_page_track_notifier_node { int kvm_page_track_init(struct kvm *kvm); void kvm_page_track_cleanup(struct kvm *kvm); +int kvm_page_track_enable_mmu_write_tracking(struct kvm *kvm); + void kvm_page_track_free_memslot(struct kvm_memory_slot *slot); -int kvm_page_track_create_memslot(struct kvm_memory_slot *slot, +int kvm_page_track_create_memslot(struct kvm *kvm, + struct kvm_memory_slot *slot, unsigned long npages); void kvm_slot_page_track_add_page(struct kvm *kvm, @@ -59,7 +62,8 @@ void kvm_slot_page_track_add_page(struct kvm *kvm, void kvm_slot_page_track_remove_page(struct kvm *kvm, struct kvm_memory_slot *slot, gfn_t gfn, enum kvm_page_track_mode mode); -bool kvm_slot_page_track_is_active(struct kvm_memory_slot *slot, gfn_t gfn, +bool kvm_slot_page_track_is_active(struct kvm_vcpu *vcpu, + struct kvm_memory_slot *slot, gfn_t gfn, enum kvm_page_track_mode mode); void |