From eeb87272a364311dbfe1b10dd896c3e09a02cd03 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Fri, 28 Jul 2023 18:35:19 -0700 Subject: [PATCH] KVM: x86/mmu: Don't rely on page-track mechanism to flush on memslot change Call kvm_mmu_zap_all_fast() directly when flushing a memslot instead of bouncing through the page-track mechanism. KVM (unfortunately) needs to zap and flush all page tables on memslot DELETE/MOVE irrespective of whether KVM is shadowing guest page tables. This will allow changing KVM to register a page-track notifier on the first shadow root allocation, and will also allow deleting the misguided kvm_page_track_flush_slot() hook itself once KVM-GT also moves to a different method for reacting to memslot changes. No functional change intended. Cc: Yan Zhao Link: https://lore.kernel.org/r/20221110014821.1548347-2-seanjc@google.com Reviewed-by: Yan Zhao Tested-by: Yongwei Ma Link: https://lore.kernel.org/r/20230729013535.1070024-14-seanjc@google.com Signed-off-by: Sean Christopherson Signed-off-by: Paolo Bonzini --- arch/x86/kvm/mmu/mmu.c | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index acb99a9c41ba..eabd5b13970d 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -6159,13 +6159,6 @@ static bool kvm_has_zapped_obsolete_pages(struct kvm *kvm) return unlikely(!list_empty_careful(&kvm->arch.zapped_obsolete_pages)); } -static void kvm_mmu_invalidate_zap_pages_in_memslot(struct kvm *kvm, - struct kvm_memory_slot *slot, - struct kvm_page_track_notifier_node *node) -{ - kvm_mmu_zap_all_fast(kvm); -} - int kvm_mmu_init_vm(struct kvm *kvm) { struct kvm_page_track_notifier_node *node = &kvm->arch.mmu_sp_tracker; @@ -6183,7 +6176,6 @@ int kvm_mmu_init_vm(struct kvm *kvm) } node->track_write = kvm_mmu_pte_write; - node->track_flush_slot = kvm_mmu_invalidate_zap_pages_in_memslot; kvm_page_track_register_notifier(kvm, node); kvm->arch.split_page_header_cache.kmem_cache = mmu_page_header_cache; @@ -6711,6 +6703,8 @@ void kvm_arch_flush_shadow_all(struct kvm *kvm) void kvm_arch_flush_shadow_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) { + kvm_mmu_zap_all_fast(kvm); + kvm_page_track_flush_slot(kvm, slot); }