From 0a8a5f2c8c266e9d94fb45f76a26cff135d0051c Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Thu, 1 Jun 2023 18:15:17 -0700 Subject: [PATCH] KVM: x86: Use standard mmu_notifier invalidate hooks for APIC access page Now that KVM honors past and in-progress mmu_notifier invalidations when reloading the APIC-access page, use KVM's "standard" invalidation hooks to trigger a reload and delete the one-off usage of invalidate_range(). Aside from eliminating one-off code in KVM, dropping KVM's use of invalidate_range() will allow common mmu_notifier to redefine the API to be more strictly focused on invalidating secondary TLBs that share the primary MMU's page tables. Suggested-by: Jason Gunthorpe Cc: Alistair Popple Cc: Robin Murphy Reviewed-by: Alistair Popple Reviewed-by: Paolo Bonzini Link: https://lore.kernel.org/r/20230602011518.787006-3-seanjc@google.com Signed-off-by: Sean Christopherson --- arch/x86/kvm/mmu/mmu.c | 3 +++ arch/x86/kvm/x86.c | 14 -------------- include/linux/kvm_host.h | 3 --- virt/kvm/kvm_main.c | 18 ------------------ 4 files changed, 3 insertions(+), 35 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index c8961f4..01a11ce 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -1600,6 +1600,9 @@ bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range) if (tdp_mmu_enabled) flush = kvm_tdp_mmu_unmap_gfn_range(kvm, range, flush); + if (range->slot->id == APIC_ACCESS_PAGE_PRIVATE_MEMSLOT) + kvm_make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD); + return flush; } diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index c0778ca..f962b7e 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -10435,20 +10435,6 @@ static void vcpu_load_eoi_exitmap(struct kvm_vcpu *vcpu) vcpu, (u64 *)vcpu->arch.ioapic_handled_vectors); } -void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, - unsigned long start, unsigned long end) -{ - unsigned long apic_address; - - /* - * The physical address of apic access page is stored in the VMCS. - * Update it when it becomes invalid. - */ - apic_address = gfn_to_hva(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT); - if (start <= apic_address && apic_address < end) - kvm_make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD); -} - void kvm_arch_guest_memory_reclaimed(struct kvm *kvm) { static_call_cond(kvm_x86_guest_memory_reclaimed)(kvm); diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 0e571e9..cb66f41 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -2237,9 +2237,6 @@ static inline long kvm_arch_vcpu_async_ioctl(struct file *filp, } #endif /* CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL */ -void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, - unsigned long start, unsigned long end); - void kvm_arch_guest_memory_reclaimed(struct kvm *kvm); #ifdef CONFIG_HAVE_KVM_VCPU_RUN_PID_CHANGE diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 479802a..f3c7c3c 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -154,11 +154,6 @@ static unsigned long long kvm_active_vms; static DEFINE_PER_CPU(cpumask_var_t, cpu_kick_mask); -__weak void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, - unsigned long start, unsigned long end) -{ -} - __weak void kvm_arch_guest_memory_reclaimed(struct kvm *kvm) { } @@ -521,18 +516,6 @@ static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) return container_of(mn, struct kvm, mmu_notifier); } -static void kvm_mmu_notifier_invalidate_range(struct mmu_notifier *mn, - struct mm_struct *mm, - unsigned long start, unsigned long end) -{ - struct kvm *kvm = mmu_notifier_to_kvm(mn); - int idx; - - idx = srcu_read_lock(&kvm->srcu); - kvm_arch_mmu_notifier_invalidate_range(kvm, start, end); - srcu_read_unlock(&kvm->srcu, idx); -} - typedef bool (*hva_handler_t)(struct kvm *kvm, struct kvm_gfn_range *range); typedef void (*on_lock_fn_t)(struct kvm *kvm, unsigned long start, @@ -892,7 +875,6 @@ static void kvm_mmu_notifier_release(struct mmu_notifier *mn, } static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { - .invalidate_range = kvm_mmu_notifier_invalidate_range, .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, .clear_flush_young = kvm_mmu_notifier_clear_flush_young, -- 2.7.4