From 8c8560b833909cbf2e3a73d4dc8e65a60ba66f07 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Fri, 20 Mar 2020 14:28:21 -0700 Subject: [PATCH] KVM: x86/mmu: Use KVM_REQ_TLB_FLUSH_CURRENT for MMU specific flushes Flush only the current ASID/context when requesting a TLB flush due to a change in the current vCPU's MMU to avoid blasting away TLB entries associated with other ASIDs/contexts, e.g. entries cached for L1 when a change in L2's MMU requires a flush. Signed-off-by: Sean Christopherson Message-Id: <20200320212833.3507-26-sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/mmu/mmu.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 85e17a0..575bd5d 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -2309,7 +2309,7 @@ static void kvm_mmu_flush_or_zap(struct kvm_vcpu *vcpu, return; if (local_flush) - kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); + kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); } #ifdef CONFIG_KVM_MMU_AUDIT @@ -2516,11 +2516,11 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, break; WARN_ON(!list_empty(&invalid_list)); - kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); + kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); } if (sp->unsync_children) - kvm_make_request(KVM_REQ_MMU_SYNC, vcpu); + kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); __clear_sp_write_flooding_count(sp); trace_kvm_mmu_get_page(sp, false); @@ -3121,7 +3121,7 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, if (set_spte_ret & SET_SPTE_WRITE_PROTECTED_PT) { if (write_fault) ret = RET_PF_EMULATE; - kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); + kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); } if (set_spte_ret & SET_SPTE_NEED_REMOTE_TLB_FLUSH || flush) @@ -4310,7 +4310,7 @@ static bool fast_cr3_switch(struct kvm_vcpu *vcpu, gpa_t new_cr3, kvm_make_request(KVM_REQ_LOAD_MMU_PGD, vcpu); if (!skip_tlb_flush) { kvm_make_request(KVM_REQ_MMU_SYNC, vcpu); - kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); + kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); } /* @@ -5179,7 +5179,7 @@ int kvm_mmu_load(struct kvm_vcpu *vcpu) if (r) goto out; kvm_mmu_load_pgd(vcpu); - kvm_x86_ops.tlb_flush_all(vcpu); + kvm_x86_ops.tlb_flush_current(vcpu); out: return r; } -- 2.7.4