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 <sean.j.christopherson@intel.com>
Message-Id: <20200320212833.3507-26-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 85e17a0..575bd5d 100644 (file)
--- 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;
 }