Commit 8c8560b8 authored by Sean Christopherson's avatar Sean Christopherson Committed by Paolo Bonzini
Browse files

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: default avatarSean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200320212833.3507-26-sean.j.christopherson@intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent eeeb4f67

arch/x86/kvm/mmu/mmu.c

+6 −6
Original line number Diff line number Diff line
@@ -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;

}

CRA Git | Maintained and supported by SUSTech CRA and CCSE