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KVM: x86: Defer MMU sync on PCID invalidation 

Defer the MMU sync on PCID invalidation so that multiple sync requests in
a single VM-Exit are batched.  This is a very minor optimization as
checking for unsync'd children is quite cheap.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210609234235.1244004-13-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-06-09 16:42:32 -07:00 committed by Paolo Bonzini
parent 39353ab579
commit e62f1aa8b9
1 changed files with 1 additions and 1 deletions
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arch/x86/kvm/x86.c
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@ -1074,7 +1074,7 @@ static void kvm_invalidate_pcid(struct kvm_vcpu *vcpu, unsigned long pcid)
* happen anyway before switching to any other CR3.
*/
if (kvm_get_active_pcid(vcpu) == pcid) {
kvm_mmu_sync_roots(vcpu);
kvm_make_request(KVM_REQ_MMU_SYNC, vcpu);
kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
}