Commit 14072e56 authored by Sean Christopherson's avatar Sean Christopherson Committed by Paolo Bonzini
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KVM: VMX: Skip additional Hyper-V TLB EPTP flushes if one fails 



Skip additional EPTP flushes if one fails when processing EPTPs for
Hyper-V's paravirt TLB flushing.  If _any_ flush fails, KVM falls back
to a full global flush, i.e. additional flushes are unnecessary (and
will likely fail anyways).

Continue processing the loop unless a mismatch was already detected,
e.g. to handle the case where the first flush fails and there is a
yet-to-be-detected mismatch.

Reviewed-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarSean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
Message-Id: <20210305183123.3978098-11-seanjc@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent ee36656f

arch/x86/kvm/vmx/vmx.c

+9 −1
Original line number Diff line number Diff line
@@ -528,7 +528,15 @@ static int hv_remote_flush_tlb_with_range(struct kvm *kvm, 
			if (++nr_unique_valid_eptps == 1)

				kvm_vmx->hv_tlb_eptp = tmp_eptp;



			ret |= hv_remote_flush_eptp(tmp_eptp, range);

			if (!ret)

				ret = hv_remote_flush_eptp(tmp_eptp, range);



			/*

			 * Stop processing EPTPs if a failure occurred and

			 * there is already a detected EPTP mismatch.

			 */

			if (ret && nr_unique_valid_eptps > 1)

				break;

		}



		/*