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KVM: VMX: Skip additional Hyper-V TLB EPTP flushes if one fails

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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: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210305183123.3978098-11-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-03-05 10:31:22 -08:00 committed by Paolo Bonzini
parent ee36656f0a
commit 14072e5695
1 changed files with 9 additions and 1 deletions
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10
arch/x86/kvm/vmx/vmx.c
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@ -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;
}
/*