KVM: SVM: Don't rewrite guest ICR on AVIC IPI virtualization failure

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Don't bother rewriting the ICR value into the vAPIC page on an AVIC IPI
virtualization failure, the access is a trap, i.e. the value has already
been written to the vAPIC page.  The one caveat is if hardware left the
BUSY flag set (which appears to happen somewhat arbitrarily), in which
case go through the "nodecode" APIC-write path in order to clear the BUSY
flag.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220204214205.3306634-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2022-02-04 21:41:59 +00:00 • committed by Paolo Bonzini

parent ed60920efe

commit b51818afdc

2 changed files with 12 additions and 11 deletions

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1

arch/x86/kvm/lapic.c

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22

arch/x86/kvm/svm/avic.c

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