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x86: KVM: svm: don't pretend to advance RIP in case wrmsr_interception() results in #GP 

svm->next_rip is only used by skip_emulated_instruction() and in case
kvm_set_msr() fails we rightfully don't do that. Move svm->next_rip
advancement to 'else' branch to avoid creating false impression that
it's always advanced (and make it look like rdmsr_interception()).

This is a preparatory change to removing hardcoded RIP advancement
from instruction intercepts, no functional change.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2019-08-13 15:53:29 +02:00 committed by Paolo Bonzini
parent 016cd75964
commit 05402f6454
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/svm.c
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@ -4444,13 +4444,13 @@ static int wrmsr_interception(struct vcpu_svm *svm)
msr.index = ecx;
msr.host_initiated = false;
svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
if (kvm_set_msr(&svm->vcpu, &msr)) {
trace_kvm_msr_write_ex(ecx, data);
kvm_inject_gp(&svm->vcpu, 0);
return 1;
} else {
trace_kvm_msr_write(ecx, data);
svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
return kvm_skip_emulated_instruction(&svm->vcpu);
}
}