[Bug 206579] KVM with passthrough generates "BUG: kernel NULL pointer dereference" and crashes

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=206579

--- Comment #43 from Paolo Bonzini (bonzini@gnu.org) ---
Hey, this should fix the warning (not sure because it's untested and I'd wait
for Suravee to confirm it's the intended behavior):

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index b51b362a9736..81c2cfa96b69 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2162,6 +2162,9 @@ static void avic_set_running(struct kvm_vcpu *vcpu, bool
is_run)
 {
        struct vcpu_svm *svm = to_svm(vcpu);

+       if (svm->avic_is_running == is_run)
+               return;
+
        svm->avic_is_running = is_run;
        if (is_run)
                avic_vcpu_load(vcpu, vcpu->cpu);

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