KVM: Protect update_cr8_intercept() when running without an apic

update_cr8_intercept() can be triggered from userspace while there
is no apic present.

Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 59a8ba4d56bd..35e7fc54de35 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3500,6 +3500,9 @@ static void update_cr8_intercept(struct kvm_vcpu *vcpu)
         if (!kvm_x86_ops->update_cr8_intercept)
                 return;
 
+        if (!vcpu->arch.apic)
+                return;
+
         if (!vcpu->arch.apic->vapic_addr)
                 max_irr = kvm_lapic_find_highest_irr(vcpu);
         else