KVM: Fix MAXPHYADDR calculation when cpuid does not support it

Commit Message

Avi Kivity April 11, 2010, 12:33 p.m. UTC

None

Patch

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index fd5c3d3..b2460cd 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4165,9 +4165,13 @@  int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
 {
 	struct kvm_cpuid_entry2 *best;
 
+	best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0);
+	if (!best || best->eax < 0x80000008)
+		goto not_found;
 	best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
 	if (best)
 		return best->eax & 0xff;
+not_found:
 	return 36;
 }