KVM: VMX: Check for automatic switch msr table overflow
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 98f4b0b..579a0b5 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1280,7 +1280,11 @@
if (m->guest[i].index == msr)
break;
- if (i == m->nr) {
+ if (i == NR_AUTOLOAD_MSRS) {
+ printk_once(KERN_WARNING"Not enough mst switch entries. "
+ "Can't add msr %x\n", msr);
+ return;
+ } else if (i == m->nr) {
++m->nr;
vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr);
vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr);