KVM: VMX: Only reload guest msrs if they are already loaded
If we set an msr via an ioctl() instead of by handling a guest exit, we
have the host state loaded, so reloading the msrs would clobber host
state instead of guest state.
This fixes a host oops (and loss of a cpu) on a guest reboot.
Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 096cb6a..b353eaa 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -600,7 +600,8 @@
msr = find_msr_entry(vcpu, msr_index);
if (msr)
msr->data = data;
- load_msrs(vcpu->guest_msrs, NR_BAD_MSRS);
+ if (vcpu->vmx_host_state.loaded)
+ load_msrs(vcpu->guest_msrs, NR_BAD_MSRS);
break;
#endif
case MSR_IA32_SYSENTER_CS: