[PATCH] target/i386/kvm: call kvm_put_vcpu_events() before kvm_put_nested_state()

[Eiichi Tsukata <eiichi.tsukata@xxxxxxxxxxx>]

kvm_put_vcpu_events() needs to be called before kvm_put_nested_state()
because vCPU's hflag is referred in KVM vmx_get_nested_state()
validation. Otherwise kvm_put_nested_state() can fail with -EINVAL when
a vCPU is in VMX operation and enters SMM mode. This leads to live
migration failure.

Signed-off-by: Eiichi Tsukata <eiichi.tsukata@xxxxxxxxxxx>
---
 target/i386/kvm/kvm.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index e7c054cc16..cd635c9142 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -4741,6 +4741,15 @@ int kvm_arch_put_registers(CPUState *cpu, int level)
         return ret;
     }
 
+    /*
+     * must be before kvm_put_nested_state so that HF_SMM_MASK is set during
+     * SMM.
+     */
+    ret = kvm_put_vcpu_events(x86_cpu, level);
+    if (ret < 0) {
+        return ret;
+    }
+
     if (level >= KVM_PUT_RESET_STATE) {
         ret = kvm_put_nested_state(x86_cpu);
         if (ret < 0) {
@@ -4787,10 +4796,6 @@ int kvm_arch_put_registers(CPUState *cpu, int level)
     if (ret < 0) {
         return ret;
     }
-    ret = kvm_put_vcpu_events(x86_cpu, level);
-    if (ret < 0) {
-        return ret;
-    }
     if (level >= KVM_PUT_RESET_STATE) {
         ret = kvm_put_mp_state(x86_cpu);
         if (ret < 0) {
-- 
2.41.0