[Qemu-devel] [PATCH] i386/kvm: Do not sync nested state during runtime

[Jan Kiszka]

Writing the nested state e.g. after a vmport access can invalidate
important parts of the kernel-internal state, and it is not needed as
well. So leave this out from KVM_PUT_RUNTIME_STATE.

Suggested-by: Paolo Bonzini <address@hidden>
Signed-off-by: Jan Kiszka <address@hidden>
---
 target/i386/kvm.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index ec7870c6af..da98b2cbca 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -3577,12 +3577,12 @@ int kvm_arch_put_registers(CPUState *cpu, int level)
 
     assert(cpu_is_stopped(cpu) || qemu_cpu_is_self(cpu));
 
-    ret = kvm_put_nested_state(x86_cpu);
-    if (ret < 0) {
-        return ret;
-    }
-
     if (level >= KVM_PUT_RESET_STATE) {
+        ret = kvm_put_nested_state(x86_cpu);
+        if (ret < 0) {
+            return ret;
+        }
+
         ret = kvm_put_msr_feature_control(x86_cpu);
         if (ret < 0) {
             return ret;
-- 
2.16.4