[Qemu-devel] [PULL 09/12] target/i386: kvm: Fix when nested state is needed for migration

[Paolo Bonzini]

From: Liran Alon <address@hidden>

When vCPU is in VMX operation and enters SMM mode,
it temporarily exits VMX operation but KVM maintained nested-state
still stores the VMXON region physical address, i.e. even when the
vCPU is in SMM mode then (nested_state->hdr.vmx.vmxon_pa != -1ull).

Therefore, there is no need to explicitly check for
KVM_STATE_NESTED_SMM_VMXON to determine if it is necessary
to save nested-state as part of migration stream.

Reviewed-by: Karl Heubaum <address@hidden>
Signed-off-by: Liran Alon <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
 target/i386/machine.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/target/i386/machine.c b/target/i386/machine.c
index 851b249..704ba6d 100644
--- a/target/i386/machine.c
+++ b/target/i386/machine.c
@@ -997,9 +997,8 @@ static bool vmx_nested_state_needed(void *opaque)
 {
     struct kvm_nested_state *nested_state = opaque;
 
-    return ((nested_state->format == KVM_STATE_NESTED_FORMAT_VMX) &&
-            ((nested_state->hdr.vmx.vmxon_pa != -1ull) ||
-             (nested_state->hdr.vmx.smm.flags & KVM_STATE_NESTED_SMM_VMXON)));
+    return (nested_state->format == KVM_STATE_NESTED_FORMAT_VMX &&
+            nested_state->hdr.vmx.vmxon_pa != -1ull);
 }
 
 static const VMStateDescription vmstate_vmx_nested_state = {
-- 
1.8.3.1