[Qemu-devel] [PATCH 08/35] Synchronize VCPU states before reset

[Marcelo Tosatti <mtosatti@redhat.com>]

From: Jan Kiszka <jan.kiszka@siemens.com>

This is required to support keeping VCPU states across a system reset.
If we do not read the current state before the reset,
cpu_synchronize_all_post_reset may write back incorrect state
information.

The first user of this will be MCE MSR synchronization which currently
works around the missing cpu_synchronize_all_states.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---
 vl.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/vl.c b/vl.c
index 5e007a7..f4c24d3 100644
--- a/vl.c
+++ b/vl.c
@@ -1450,6 +1450,7 @@ static void main_loop(void)
         }
         if (qemu_reset_requested()) {
             pause_all_vcpus();
+            cpu_synchronize_all_states();
             qemu_system_reset();
             resume_all_vcpus();
         }
-- 
1.7.4