[PATCH V1 10/32] kvmclock: restore paused KVM clock

[Steve Sistare]

If the VM is paused when the KVM clock is serialized to a file, record
that the clock is valid, so the value will be reused rather than
overwritten after cprload with a new call to KVM_GET_CLOCK here:

kvmclock_vm_state_change()
    if (running)
        ...
    else
        if (s->clock_valid)
            return;         <-- instead, return here

        kvm_update_clock()
           kvm_vm_ioctl(kvm_state, KVM_GET_CLOCK, &data)  <-- overwritten

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 hw/i386/kvm/clock.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/hw/i386/kvm/clock.c b/hw/i386/kvm/clock.c
index 6428335..161991a 100644
--- a/hw/i386/kvm/clock.c
+++ b/hw/i386/kvm/clock.c
@@ -285,18 +285,22 @@ static int kvmclock_pre_save(void *opaque)
     if (!s->runstate_paused) {
         kvm_update_clock(s);
     }
+    if (!runstate_is_running()) {
+        s->clock_valid = true;
+    }
 
     return 0;
 }
 
 static const VMStateDescription kvmclock_vmsd = {
     .name = "kvmclock",
-    .version_id = 1,
+    .version_id = 2,
     .minimum_version_id = 1,
     .pre_load = kvmclock_pre_load,
     .pre_save = kvmclock_pre_save,
     .fields = (VMStateField[]) {
         VMSTATE_UINT64(clock, KVMClockState),
+        VMSTATE_BOOL_V(clock_valid, KVMClockState, 2),
         VMSTATE_END_OF_LIST()
     },
     .subsections = (const VMStateDescription * []) {
-- 
1.8.3.1