kvm: Add missing bits to support live migration

This patch adds the missing hooks to allow live migration in KVM mode.
It adds proper synchronization before/after saving/restoring the VCPU
states (note: PPC is untested), hooks into
cpu_physical_memory_set_dirty_tracking() to enable dirty memory logging
at KVM level, and synchronizes that drity log into QEMU's view before
running ram_live_save().

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/exec.c b/exec.c
index 544fb43074..723de89bf4 100644
--- a/exec.c
+++ b/exec.c
@@ -516,6 +516,8 @@ static void cpu_common_save(QEMUFile *f, void *opaque)
 {
     CPUState *env = opaque;
 
+    cpu_synchronize_state(env, 0);
+
     qemu_put_be32s(f, &env->halted);
     qemu_put_be32s(f, &env->interrupt_request);
 }
@@ -533,6 +535,7 @@ static int cpu_common_load(QEMUFile *f, void *opaque, int version_id)
        version_id is increased. */
     env->interrupt_request &= ~0x01;
     tlb_flush(env, 1);
+    cpu_synchronize_state(env, 1);
 
     return 0;
 }
@@ -1923,6 +1926,9 @@ void cpu_physical_memory_reset_dirty(ram_addr_t start, ram_addr_t end,
 int cpu_physical_memory_set_dirty_tracking(int enable)
 {
     in_migration = enable;
+    if (kvm_enabled()) {
+        return kvm_set_migration_log(enable);
+    }
     return 0;
 }