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migration: Add last stage indicator to global dirty log

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The global dirty log synchronization is used when KVM and dirty ring
are enabled. There is a particularity for ARM64 where the backup
bitmap is used to track dirty pages in non-running-vcpu situations.
It means the dirty ring works with the combination of ring buffer
and backup bitmap. The dirty bits in the backup bitmap needs to
collected in the last stage of live migration.

In order to identify the last stage of live migration and pass it
down, an extra parameter is added to the relevant functions and
callbacks. This last stage indicator isn't used until the dirty
ring is enabled in the subsequent patches.

No functional change intended.

Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Tested-by: Zhenyu Zhang <zhenyzha@redhat.com>
Message-Id: <20230509022122.20888-2-gshan@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Gavin Shan 2023-05-09 12:21:19 +10:00 • committed by Paolo Bonzini
parent ed8d95182b
commit 1e493be587
5 changed files with 25 additions and 20 deletions
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2
accel/kvm/kvm-all.c
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@ -1563,7 +1563,7 @@ static void kvm_log_sync(MemoryListener *listener,
kvm_slots_unlock();
}
static void kvm_log_sync_global(MemoryListener *l)
static void kvm_log_sync_global(MemoryListener *l, bool last_stage)
{
KVMMemoryListener *kml = container_of(l, KVMMemoryListener, listener);
KVMState *s = kvm_state;