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apic: Use apic_id as apic's migration instance_id

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instance_id is generated by last_used_id + 1 for a given device type
so for QEMU with 3 CPUs instance_id for APICs is a seti of [0, 1, 2]
When CPU in the middle is hot-removed and migration started
APICs with instance_ids 0 and 2 are transferred in migration stream.
However target starts with 2 CPUs and APICs' instance_ids are
generated from scratch [0, 1] hence migration fails with error
  Unknown savevm section or instance 'apic' 2

Fix issue by manually registering APIC's vmsd with apic_id as
instance_id, in this case instance_id on target will always
match instance_id on source as apic_id is the same for a given
cpu instance.

Reported-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Igor Mammedov 2016-07-01 17:53:56 +02:00 • committed by Eduardo Habkost
parent 9c156f9de5
commit f6e984443f
3 changed files with 17 additions and 1 deletions
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1
include/hw/i386/apic_internal.h
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@ -183,6 +183,7 @@ struct APICCommonState {
uint32_t vapic_control;
DeviceState *vapic;
hwaddr vapic_paddr; /* note: persistence via kvmvapic */
bool legacy_instance_id;
};
typedef struct VAPICState {