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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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12
hw/intc/apic_common.c
View File

@ -294,11 +294,14 @@ static int apic_load_old(QEMUFile *f, void *opaque, int version_id)
return 0;
}
static const VMStateDescription vmstate_apic_common;
static void apic_common_realize(DeviceState *dev, Error **errp)
{
APICCommonState *s = APIC_COMMON(dev);
APICCommonClass *info;
static DeviceState *vapic;
int instance_id = s->id;
info = APIC_COMMON_GET_CLASS(s);
info->realize(dev, errp);
@ -313,6 +316,11 @@ static void apic_common_realize(DeviceState *dev, Error **errp)
info->enable_tpr_reporting(s, true);
}
if (s->legacy_instance_id) {
instance_id = -1;
}
vmstate_register_with_alias_id(NULL, instance_id, &vmstate_apic_common,
s, -1, 0);
}
static void apic_common_unrealize(DeviceState *dev, Error **errp)
@ -320,6 +328,7 @@ static void apic_common_unrealize(DeviceState *dev, Error **errp)
APICCommonState *s = APIC_COMMON(dev);
APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
vmstate_unregister(NULL, &vmstate_apic_common, s);
info->unrealize(dev, errp);
if (apic_report_tpr_access && info->enable_tpr_reporting) {
@ -422,6 +431,8 @@ static Property apic_properties_common[] = {
DEFINE_PROP_UINT8("version", APICCommonState, version, 0x14),
DEFINE_PROP_BIT("vapic", APICCommonState, vapic_control, VAPIC_ENABLE_BIT,
true),
DEFINE_PROP_BOOL("legacy-instance-id", APICCommonState, legacy_instance_id,
false),
DEFINE_PROP_END_OF_LIST(),
};
@ -429,7 +440,6 @@ static void apic_common_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->vmsd = &vmstate_apic_common;
dc->reset = apic_reset_common;
dc->props = apic_properties_common;
dc->realize = apic_common_realize;

1
include/hw/i386/apic_internal.h
View File

@ -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 {

5
include/hw/i386/pc.h
View File

@ -382,6 +382,11 @@ bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
.driver = TYPE_X86_CPU,\
.property = "fill-mtrr-mask",\
.value = "off",\
},\
{\
.driver = "apic",\
.property = "legacy-instance-id",\
.value = "on",\
},
#define PC_COMPAT_2_5 \