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[Qemu-devel] [PATCH v4 12/16] apic: use apic_id as apic's migration inst
From: |
Igor Mammedov |
Subject: |
[Qemu-devel] [PATCH v4 12/16] apic: use apic_id as apic's migration instance_id |
Date: |
Thu, 14 Jul 2016 18:54:41 +0200 |
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 <address@hidden>
Signed-off-by: Igor Mammedov <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
---
CC: address@hidden
---
include/hw/i386/apic_internal.h | 1 +
include/hw/i386/pc.h | 5 +++++
hw/intc/apic_common.c | 12 +++++++++++-
3 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/include/hw/i386/apic_internal.h b/include/hw/i386/apic_internal.h
index e549a62..06c4e9f 100644
--- a/include/hw/i386/apic_internal.h
+++ b/include/hw/i386/apic_internal.h
@@ -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 {
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 7d9d03c..dc82e29 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -378,6 +378,11 @@ 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 \
diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c
index 0bb9ad5..14ac43c 100644
--- a/hw/intc/apic_common.c
+++ b/hw/intc/apic_common.c
@@ -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;
--
2.7.4
- [Qemu-devel] [PATCH v4 06/16] pc: cpu: allow device_add to be used with x86 cpu, (continued)
- [Qemu-devel] [PATCH v4 06/16] pc: cpu: allow device_add to be used with x86 cpu, Igor Mammedov, 2016/07/14
- [Qemu-devel] [PATCH v4 07/16] pc: implement query-hotpluggable-cpus callback, Igor Mammedov, 2016/07/14
- [Qemu-devel] [PATCH v4 09/16] apic: drop APICCommonState.idx and use APIC ID as index in local_apics[], Igor Mammedov, 2016/07/14
- [Qemu-devel] [PATCH v4 08/16] apic: move MAX_APICS check to 'apic' class, Igor Mammedov, 2016/07/14
- [Qemu-devel] [PATCH v4 11/16] (kvm)apic: add unrealize callbacks, Igor Mammedov, 2016/07/14
- [Qemu-devel] [PATCH v4 10/16] apic: kvm-apic: fix crash due to access to freed memory region, Igor Mammedov, 2016/07/14
- [Qemu-devel] [PATCH v4 13/16] target-i386: cpu: do not ignore error and fix apic parent, Igor Mammedov, 2016/07/14
- [Qemu-devel] [PATCH v4 12/16] apic: use apic_id as apic's migration instance_id,
Igor Mammedov <=
- [Qemu-devel] [PATCH v4 14/16] target-i386: fix apic object leak when CPU is deleted, Igor Mammedov, 2016/07/14
- [Qemu-devel] [PATCH v4 15/16] target-i386: add x86_cpu_unrealizefn(), Igor Mammedov, 2016/07/14
- [Qemu-devel] [PATCH v4 16/16] pc: make device_del CPU work for x86 CPUs, Igor Mammedov, 2016/07/14
- Re: [Qemu-devel] [PATCH v4 00/16] pc: add CPU hot-add/hot-remove with device_add/device_del, Michael S. Tsirkin, 2016/07/18