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From 0d5a09173eb75b7e56122c2aefb2646a2be58400 Mon Sep 17 00:00:00 2001
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From: Peter Xu <peterx@redhat.com>
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Date: Fri, 31 Jan 2020 17:12:57 +0000
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Subject: [PATCH 15/15] apic: Use 32bit APIC ID for migration instance ID
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RH-Author: Peter Xu <peterx@redhat.com>
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Message-id: <20200131171257.1066593-4-peterx@redhat.com>
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Patchwork-id: 93628
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O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH 3/3] apic: Use 32bit APIC ID for migration instance ID
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Bugzilla: 1529231
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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RH-Acked-by: Juan Quintela <quintela@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Migration is silently broken now with x2apic config like this:
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-smp 200,maxcpus=288,sockets=2,cores=72,threads=2 \
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-device intel-iommu,intremap=on,eim=on
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After migration, the guest kernel could hang at anything, due to
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x2apic bit not migrated correctly in IA32_APIC_BASE on some vcpus, so
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any operations related to x2apic could be broken then (e.g., RDMSR on
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x2apic MSRs could fail because KVM would think that the vcpu hasn't
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enabled x2apic at all).
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The issue is that the x2apic bit was never applied correctly for vcpus
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whose ID > 255 when migrate completes, and that's because when we
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migrate APIC we use the APICCommonState.id as instance ID of the
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migration stream, while that's too short for x2apic.
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Let's use the newly introduced initial_apic_id for that.
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Signed-off-by: Peter Xu <peterx@redhat.com>
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Reviewed-by: Juan Quintela <quintela@redhat.com>
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Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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(cherry picked from commit 0ab994867c365db21e15f9503922c79234d8e40e)
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Signed-off-by: Peter Xu <peterx@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/intc/apic_common.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c
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index 54b8731..b5dbeb6 100644
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--- a/hw/intc/apic_common.c
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+++ b/hw/intc/apic_common.c
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@@ -268,7 +268,10 @@ static void apic_common_realize(DeviceState *dev, Error **errp)
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APICCommonState *s = APIC_COMMON(dev);
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APICCommonClass *info;
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static DeviceState *vapic;
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- uint32_t instance_id = s->id;
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+ uint32_t instance_id = s->initial_apic_id;
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+
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+ /* Normally initial APIC ID should be no more than hundreds */
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+ assert(instance_id != VMSTATE_INSTANCE_ID_ANY);
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info = APIC_COMMON_GET_CLASS(s);
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info->realize(dev, errp);
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--
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1.8.3.1
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