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From 9e78c7b16a7d6ce25cbf40affbc309b90b913a2b Mon Sep 17 00:00:00 2001
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From: Miroslav Rezanina <mrezanin@redhat.com>
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Date: Wed, 31 Jul 2013 08:01:44 +0200
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Subject: qemu-kvm: Fix migration from older version due to i8254 changes
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Message-id: <1375201922-6794-2-git-send-email-armbru@redhat.com>
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Patchwork-id: 52815
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O-Subject: [RHEL-7 PATCH v3 01/15] qemu-kvm: Fix migration from older version due to i8254 changes
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Bugzilla: 983991
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Bandan Das <bsd@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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Old qemu-kvm already contained an equivalent field to i8254's
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irq_disabled. We therefore have to remove upstream's version restriction
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here to allow migration from older versions.
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Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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Signed-off-by: Avi Kivity <avi@redhat.com>
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(cherry picked from commit 81bdec908fb2be0ccaff1d4ee67956c509e440ad)
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Conflicts:
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hw/i8254.c
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Picked from qemu-kvm-1.1.
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qemu-kvm-0.11.0 commit f69b3e2 added PITState member flags, added it
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to migration section "i8254", and bumped its version to 2.
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qemu v0.12.0 commit 5122b43 ported i8254 to VMState, and also bumped
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section version to 2. Version 2 now means different things in qemu
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and qemu-kvm.
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This got merged into qemu-kvm-0.12.0 in commit f4f2edc. The merge
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added migration of flags to qemu's code. Yet another version of
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version 2. This is what we got in RHEL-6.
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qemu v1.1.0 commit ce967e2 added PITState member irq_disabled,
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included it in migration section "i8254", and bumped its version to 3.
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Because qemu's irq_disabled is compatible with qemu-kvm's flags,
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qemu's version 3 is migration compatible with the latest instance of
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qemu-kvm's version 2.
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When this got merged into qemu-kvm-1.1.0, it changed qemu-kvm's
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version 2 to no longer include flags / irq_disabled. Commit 81bdec9
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reverted the change of version 2.
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We need to do the same to enable incoming migration from RHEL-6.
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Signed-off-by: Markus Armbruster <armbru@redhat.com>
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diff --git a/hw/timer/i8254_common.c b/hw/timer/i8254_common.c
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index 07345f6..649c7ee 100644
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--- a/hw/timer/i8254_common.c
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+++ b/hw/timer/i8254_common.c
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@@ -266,7 +266,7 @@ static const VMStateDescription vmstate_pit_common = {
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.pre_save = pit_dispatch_pre_save,
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.post_load = pit_dispatch_post_load,
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.fields = (VMStateField[]) {
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- VMSTATE_UINT32_V(channels[0].irq_disabled, PITCommonState, 3),
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+ VMSTATE_UINT32(channels[0].irq_disabled, PITCommonState), /* qemu-kvm's v2 had 'flags' here */
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VMSTATE_STRUCT_ARRAY(channels, PITCommonState, 3, 2,
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vmstate_pit_channel, PITChannelState),
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VMSTATE_INT64(channels[0].next_transition_time,
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