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From e1f0936bbf84664d7d7fe7bbbdd1595be745b539 Mon Sep 17 00:00:00 2001
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From: Cole Robinson <crobinso@redhat.com>
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Date: Tue, 19 Feb 2013 15:04:59 -0500
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Subject: [PATCH] i8254: Fix migration from qemu-kvm < 1.1
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qemu-kvm commit 81bdec908fb2be0ccaff1d4ee67956c509e440ad did this,
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but the logic can't be carried unconditionally in qemu.git without
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breaking migration from qemu < 1.1.
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Conditionalize it with --enable-migrate-from-qemu-kvm
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---
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hw/timer/i8254_common.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/hw/timer/i8254_common.c b/hw/timer/i8254_common.c
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index 5342df4..e74afe3 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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@@ -275,7 +275,15 @@ 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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+#ifdef CONFIG_MIGRATE_FROM_QEMU_KVM
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+ /* qemu-kvm version_id=2 had 'flags' here which is equivalent
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+ * This fixes incoming migration from qemu-kvm 1.0, but breaks
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+ * incoming migration from qemu < 1.1
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+ */
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+ VMSTATE_UINT32(channels[0].irq_disabled, PITCommonState),
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+#else
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VMSTATE_UINT32_V(channels[0].irq_disabled, PITCommonState, 3),
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+#endif
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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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