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From 7544abf3b783fc82b031d40d0685d2047709492a Mon Sep 17 00:00:00 2001
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From: Jason Baron <jbaron@redhat.com>
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Date: Wed, 8 Aug 2012 14:29:12 -0400
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Subject: [PATCH] pcie: drop version_id field for live migration
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While testing q35 live migration, I found that the migration would abort with
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the following error: "Unknown savevm section type 76".
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The error is due to this check failing in 'vmstate_load_state()':
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while(field->name) {
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if ((field->field_exists &&
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field->field_exists(opaque, version_id)) ||
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(!field->field_exists &&
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field->version_id <= version_id)) {
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The VMSTATE_PCIE_DEVICE() currently has a 'version_id' set to 2. However,
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'version_id' in the above check is 1. And thus we fail to load the pcie device
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field. Further the code returns to 'qemu_loadvm_state()' which produces the
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error that I saw.
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I'm proposing to fix this by simply dropping the 'version_id' field from
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VMSTATE_PCIE_DEVICE(). VMSTATE_PCI_DEVICE() defines no such field and further
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the vmstate_pcie_device that VMSTATE_PCI_DEVICE() refers to is already
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versioned. Thus, any versioning issues could be detected at the vmsd level.
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Taking a step back, I think that the 'field->version_id' should be compared
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against a saved version number for the field not the 'version_id'. Futhermore,
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once vmstate_load_state() is called recursively on another vmsd, the check of:
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if (version_id > vmsd->version_id) {
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return -EINVAL;
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}
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Will never fail since version_id is always equal to vmsd->version_id. So I'm
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wondering why we aren't storing the vmsd version id of the source in the
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migration stream?
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This patch also renames the 'name' field of vmstate_pcie_device from:
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PCIDevice -> PCIEDevice to differentiate it from vmstate_pci_device.
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Signed-off-by: Jason Baron <jbaron@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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(cherry picked from commit 1de53459272d89c52bb21b45d5d970de40fbb642)
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Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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---
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hw/pci.c | 2 +-
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hw/pcie.h | 1 -
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2 files changed, 1 insertion(+), 2 deletions(-)
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diff --git a/hw/pci.c b/hw/pci.c
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index 4d95984..f855cf3 100644
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--- a/hw/pci.c
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+++ b/hw/pci.c
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@@ -439,7 +439,7 @@ const VMStateDescription vmstate_pci_device = {
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};
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const VMStateDescription vmstate_pcie_device = {
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- .name = "PCIDevice",
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+ .name = "PCIEDevice",
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.version_id = 2,
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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diff --git a/hw/pcie.h b/hw/pcie.h
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index b8ab0c7..4889194 100644
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--- a/hw/pcie.h
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+++ b/hw/pcie.h
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@@ -133,7 +133,6 @@ extern const VMStateDescription vmstate_pcie_device;
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#define VMSTATE_PCIE_DEVICE(_field, _state) { \
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.name = (stringify(_field)), \
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- .version_id = 2, \
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.size = sizeof(PCIDevice), \
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.vmsd = &vmstate_pcie_device, \
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.flags = VMS_STRUCT, \
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--
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1.8.0.2
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