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virtio-gpu: fix v2 migration

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Commit dfcf74fa ("virtio-gpu: fix scanout migration post-load") broke
forward/backward version migration. Versioning of nested VMSD structures
is not straightforward, as the wire format doesn't have nested
structures versions. Introduce x-scanout-vmstate-version and a field
test to save/load appropriately according to the machine version.

Fixes: dfcf74fa ("virtio-gpu: fix scanout migration post-load")
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Fiona Ebner <f.ebner@proxmox.com>
Tested-by: Fiona Ebner <f.ebner@proxmox.com>
[fixed long lines]
Signed-off-by: Fabiano Rosas <farosas@suse.de>
This commit is contained in:
Marc-André Lureau 2024-05-16 12:40:22 +04:00 • committed by Fabiano Rosas
parent f0937ec669
commit 40a23ef643
3 changed files with 24 additions and 8 deletions
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hw/core/machine.c
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@ -42,6 +42,7 @@ GlobalProperty hw_compat_8_2[] = {
{ "migration", "zero-page-detection", "legacy"},
{ TYPE_VIRTIO_IOMMU_PCI, "granule", "4k" },
{ TYPE_VIRTIO_IOMMU_PCI, "aw-bits", "64" },
{ "virtio-gpu-device", "x-scanout-vmstate-version", "1" },
};
const size_t hw_compat_8_2_len = G_N_ELEMENTS(hw_compat_8_2);