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https://gitlab.com/qemu-project/qemu
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a83c284490
vmstate_acpi_pcihp_use_acpi_index() was expecting AcpiPciHpState
as state but it actually received PIIX4PMState, because
VMSTATE_PCI_HOTPLUG is a macro and not another struct.
So it ended up accessing random pointer, which resulted
in 'false' return value and acpi_index field wasn't ever
sent.
However in 7.0 that pointer de-references to value > 0, and
destination QEMU starts to expect the field which isn't
sent in migratioon stream from older QEMU (6.2 and older).
As result migration fails with:
qemu-system-x86_64: Missing section footer for 0000:00:01.3/piix4_pm
qemu-system-x86_64: load of migration failed: Invalid argument
In addition with QEMU-6.2, destination due to not expected
state, also never expects the acpi_index field in migration
stream.
Q35 is not affected as it always sends/expects the field as
long as acpi based PCI hotplug is enabled.
Fix issue by introducing compat knob to never send/expect
acpi_index in migration stream for 6.2 and older PC machine
types and always send it for 7.0 and newer PC machine types.
Diagnosed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Fixes: b32bd76 ("pci: introduce acpi-index property for PCI device")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/932
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
#include "qemu/osdep.h"
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#include "hw/acpi/pcihp.h"
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#include "migration/vmstate.h"
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const VMStateDescription vmstate_acpi_pcihp_pci_status;
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void acpi_pcihp_init(Object *owner, AcpiPciHpState *s, PCIBus *root_bus,
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MemoryRegion *address_space_io, bool bridges_enabled,
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uint16_t io_base)
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{
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return;
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}
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void acpi_pcihp_device_plug_cb(HotplugHandler *hotplug_dev, AcpiPciHpState *s,
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DeviceState *dev, Error **errp)
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{
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return;
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}
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void acpi_pcihp_device_pre_plug_cb(HotplugHandler *hotplug_dev,
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DeviceState *dev, Error **errp)
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{
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return;
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}
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void acpi_pcihp_device_unplug_cb(HotplugHandler *hotplug_dev, AcpiPciHpState *s,
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DeviceState *dev, Error **errp)
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{
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return;
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}
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void acpi_pcihp_device_unplug_request_cb(HotplugHandler *hotplug_dev,
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AcpiPciHpState *s, DeviceState *dev,
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Error **errp)
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{
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return;
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}
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void acpi_pcihp_reset(AcpiPciHpState *s, bool acpihp_root_off)
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{
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return;
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}
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