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hw/isa/piix4: Migrate Reset Control Register

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When adding the Reset register in commit 5790b757cf we
forgot to migrate it.

While it is possible a VM using the PIIX4 is migrated just
after requesting a system shutdown, it is very unlikely.
However when restoring a migrated VM, we might have the
RCR bit #4 set on the stack and when the VM resume it
directly shutdowns.

Add a post_load() migration handler and set the default
RCR value to 0 for earlier versions, assuming the VM was
not going to shutdown before migration.

Fixes: 5790b757cf ("piix4: Add the Reset Control Register")
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20210324200334.729899-1-f4bug@amsat.org>
This commit is contained in:
Philippe Mathieu-Daudé 2021-03-24 14:54:43 +01:00
parent 50fab4cc67
commit 62271205bc
1 changed files with 14 additions and 1 deletions
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15
hw/isa/piix4.c
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@ -93,12 +93,25 @@ static void piix4_isa_reset(DeviceState *dev)
pci_conf[0xae] = 0x00;
}
static int piix4_ide_post_load(void *opaque, int version_id)
{
PIIX4State *s = opaque;
if (version_id == 2) {
s->rcr = 0;
}
return 0;
}
static const VMStateDescription vmstate_piix4 = {
.name = "PIIX4",
.version_id = 2,
.version_id = 3,
.minimum_version_id = 2,
.post_load = piix4_ide_post_load,
.fields = (VMStateField[]) {
VMSTATE_PCI_DEVICE(dev, PIIX4State),
VMSTATE_UINT8_V(rcr, PIIX4State, 3),
VMSTATE_END_OF_LIST()
}
};