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esp: add vmstate_esp version to embedded ESPState 

The QOM object representing ESPState is currently embedded within both the
SYSBUS_ESP and PCI_ESP devices with migration state handled by embedding
vmstate_esp within each device using VMSTATE_STRUCT.

Since the vmstate_esp fields are embedded directly within the migration
stream, the incoming vmstate_esp version_id is lost. The only version information
available is that from vmstate_sysbus_esp_scsi and vmstate_esp_pci_scsi, but
those versions represent their respective devices and not that of the underlying
ESPState.

Resolve this by adding a new version-dependent field in vmstate_sysbus_esp_scsi
and vmstate_esp_pci_scsi which stores the vmstate_esp version_id field within
ESPState to be used to allow migration from older QEMU versions.

Finally bump the vmstate_esp version to 5 to cover the upcoming ESPState changes
within this patch series.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210304221103.6369-5-mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2021-03-04 22:10:25 +00:00
parent eb169c76d0
commit 0bd005be78
3 changed files with 25 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
hw/scsi/esp-pci.c
View File

@ -330,11 +330,12 @@ static void esp_pci_hard_reset(DeviceState *dev)
static const VMStateDescription vmstate_esp_pci_scsi = {
.name = "pciespscsi",
.version_id = 1,
.version_id = 2,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_PCI_DEVICE(parent_obj, PCIESPState),
VMSTATE_BUFFER_UNSAFE(dma_regs, PCIESPState, 0, 8 * sizeof(uint32_t)),
VMSTATE_UINT8_V(esp.mig_version_id, PCIESPState, 2),
VMSTATE_STRUCT(esp, PCIESPState, 0, vmstate_esp, ESPState),
VMSTATE_END_OF_LIST()
}

23
hw/scsi/esp.c
View File

@ -795,10 +795,28 @@ static const VMStateDescription vmstate_esp_pdma = {
}
};
static int esp_pre_save(void *opaque)
{
ESPState *s = ESP(opaque);
s->mig_version_id = vmstate_esp.version_id;
return 0;
}
static int esp_post_load(void *opaque, int version_id)
{
ESPState *s = ESP(opaque);
s->mig_version_id = vmstate_esp.version_id;
return 0;
}
const VMStateDescription vmstate_esp = {
.name = "esp",
.version_id = 4,
.version_id = 5,
.minimum_version_id = 3,
.pre_save = esp_pre_save,
.post_load = esp_post_load,
.fields = (VMStateField[]) {
VMSTATE_BUFFER(rregs, ESPState),
VMSTATE_BUFFER(wregs, ESPState),
@ -997,9 +1015,10 @@ static void sysbus_esp_init(Object *obj)
static const VMStateDescription vmstate_sysbus_esp_scsi = {
.name = "sysbusespscsi",
.version_id = 1,
.version_id = 2,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT8_V(esp.mig_version_id, SysBusESPState, 2),
VMSTATE_STRUCT(esp, SysBusESPState, 0, vmstate_esp, ESPState),
VMSTATE_END_OF_LIST()
}

2
include/hw/scsi/esp.h
View File

@ -68,6 +68,8 @@ struct ESPState {
uint32_t pdma_start;
uint32_t pdma_cur;
void (*pdma_cb)(ESPState *s);
uint8_t mig_version_id;
};
#define TYPE_SYSBUS_ESP "sysbus-esp"