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vfio: Add save and load functions for VFIO PCI devices 

Added functions to save and restore PCI device specific data,
specifically config space of PCI device.

Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
Reviewed-by: Neo Jia <cjia@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Kirti Wankhede 2020-10-26 15:06:13 +05:30 committed by Alex Williamson
parent e93b733bcf
commit c5e2fb3ce4
2 changed files with 53 additions and 0 deletions
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51
hw/vfio/pci.c
View File

@ -41,6 +41,7 @@
#include "trace.h"
#include "qapi/error.h"
#include "migration/blocker.h"
#include "migration/qemu-file.h"
#define TYPE_VFIO_PCI_NOHOTPLUG "vfio-pci-nohotplug"
@ -2401,11 +2402,61 @@ static Object *vfio_pci_get_object(VFIODevice *vbasedev)
return OBJECT(vdev);
}
static bool vfio_msix_present(void *opaque, int version_id)
{
PCIDevice *pdev = opaque;
return msix_present(pdev);
}
const VMStateDescription vmstate_vfio_pci_config = {
.name = "VFIOPCIDevice",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_PCI_DEVICE(pdev, VFIOPCIDevice),
VMSTATE_MSIX_TEST(pdev, VFIOPCIDevice, vfio_msix_present),
VMSTATE_END_OF_LIST()
}
};
static void vfio_pci_save_config(VFIODevice *vbasedev, QEMUFile *f)
{
VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
vmstate_save_state(f, &vmstate_vfio_pci_config, vdev, NULL);
}
static int vfio_pci_load_config(VFIODevice *vbasedev, QEMUFile *f)
{
VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
PCIDevice *pdev = &vdev->pdev;
int ret;
ret = vmstate_load_state(f, &vmstate_vfio_pci_config, vdev, 1);
if (ret) {
return ret;
}
vfio_pci_write_config(pdev, PCI_COMMAND,
pci_get_word(pdev->config + PCI_COMMAND), 2);
if (msi_enabled(pdev)) {
vfio_msi_enable(vdev);
} else if (msix_enabled(pdev)) {
vfio_msix_enable(vdev);
}
return ret;
}
static VFIODeviceOps vfio_pci_ops = {
.vfio_compute_needs_reset = vfio_pci_compute_needs_reset,
.vfio_hot_reset_multi = vfio_pci_hot_reset_multi,
.vfio_eoi = vfio_intx_eoi,
.vfio_get_object = vfio_pci_get_object,
.vfio_save_config = vfio_pci_save_config,
.vfio_load_config = vfio_pci_load_config,
};
int vfio_populate_vga(VFIOPCIDevice *vdev, Error **errp)

2
include/hw/vfio/vfio-common.h
View File

@ -120,6 +120,8 @@ struct VFIODeviceOps {
int (*vfio_hot_reset_multi)(VFIODevice *vdev);
void (*vfio_eoi)(VFIODevice *vdev);
Object *(*vfio_get_object)(VFIODevice *vdev);
void (*vfio_save_config)(VFIODevice *vdev, QEMUFile *f);
int (*vfio_load_config)(VFIODevice *vdev, QEMUFile *f);
};
typedef struct VFIOGroup {