Do not reset a vfio-pci device during CPR, and do not complain if the
kernel's PCI config space changes for non-emulated bits between the
vmstate save and load, which can happen due to ongoing interrupt activity.
Signed-off-by: Steve Sistare <steven.sist...@oracle.com>
---
hw/vfio/pci.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 24ebd69..fa77c36 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -29,6 +29,8 @@
#include "hw/pci/pci_bridge.h"
#include "hw/qdev-properties.h"
#include "hw/qdev-properties-system.h"
+#include "migration/misc.h"
+#include "migration/cpr.h"
#include "migration/vmstate.h"
#include "qapi/qmp/qdict.h"
#include "qemu/error-report.h"
@@ -3324,6 +3326,11 @@ static void vfio_pci_reset(DeviceState *dev)
{
VFIOPCIDevice *vdev = VFIO_PCI(dev);
+ /* Do not reset the device during qemu_system_reset prior to cpr load */
+ if (vdev->vbasedev.reused) {
+ return;
+ }
+
trace_vfio_pci_reset(vdev->vbasedev.name);
vfio_pci_pre_reset(vdev);
@@ -3447,6 +3454,35 @@ static void vfio_pci_set_fd(Object *obj, const char
*str, Error **errp)
}
#endif
+/*
+ * The kernel may change non-emulated config bits. Exclude them from the
+ * changed-bits check in get_pci_config_device.
+ */
+static int vfio_pci_pre_load(void *opaque)
+{
+ VFIOPCIDevice *vdev = opaque;
+ PCIDevice *pdev = &vdev->pdev;
+ int size = MIN(pci_config_size(pdev), vdev->config_size);
+ int i;
+
+ for (i = 0; i < size; i++) {
+ pdev->cmask[i] &= vdev->emulated_config_bits[i];
+ }
+
+ return 0;
+}
+
+static const VMStateDescription vfio_pci_vmstate = {
+ .name = "vfio-pci",
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .pre_load = vfio_pci_pre_load,
+ .needed = cpr_needed_for_reuse,
+ .fields = (VMStateField[]) {
+ VMSTATE_END_OF_LIST()
+ }
+};
+
static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
@@ -3457,6 +3493,7 @@ static void vfio_pci_dev_class_init(ObjectClass *klass,
void *data)
#ifdef CONFIG_IOMMUFD
object_class_property_add_str(klass, "fd", NULL, vfio_pci_set_fd);
#endif
+ dc->vmsd = &vfio_pci_vmstate;
dc->desc = "VFIO-based PCI device assignment";
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
pdc->realize = vfio_realize;
--
1.8.3.1
