These functions save and restore PCI device specific data - config
space of PCI device.
Tested save and restore with MSI and MSIX type.
Signed-off-by: Kirti Wankhede <kwankh...@nvidia.com>
Reviewed-by: Neo Jia <c...@nvidia.com>
---
hw/vfio/pci.c | 95 +++++++++++++++++++++++++++++++++++++++++++
include/hw/vfio/vfio-common.h | 2 +
2 files changed, 97 insertions(+)
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 27f8872db2b1..5ba340aee1d4 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -41,6 +41,7 @@
#include "trace.h"
#include "qapi/error.h"
#include "migration/blocker.h"
+#include "migration/qemu-file.h"
#define TYPE_VFIO_PCI "vfio-pci"
#define PCI_VFIO(obj) OBJECT_CHECK(VFIOPCIDevice, obj, TYPE_VFIO_PCI)
@@ -2407,11 +2408,105 @@ static Object *vfio_pci_get_object(VFIODevice
*vbasedev)
return OBJECT(vdev);
}
+static void vfio_pci_save_config(VFIODevice *vbasedev, QEMUFile *f)
+{
+ VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
+ PCIDevice *pdev = &vdev->pdev;
+
+ qemu_put_buffer(f, vdev->emulated_config_bits, vdev->config_size);
+ qemu_put_buffer(f, vdev->pdev.wmask, vdev->config_size);
+ pci_device_save(pdev, f);
+
+ qemu_put_be32(f, vdev->interrupt);
+ if (vdev->interrupt == VFIO_INT_MSIX) {
+ msix_save(pdev, f);
+ }
+}
+
+static int vfio_pci_load_config(VFIODevice *vbasedev, QEMUFile *f)
+{
+ VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
+ PCIDevice *pdev = &vdev->pdev;
+ uint32_t interrupt_type;
+ uint16_t pci_cmd;
+ int i, ret;
+
+ qemu_get_buffer(f, vdev->emulated_config_bits, vdev->config_size);
+ qemu_get_buffer(f, vdev->pdev.wmask, vdev->config_size);
+
+ ret = pci_device_load(pdev, f);
+ if (ret) {
+ return ret;
+ }
+
+ /* retore pci bar configuration */
+ pci_cmd = pci_default_read_config(pdev, PCI_COMMAND, 2);
+ vfio_pci_write_config(pdev, PCI_COMMAND,
+ pci_cmd & (!(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)), 2);
+ for (i = 0; i < PCI_ROM_SLOT; i++) {
+ uint32_t bar = pci_default_read_config(pdev,
+ PCI_BASE_ADDRESS_0 + i * 4, 4);
+
+ vfio_pci_write_config(pdev, PCI_BASE_ADDRESS_0 + i * 4, bar, 4);
+ }
+
+ interrupt_type = qemu_get_be32(f);
+
+ if (interrupt_type == VFIO_INT_MSI) {
+ uint32_t msi_flags, msi_addr_lo, msi_addr_hi = 0, msi_data;
+ bool msi_64bit;
+
+ /* restore msi configuration */
+ msi_flags = pci_default_read_config(pdev,
+ pdev->msi_cap + PCI_MSI_FLAGS, 2);
+ msi_64bit = (msi_flags & PCI_MSI_FLAGS_64BIT);
+
+ vfio_pci_write_config(pdev, pdev->msi_cap + PCI_MSI_FLAGS,
+ msi_flags & (!PCI_MSI_FLAGS_ENABLE), 2);
+
+ msi_addr_lo = pci_default_read_config(pdev,
+ pdev->msi_cap + PCI_MSI_ADDRESS_LO, 4);
+ vfio_pci_write_config(pdev, pdev->msi_cap + PCI_MSI_ADDRESS_LO,
+ msi_addr_lo, 4);
+
+ if (msi_64bit) {
+ msi_addr_hi = pci_default_read_config(pdev,
+ pdev->msi_cap + PCI_MSI_ADDRESS_HI, 4);
+ vfio_pci_write_config(pdev, pdev->msi_cap + PCI_MSI_ADDRESS_HI,
+ msi_addr_hi, 4);
+ }
+
+ msi_data = pci_default_read_config(pdev,
+ pdev->msi_cap + (msi_64bit ? PCI_MSI_DATA_64 :
PCI_MSI_DATA_32),
+ 2);
+
+ vfio_pci_write_config(pdev,
+ pdev->msi_cap + (msi_64bit ? PCI_MSI_DATA_64 :
PCI_MSI_DATA_32),
+ msi_data, 2);
+
+ vfio_pci_write_config(pdev, pdev->msi_cap + PCI_MSI_FLAGS,
+ msi_flags | PCI_MSI_FLAGS_ENABLE, 2);
+ } else if (interrupt_type == VFIO_INT_MSIX) {
+ uint16_t offset;
+
+ offset = pci_default_read_config(pdev,
+ pdev->msix_cap + PCI_MSIX_FLAGS + 1, 2);
+ /* load enable bit and maskall bit */
+ vfio_pci_write_config(pdev, pdev->msix_cap + PCI_MSIX_FLAGS + 1,
+ offset, 2);
+ msix_load(pdev, f);
+ }
+ vfio_pci_write_config(pdev, PCI_COMMAND, pci_cmd, 2);
+ return 0;
+}
+
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)
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 74261feaeac9..d69a7f3ae31e 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -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 {
--
2.7.0
