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[Qemu-devel] [PATCH v5 04/13] vfio: Add save and load functions for VFIO
From: |
Kirti Wankhede |
Subject: |
[Qemu-devel] [PATCH v5 04/13] vfio: Add save and load functions for VFIO PCI devices |
Date: |
Tue, 9 Jul 2019 00:47:23 +0530 |
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 <address@hidden>
Reviewed-by: Neo Jia <address@hidden>
---
hw/vfio/pci.c | 114 ++++++++++++++++++++++++++++++++++++++++++
include/hw/vfio/vfio-common.h | 2 +
2 files changed, 116 insertions(+)
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index de0d286fc9dd..5fe4f8076cac 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2395,11 +2395,125 @@ 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;
+ uint16_t pci_cmd;
+ int i;
+
+ for (i = 0; i < PCI_ROM_SLOT; i++) {
+ uint32_t bar;
+
+ bar = pci_default_read_config(pdev, PCI_BASE_ADDRESS_0 + i * 4, 4);
+ qemu_put_be32(f, bar);
+ }
+
+ qemu_put_be32(f, vdev->interrupt);
+ if (vdev->interrupt == VFIO_INT_MSI) {
+ uint32_t msi_flags, msi_addr_lo, msi_addr_hi = 0, msi_data;
+ bool msi_64bit;
+
+ msi_flags = pci_default_read_config(pdev, pdev->msi_cap +
PCI_MSI_FLAGS,
+ 2);
+ msi_64bit = (msi_flags & PCI_MSI_FLAGS_64BIT);
+
+ msi_addr_lo = pci_default_read_config(pdev,
+ pdev->msi_cap + PCI_MSI_ADDRESS_LO,
4);
+ qemu_put_be32(f, msi_addr_lo);
+
+ if (msi_64bit) {
+ msi_addr_hi = pci_default_read_config(pdev,
+ pdev->msi_cap +
PCI_MSI_ADDRESS_HI,
+ 4);
+ }
+ qemu_put_be32(f, msi_addr_hi);
+
+ msi_data = pci_default_read_config(pdev,
+ pdev->msi_cap + (msi_64bit ? PCI_MSI_DATA_64 :
PCI_MSI_DATA_32),
+ 2);
+ qemu_put_be32(f, msi_data);
+ } else if (vdev->interrupt == VFIO_INT_MSIX) {
+ uint16_t offset;
+
+ /* save enable bit and maskall bit */
+ offset = pci_default_read_config(pdev,
+ pdev->msix_cap + PCI_MSIX_FLAGS + 1, 2);
+ qemu_put_be16(f, offset);
+ msix_save(pdev, f);
+ }
+ pci_cmd = pci_default_read_config(pdev, PCI_COMMAND, 2);
+ qemu_put_be16(f, pci_cmd);
+}
+
+static void vfio_pci_load_config(VFIODevice *vbasedev, QEMUFile *f)
+{
+ VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
+ PCIDevice *pdev = &vdev->pdev;
+ uint32_t interrupt_type;
+ uint32_t msi_flags, msi_addr_lo, msi_addr_hi = 0, msi_data;
+ uint16_t pci_cmd;
+ bool msi_64bit;
+ int i;
+
+ /* 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 = qemu_get_be32(f);
+
+ vfio_pci_write_config(pdev, PCI_BASE_ADDRESS_0 + i * 4, bar, 4);
+ }
+ vfio_pci_write_config(pdev, PCI_COMMAND,
+ pci_cmd | PCI_COMMAND_IO | PCI_COMMAND_MEMORY, 2);
+
+ interrupt_type = qemu_get_be32(f);
+
+ if (interrupt_type == VFIO_INT_MSI) {
+ /* 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 = qemu_get_be32(f);
+ vfio_pci_write_config(pdev, pdev->msi_cap + PCI_MSI_ADDRESS_LO,
+ msi_addr_lo, 4);
+
+ msi_addr_hi = qemu_get_be32(f);
+ if (msi_64bit) {
+ vfio_pci_write_config(pdev, pdev->msi_cap + PCI_MSI_ADDRESS_HI,
+ msi_addr_hi, 4);
+ }
+ msi_data = qemu_get_be32(f);
+ 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 = qemu_get_be16(f);
+
+ /* load enable bit and maskall bit */
+ vfio_pci_write_config(pdev, pdev->msix_cap + PCI_MSIX_FLAGS + 1,
+ offset, 2);
+ msix_load(pdev, f);
+ }
+ pci_cmd = qemu_get_be16(f);
+ vfio_pci_write_config(pdev, PCI_COMMAND, pci_cmd, 2);
+}
+
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 771b6d59a3db..ee72bd984a36 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);
+ void (*vfio_load_config)(VFIODevice *vdev, QEMUFile *f);
};
typedef struct VFIOGroup {
--
2.7.0
- [Qemu-devel] [PATCH v5 00/13] Add migration support for VFIO device, Kirti Wankhede, 2019/07/08
- [Qemu-devel] [PATCH v5 01/13] vfio: KABI for migration interface, Kirti Wankhede, 2019/07/08
- [Qemu-devel] [PATCH v5 02/13] vfio: Add function to unmap VFIO region, Kirti Wankhede, 2019/07/08
- [Qemu-devel] [PATCH v5 03/13] vfio: Add vfio_get_object callback to VFIODeviceOps, Kirti Wankhede, 2019/07/08
- [Qemu-devel] [PATCH v5 04/13] vfio: Add save and load functions for VFIO PCI devices,
Kirti Wankhede <=
- [Qemu-devel] [PATCH v5 06/13] vfio: Add VM state change handler to know state of VM, Kirti Wankhede, 2019/07/08
- [Qemu-devel] [PATCH v5 07/13] vfio: Add migration state change notifier, Kirti Wankhede, 2019/07/08
- [Qemu-devel] [PATCH v5 08/13] vfio: Register SaveVMHandlers for VFIO device, Kirti Wankhede, 2019/07/08
- [Qemu-devel] [PATCH v5 05/13] vfio: Add migration region initialization and finalize function, Kirti Wankhede, 2019/07/08
- [Qemu-devel] [PATCH v5 09/13] vfio: Add save state functions to SaveVMHandlers, Kirti Wankhede, 2019/07/08
- [Qemu-devel] [PATCH v5 10/13] vfio: Add load state functions to SaveVMHandlers, Kirti Wankhede, 2019/07/08
- [Qemu-devel] [PATCH v5 11/13] vfio: Add function to get dirty page list, Kirti Wankhede, 2019/07/08
- [Qemu-devel] [PATCH v5 12/13] vfio: Add vfio_listerner_log_sync to mark dirty pages, Kirti Wankhede, 2019/07/08
- [Qemu-devel] [PATCH v5 13/13] vfio: Make vfio-pci device migration capable., Kirti Wankhede, 2019/07/08
- Re: [Qemu-devel] [PATCH v5 00/13] Add migration support for VFIO device, no-reply, 2019/07/08