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[Qemu-devel] [PATCH v4 03/13] vfio: Add save and load functions for VFIO
From: |
Kirti Wankhede |
Subject: |
[Qemu-devel] [PATCH v4 03/13] vfio: Add save and load functions for VFIO PCI devices |
Date: |
Thu, 20 Jun 2019 20:07:31 +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 | 112 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
hw/vfio/pci.h | 29 +++++++++++++++
2 files changed, 141 insertions(+)
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index ce3fe96efe2c..09a0821a5b1c 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -1187,6 +1187,118 @@ void vfio_pci_write_config(PCIDevice *pdev,
}
}
+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);
+}
+
+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);
+}
+
/*
* Interrupt setup
*/
diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h
index 834a90d64686..847be5f56478 100644
--- a/hw/vfio/pci.h
+++ b/hw/vfio/pci.h
@@ -19,6 +19,7 @@
#include "qemu/queue.h"
#include "qemu/timer.h"
+#ifdef CONFIG_LINUX
#define PCI_ANY_ID (~0)
struct VFIOPCIDevice;
@@ -202,4 +203,32 @@ void vfio_display_reset(VFIOPCIDevice *vdev);
int vfio_display_probe(VFIOPCIDevice *vdev, Error **errp);
void vfio_display_finalize(VFIOPCIDevice *vdev);
+void vfio_pci_save_config(VFIODevice *vbasedev, QEMUFile *f);
+void vfio_pci_load_config(VFIODevice *vbasedev, QEMUFile *f);
+
+static inline Object *vfio_pci_get_object(VFIODevice *vbasedev)
+{
+ VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
+
+ return OBJECT(vdev);
+}
+
+#else
+static inline void vfio_pci_save_config(VFIODevice *vbasedev, QEMUFile *f)
+{
+ g_assert(false);
+}
+
+static inline void vfio_pci_load_config(VFIODevice *vbasedev, QEMUFile *f)
+{
+ g_assert(false);
+}
+
+static inline Object *vfio_pci_get_object(VFIODevice *vbasedev)
+{
+ return NULL;
+}
+
+#endif
+
#endif /* HW_VFIO_VFIO_PCI_H */
--
2.7.0
- Re: [Qemu-devel] [PATCH v4 01/13] vfio: KABI for migration interface, (continued)
- Re: [Qemu-devel] [PATCH v4 01/13] vfio: KABI for migration interface, Alex Williamson, 2019/06/21
- Re: [Qemu-devel] [PATCH v4 01/13] vfio: KABI for migration interface, Kirti Wankhede, 2019/06/21
- Re: [Qemu-devel] [PATCH v4 01/13] vfio: KABI for migration interface, Alex Williamson, 2019/06/21
- Re: [Qemu-devel] [PATCH v4 01/13] vfio: KABI for migration interface, Kirti Wankhede, 2019/06/21
- Re: [Qemu-devel] [PATCH v4 01/13] vfio: KABI for migration interface, Alex Williamson, 2019/06/21
- Re: [Qemu-devel] [PATCH v4 01/13] vfio: KABI for migration interface, Kirti Wankhede, 2019/06/24
- Re: [Qemu-devel] [PATCH v4 01/13] vfio: KABI for migration interface, Alex Williamson, 2019/06/24
- Re: [Qemu-devel] [PATCH v4 01/13] vfio: KABI for migration interface, Kirti Wankhede, 2019/06/24
- Re: [Qemu-devel] [PATCH v4 01/13] vfio: KABI for migration interface, Alex Williamson, 2019/06/24
- Re: [Qemu-devel] [PATCH v4 01/13] vfio: KABI for migration interface, Kirti Wankhede, 2019/06/25
[Qemu-devel] [PATCH v4 03/13] vfio: Add save and load functions for VFIO PCI devices,
Kirti Wankhede <=
[Qemu-devel] [PATCH v4 07/13] vfio: Register SaveVMHandlers for VFIO device, Kirti Wankhede, 2019/06/20
[Qemu-devel] [PATCH v4 06/13] vfio: Add migration state change notifier, Kirti Wankhede, 2019/06/20
[Qemu-devel] [PATCH v4 04/13] vfio: Add migration region initialization and finalize function, Kirti Wankhede, 2019/06/20