This patch is to extend PCI CAP id for migration cap and
add reg macros. The CAP ID is trial and we may find better one if the
solution is feasible.

For VF driver to  control that triggers mailbox irq or not during migration.

Qemu stores migration status in the reg

VF driver tells Qemu ready for migration

VF driver stores mailbox interrupt vector in the reg for Qemu to trigger during 

Signed-off-by: Lan Tianyu <>
 include/hw/pci/pci_regs.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/include/hw/pci/pci_regs.h b/include/hw/pci/pci_regs.h
index 57e8c80..0dcaf7e 100644
--- a/include/hw/pci/pci_regs.h
+++ b/include/hw/pci/pci_regs.h
@@ -213,6 +213,7 @@
 #define  PCI_CAP_ID_MSIX       0x11    /* MSI-X */
 #define  PCI_CAP_ID_SATA       0x12    /* Serial ATA */
 #define  PCI_CAP_ID_AF         0x13    /* PCI Advanced Features */
+#define  PCI_CAP_ID_MIGRATION   0x14 
 #define PCI_CAP_LIST_NEXT      1       /* Next capability in the list */
 #define PCI_CAP_FLAGS          2       /* Capability defined flags (16 bits) */
 #define PCI_CAP_SIZEOF         4
@@ -716,4 +717,22 @@
 #define PCI_ACS_CTRL           0x06    /* ACS Control Register */
 #define PCI_ACS_EGRESS_CTL_V   0x08    /* ACS Egress Control Vector */
+/* Migration*/
+#define PCI_VF_MIGRATION_CAP        0x04
+#define PCI_VF_MIGRATION_VF_STATUS     0x06
+#define PCI_VF_MIGRATION_IRQ           0x07
+#define VMM_MIGRATION_END        0x00
+#define VMM_MIGRATION_START      0x01          
+#define PCI_VF_WAIT_FOR_MIGRATION   0x00          
+#define PCI_VF_READY_FOR_MIGRATION  0x01        
+#define PCI_VF_MIGRATION_ENABLE     0x01
 #endif /* LINUX_PCI_REGS_H */

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