1 /* 2 * Virtio PCI driver 3 * 4 * This module allows virtio devices to be used over a virtual PCI device. 5 * This can be used with QEMU based VMMs like KVM or Xen. 6 * 7 * Copyright IBM Corp. 2007 8 * 9 * Authors: 10 * Anthony Liguori <aliguori@us.ibm.com> 11 * 12 * This header is BSD licensed so anyone can use the definitions to implement 13 * compatible drivers/servers. 14 */ 15 16 #ifndef _LINUX_VIRTIO_PCI_H 17 #define _LINUX_VIRTIO_PCI_H 18 19 /* A 32-bit r/o bitmask of the features supported by the host */ 20 #define VIRTIO_PCI_HOST_FEATURES 0 21 22 /* A 32-bit r/w bitmask of features activated by the guest */ 23 #define VIRTIO_PCI_GUEST_FEATURES 4 24 25 /* A 32-bit r/w PFN for the currently selected queue */ 26 #define VIRTIO_PCI_QUEUE_PFN 8 27 28 /* A 16-bit r/o queue size for the currently selected queue */ 29 #define VIRTIO_PCI_QUEUE_NUM 12 30 31 /* A 16-bit r/w queue selector */ 32 #define VIRTIO_PCI_QUEUE_SEL 14 33 34 /* A 16-bit r/w queue notifier */ 35 #define VIRTIO_PCI_QUEUE_NOTIFY 16 36 37 /* An 8-bit device status register. */ 38 #define VIRTIO_PCI_STATUS 18 39 40 /* An 8-bit r/o interrupt status register. Reading the value will return the 41 * current contents of the ISR and will also clear it. This is effectively 42 * a read-and-acknowledge. */ 43 #define VIRTIO_PCI_ISR 19 44 45 /* MSI-X registers: only enabled if MSI-X is enabled. */ 46 /* A 16-bit vector for configuration changes. */ 47 #define VIRTIO_MSI_CONFIG_VECTOR 20 48 49 /* A 16-bit vector for selected queue notifications. */ 50 #define VIRTIO_MSI_QUEUE_VECTOR 22 51 52 /* Vector value used to disable MSI for queue */ 53 #define VIRTIO_MSI_NO_VECTOR 0xffff 54 55 /* Config space size */ 56 #define VIRTIO_PCI_CONFIG_NOMSI 20 57 #define VIRTIO_PCI_CONFIG_MSI 24 58 59 #endif /* _LINUX_VIRTIO_PCI_H */ 60