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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/linux/virtio_pci.h
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.
7 * Copyright IBM Corp. 2007
10 * Anthony Liguori <aliguori@us.ibm.com>
12 * This header is BSD licensed so anyone can use the definitions to implement
13 * compatible drivers/servers.
16 #ifndef _LINUX_VIRTIO_PCI_H
17 #define _LINUX_VIRTIO_PCI_H
19 #include <linux/virtio_config.h>
21 /* A 32-bit r/o bitmask of the features supported by the host */
22 #define VIRTIO_PCI_HOST_FEATURES 0
24 /* A 32-bit r/w bitmask of features activated by the guest */
25 #define VIRTIO_PCI_GUEST_FEATURES 4
27 /* A 32-bit r/w PFN for the currently selected queue */
28 #define VIRTIO_PCI_QUEUE_PFN 8
30 /* A 16-bit r/o queue size for the currently selected queue */
31 #define VIRTIO_PCI_QUEUE_NUM 12
33 /* A 16-bit r/w queue selector */
34 #define VIRTIO_PCI_QUEUE_SEL 14
36 /* A 16-bit r/w queue notifier */
37 #define VIRTIO_PCI_QUEUE_NOTIFY 16
39 /* An 8-bit device status register. */
40 #define VIRTIO_PCI_STATUS 18
42 /* An 8-bit r/o interrupt status register. Reading the value will return the
43 * current contents of the ISR and will also clear it. This is effectively
44 * a read-and-acknowledge. */
45 #define VIRTIO_PCI_ISR 19
47 /* The bit of the ISR which indicates a device configuration change. */
48 #define VIRTIO_PCI_ISR_CONFIG 0x2
50 /* The remaining space is defined by each driver as the per-driver
51 * configuration space */
52 #define VIRTIO_PCI_CONFIG 20
54 /* Virtio ABI version, this must match exactly */
55 #define VIRTIO_PCI_ABI_VERSION 0