This makes it possible to build vhost support

on systems which do not have this header.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

---

 kvm/include/linux/vhost.h |  130 +++++++++++++++++++++++++++++++++++++++++++++

 1 files changed, 130 insertions(+), 0 deletions(-)

 create mode 100644 kvm/include/linux/vhost.h

diff --git a/kvm/include/linux/vhost.h b/kvm/include/linux/vhost.h

new file mode 100644

index 0000000..165a484

--- /dev/null

+++ b/kvm/include/linux/vhost.h

@@ -0,0 +1,130 @@

+#ifndef _LINUX_VHOST_H

+#define _LINUX_VHOST_H

+/* Userspace interface for in-kernel virtio accelerators. */

+

+/* vhost is used to reduce the number of system calls involved in virtio.

+ *

+ * Existing virtio net code is used in the guest without modification.

+ *

+ * This header includes interface used by userspace hypervisor for

+ * device configuration.

+ */

+

+#include <linux/types.h>

+

+#include <linux/ioctl.h>

+#include <linux/virtio_config.h>

+#include <linux/virtio_ring.h>

+

+struct vhost_vring_state {

+	unsigned int index;

+	unsigned int num;

+};

+

+struct vhost_vring_file {

+	unsigned int index;

+	int fd; /* Pass -1 to unbind from file. */

+

+};

+

+struct vhost_vring_addr {

+	unsigned int index;

+	/* Option flags. */

+	unsigned int flags;

+	/* Flag values: */

+	/* Whether log address is valid. If set enables logging. */

+#define VHOST_VRING_F_LOG 0

+

+	/* Start of array of descriptors (virtually contiguous) */

+	__u64 desc_user_addr;

+	/* Used structure address. Must be 32 bit aligned */

+	__u64 used_user_addr;

+	/* Available structure address. Must be 16 bit aligned */

+	__u64 avail_user_addr;

+	/* Logging support. */

+	/* Log writes to used structure, at offset calculated from specified

+	 * address. Address must be 32 bit aligned. */

+	__u64 log_guest_addr;

+};

+

+struct vhost_memory_region {

+	__u64 guest_phys_addr;

+	__u64 memory_size; /* bytes */

+	__u64 userspace_addr;

+	__u64 flags_padding; /* No flags are currently specified. */

+};

+

+/* All region addresses and sizes must be 4K aligned. */

+#define VHOST_PAGE_SIZE 0x1000

+

+struct vhost_memory {

+	__u32 nregions;

+	__u32 padding;

+	struct vhost_memory_region regions[0];

+};

+

+/* ioctls */

+

+#define VHOST_VIRTIO 0xAF

+

+/* Features bitmask for forward compatibility.  Transport bits are used for

+ * vhost specific features. */

+#define VHOST_GET_FEATURES	_IOR(VHOST_VIRTIO, 0x00, __u64)

+#define VHOST_SET_FEATURES	_IOW(VHOST_VIRTIO, 0x00, __u64)

+

+/* Set current process as the (exclusive) owner of this file descriptor.  This

+ * must be called before any other vhost command.  Further calls to

+ * VHOST_OWNER_SET fail until VHOST_OWNER_RESET is called. */

+#define VHOST_SET_OWNER _IO(VHOST_VIRTIO, 0x01)

+/* Give up ownership, and reset the device to default values.

+ * Allows subsequent call to VHOST_OWNER_SET to succeed. */

+#define VHOST_RESET_OWNER _IO(VHOST_VIRTIO, 0x02)

+

+/* Set up/modify memory layout */

+#define VHOST_SET_MEM_TABLE	_IOW(VHOST_VIRTIO, 0x03, struct vhost_memory)

+

+/* Write logging setup. */

+/* Memory writes can optionally be logged by setting bit at an offset

+ * (calculated from the physical address) from specified log base.

+ * The bit is set using an atomic 32 bit operation. */

+/* Set base address for logging. */

+#define VHOST_SET_LOG_BASE _IOW(VHOST_VIRTIO, 0x04, __u64)

+/* Specify an eventfd file descriptor to signal on log write. */

+#define VHOST_SET_LOG_FD _IOW(VHOST_VIRTIO, 0x07, int)

+

+/* Ring setup. */

+/* Set number of descriptors in ring. This parameter can not

+ * be modified while ring is running (bound to a device). */

+#define VHOST_SET_VRING_NUM _IOW(VHOST_VIRTIO, 0x10, struct vhost_vring_state)

+/* Set addresses for the ring. */

+#define VHOST_SET_VRING_ADDR _IOW(VHOST_VIRTIO, 0x11, struct vhost_vring_addr)

+/* Base value where queue looks for available descriptors */

+#define VHOST_SET_VRING_BASE _IOW(VHOST_VIRTIO, 0x12, struct vhost_vring_state)

+/* Get accessor: reads index, writes value in num */

+#define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state)

+

+/* The following ioctls use eventfd file descriptors to signal and poll

+ * for events. */

+

+/* Set eventfd to poll for added buffers */

+#define VHOST_SET_VRING_KICK _IOW(VHOST_VIRTIO, 0x20, struct vhost_vring_file)

+/* Set eventfd to signal when buffers have beed used */

+#define VHOST_SET_VRING_CALL _IOW(VHOST_VIRTIO, 0x21, struct vhost_vring_file)

+/* Set eventfd to signal an error */

+#define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file)

+

+/* VHOST_NET specific defines */

+

+/* Attach virtio net ring to a raw socket, or tap device.

+ * The socket must be already bound to an ethernet device, this device will be

+ * used for transmit.  Pass fd -1 to unbind from the socket and the transmit

+ * device.  This can be used to stop the ring (e.g. for migration). */

+#define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file)

+

+/* Feature bits */

+/* Log all write descriptors. Can be changed while device is active. */

+#define VHOST_F_LOG_ALL 26

+/* vhost-net should add virtio_net_hdr for RX, and strip for TX packets. */

+#define VHOST_NET_F_VIRTIO_NET_HDR 27

+

+#endif

-- 

1.6.6.144.g5c3af