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    SubjectRe: [PATCH 16/18] tools include uapi: Grab a copy of linux/vhost.h
    On Tue, Aug 01, 2017 at 04:56:43PM -0300, Arnaldo Carvalho de Melo wrote:
    > From: Arnaldo Carvalho de Melo <acme@redhat.com>
    >
    > We will use it to generate tables for beautifying ioctl's 'cmd' arg.
    >
    > Cc: Adrian Hunter <adrian.hunter@intel.com>
    > Cc: David Ahern <dsahern@gmail.com>
    > Cc: Jason Wang <jasowang@redhat.com>
    > Cc: Jiri Olsa <jolsa@kernel.org>
    > Cc: "Michael S. Tsirkin" <mst@redhat.com>
    > Cc: Namhyung Kim <namhyung@kernel.org>
    > Cc: Wang Nan <wangnan0@huawei.com>
    > Link: http://lkml.kernel.org/n/tip-nxwpq34hu6te1m2ra5m7o8n9@git.kernel.org
    > Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

    Is this what tools/perf always does? Isn't there a way
    to reuse the single header?

    > ---
    > tools/include/uapi/linux/vhost.h | 209 +++++++++++++++++++++++++++++++++++++++
    > tools/perf/MANIFEST | 1 +
    > tools/perf/check-headers.sh | 1 +
    > 3 files changed, 211 insertions(+)
    > create mode 100644 tools/include/uapi/linux/vhost.h
    >
    > diff --git a/tools/include/uapi/linux/vhost.h b/tools/include/uapi/linux/vhost.h
    > new file mode 100644
    > index 000000000000..60180c0b5dc6
    > --- /dev/null
    > +++ b/tools/include/uapi/linux/vhost.h
    > @@ -0,0 +1,209 @@
    > +#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/compiler.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;
    > +};
    > +
    > +/* no alignment requirement */
    > +struct vhost_iotlb_msg {
    > + __u64 iova;
    > + __u64 size;
    > + __u64 uaddr;
    > +#define VHOST_ACCESS_RO 0x1
    > +#define VHOST_ACCESS_WO 0x2
    > +#define VHOST_ACCESS_RW 0x3
    > + __u8 perm;
    > +#define VHOST_IOTLB_MISS 1
    > +#define VHOST_IOTLB_UPDATE 2
    > +#define VHOST_IOTLB_INVALIDATE 3
    > +#define VHOST_IOTLB_ACCESS_FAIL 4
    > + __u8 type;
    > +};
    > +
    > +#define VHOST_IOTLB_MSG 0x1
    > +
    > +struct vhost_msg {
    > + int type;
    > + union {
    > + struct vhost_iotlb_msg iotlb;
    > + __u8 padding[64];
    > + };
    > +};
    > +
    > +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)
    > +
    > +/* Set the vring byte order in num. Valid values are VHOST_VRING_LITTLE_ENDIAN
    > + * or VHOST_VRING_BIG_ENDIAN (other values return -EINVAL).
    > + * The byte order cannot be changed while the device is active: trying to do so
    > + * returns -EBUSY.
    > + * This is a legacy only API that is simply ignored when VIRTIO_F_VERSION_1 is
    > + * set.
    > + * Not all kernel configurations support this ioctl, but all configurations that
    > + * support SET also support GET.
    > + */
    > +#define VHOST_VRING_LITTLE_ENDIAN 0
    > +#define VHOST_VRING_BIG_ENDIAN 1
    > +#define VHOST_SET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x13, struct vhost_vring_state)
    > +#define VHOST_GET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x14, 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)
    > +/* Set busy loop timeout (in us) */
    > +#define VHOST_SET_VRING_BUSYLOOP_TIMEOUT _IOW(VHOST_VIRTIO, 0x23, \
    > + struct vhost_vring_state)
    > +/* Get busy loop timeout (in us) */
    > +#define VHOST_GET_VRING_BUSYLOOP_TIMEOUT _IOW(VHOST_VIRTIO, 0x24, \
    > + struct vhost_vring_state)
    > +
    > +/* 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
    > +
    > +/* VHOST_SCSI specific definitions */
    > +
    > +/*
    > + * Used by QEMU userspace to ensure a consistent vhost-scsi ABI.
    > + *
    > + * ABI Rev 0: July 2012 version starting point for v3.6-rc merge candidate +
    > + * RFC-v2 vhost-scsi userspace. Add GET_ABI_VERSION ioctl usage
    > + * ABI Rev 1: January 2013. Ignore vhost_tpgt filed in struct vhost_scsi_target.
    > + * All the targets under vhost_wwpn can be seen and used by guset.
    > + */
    > +
    > +#define VHOST_SCSI_ABI_VERSION 1
    > +
    > +struct vhost_scsi_target {
    > + int abi_version;
    > + char vhost_wwpn[224]; /* TRANSPORT_IQN_LEN */
    > + unsigned short vhost_tpgt;
    > + unsigned short reserved;
    > +};
    > +
    > +#define VHOST_SCSI_SET_ENDPOINT _IOW(VHOST_VIRTIO, 0x40, struct vhost_scsi_target)
    > +#define VHOST_SCSI_CLEAR_ENDPOINT _IOW(VHOST_VIRTIO, 0x41, struct vhost_scsi_target)
    > +/* Changing this breaks userspace. */
    > +#define VHOST_SCSI_GET_ABI_VERSION _IOW(VHOST_VIRTIO, 0x42, int)
    > +/* Set and get the events missed flag */
    > +#define VHOST_SCSI_SET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x43, __u32)
    > +#define VHOST_SCSI_GET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x44, __u32)
    > +
    > +/* VHOST_VSOCK specific defines */
    > +
    > +#define VHOST_VSOCK_SET_GUEST_CID _IOW(VHOST_VIRTIO, 0x60, __u64)
    > +#define VHOST_VSOCK_SET_RUNNING _IOW(VHOST_VIRTIO, 0x61, int)
    > +
    > +#endif
    > diff --git a/tools/perf/MANIFEST b/tools/perf/MANIFEST
    > index 513f52a484fd..62072822dc85 100644
    > --- a/tools/perf/MANIFEST
    > +++ b/tools/perf/MANIFEST
    > @@ -85,6 +85,7 @@ tools/include/uapi/linux/mman.h
    > tools/include/uapi/linux/perf_event.h
    > tools/include/uapi/linux/sched.h
    > tools/include/uapi/linux/stat.h
    > +tools/include/uapi/linux/vhost.h
    > tools/include/uapi/sound/asound.h
    > tools/include/linux/poison.h
    > tools/include/linux/rbtree.h
    > diff --git a/tools/perf/check-headers.sh b/tools/perf/check-headers.sh
    > index 1f009506ff63..932fda54b8a6 100755
    > --- a/tools/perf/check-headers.sh
    > +++ b/tools/perf/check-headers.sh
    > @@ -8,6 +8,7 @@ include/uapi/linux/kvm.h
    > include/uapi/linux/perf_event.h
    > include/uapi/linux/sched.h
    > include/uapi/linux/stat.h
    > +include/uapi/linux/vhost.h
    > include/uapi/sound/asound.h
    > include/linux/hash.h
    > include/uapi/linux/hw_breakpoint.h
    > --
    > 2.9.4

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