Old code was affected by memory gaps which resulted in buffer pointers pointing to address outside of the mapped regions. Here we are introducing following changes: - new function qemu_get_ram_block_host_ptr() returns host pointer to the ram block, it is needed to calculate offset of specific region in the host memory - new field mmap_offset is added to the VhostUserMemoryRegion. It contains offset where specific region starts in the mapped memory. As there is stil no wider adoption of vhost-user agreement was made that we will not bump version number due to this change - other fileds in VhostUserMemoryRegion struct are not changed, as they are all needed for usermode app implementation - region data is not taken from ram_list.blocks anymore, instead we use region data which is alredy calculated for use in vhost-net - Now multiple regions can have same FD and user applicaton can call mmap() multiple times with the same FD but with different offset (user needs to take care for offset page alignment) Signed-off-by: Damjan Marion <damarion@cisco.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Damjan Marion <damarion@cisco.com>
348 lines
9.9 KiB
C
348 lines
9.9 KiB
C
/*
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* vhost-user
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*
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* Copyright (c) 2013 Virtual Open Systems Sarl.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "hw/virtio/vhost.h"
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#include "hw/virtio/vhost-backend.h"
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#include "sysemu/char.h"
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#include "sysemu/kvm.h"
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#include "qemu/error-report.h"
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#include "qemu/sockets.h"
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#include "exec/ram_addr.h"
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <linux/vhost.h>
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#define VHOST_MEMORY_MAX_NREGIONS 8
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typedef enum VhostUserRequest {
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VHOST_USER_NONE = 0,
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VHOST_USER_GET_FEATURES = 1,
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VHOST_USER_SET_FEATURES = 2,
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VHOST_USER_SET_OWNER = 3,
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VHOST_USER_RESET_OWNER = 4,
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VHOST_USER_SET_MEM_TABLE = 5,
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VHOST_USER_SET_LOG_BASE = 6,
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VHOST_USER_SET_LOG_FD = 7,
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VHOST_USER_SET_VRING_NUM = 8,
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VHOST_USER_SET_VRING_ADDR = 9,
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VHOST_USER_SET_VRING_BASE = 10,
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VHOST_USER_GET_VRING_BASE = 11,
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VHOST_USER_SET_VRING_KICK = 12,
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VHOST_USER_SET_VRING_CALL = 13,
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VHOST_USER_SET_VRING_ERR = 14,
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VHOST_USER_MAX
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} VhostUserRequest;
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typedef struct VhostUserMemoryRegion {
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uint64_t guest_phys_addr;
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uint64_t memory_size;
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uint64_t userspace_addr;
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uint64_t mmap_offset;
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} VhostUserMemoryRegion;
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typedef struct VhostUserMemory {
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uint32_t nregions;
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uint32_t padding;
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VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS];
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} VhostUserMemory;
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typedef struct VhostUserMsg {
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VhostUserRequest request;
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#define VHOST_USER_VERSION_MASK (0x3)
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#define VHOST_USER_REPLY_MASK (0x1<<2)
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uint32_t flags;
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uint32_t size; /* the following payload size */
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union {
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#define VHOST_USER_VRING_IDX_MASK (0xff)
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#define VHOST_USER_VRING_NOFD_MASK (0x1<<8)
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uint64_t u64;
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struct vhost_vring_state state;
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struct vhost_vring_addr addr;
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VhostUserMemory memory;
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};
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} QEMU_PACKED VhostUserMsg;
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static VhostUserMsg m __attribute__ ((unused));
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#define VHOST_USER_HDR_SIZE (sizeof(m.request) \
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+ sizeof(m.flags) \
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+ sizeof(m.size))
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#define VHOST_USER_PAYLOAD_SIZE (sizeof(m) - VHOST_USER_HDR_SIZE)
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/* The version of the protocol we support */
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#define VHOST_USER_VERSION (0x1)
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static bool ioeventfd_enabled(void)
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{
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return kvm_enabled() && kvm_eventfds_enabled();
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}
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static unsigned long int ioctl_to_vhost_user_request[VHOST_USER_MAX] = {
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-1, /* VHOST_USER_NONE */
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VHOST_GET_FEATURES, /* VHOST_USER_GET_FEATURES */
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VHOST_SET_FEATURES, /* VHOST_USER_SET_FEATURES */
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VHOST_SET_OWNER, /* VHOST_USER_SET_OWNER */
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VHOST_RESET_OWNER, /* VHOST_USER_RESET_OWNER */
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VHOST_SET_MEM_TABLE, /* VHOST_USER_SET_MEM_TABLE */
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VHOST_SET_LOG_BASE, /* VHOST_USER_SET_LOG_BASE */
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VHOST_SET_LOG_FD, /* VHOST_USER_SET_LOG_FD */
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VHOST_SET_VRING_NUM, /* VHOST_USER_SET_VRING_NUM */
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VHOST_SET_VRING_ADDR, /* VHOST_USER_SET_VRING_ADDR */
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VHOST_SET_VRING_BASE, /* VHOST_USER_SET_VRING_BASE */
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VHOST_GET_VRING_BASE, /* VHOST_USER_GET_VRING_BASE */
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VHOST_SET_VRING_KICK, /* VHOST_USER_SET_VRING_KICK */
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VHOST_SET_VRING_CALL, /* VHOST_USER_SET_VRING_CALL */
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VHOST_SET_VRING_ERR /* VHOST_USER_SET_VRING_ERR */
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};
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static VhostUserRequest vhost_user_request_translate(unsigned long int request)
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{
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VhostUserRequest idx;
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for (idx = 0; idx < VHOST_USER_MAX; idx++) {
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if (ioctl_to_vhost_user_request[idx] == request) {
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break;
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}
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}
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return (idx == VHOST_USER_MAX) ? VHOST_USER_NONE : idx;
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}
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static int vhost_user_read(struct vhost_dev *dev, VhostUserMsg *msg)
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{
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CharDriverState *chr = dev->opaque;
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uint8_t *p = (uint8_t *) msg;
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int r, size = VHOST_USER_HDR_SIZE;
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r = qemu_chr_fe_read_all(chr, p, size);
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if (r != size) {
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error_report("Failed to read msg header. Read %d instead of %d.\n", r,
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size);
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goto fail;
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}
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/* validate received flags */
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if (msg->flags != (VHOST_USER_REPLY_MASK | VHOST_USER_VERSION)) {
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error_report("Failed to read msg header."
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" Flags 0x%x instead of 0x%x.\n", msg->flags,
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VHOST_USER_REPLY_MASK | VHOST_USER_VERSION);
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goto fail;
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}
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/* validate message size is sane */
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if (msg->size > VHOST_USER_PAYLOAD_SIZE) {
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error_report("Failed to read msg header."
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" Size %d exceeds the maximum %zu.\n", msg->size,
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VHOST_USER_PAYLOAD_SIZE);
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goto fail;
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}
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if (msg->size) {
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p += VHOST_USER_HDR_SIZE;
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size = msg->size;
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r = qemu_chr_fe_read_all(chr, p, size);
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if (r != size) {
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error_report("Failed to read msg payload."
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" Read %d instead of %d.\n", r, msg->size);
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goto fail;
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}
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}
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return 0;
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fail:
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return -1;
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}
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static int vhost_user_write(struct vhost_dev *dev, VhostUserMsg *msg,
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int *fds, int fd_num)
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{
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CharDriverState *chr = dev->opaque;
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int size = VHOST_USER_HDR_SIZE + msg->size;
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if (fd_num) {
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qemu_chr_fe_set_msgfds(chr, fds, fd_num);
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}
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return qemu_chr_fe_write_all(chr, (const uint8_t *) msg, size) == size ?
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0 : -1;
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}
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static int vhost_user_call(struct vhost_dev *dev, unsigned long int request,
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void *arg)
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{
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VhostUserMsg msg;
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VhostUserRequest msg_request;
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struct vhost_vring_file *file = 0;
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int need_reply = 0;
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int fds[VHOST_MEMORY_MAX_NREGIONS];
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int i, fd;
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size_t fd_num = 0;
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assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
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msg_request = vhost_user_request_translate(request);
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msg.request = msg_request;
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msg.flags = VHOST_USER_VERSION;
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msg.size = 0;
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switch (request) {
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case VHOST_GET_FEATURES:
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need_reply = 1;
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break;
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case VHOST_SET_FEATURES:
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case VHOST_SET_LOG_BASE:
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msg.u64 = *((__u64 *) arg);
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msg.size = sizeof(m.u64);
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break;
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case VHOST_SET_OWNER:
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case VHOST_RESET_OWNER:
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break;
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case VHOST_SET_MEM_TABLE:
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for (i = 0; i < dev->mem->nregions; ++i) {
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struct vhost_memory_region *reg = dev->mem->regions + i;
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fd = qemu_get_ram_fd(reg->guest_phys_addr);
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if (fd > 0) {
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msg.memory.regions[fd_num].userspace_addr = reg->userspace_addr;
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msg.memory.regions[fd_num].memory_size = reg->memory_size;
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msg.memory.regions[fd_num].guest_phys_addr = reg->guest_phys_addr;
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msg.memory.regions[fd_num].mmap_offset = reg->userspace_addr -
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(uintptr_t) qemu_get_ram_block_host_ptr(reg->guest_phys_addr);
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assert(fd_num < VHOST_MEMORY_MAX_NREGIONS);
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fds[fd_num++] = fd;
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}
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}
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msg.memory.nregions = fd_num;
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if (!fd_num) {
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error_report("Failed initializing vhost-user memory map\n"
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"consider using -object memory-backend-file share=on\n");
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return -1;
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}
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msg.size = sizeof(m.memory.nregions);
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msg.size += sizeof(m.memory.padding);
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msg.size += fd_num * sizeof(VhostUserMemoryRegion);
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break;
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case VHOST_SET_LOG_FD:
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fds[fd_num++] = *((int *) arg);
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break;
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case VHOST_SET_VRING_NUM:
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case VHOST_SET_VRING_BASE:
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memcpy(&msg.state, arg, sizeof(struct vhost_vring_state));
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msg.size = sizeof(m.state);
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break;
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case VHOST_GET_VRING_BASE:
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memcpy(&msg.state, arg, sizeof(struct vhost_vring_state));
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msg.size = sizeof(m.state);
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need_reply = 1;
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break;
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case VHOST_SET_VRING_ADDR:
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memcpy(&msg.addr, arg, sizeof(struct vhost_vring_addr));
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msg.size = sizeof(m.addr);
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break;
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case VHOST_SET_VRING_KICK:
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case VHOST_SET_VRING_CALL:
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case VHOST_SET_VRING_ERR:
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file = arg;
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msg.u64 = file->index & VHOST_USER_VRING_IDX_MASK;
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msg.size = sizeof(m.u64);
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if (ioeventfd_enabled() && file->fd > 0) {
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fds[fd_num++] = file->fd;
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} else {
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msg.u64 |= VHOST_USER_VRING_NOFD_MASK;
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}
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break;
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default:
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error_report("vhost-user trying to send unhandled ioctl\n");
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return -1;
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break;
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}
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if (vhost_user_write(dev, &msg, fds, fd_num) < 0) {
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return 0;
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}
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if (need_reply) {
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if (vhost_user_read(dev, &msg) < 0) {
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return 0;
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}
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if (msg_request != msg.request) {
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error_report("Received unexpected msg type."
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" Expected %d received %d\n", msg_request, msg.request);
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return -1;
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}
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switch (msg_request) {
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case VHOST_USER_GET_FEATURES:
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if (msg.size != sizeof(m.u64)) {
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error_report("Received bad msg size.\n");
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return -1;
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}
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*((__u64 *) arg) = msg.u64;
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break;
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case VHOST_USER_GET_VRING_BASE:
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if (msg.size != sizeof(m.state)) {
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error_report("Received bad msg size.\n");
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return -1;
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}
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memcpy(arg, &msg.state, sizeof(struct vhost_vring_state));
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break;
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default:
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error_report("Received unexpected msg type.\n");
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return -1;
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break;
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}
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}
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return 0;
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}
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static int vhost_user_init(struct vhost_dev *dev, void *opaque)
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{
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assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
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dev->opaque = opaque;
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return 0;
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}
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static int vhost_user_cleanup(struct vhost_dev *dev)
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{
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assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
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dev->opaque = 0;
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return 0;
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}
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const VhostOps user_ops = {
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.backend_type = VHOST_BACKEND_TYPE_USER,
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.vhost_call = vhost_user_call,
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.vhost_backend_init = vhost_user_init,
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.vhost_backend_cleanup = vhost_user_cleanup
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};
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