Each ioctl request of vhost-kernel has a vhost-user message equivalent,
which is sent over the control socket.
The general approach is to copy the data from the supplied argument
pointer to a designated field in the message. If a file descriptor is
to be passed it will be placed in the fds array for inclusion in
the sendmsd control header.
VHOST_SET_MEM_TABLE ignores the supplied vhost_memory structure and scans
the global ram_list for ram blocks with a valid fd field set. This would
be set when the -mem-path option with shared=on property is used.
Signed-off-by: Antonios Motakis <a.mota...@virtualopensystems.com>
Signed-off-by: Nikolay Nikolaev <n.nikol...@virtualopensystems.com>
---
hw/virtio/vhost-backend.c | 147 ++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 143 insertions(+), 4 deletions(-)
diff --git a/hw/virtio/vhost-backend.c b/hw/virtio/vhost-backend.c
index 460ee02..8f98562 100644
--- a/hw/virtio/vhost-backend.c
+++ b/hw/virtio/vhost-backend.c
@@ -81,6 +81,39 @@ static VhostUserMsg m __attribute__ ((unused));
/* The version of the protocol we support */
#define VHOST_USER_VERSION (0x1)
+static unsigned long int ioctl_to_vhost_user_request[VHOST_USER_MAX] = {
+ -1, /* VHOST_USER_NONE */
+ VHOST_GET_FEATURES, /* VHOST_USER_GET_FEATURES */
+ VHOST_SET_FEATURES, /* VHOST_USER_SET_FEATURES */
+ VHOST_SET_OWNER, /* VHOST_USER_SET_OWNER */
+ VHOST_RESET_OWNER, /* VHOST_USER_RESET_OWNER */
+ VHOST_SET_MEM_TABLE, /* VHOST_USER_SET_MEM_TABLE */
+ VHOST_SET_LOG_BASE, /* VHOST_USER_SET_LOG_BASE */
+ VHOST_SET_LOG_FD, /* VHOST_USER_SET_LOG_FD */
+ VHOST_SET_VRING_NUM, /* VHOST_USER_SET_VRING_NUM */
+ VHOST_SET_VRING_ADDR, /* VHOST_USER_SET_VRING_ADDR */
+ VHOST_SET_VRING_BASE, /* VHOST_USER_SET_VRING_BASE */
+ VHOST_GET_VRING_BASE, /* VHOST_USER_GET_VRING_BASE */
+ VHOST_SET_VRING_KICK, /* VHOST_USER_SET_VRING_KICK */
+ VHOST_SET_VRING_CALL, /* VHOST_USER_SET_VRING_CALL */
+ VHOST_SET_VRING_ERR, /* VHOST_USER_SET_VRING_ERR */
+ VHOST_NET_SET_BACKEND, /* VHOST_USER_NET_SET_BACKEND */
+ -1 /* VHOST_USER_ECHO */
+};
+
+static VhostUserRequest vhost_user_request_translate(unsigned long int request)
+{
+ VhostUserRequest idx;
+
+ for (idx = 0; idx < VHOST_USER_MAX; idx++) {
+ if (ioctl_to_vhost_user_request[idx] == request) {
+ break;
+ }
+ }
+
+ return (idx == VHOST_USER_MAX) ? VHOST_USER_NONE : idx;
+}
+
static int vhost_user_recv(int fd, VhostUserMsg *msg)
{
ssize_t r;
@@ -235,7 +268,10 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned
long int request,
{
int fd = dev->control;
VhostUserMsg msg;
- int result = 0;
+ VhostUserRequest msg_request;
+ RAMBlock *block = 0;
+ struct vhost_vring_file *file = 0;
+ int need_reply = 0;
int fds[VHOST_MEMORY_MAX_NREGIONS];
size_t fd_num = 0;
@@ -245,20 +281,123 @@ static int vhost_user_call(struct vhost_dev *dev,
unsigned long int request,
return 0;
}
- msg.request = VHOST_USER_NONE;
+ msg_request = vhost_user_request_translate(request);
+ msg.request = msg_request;
msg.flags = VHOST_USER_VERSION;
msg.size = 0;
switch (request) {
+ case VHOST_GET_FEATURES:
+ case VHOST_GET_VRING_BASE:
+ need_reply = 1;
+ break;
+
+ case VHOST_SET_FEATURES:
+ case VHOST_SET_LOG_BASE:
+ msg.u64 = *((__u64 *) arg);
+ msg.size = sizeof(m.u64);
+ break;
+
+ case VHOST_SET_OWNER:
+ case VHOST_RESET_OWNER:
+ break;
+
+ case VHOST_SET_MEM_TABLE:
+ QTAILQ_FOREACH(block, &ram_list.blocks, next)
+ {
+ if (block->fd > 0) {
+ msg.memory.regions[fd_num].userspace_addr = (__u64)
block->host;
+ msg.memory.regions[fd_num].memory_size = block->length;
+ msg.memory.regions[fd_num].guest_phys_addr = block->offset;
+ fds[fd_num++] = block->fd;
+ }
+ }
+
+ msg.memory.nregions = fd_num;
+
+ if (!fd_num) {
+ error_report("Failed initializing vhost-user memory map\n"
+ "consider using -mem-path option\n");
+ return -1;
+ }
+
+ msg.size = sizeof(m.memory.nregions);
+ msg.size += sizeof(m.memory.padding);
+ msg.size += fd_num * sizeof(VhostUserMemoryRegion);
+
+ break;
+
+ case VHOST_SET_LOG_FD:
+ fds[fd_num++] = *((int *) arg);
+ break;
+
+ case VHOST_SET_VRING_NUM:
+ case VHOST_SET_VRING_BASE:
+ memcpy(&msg.state, arg, sizeof(struct vhost_vring_state));
+ msg.size = sizeof(m.state);
+ break;
+
+ case VHOST_SET_VRING_ADDR:
+ memcpy(&msg.addr, arg, sizeof(struct vhost_vring_addr));
+ msg.size = sizeof(m.addr);
+ break;
+
+ case VHOST_SET_VRING_KICK:
+ case VHOST_SET_VRING_CALL:
+ case VHOST_SET_VRING_ERR:
+ case VHOST_NET_SET_BACKEND:
+ file = arg;
+ msg.u64 = file->index;
+ msg.size = sizeof(m.u64);
+ if (file->fd > 0) {
+ fds[fd_num++] = file->fd;
+ }
+ break;
default:
error_report("vhost-user trying to send unhandled ioctl\n");
return -1;
break;
}
- result = vhost_user_send_fds(fd, &msg, fds, fd_num);
+ if (vhost_user_send_fds(fd, &msg, fds, fd_num) < 0) {
+ return -1;
+ }
- return result;
+ if (need_reply) {
+ if (vhost_user_recv(fd, &msg) < 0) {
+ return -1;
+ }
+
+ if (msg_request != msg.request) {
+ error_report("Received unexpected msg type."
+ " Expected %d received %d\n",
+ msg_request, msg.request);
+ return -1;
+ }
+
+ switch (msg_request) {
+ case VHOST_USER_GET_FEATURES:
+ if (msg.size != sizeof(m.u64)) {
+ error_report("Received bad msg size.\n");
+ return -1;
+ }
+ *((__u64 *) arg) = msg.u64;
+ break;
+ case VHOST_USER_GET_VRING_BASE:
+ if (msg.size != sizeof(m.state)) {
+ error_report("Received bad msg size.\n");
+ return -1;
+ }
+ memcpy(arg, &msg.state, sizeof(struct vhost_vring_state));
+ break;
+ default:
+ error_report("Received unexpected msg type.\n");
+ return -1;
+ break;
+ }
+ }
+
+ return 0;
}
static int vhost_user_init(struct vhost_dev *dev, const char *devpath)
--
1.8.3.2
