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-rw-r--r--lib/librte_vhost/vhost_user.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index d25e1c02..80348dbf 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -39,6 +39,7 @@
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
+#include <stdbool.h>
#include <assert.h>
#ifdef RTE_LIBRTE_VHOST_NUMA
#include <numaif.h>
@@ -488,6 +489,30 @@ dump_guest_pages(struct virtio_net *dev)
#define dump_guest_pages(dev)
#endif
+static bool
+vhost_memory_changed(struct VhostUserMemory *new,
+ struct virtio_memory *old)
+{
+ uint32_t i;
+
+ if (new->nregions != old->nregions)
+ return true;
+
+ for (i = 0; i < new->nregions; ++i) {
+ VhostUserMemoryRegion *new_r = &new->regions[i];
+ struct virtio_memory_region *old_r = &old->regions[i];
+
+ if (new_r->guest_phys_addr != old_r->guest_phys_addr)
+ return true;
+ if (new_r->memory_size != old_r->size)
+ return true;
+ if (new_r->userspace_addr != old_r->guest_user_addr)
+ return true;
+ }
+
+ return false;
+}
+
static int
vhost_user_set_mem_table(struct virtio_net *dev, struct VhostUserMsg *pmsg)
{
@@ -500,6 +525,16 @@ vhost_user_set_mem_table(struct virtio_net *dev, struct VhostUserMsg *pmsg)
uint32_t i;
int fd;
+ if (dev->mem && !vhost_memory_changed(&memory, dev->mem)) {
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "(%d) memory regions not changed\n", dev->vid);
+
+ for (i = 0; i < memory.nregions; i++)
+ close(pmsg->fds[i]);
+
+ return 0;
+ }
+
/* Remove from the data plane. */
if (dev->flags & VIRTIO_DEV_RUNNING) {
dev->flags &= ~VIRTIO_DEV_RUNNING;
@@ -917,12 +952,47 @@ send_vhost_message(int sockfd, struct VhostUserMsg *msg)
return ret;
}
+static void
+vhost_user_lock_all_queue_pairs(struct virtio_net *dev)
+{
+ unsigned int i = 0;
+ unsigned int vq_num = 0;
+
+ while (vq_num < dev->virt_qp_nb * 2) {
+ struct vhost_virtqueue *vq = dev->virtqueue[i];
+
+ if (vq) {
+ rte_spinlock_lock(&vq->access_lock);
+ vq_num++;
+ }
+ i++;
+ }
+}
+
+static void
+vhost_user_unlock_all_queue_pairs(struct virtio_net *dev)
+{
+ unsigned int i = 0;
+ unsigned int vq_num = 0;
+
+ while (vq_num < dev->virt_qp_nb * 2) {
+ struct vhost_virtqueue *vq = dev->virtqueue[i];
+
+ if (vq) {
+ rte_spinlock_unlock(&vq->access_lock);
+ vq_num++;
+ }
+ i++;
+ }
+}
+
int
vhost_user_msg_handler(int vid, int fd)
{
struct virtio_net *dev;
struct VhostUserMsg msg;
int ret;
+ int unlock_required = 0;
dev = get_device(vid);
if (dev == NULL)
@@ -945,6 +1015,37 @@ vhost_user_msg_handler(int vid, int fd)
RTE_LOG(INFO, VHOST_CONFIG, "read message %s\n",
vhost_message_str[msg.request]);
+
+ /*
+ * Note: we don't lock all queues on VHOST_USER_GET_VRING_BASE
+ * and VHOST_USER_RESET_OWNER, since it is sent when virtio stops
+ * and device is destroyed. destroy_device waits for queues to be
+ * inactive, so it is safe. Otherwise taking the access_lock
+ * would cause a dead lock.
+ */
+ switch (msg.request) {
+ case VHOST_USER_SET_FEATURES:
+ case VHOST_USER_SET_PROTOCOL_FEATURES:
+ case VHOST_USER_SET_OWNER:
+ case VHOST_USER_SET_MEM_TABLE:
+ case VHOST_USER_SET_LOG_BASE:
+ case VHOST_USER_SET_LOG_FD:
+ case VHOST_USER_SET_VRING_NUM:
+ case VHOST_USER_SET_VRING_ADDR:
+ case VHOST_USER_SET_VRING_BASE:
+ case VHOST_USER_SET_VRING_KICK:
+ case VHOST_USER_SET_VRING_CALL:
+ case VHOST_USER_SET_VRING_ERR:
+ case VHOST_USER_SET_VRING_ENABLE:
+ case VHOST_USER_SEND_RARP:
+ vhost_user_lock_all_queue_pairs(dev);
+ unlock_required = 1;
+ break;
+ default:
+ break;
+
+ }
+
switch (msg.request) {
case VHOST_USER_GET_FEATURES:
msg.payload.u64 = vhost_user_get_features();
@@ -1034,5 +1135,8 @@ vhost_user_msg_handler(int vid, int fd)
}
+ if (unlock_required)
+ vhost_user_unlock_all_queue_pairs(dev);
+
return 0;
}