diff options
| -rw-r--r-- | hw/virtio/vhost-user.c | 20 | ||||
| -rw-r--r-- | hw/virtio/vhost.c | 7 | ||||
| -rw-r--r-- | include/hw/virtio/vhost-backend.h | 4 |
3 files changed, 31 insertions, 0 deletions
diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 7fde137..7ed3dd9 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -611,6 +611,25 @@ static int vhost_user_migration_done(struct vhost_dev *dev, char* mac_addr) return -1; } +static bool vhost_user_can_merge(struct vhost_dev *dev, + uint64_t start1, uint64_t size1, + uint64_t start2, uint64_t size2) +{ + ram_addr_t ram_addr; + int mfd, rfd; + MemoryRegion *mr; + + mr = qemu_ram_addr_from_host((void *)(uintptr_t)start1, &ram_addr); + assert(mr); + mfd = qemu_get_ram_fd(ram_addr); + + mr = qemu_ram_addr_from_host((void *)(uintptr_t)start2, &ram_addr); + assert(mr); + rfd = qemu_get_ram_fd(ram_addr); + + return mfd == rfd; +} + const VhostOps user_ops = { .backend_type = VHOST_BACKEND_TYPE_USER, .vhost_backend_init = vhost_user_init, @@ -633,4 +652,5 @@ const VhostOps user_ops = { .vhost_set_vring_enable = vhost_user_set_vring_enable, .vhost_requires_shm_log = vhost_user_requires_shm_log, .vhost_migration_done = vhost_user_migration_done, + .vhost_backend_can_merge = vhost_user_can_merge, }; diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index 72d0c9e..392d848 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -260,6 +260,13 @@ static void vhost_dev_assign_memory(struct vhost_dev *dev, continue; } + if (dev->vhost_ops->vhost_backend_can_merge && + !dev->vhost_ops->vhost_backend_can_merge(dev, uaddr, size, + reg->userspace_addr, + reg->memory_size)) { + continue; + } + if (merged) { --to; assert(to >= 0); diff --git a/include/hw/virtio/vhost-backend.h b/include/hw/virtio/vhost-backend.h index c59cc81..a6e5c97 100644 --- a/include/hw/virtio/vhost-backend.h +++ b/include/hw/virtio/vhost-backend.h @@ -70,6 +70,9 @@ typedef int (*vhost_set_vring_enable_op)(struct vhost_dev *dev, typedef bool (*vhost_requires_shm_log_op)(struct vhost_dev *dev); typedef int (*vhost_migration_done_op)(struct vhost_dev *dev, char *mac_addr); +typedef bool (*vhost_backend_can_merge_op)(struct vhost_dev *dev, + uint64_t start1, uint64_t size1, + uint64_t start2, uint64_t size2); typedef struct VhostOps { VhostBackendType backend_type; @@ -97,6 +100,7 @@ typedef struct VhostOps { vhost_set_vring_enable_op vhost_set_vring_enable; vhost_requires_shm_log_op vhost_requires_shm_log; vhost_migration_done_op vhost_migration_done; + vhost_backend_can_merge_op vhost_backend_can_merge; } VhostOps; extern const VhostOps user_ops; |