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-rw-r--r--hw/virtio/vhost-user.c20
-rw-r--r--hw/virtio/vhost.c7
2 files changed, 27 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);