ivshmem: Store file descriptor for vhost-user negotiation

If virtio-net driver allocates memory in ivshmem shared memory,
vhost-net will work correctly, but vhost-user will not work because
a fd of shared memory will not be sent to vhost-user backend.
This patch fixes ivshmem to store file descriptor of shared memory.
It will be used when vhost-user negotiates vhost-user backend.

Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/exec.c b/exec.c
index 8718a75b64..7f0ce42af0 100644
--- a/exec.c
+++ b/exec.c
@@ -1757,6 +1757,16 @@ int qemu_get_ram_fd(ram_addr_t addr)
     return fd;
 }
 
+void qemu_set_ram_fd(ram_addr_t addr, int fd)
+{
+    RAMBlock *block;
+
+    rcu_read_lock();
+    block = qemu_get_ram_block(addr);
+    block->fd = fd;
+    rcu_read_unlock();
+}
+
 void *qemu_get_ram_block_host_ptr(ram_addr_t addr)
 {
     RAMBlock *block;