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authorChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:07 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:17 +0200
commit9260319e7411ff8281700a532caa436f40120ec4 (patch)
tree2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues_text/target_missing/host_missing/accel_missing/2341
parent225caa38269323af1bfc2daadff5ec8bd930747f (diff)
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+IVSHMEM device doesn't work for sharing memory with virtiofsd
+Description of problem:
+Trying to share a folder on the host to the guest with `virtiofsd` using the `ivshmem-plain` device doesn't work (for memory sharing), while using a NUMA node (with `-numa node,memdev=mem`) works just fine.
+Steps to reproduce:
+1. Install `virtiofsd`
+2. Run `/usr/libexec/virtiofsd --socket-path=/tmp/vhostqemu --shared-dir=$HOME --cache always` as a regular user (or with another shared directory, it doesn't matter)
+3. Run QEMU with the aforementioned command line as a regular user
+4. Wait a bit for the OS to load and `virtiofsd` should error out
+Additional information:
+`virtiofsd` logs:
+```
+[2024-05-09T19:49:15Z WARN  virtiofsd::sandbox] Couldn't set the process uid as root: -1
+[2024-05-09T19:49:15Z WARN  virtiofsd::sandbox] Couldn't set the process gid as root: -1
+[2024-05-09T19:49:15Z INFO  virtiofsd] Waiting for vhost-user socket connection...
+[2024-05-09T19:49:16Z INFO  virtiofsd] Client connected, servicing requests
+[2024-05-09T19:49:22Z ERROR virtiofsd] Waiting for daemon failed: HandleRequest(ReqHandlerError(Custom { kind: Other, error: MissingMemoryMapping }))
+```
+
+QEMU logs (after virtiofsd errors out and exits):
+```
+qemu: Failed to read msg header. Read -1 instead of 12. Original request 0.
+qemu: Failed to write msg. Wrote -1 instead of 20.
+qemu: vhost VQ 1 ring restore failed: -22: Invalid argument (22)
+qemu: Failed to set msg fds.
+qemu: vhost VQ 0 ring restore failed: -22: Invalid argument (22)
+qemu: Error starting vhost: 5
+qemu: Failed to set msg fds.
+qemu: vhost_set_vring_call failed 22
+qemu: Failed to set msg fds.
+qemu: vhost_set_vring_call failed 22
+qemu: Unexpected end-of-file before all data were read
+```