qemu-server/PVE
Markus Frank 87b22e3839 fix #1027: virtio-fs support
Add support for sharing directories with a guest VM.

virtio-fs needs virtiofsd to be started. In order to start virtiofsd
as a process (despite being a daemon it is does not run in the
background), a double-fork is used.

virtiofsd should close itself together with QEMU.

There are the parameters dirid and the optional parameters direct-io,
cache and writeback. Additionally the expose-xattr & expose-acl
parameter can be set to expose xattr & acl settings from the shared
filesystem to the guest system.

The dirid gets mapped to the path on the current node and is also used
as a mount tag (name used to mount the device on the guest).

example config:
```
virtiofs0: foo,direct-io=1,cache=always,expose-acl=1
virtiofs1: dirid=bar,cache=never,expose-xattr=1,writeback=1
```

For information on the optional parameters see the coherent doc patch
and the official gitlab README:
https://gitlab.com/virtio-fs/virtiofsd/-/blob/main/README.md

Also add a permission check for virtiofs directory access.

Add virtiofsd to the Recommends list for the qemu-server Debian
package, this allows users to opt-out of installing this package, e.g.
for certification reasons.

Signed-off-by: Markus Frank <m.frank@proxmox.com>
Link: https://lore.proxmox.com/20250407134950.265270-3-m.frank@proxmox.com
Tested-by: Lukas Wagner <l.wagner@proxmox.com>
 [TL: squash d/control change and re-add Lukas' T-b, as nothing
  essentially changed from the v16 where his tag applied]
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
2025-04-07 22:30:11 +02:00
..
API2 fix #1027: virtio-fs support 2025-04-07 22:30:11 +02:00
CLI vm stop-cleanup: allow callers to decide error behavior 2025-03-06 16:33:14 +01:00
QemuConfig config: make attempts at writing out NoWrite configs fatal 2025-02-18 15:06:04 +01:00
QemuServer fix #1027: virtio-fs support 2025-04-07 22:30:11 +02:00
VZDump Merge patch series "more robust handling of fleecing images" 2025-04-07 14:13:56 +02:00
Makefile config: add special class that prevents writing the configuration 2025-02-18 15:06:04 +01:00
QemuConfig.pm Merge patch series "more robust handling of fleecing images" 2025-04-07 14:13:56 +02:00
QemuMigrate.pm Merge patch series "more robust handling of fleecing images" 2025-04-07 14:13:56 +02:00
QemuServer.pm fix #1027: virtio-fs support 2025-04-07 22:30:11 +02:00
QMPClient.pm tree-wide: fix various typos in comments 2024-12-05 12:33:24 +01:00