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87b22e3839
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> |
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