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9p: remove 'proxy' filesystem backend driver

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It has been deprecated since 8.1; remove it and suggest using the 'local' file
system backend driver instead or virtiofsd.

Acked-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2024-09-05 10:19:42 +02:00
parent 7e6b5497ea
commit ed76671888
19 changed files with 14 additions and 2772 deletions
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docs/about/removed-features.rst
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@@ -517,6 +517,20 @@ The virtio-blk SCSI passthrough feature is a legacy VIRTIO feature. VIRTIO 1.0
and later do not support it because the virtio-scsi device was introduced for
full SCSI support. Use virtio-scsi instead when SCSI passthrough is required.
``-fsdev proxy`` and ``-virtfs proxy`` (since 9.2)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The 9p ``proxy`` filesystem backend driver was originally developed to
enhance security by dispatching low level filesystem operations from 9p
server (QEMU process) over to a separate process (the virtfs-proxy-helper
binary). However the proxy backend was much slower than the local backend,
didn't see any development in years, and showed to be less secure,
especially due to the fact that its helper daemon must be run as root.
Use ``local``, possibly mapping permissions et al by using its 'mapped'
security model option, or switch to ``virtiofs``. The virtiofs daemon
``virtiofsd`` uses vhost to eliminate the high latency costs of the 9p
``proxy`` backend.
User-mode emulator command line arguments
-----------------------------------------