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Re: [PATCH] qemu-options.hx: 9p: clarify -virtfs vs. -fsdev
From: |
Christian Schoenebeck |
Subject: |
Re: [PATCH] qemu-options.hx: 9p: clarify -virtfs vs. -fsdev |
Date: |
Tue, 31 Mar 2020 17:41:08 +0200 |
On Dienstag, 31. März 2020 17:27:27 CEST Cornelia Huck wrote:
> > diff --git a/qemu-options.hx b/qemu-options.hx
> > index 962a5ebaa6..fd3830c6cd 100644
> > --- a/qemu-options.hx
> > +++ b/qemu-options.hx
> > @@ -1542,9 +1542,17 @@ SRST
> >
> > ``-virtfs proxy,sock_fd=sock_fd,mount_tag=mount_tag
> > [,writeout=writeout][,readonly]``>
> > \
> >
> > ``-virtfs synth,mount_tag=mount_tag``
> >
> > - Define a new filesystem device and expose it to the guest using a
> > - virtio-9p-device. The general form of a Virtual File system
> > - pass-through options are:
> > + Define a new virtual filesystem device and expose it to the guest
> > using + a virtio-9p-device (a.k.a. 9pfs), which essentially means that
> > a certain + directory on host is made directly accessible by guest as
> > a pass-through + file system by using the 9P network protocol for
> > communication between + host and guests, if desired even accessible,
> > shared by several guests + simultaniously.
> > +
> > + Note that ``-virtfs`` is actually just a convenience shortcut for its
> > + generalized form ``-fsdev -device virtio-9p-pci``.
>
> Huh. This prompted me to try this on s390, and it actually creates a
> virtio-9p-pci device there as well, not a virtio-9p-ccw device. A bit
> surprising; but I don't see 9p used much (if at all) on s390 anyway.
Yeah, "virtio-9p-pci" is currently hard coded in softmmu/vl.c [line 3352]:
https://github.com/qemu/qemu/blob/17083d6d1e0635371418c26b613a6fa68d392f49/softmmu/vl.c#L3352
> > +
> >
> > + The general form of pass-through file system options are:
> > ``local``
> >
> > Accesses to the filesystem are done by QEMU.
>
> Good to see this spelled out:
>
> Acked-by: Cornelia Huck <address@hidden>
Best regards,
Christian Schoenebeck