linux-kernel - Re: [V9fs-developer] Unable to load modules from 9p filesystem with kmod 16

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Message-ID: <20140111121914.GA12907@nautica>
Date:	Sat, 11 Jan 2014 13:19:14 +0100
From:	Dominique Martinet <dominique.martinet@....fr>
To:	Randy Dunlap <rdunlap@...radead.org>,
	Wakko Warner <wakko@...mx.eu.org>
Cc:	linux-kernel@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
	Rusty Russell <rusty@...tcorp.com.au>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [V9fs-developer] Unable to load modules from 9p filesystem with
 kmod 16

Hi,

Randy Dunlap wrote on Fri, Jan 10, 2014 :
> [adding Cc:s]

Thanks for the extra Cc.

> On 01/10/2014 03:03 PM, Wakko Warner wrote:
> > Wakko Warner wrote:
> >> Kernel 3.12.7 from kernel.org
> >> With kmod-16, I'm unable to load any modules on my guest kvm machines.
> >> The vm is booted via direct kernel boot.  The modules are located on the
> >> host and is passed to the guest via the fsdev.
> >>
> >> I have a mountpoint on the guest filesystem located at /kernel.  It is
> >> mounted like this:
> >> kernel /kernel 9p rw,sync,dirsync,relatime,trans=virtio,version=9p2000.L 0 0
> >>
> >> /boot, /lib/modules, and /lib/firmware are tmpfs filesystems like this:
> >> kboot /boot tmpfs rw,relatime,size=0k,nr_inodes=8 0 0
> >> kfirmware /lib/firmware tmpfs rw,relatime,size=0k,nr_inodes=8 0 0
> >> kmodules /lib/modules tmpfs rw,relatime,size=0k,nr_inodes=8 0 0
> >>
> >> /lib/modules/$(uname -r) is a symlink to /kernel/lib/modules/$(uname -r)
> >>
> >> When trying to load any module, I get 
> >> Error: could not insert module /lib/modules/3.12.7/kernel/crypto/af_alg.ko:
> >> Invalid module format
> >>
> >> This module was just one I picked at random, all modules fail the same way.
> >> Strace shows this:
> >> open("/lib/modules/3.12.7/kernel/crypto/af_alg.ko", O_RDONLY|O_CLOEXEC) = 3
> >> fstat(3, {st_mode=S_IFREG|0644, st_size=13822, ...}) = 0
> >> mmap(NULL, 13822, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f199aebd000
> >> syscall_313(0x3, 0x7f199aaa2de0, 0, 0x3, 0, 0x7f199b7b2010, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) = -1 (errno 8)
> >> munmap(0x7f199aebd000, 13822)           = 0
> >> close(3)                                = 0

I didn't look at the patch very closely because the mail apparently
never reached v9fs-developer (although it looks in copy), but I got
pointed out this patch recently:
http://www.spinics.net/lists/linux-virtualization/msg21716.html

Which quotes "This patch enables 9p-virtio to correctly handle this
case. This not only enables us to load Linux kernel modules off virtfs,"

Perhaps would it be what you need to support this syscall_313?

Good luck,
-- 
Dominique Martinet
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