[Qemu-devel] [PATCH] Re: KQEMU error, unable to get major 254

[Qemu-devel] [PATCH] Re: KQEMU error, unable to get major 254

[Jean-Christian de Rivaz]

 > Can someone tell where do you "officially" can request a major number
 > these days? (if it's possible)..

See Documentation/devices.txt in the kernel project.
Major number from 232 to 239 seem to be unassigned yet. You can maybe 
pick one of them and send a patch to Linux to update the document.

Have a good day,
-- 
Jean-Christian de Rivaz
mailto:jc@eclis.ch
tel:+41-78-657-7442

Re: [Qemu-devel] [PATCH] Re: KQEMU error, unable to get major 254

[Paul Brook]

On Saturday 12 February 2005 00:23, Jean-Christian de Rivaz wrote:
>  > Can someone tell where do you "officially" can request a major number
>  > these days? (if it's possible)..
>
> See Documentation/devices.txt in the kernel project.
> Major number from 232 to 239 seem to be unassigned yet. You can maybe
> pick one of them and send a patch to Linux to update the document.

Why does qemu need a major number anyway? Wouldn't it be better to use a minor 
number from the "misc" class (major 10).

Specifically major 10, minor 240-254 are "reserved for local use", so it 
should be safe to use those until such time as qemu gets an official device 
id.

Paul

[Qemu-devel] KQEMU error, unable to get major 254

[Darryl Dixon]

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Hi Fabrice,

    I have managed to download the latest cvs and tried it out on Fedora
Core 3 (kernel 2.6.10).  It seems that for some reason the kqemu module
is unable to be assigned major device number 254.  Below are the errors:
[root@localhost ~]# modprobe kqemu
FATAL: Error inserting kqemu
(/lib/modules/2.6.10-1.760_FC3/misc/kqemu.ko): Device or resource busy
[root@localhost ~]# tail /var/log/messages
Feb 11 14:14:07 localhost kernel: QEMU Accelerator Module version 1.0.0,
Copyright (c) 2005 Fabrice Bellard
Feb 11 14:14:07 localhost kernel: This is a proprietary product. Read
the LICENSE file for more information
Feb 11 14:14:07 localhost kernel: Redistribution of this module is
prohibited without authorization
Feb 11 14:14:07 localhost kernel: kqemu: could not get major 254


Regards,
-- 
Darryl Dixon <esrever_otua@pythonhacker.is-a-geek.net>

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[Qemu-devel] [PATCH] Re: KQEMU error, unable to get major 254

[Darryl Dixon]

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I have worked around this temporarily with the following patch:

diff -ru qemu/kqemu/install.sh qemu_major250/kqemu/install.sh
--- qemu/kqemu/install.sh       2005-02-11 11:10:28.000000000 +1300
+++ qemu_major250/kqemu/install.sh      2005-02-11 14:24:04.000000000
+1300
@@ -20,5 +20,5 @@
 # Create the kqemu device. No special priviledge is needed to use
kqemu.
 device="/dev/kqemu"
 rm -f $device
-mknod $device c 254 0
+mknod $device c 250 0
 chmod 666 $device
Only in qemu_major250/kqemu: .kmod.o.cmd
diff -ru qemu/kqemu/kqemu.h qemu_major250/kqemu/kqemu.h
--- qemu/kqemu/kqemu.h  2005-02-11 11:10:28.000000000 +1300
+++ qemu_major250/kqemu/kqemu.h 2005-02-11 14:23:46.000000000 +1300
@@ -1,7 +1,7 @@
 #ifndef KQEMU_H
 #define KQEMU_H

-#define KQEMU_MAJOR 254
+#define KQEMU_MAJOR 250

 #define KQEMU_VERSION 0x010000



Cheers,
D




On Fri, 2005-02-11 at 14:19 +1300, Darryl Dixon wrote:

> Hi Fabrice,
> 
>     I have managed to download the latest cvs and tried it out on
> Fedora Core 3 (kernel 2.6.10).  It seems that for some reason the
> kqemu module is unable to be assigned major device number 254.  Below
> are the errors:
> [root@localhost ~]# modprobe kqemu
> FATAL: Error inserting kqemu
> (/lib/modules/2.6.10-1.760_FC3/misc/kqemu.ko): Device or resource busy
> [root@localhost ~]# tail /var/log/messages
> Feb 11 14:14:07 localhost kernel: QEMU Accelerator Module version
> 1.0.0, Copyright (c) 2005 Fabrice Bellard
> Feb 11 14:14:07 localhost kernel: This is a proprietary product. Read
> the LICENSE file for more information
> Feb 11 14:14:07 localhost kernel: Redistribution of this module is
> prohibited without authorization
> Feb 11 14:14:07 localhost kernel: kqemu: could not get major 254
> 
> 
> Regards,
> -- 
> Darryl Dixon <esrever_otua@pythonhacker.is-a-geek.net>

-- 
Darryl Dixon <esrever_otua@pythonhacker.is-a-geek.net>

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