Need your help with blktap

Need your help with blktap

[王凯强]

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Hello,

I have a small problem with the blktap, that when I use "tap:aio" protocol
to access my disk, the domU stop booting with following message:

[    0.185031] PCI: Fatal: No config space access function found
[    0.189998] Unable to read sysrq code in control/sysrq
[    0.350220] i8042: No controller found
[    0.452153]
/home/abuild/rpmbuild/BUILD/kernel-xen-3.1.0/linux-3.1/drivers/rtc/hctosys.c:
unable to open rtc device (rtc0)


but when i switched to then "file" protocol the domU boot process would
succeed. Anyone knows how to solve this problem?


=============================================
Additional info:

I'm using openSUSE 12.1 x86_64
and i'v built the xen from source by myself,
the kernel i'm using is "kernel-xen"(3.1.10-1.9-xen) from official
repositories.

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Re: Need your help with blktap

[Pasi Kärkkäinen]

On Tue, May 22, 2012 at 04:43:40PM +0800, ????????? wrote:
>    Hello,
> 

Hello,

>    I have a small problem with the blktap, that when I use "tap:aio" protocol
>    to access my disk, the domU stop booting with following message:
> 
>    [    0.185031] PCI: Fatal: No config space access function found
>    [    0.189998] Unable to read sysrq code in control/sysrq
>    [    0.350220] i8042: No controller found
>    [    0.452153]
>    /home/abuild/rpmbuild/BUILD/kernel-xen-3.1.0/linux-3.1/drivers/rtc/hctosys.c:
>    unable to open rtc device (rtc0)
> 

Can you please post the full domU dmesg? Remove any "quiet" etc options.
I assume this is a PV domU ?


>    but when i switched to then "file" protocol the domU boot process would
>    succeed. Anyone knows how to solve this problem?
> 

Sounds like something is broken in your dom0 configuration.

>    =============================================
>    Additional info:
> 
>    I'm using openSUSE 12.1 x86_64
>    and i'v built the xen from source by myself,
>    the kernel i'm using is "kernel-xen"(3.1.10-1.9-xen) from official
>    repositories.

Does it work if you also use Xen from official repositories? 

What's in your dom0 kernel "dmesg"? How about in "xm log" or "xm dmesg" ?
Do you have blktap driver loaded in dom0 kernel? 

-- Pasi