Re: HVM pvops failures

[Jeremy Fitzhardinge <jeremy@goop.org>]

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Ian Jackson wrote:
> Andrew Lyon writes ("Re: [Xen-devel] HVM guest question (was Re: [PATCH] ioemu: Cleanup the code of PCI passthrough.)"):
>   
>> On Mon, Feb 23, 2009 at 2:53 PM, Ian Jackson <Ian.Jackson@eu.citrix.com> wrote:
>>     
>>> These messages are not very surprising.  Is it working ?
>>>       
>> No, when try to start HVM on Xen unstable with pv_ops kernel I get this error:
>>     
>
> Ah.  This is rather odd.  Normally I would hope that xend would report
> an exit status.  (I haven't tried pvops with qemu.)
>
>   
Hm, I'm getting:
[2009-02-23 15:26:18 4380] WARNING (image:482) domain win7: device model 
failure: pid 5409: died due to signal 7; see /var/log/xen/qemu-dm-win7.log

Hm, signal 7 - SIGBUS.  I wonder if

Using stub domains doesn't work either.

> I would suggest running qemu-dm under strace.  This can be done easily
> enough with a simple wrapper script, something like:
>   #!/bin/sh
>   set -e
>   exec strace -vvs500 -f -o /root/qemu-dm.strace \
>     /usr/lib/xen/bin/qemu-dm "$@"
> and then give the name of the script as device_model in your config file.
>   
I see:

...
5079  ioctl(10, EVIOCGKEYCODE, 0x7fffdfd52b70) = 0
5079  clock_gettime(CLOCK_MONOTONIC, {1324, 539747423}) = 0
5079  clock_gettime(CLOCK_MONOTONIC, {1324, 539837298}) = 0
5079  select(14, [3 6 10 11 13], [], [], {0, 10000}) = 1 (in [10], left {0, 9995})
5079  read(10, "\36\0\0\0"..., 4)       = 4
5079  write(10, "\36\0\0\0"..., 4)      = 4
5079  ioctl(10, EVIOCGKEYCODE, 0x7fffdfd52b70) = 0
5079  clock_gettime(CLOCK_MONOTONIC, {1324, 540495964}) = 0
5079  clock_gettime(CLOCK_MONOTONIC, {1324, 540591278}) = 0
5079  select(14, [3 6 10 11 13], [], [], {0, 10000}) = 1 (in [10], left {0, 9995})
5079  read(10, "\36\0\0\0"..., 4)       = 4
5079  write(10, "\36\0\0\0"..., 4)      = 4
5079  mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_SHARED, 4, 0) = 0x7f1ad5f2b000
5079  ioctl(4, SNDCTL_DSP_STEREO, 0x7fffdfd52230) = 0
5079  --- SIGBUS (Bus error) @ 0 (0) ---
5157  +++ killed by SIGBUS +++


This mmap and ioctl is from /proc/xen/privcmd.

    J

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