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Re: [Xen-devel] (no subject)

From: Francisco Rocha
Sent: 05 April 2012 21:43
To: wei.huang2@xxxxxxx
Cc: Andrew Cooper; xen-devel@xxxxxxxxxxxxx
Subject: RE: [Xen-devel] (no subject)

From: Wei Huang [wei.huang2@xxxxxxx]
Sent: 05 April 2012 21:27
To: Francisco Rocha
Cc: Andrew Cooper; xen-devel@xxxxxxxxxxxxx
Subject: Re: [Xen-devel] (no subject)

On 04/05/2012 03:17 PM, Francisco Rocha wrote:
> ________________________________________
> From: Wei Huang [wei.huang2@xxxxxxx]
> Sent: 05 April 2012 20:36
> To: Francisco Rocha
> Cc: Andrew Cooper; xen-devel@xxxxxxxxxxxxx
> Subject: Re: [Xen-devel] (no subject)
> On 04/05/2012 01:26 PM, Francisco Rocha wrote:
>> Date: Thu, 5 Apr 2012 18:44:14 +0100
>> From: Andrew Cooper<andrew.cooper3@xxxxxxxxxx>
>> To:<xen-devel@xxxxxxxxxxxxx>
>> Subject: Re: [Xen-devel] lastest xen unstable crash
>> Message-ID:<4F7DD9EE.3080404@xxxxxxxxxx>
>> Content-Type: text/plain; charset="ISO-8859-1"
>> On 05/04/12 18:37, Francisco Rocha wrote:
>>> Hi everyone,
>>> I was trying to build a new machine but the system keeps rebooting.
>>> I used the lasted unstable version from xen-unstable.hg.
>>> I have tried with Fedora 16 (kernel 3.3.0-8) and Xubuntu 11.10 
>>> (
>>> The output to my serial console is attached.
>>> Cheers,
>>> Francisco
>> What is your Linux command line? does it include "console=hvc0"?
>> Perhaps some early_printk settings are required.
>> Please include my email in your replies, thank you.
>> Yes, it includes hvc0. I used your tutorial to setup the SOL.
>> title        Xen 3.4.2 / pv_ops Linux dom0 with a serial console
>> root         (hd0,0)
>> kernel       /xen-3.4.gz dom0_mem=512M loglvl=all guest_loglvl=all 
>> sync_console console_to_ring com1=115200,8n1,0xe000,0 console=com1
>> module       /vmlinuz- ro root=/dev/vg00/lv01 console=hvc0 
>> earlyprintk=xen nomodeset
>> module       /initrd-
>> Something like this, I am not at the machine anymore.
>> Francisco
> It looks like xsave/xrstore instructions (xsetbv instruction in
> xstate_enable() function to be exact) related. You can try to disable
> xsave to to see if this helps.
> -Wei
> Sorry about the untitled message.
> Should I be the one disabling xsave or is that for Andrew to change something?
> How can I do that?
Xen-unstable supports xsave/xrstor. You are using kernel 3.x.x, which
should support xsave/xrstor too. You can try to set xsave=0 in xen.gz
line of grub entry and boot again. Something like this:

kernel /boot/xen.gz blah blah xsave=0
module blah blah

Oh, i see, it's some new functionality. I will try it tomorrow and then let you 
know how it goes.

Thank you for the help.



> Anyway, shouldn't Xen support it?
> cheers,
> Francisco

The xsave=0 command line parameter solves the problem.

Thank you,

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