Re: kvm: Unknown error 524, Fail to handle apic access vmexit

["Yang, Sheng" <sheng.yang@intel.com>]

On Tuesday 15 July 2008 23:19:07 Dor Laor wrote:
> Martin Michlmayr wrote:
> > I installed a Windows XP SP2 guest on a Debian x86_64 host The
> > installation itself went fine but kvm aborts when when XP starts
> > during "Windows XP Setup".  XP mentions something with
> > intelppm.sys (see the attached screenshot) and kvm says:
> >
> > kvm_run: Unknown error 524
> > kvm_run returned -524
>
> It's a FlexPriority bug, while it should be solved, you can disable
> it by using kvm-intel module parameter.
>

Dor, are you sure it's a FlexPriority bug? 

If you look at where is the complain, you would find there is a result 
of emulate_instruction().

And you will find a clearly "emulation failed (mmio) rip 7cb3d000 ff 
ff 8d 85" in the bug tracker Martin metioned above the "Fail to 
handle apic access vmexit! Offset is 0xf0"(Spurious Interrupt Vector 
Register).

I don't think "ff ff 8d 85" is a vaild opcode for that case.

Maybe it's a regression? The last report is long ago...

Hi Martin, can you show more dmesg here? And if it can be reproduce 
stable?

Thanks.

-- 
regards
Yang, Sheng

> > In dmesg, I see:
> >
> > [ 8891.352876] Fail to handle apic access vmexit! Offset is 0xf0
> >
> > This happens with kvm 70, and kernel 2.6.25 and 2.6.26-rc9.
> >
> > Someone else reported a similar problem before but there was no
> > response:
> > http://www.mail-archive.com/kvm-devel@lists.sourceforge.net/msg12
> >111.html
> >
> >
> >
> > -----------------------------------------------------------------
> >-------
>
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