Re: [Xen-devel] [PATCH 2/2] mwait_idle: Broadwell support

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 16.10.14 at 14:54, <tiejun.chen@xxxxxxxxx> wrote:
> Did you guys validate this in real machine? Or any potential side affect?
> 
> When I do IGD GFX passthrough with qemu-xen-traditional, I found in the 
> boot phase of VM, the target will reboot. After I revert this everything 
> is fine.

Please be more precise. What is "target" here? Host? Guest?
Also, reporting issues just verbally (i.e. without any logs or other
actual technical information) rarely makes a lot of sense.

> Note I don't add anything into codes. Here I just build Xen unstable 4.5 
> to use qemu-xen-traditional. And additionally, my BDW is based on 
> stepping E, and guest is WindXP.

But the change is only about C-state handling for a particular
CPU model. There's really nothing being added that doesn't
already work fine elsewhere. I.e. this patch being the apparent
culprit of a problem you see makes it relatively likely that your
hardware is having some issue.

Jan


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