Re: [KVM paravirt issue?] Re: vsyscall=emulate regression
From: Andy Lutomirski
Date: Fri Feb 24 2012 - 14:03:54 EST
On Thu, Feb 23, 2012 at 8:34 PM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
> On 02/16/2012 09:39 AM, Avi Kivity wrote:
>>>
>>> Yes, this is on purpose
>
> Why?
I think the "this" refers to the PF_INSTR fault when executing at
0xffffffffff600xxx. That's definitely intentional -- it's how
vsyscall emulation works.
I think it's unintentional that some kvm versions apparently forget to
set the PF_INSTR bit.
--Andy
>
> -hpa
>
>
> --
> H. Peter Anvin, Intel Open Source Technology Center
> I work for Intel. I don't speak on their behalf.
>
--
Andy Lutomirski
AMA Capital Management, LLC
Office: (310) 553-5322
Mobile: (650) 906-0647
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