linux-kernel - Re: [KVM paravirt issue?] Re: vsyscall=emulate regression

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Message-ID: <CALCETrVk=3D0q2FHLhfZGhv4apFsJ1jnZAUWgwjRoFxT7OqPgQ@mail.gmail.com>
Date:	Fri, 24 Feb 2012 10:58:31 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Avi Kivity <avi@...hat.com>, Amit Shah <amit.shah@...hat.com>,
	tglx@...utronix.de, mingo@...hat.com, x86@...nel.org,
	linux-kernel@...r.kernel.org, kvm list <kvm@...r.kernel.org>
Subject: Re: [KVM paravirt issue?] Re: vsyscall=emulate regression

On Thu, Feb 23, 2012 at 8:34 PM, H. Peter Anvin <hpa@...or.com> 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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