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

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Message-ID: <20120228110823.GA9197@amit.redhat.com>
Date:	Tue, 28 Feb 2012 16:38:23 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	"H. Peter Anvin" <hpa@...or.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 (Tue) 28 Feb 2012 [12:00:34], Avi Kivity wrote:
> On 02/24/2012 08:58 PM, Andy Lutomirski wrote:
> > 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.
> >
> 
> Correct.  Can you provide the version that failed, so we can fix it?

I'm running this on a RHEL host, the version that fails is
2.6.32-220.4.1.el6.x86_64, but can't say when it got introduced,
haven't gone back and checked that.

		Amit
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