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From: Amit Shah <amit.shah@redhat.com>
To: Avi Kivity <avi@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>,
	"H. Peter Anvin" <hpa@zytor.com>,
	tglx@linutronix.de, mingo@redhat.com, x86@kernel.org,
	linux-kernel@vger.kernel.org, kvm list <kvm@vger.kernel.org>
Subject: Re: [KVM paravirt issue?] Re: vsyscall=emulate regression
Date: Tue, 28 Feb 2012 16:38:23 +0530	[thread overview]
Message-ID: <20120228110823.GA9197@amit.redhat.com> (raw)
In-Reply-To: <4F4CA5C2.4050605@redhat.com>

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@zytor.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

      reply	other threads:[~2012-02-28 11:08 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-03  8:27 vsyscall=emulate regression Amit Shah
2012-02-03 15:30 ` Andy Lutomirski
2012-02-03 17:32   ` Amit Shah
2012-02-14 12:22 ` Amit Shah
2012-02-14 16:26   ` Andy Lutomirski
2012-02-15 11:01     ` Amit Shah
2012-02-15 19:36       ` [KVM paravirt issue?] " Andy Lutomirski
2012-02-16 16:17         ` Avi Kivity
2012-02-16 16:45           ` Andy Lutomirski
2012-02-16 17:14             ` Avi Kivity
2012-02-16 17:35               ` Andy Lutomirski
2012-02-16 17:39                 ` Avi Kivity
2012-02-24  4:34                   ` H. Peter Anvin
2012-02-24 18:58                     ` Andy Lutomirski
2012-02-28 10:00                       ` Avi Kivity
2012-02-28 11:08                         ` Amit Shah [this message]

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