Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965159Ab2B1LIi (ORCPT ); Tue, 28 Feb 2012 06:08:38 -0500 Received: from mx1.redhat.com ([209.132.183.28]:16548 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752872Ab2B1LIh (ORCPT ); Tue, 28 Feb 2012 06:08:37 -0500 Date: Tue, 28 Feb 2012 16:38:23 +0530 From: Amit Shah To: Avi Kivity Cc: Andy Lutomirski , "H. Peter Anvin" , tglx@linutronix.de, mingo@redhat.com, x86@kernel.org, linux-kernel@vger.kernel.org, kvm list Subject: Re: [KVM paravirt issue?] Re: vsyscall=emulate regression Message-ID: <20120228110823.GA9197@amit.redhat.com> References: <20120215110122.GA3136@amit.redhat.com> <4F3D2C09.1020803@redhat.com> <4F3D395B.1000708@redhat.com> <4F3D3F59.80807@redhat.com> <4F471344.1010002@zytor.com> <4F4CA5C2.4050605@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4F4CA5C2.4050605@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1048 Lines: 29 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 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/