Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756244Ab2BXTDx (ORCPT ); Fri, 24 Feb 2012 14:03:53 -0500 Received: from mail-vw0-f46.google.com ([209.85.212.46]:60633 "EHLO mail-vw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756023Ab2BXTDs convert rfc822-to-8bit (ORCPT ); Fri, 24 Feb 2012 14:03:48 -0500 Authentication-Results: mr.google.com; spf=pass (google.com: domain of luto@amacapital.net designates 10.220.156.204 as permitted sender) smtp.mail=luto@amacapital.net MIME-Version: 1.0 In-Reply-To: <4F471344.1010002@zytor.com> References: <20120203082748.GB782@amit.redhat.com> <20120214122205.GA29418@amit.redhat.com> <20120215110122.GA3136@amit.redhat.com> <4F3D2C09.1020803@redhat.com> <4F3D395B.1000708@redhat.com> <4F3D3F59.80807@redhat.com> <4F471344.1010002@zytor.com> From: Andy Lutomirski Date: Fri, 24 Feb 2012 10:58:31 -0800 Message-ID: Subject: Re: [KVM paravirt issue?] Re: vsyscall=emulate regression To: "H. Peter Anvin" Cc: Avi Kivity , Amit Shah , tglx@linutronix.de, mingo@redhat.com, x86@kernel.org, linux-kernel@vger.kernel.org, kvm list Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 890 Lines: 37 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. --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 -- 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/