From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jan Beulich" Subject: Re: [PATCH RFC v2 1/4] x86/mm: Shadow and p2m changes for PV mem_access Date: Wed, 27 Aug 2014 07:33:51 +0100 Message-ID: <53FD97EF020000780002DEF2@mail.emea.novell.com> References: <1404787805-4540-1-git-send-email-aravindp@cisco.com> <97A500D504438F4ABC02EBA81613CC633188BE3A@xmb-aln-x02.cisco.com> <53D60EA002000078000265FC@mail.emea.novell.com> <97A500D504438F4ABC02EBA81613CC633188EC46@xmb-aln-x02.cisco.com> <53D8B6AC0200007800027844@mail.emea.novell.com> <97A500D504438F4ABC02EBA81613CC633188EF44@xmb-aln-x02.cisco.com> <53DB52380200007800028448@mail.emea.novell.com> <97A500D504438F4ABC02EBA81613CC633188FBD7@xmb-aln-x02.cisco.com> <53DF4C6B0200007800028CA5@mail.emea.novell.com> <97A500D504438F4ABC02EBA81613CC63318A2DBD@xmb-rcd-x02.cisco.com> <53E096C902000078000294A2@mail.emea.novell.com> <97A500D504438F4ABC02EBA81613CC63318E00F6@xmb-aln-x02.cisco.com> <53F77EEC020000780002CC3E@mail.emea.novell.com> <97A500D504438F4ABC02EBA81613CC63318E04E7@xmb-aln-x02.cisco.com> <53F798D9.9090800@citrix.com> <97A500D504438F4ABC02EBA81613CC63318E057E@xmb-aln-x02.cisco.com> <53F7A1C3.3060007@citrix.com> <53FB02E8020000780002D09B@mail.emea.novell.com> <53FB30D0.1010906@citrix.com> <53FB5196020000780002D3F7@mail.emea.novell.com> <97A500D504438F4ABC02EBA81613CC63318E103D@xmb-aln-x02.cisco.com> <53FC4E81020000780002D73E@mail.emea.novell.com> <97A500D504438F4ABC02EBA81613CC63318E3BB9@xmb-aln-x02.cisco.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta4.messagelabs.com ([85.158.143.247]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1XMWnq-0001tI-56 for xen-devel@lists.xenproject.org; Wed, 27 Aug 2014 06:33:54 +0000 In-Reply-To: <97A500D504438F4ABC02EBA81613CC63318E3BB9@xmb-aln-x02.cisco.com> Content-Disposition: inline List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: "Aravindh Puthiyaparambil (aravindp)" Cc: KeirFraser , Ian Campbell , Andrew Cooper , Tim Deegan , "xen-devel@lists.xenproject.org" , Ian Jackson List-Id: xen-devel@lists.xenproject.org >>> On 27.08.14 at 00:27, wrote: >>> 2. The "CR0.WP with interrupts disabled" solution is not viable because of >>> NMIs. Or did I misunderstand? >> >>For this second option, NMIs are a concern. Whether that makes it >>not viable I'm not certain. We really need to weigh benefits and risks >>here, and from a project wide perspective I'm currently viewing the > > From what I can tell, Andrew does think that this route is a viable option > and I will defer to you and him about this. If there is agreement that this > approach is acceptable, I will send out another version of the patches > implementing it. Yes, I think you should go ahead with this, understanding that there's no promise (just reasonable likelihood) to take it in the end. It's kind of unfortunate that Tim currently has very little time to spend on voicing his opinion here. Jan