From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dario Faggioli Subject: Re: PV-vNUMA issue: topology is misinterpreted by the guest Date: Mon, 27 Jul 2015 16:09:26 +0200 Message-ID: <1438006166.5036.156.camel@citrix.com> References: <1437042762.28251.18.camel@citrix.com> <55A7A7F40200007800091D60@mail.emea.novell.com> <55A78DF2.1060709@citrix.com> <20150716152513.GU12455@zion.uk.xensource.com> <55A7D17C.5060602@citrix.com> <55A7D2CC.1050708@oracle.com> <55A7F7F40200007800092152@mail.emea.novell.com> <55A7DE45.4040804@citrix.com> <55A7E2D8.3040203@oracle.com> <55A8B83802000078000924AE@mail.emea.novell.com> <1437118075.23656.25.camel@citrix.com> <55A946C6.8000002@oracle.com> <1437401354.5036.19.camel@citrix.com> <55AD08F7.7020105@oracle.com> <55AEA4DD.7080406@oracle.com> <1437572160.5036.39.camel@citrix.com> <55AF9F8F.7030200@suse.com> <55AFA16B.3070103@oracle.com> <55AFA41E.1080101@suse.com> <55AFAC34.1060606@oracle.com> <55B070ED.2040200@suse.com> <1437660433.5036.96.camel@citrix.com> <55B21364.5040906@suse.com> <1437749076.4682.47.camel@citrix.com> <55B25650.4030402@suse.com> <55B258C9.4040400@suse.com> <1437753509.4682.78.camel@citrix.com> <55B26377.4060807@suse.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============7863972125845089853==" Return-path: Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1ZJj6H-0002B6-JT for xen-devel@lists.xenproject.org; Mon, 27 Jul 2015 14:09:53 +0000 In-Reply-To: <55B26377.4060807@suse.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Juergen Gross Cc: Elena Ufimtseva , Wei Liu , Andrew Cooper , David Vrabel , Jan Beulich , "xen-devel@lists.xenproject.org" , Boris Ostrovsky List-Id: xen-devel@lists.xenproject.org --===============7863972125845089853== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-A3kBujxB2Br53UWQ5Jzj" --=-A3kBujxB2Br53UWQ5Jzj Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2015-07-24 at 18:10 +0200, Juergen Gross wrote: > On 07/24/2015 05:58 PM, Dario Faggioli wrote: > > So, just to check if I'm understanding is correct: you'd like to add an > > abstraction layer, in Linux, like in generic (or, perhaps, scheduling) > > code, to hide the direct interaction with CPUID. > > Such layer, on baremetal, would just read CPUID while, on PV-ops, it'd > > check with Xen/match vNUMA/whatever... Is this that you are saying? >=20 > Sort of, yes. >=20 > I just wouldn't add it, as it is already existing (more or less). It > can deal right now with AMD and Intel, we would "just" have to add Xen. >=20 So, having gone through the rest of the thread (so far), and having given a fair amount o thinking to this, I really think that something like this would be a good thing to have in Linux. Of course, it's not that my opinion on where should be in Linux counts that much! :-D Nevertheless, I wanted to make it clear that, while skeptic at the beginning, I now think this is (part of) the way to go, as I said and explained in my reply to George. Regards, Dario --=20 <> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://about.me/dario.faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK) --=-A3kBujxB2Br53UWQ5Jzj Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEABECAAYFAlW2O5YACgkQk4XaBE3IOsTT6QCfZE0Jbrg5qQBcR5lKFfnFm1xN e88AnjlsoRHaBP6MRFrB6y4DBmebDFkV =QVsM -----END PGP SIGNATURE----- --=-A3kBujxB2Br53UWQ5Jzj-- --===============7863972125845089853== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel --===============7863972125845089853==--