From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Vrabel Subject: Re: [PATCH V2] Add flag to start info regarding virtual mapped p2m list Date: Wed, 4 Mar 2015 11:18:04 +0000 Message-ID: <54F6E9EC.4020801@citrix.com> References: <1425374993-32028-1-git-send-email-jgross@suse.com> <54F59ABD02000078000658FB@suse.com> <54F58DA1.5000401@suse.com> <54F6D73802000078000660CF@mail.emea.novell.com> <1425461748.25940.88.camel@citrix.com> <54F6E19D020000780006611E@mail.emea.novell.com> <1425463572.25940.107.camel@citrix.com> <54F6DC89.8050106@suse.com> <54F6E5AD.4060205@citrix.com> <54F6E7E6.8090108@suse.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1YT7Ja-0007Zn-DP for xen-devel@lists.xenproject.org; Wed, 04 Mar 2015 11:18:10 +0000 In-Reply-To: <54F6E7E6.8090108@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 , David Vrabel , Ian Campbell , Jan Beulich Cc: andrew.cooper3@citrix.com, xen-devel@lists.xenproject.org, keir@xen.org, ian.jackson@eu.citrix.com, tim@xen.org List-Id: xen-devel@lists.xenproject.org On 04/03/15 11:09, Juergen Gross wrote: > On 03/04/2015 11:59 AM, David Vrabel wrote: >> On 04/03/15 10:20, Juergen Gross wrote: >>> >>> I could, of course, wait with the flag bit until xl is ready and post >>> another kernel patch then. Unfortunately this would delay Linux support >>> for automatically be able to run as a pv-domain >500GB further, so I >>> strongly recommend accepting the interface change now. >> >> I suggested before: >> >> "If dom0, enable >512G. >> If domU, enable >512G if requested by command line option /or/ toolstack >> indicates that it supports the linear p2m." >> >> So this flag is only required to /automatically/ enable >512GB PV >> guests. You still need the manual (command line) override so this flag >> isn't needed until the toolstack actually supports the linear p2m, and >> the kernel support for this automatic enablement can be added later as >> well. > > Correct. The question is, whether we want some kernel versions capable > of running as 1TB guest requiring an additional boot parameter to do so. > Avoiding this is easy, but if you don't like it, I can wait with this > patch. I think running such large PV domUs is a sufficiently rare use case that this is fine. David