From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42910) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aGRid-0000pl-TM for qemu-devel@nongnu.org; Tue, 05 Jan 2016 08:32:12 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aGRiZ-0001YE-Sc for qemu-devel@nongnu.org; Tue, 05 Jan 2016 08:32:11 -0500 Received: from mx1.redhat.com ([209.132.183.28]:60422) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aGRiZ-0001Xz-NX for qemu-devel@nongnu.org; Tue, 05 Jan 2016 08:32:07 -0500 Message-ID: <1452000725.6030.7.camel@redhat.com> From: Gerd Hoffmann Date: Tue, 05 Jan 2016 14:32:05 +0100 In-Reply-To: <20160105151711-mutt-send-email-mst@redhat.com> References: <1451995191-20572-1-git-send-email-kraxel@redhat.com> <20160105151711-mutt-send-email-mst@redhat.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 Subject: Re: [Qemu-devel] [PATCH] pc: allow raising low memory via max-ram-below-4g option List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Michael S. Tsirkin" Cc: Paolo Bonzini , qemu-devel@nongnu.org, Eduardo Habkost , Richard Henderson On Di, 2016-01-05 at 15:17 +0200, Michael S. Tsirkin wrote: > On Tue, Jan 05, 2016 at 12:59:51PM +0100, Gerd Hoffmann wrote: > > This patch extends the functionality of the max-ram-below-4g option > > to also allow increasing lowmem. While being at it also rework the > > lowmem calculation logic and add a longish comment describing how it > > works and what the compatibility constrains are. > >=20 > > Signed-off-by: Gerd Hoffmann >=20 > Could you please add info about the motivation for this > in the commit log? > > + * - Finally max-ram-below-4g got updated to also allow raising l= owmem, > > + * so legacy non-PAE guests can get as much memory as possible = in > > + * the 32bit address space below 4G. It's right here (where it imho is more useful for people looking at the code). Want me copy this into the commit message? cheers, Gerd