From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gerd Hoffmann Subject: Re: [RFC for 2.8 0/3] Drop support for 64 bit guests on 32 bit hosts Date: Wed, 10 Aug 2016 11:25:05 +0200 Message-ID: <1470821105.22974.9.camel@redhat.com> References: <1470758127-17769-1-git-send-email-alex.bennee@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <1470758127-17769-1-git-send-email-alex.bennee@linaro.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+gceq-qemu-devel=gmane.org@nongnu.org Sender: "Qemu-devel" To: Alex =?ISO-8859-1?Q?Benn=E9e?= Cc: peter.maydell@linaro.org, xen-devel , qemu-devel@nongnu.org, rth@twiddle.net List-Id: xen-devel@lists.xenproject.org On Di, 2016-08-09 at 16:55 +0100, Alex Benn=C3=A9e wrote: > Hi, >=20 > I'm proposing for the 2.8 cycle we officially drop supporting 64 bit > guests on 32 bit hosts. For most of the KVM targets it doesn't make > any sense anyway and for TCG it makes things harder (e.g. supporting > 64 bit atomics on a 32 bit platform). I'm not actually convinced > things actually work if built or that anyone relies on these > combinations. Consider these patches a way of flushing any such users > out ;-) Adding xen-devel to Cc. 64bit xen hypervisor with 32bit dom0 running 32bit qemu, providing device emulation for 64bit dumUs at least used to be a common setup years ago. I have my doubts this is still the case in recent xen versions, but I guess we better ask the Xen guys ... Can anyone clarify? thanks, Gerd