From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36225) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e6YqT-0004zz-Ni for qemu-devel@nongnu.org; Mon, 23 Oct 2017 05:16:30 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e6YqP-0004QU-OT for qemu-devel@nongnu.org; Mon, 23 Oct 2017 05:16:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:50700) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1e6YqP-0004QJ-IO for qemu-devel@nongnu.org; Mon, 23 Oct 2017 05:16:25 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7DB1A37E75 for ; Mon, 23 Oct 2017 09:16:24 +0000 (UTC) Message-ID: <1508750176.16488.6.camel@redhat.com> From: Gerd Hoffmann Date: Mon, 23 Oct 2017 11:16:16 +0200 In-Reply-To: <083108b4-6300-6302-d8c8-108fc6ae07fb@redhat.com> References: <20171018095807.101406-1-marcel@redhat.com> <69cefa98-5681-5b12-719c-e13fcba969c4@redhat.com> <9d4b1fa8-e670-556b-278d-4993ad41b512@redhat.com> <1508418225.18146.1.camel@redhat.com> <1508482525.18146.6.camel@redhat.com> <1508737557.16488.1.camel@redhat.com> <083108b4-6300-6302-d8c8-108fc6ae07fb@redhat.com> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Subject: Re: [Qemu-devel] [PATCH] hw/pci-host: Fix x86 Host Bridges 64bit PCI hole List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Marcel Apfelbaum , Laszlo Ersek , qemu-devel@nongnu.org Cc: mst@redhat.com, pbonzini@redhat.com, ehabkost@redhat.com, Igor Mammedov , "Dr. David Alan Gilbert" On Mon, 2017-10-23 at 11:46 +0300, Marcel Apfelbaum wrote: > On 23/10/2017 8:45, Gerd Hoffmann wrote: > > =C2=A0=C2=A0=C2=A0Hi, > >=20 > > > The guest will still run with 40 bits physical! > > > (judging the code anyway, I hope I am wrong) > > >=20 > > > Then, the stakes are not so big, the Guest kernel will disregard > > > the 64bit hole since is not CPU addressable and go on. > >=20 > > But then there is no working 64bit hole for hotplug ... > >=20 >=20 > Hosts with old CPUs are not fit for modern PCIe devices > having large BARs anyway, no 64bit hole in this case would > be OK, I think. Well, my workstation which has only 39 bits physical is kaby lake. If you classify this as "old cpu", what is a new cpu then? cheers, Gerd