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[2001:4830:134:3::11]) by mx.google.com with ESMTPS id t17-v6si3797968qth.259.2018.05.24.09.58.45 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 24 May 2018 09:58:45 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) client-ip=2001:4830:134:3::11; Authentication-Results: mx.google.com; spf=pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) smtp.mailfrom=qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from localhost ([::1]:39847 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fLtZd-0002Io-AE for alex.bennee@linaro.org; Thu, 24 May 2018 12:58:45 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45064) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fLtZT-0002IW-QA for qemu-arm@nongnu.org; Thu, 24 May 2018 12:58:36 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fLtZQ-000588-Nn for qemu-arm@nongnu.org; Thu, 24 May 2018 12:58:35 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:55696 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fLtZQ-00057n-JR; Thu, 24 May 2018 12:58:32 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E259A4022407; Thu, 24 May 2018 16:58:30 +0000 (UTC) Received: from lacos-laptop-7.usersys.redhat.com (ovpn-121-84.rdu2.redhat.com [10.10.121.84]) by smtp.corp.redhat.com (Postfix) with ESMTP id 54DBD11166E3; Thu, 24 May 2018 16:58:23 +0000 (UTC) To: Auger Eric , Peter Maydell References: <1527091418-11874-1-git-send-email-eric.auger@redhat.com> <22c4e504-a7b4-e6dd-b2cc-618d306b6f0c@redhat.com> <550464ac-5155-6311-d0f7-92c7c0813f82@redhat.com> From: Laszlo Ersek Message-ID: <694034a3-9d4c-3e7e-759d-6fd8f8cfd9c8@redhat.com> Date: Thu, 24 May 2018 18:58:22 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Thu, 24 May 2018 16:58:30 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Thu, 24 May 2018 16:58:30 +0000 (UTC) for IP:'10.11.54.3' DOMAIN:'int-mx03.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'lersek@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: Re: [Qemu-arm] [Qemu-devel] [RFC 0/2] ARM virt: Support up to 256 PCIe buses X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Andrew Jones , Ard Biesheuvel , QEMU Developers , qemu-arm , Shannon Zhao , Eric Auger Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: "Qemu-arm" X-TUID: pZrovgbpCMQA On 05/24/18 16:09, Auger Eric wrote: > Hi Laszlo, > > On 05/24/2018 03:59 PM, Laszlo Ersek wrote: >> On 05/24/18 15:07, Peter Maydell wrote: >>> On 24 May 2018 at 13:59, Laszlo Ersek wrote: >>>> On 05/24/18 11:11, Peter Maydell wrote: >>>>> Won't it also break a guest which is just Linux loaded not via >>>>> firmware which is an aarch32 kernel without LPAE support? >>>> >>>> Does such a thing exist? (I honestly have no clue.) >>> >>> Yes, it does; LPAE isn't a mandatory kernel config option. >>> This is why we have the machine 'highmem' option, so that >>> we can run on those kernels by not putting anything above >>> the 4G boundary. Looking back at the history on that, we >>> opted at the time for "default to highmem on, and if you're >>> running an non-lpae kernel you need to turn it off manually". >> >> Ah, OK, I didn't know that. >> >>> So we can handle those kernels by just not putting ECAM >>> above 4G if highmem is false. >> >> The problem is we can have a combination of 32-bit UEFI firmware (which >> certainly lacks LPAE) and a 32-bit kernel which supports LPAE. > > Is it what happens with the FW you provided to me? There is no LPAE in it? That's the case, to my knowledge. Thanks Laszlo