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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iLVJ2-0006gN-RF; Fri, 18 Oct 2019 16:40:48 +0000 Received: from inca-roads.misterjones.org ([213.251.177.50]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iLVIy-0006Fg-A3; Fri, 18 Oct 2019 16:40:46 +0000 Received: from [213.166.56.99] (helo=big-swifty.misterjones.org) by cheepnis.misterjones.org with esmtpsa (TLSv1.2:AES256-GCM-SHA384:256) (Exim 4.80) (envelope-from ) id 1iLVIk-0002nV-PR; Fri, 18 Oct 2019 18:40:30 +0200 Date: Fri, 18 Oct 2019 17:40:29 +0100 Message-ID: <86h846ypky.wl-maz@kernel.org> From: Marc Zyngier To: Stephen Boyd Subject: Re: Relax CPU features sanity checking on heterogeneous architectures In-Reply-To: <5da9cd3a.1c69fb81.95e9.e5e2@mx.google.com> References: <20191011105010.GA29364@lakrids.cambridge.arm.com> <7910f428bd96834c15fb56262f3c10f8@codeaurora.org> <20191011143442.515659f4@why> <5da8c868.1c69fb81.ae709.97ff@mx.google.com> <5da9cd3a.1c69fb81.95e9.e5e2@mx.google.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 EasyPG/1.0.0 Emacs/26 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 213.166.56.99 X-SA-Exim-Rcpt-To: swboyd@chromium.org, saiprakash.ranjan@codeaurora.org, mark.rutland@arm.com, rnayak@codeaurora.org, suzuki.poulose@arm.com, catalin.marinas@arm.com, linux-arm-kernel-bounces@lists.infradead.org, linux-kernel@vger.kernel.org, jeremy.linton@arm.com, bjorn.andersson@linaro.org, linux-arm-msm@vger.kernel.org, andrew.murray@arm.com, will@kernel.org, dave.martin@arm.com, linux-arm-kernel@lists.infradead.org, marc.w.gonzalez@free.fr X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on cheepnis.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191018_094044_549930_F49C964B X-CRM114-Status: GOOD ( 11.90 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Sai Prakash Ranjan , rnayak@codeaurora.org, suzuki.poulose@arm.com, catalin.marinas@arm.com, linux-arm-kernel , marc.w.gonzalez@free.fr, linux-kernel@vger.kernel.org, jeremy.linton@arm.com, bjorn.andersson@linaro.org, linux-arm-msm@vger.kernel.org, andrew.murray@arm.com, will@kernel.org, dave.martin@arm.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 18 Oct 2019 15:33:29 +0100, Stephen Boyd wrote: > > Quoting Marc Zyngier (2019-10-18 00:20:56) > > > > If this SoC is anythinig like SM8150, 32bit guests will be hit and > > miss, > > depending on the CPU your guest runs on, or is migrated to. We need to > > either drop capabilities from the 32bit-capable CPU, or prevent the > > non-32bit capable CPU from booting if a 32bit guest has been started. > > > > You just have to hope that the kernel is entered at EL2, and that QC's > > "value add" has been moved somewhere else... > > > > Ok that's good. I need a new signature. M. -- Jazz is not dead, it just smells funny. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel