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Fri, 18 Oct 2019 07:33:30 -0700 (PDT) Message-ID: <5da9cd3a.1c69fb81.95e9.e5e2@mx.google.com> MIME-Version: 1.0 In-Reply-To: References: <20191011105010.GA29364@lakrids.cambridge.arm.com> <7910f428bd96834c15fb56262f3c10f8@codeaurora.org> <20191011143442.515659f4@why> <5da8c868.1c69fb81.ae709.97ff@mx.google.com> From: Stephen Boyd To: Marc Zyngier Subject: Re: Relax CPU features sanity checking on heterogeneous architectures User-Agent: alot/0.8.1 Date: Fri, 18 Oct 2019 07:33:29 -0700 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191018_073332_150852_42092E06 X-CRM114-Status: UNSURE ( 8.51 ) X-CRM114-Notice: Please train this message. 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 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. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel