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Thu, 16 Jan 2020 07:28:49 +0000 MIME-Version: 1.0 Date: Thu, 16 Jan 2020 07:28:49 +0000 From: Marc Zyngier To: Will Deacon Subject: Re: [PATCH v5 0/3] arm64: Workaround for Cortex-A55 erratum 1530923 In-Reply-To: <20200114164543.GD2579@willie-the-truck> References: <20191216115631.17804-1-steven.price@arm.com> <20200114164543.GD2579@willie-the-truck> Message-ID: <3292551ef07b2c5354d48faedad849ff@kernel.org> X-Sender: maz@kernel.org User-Agent: Roundcube Webmail/1.3.8 X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: will@kernel.org, steven.price@arm.com, catalin.marinas@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200115_232852_418513_5C7356DB X-CRM114-Status: GOOD ( 11.21 ) 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: Catalin Marinas , kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Steven Price Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2020-01-14 16:45, Will Deacon wrote: > On Mon, Dec 16, 2019 at 11:56:28AM +0000, Steven Price wrote: >> Version 5 is a rebasing of version 4 (no changes). >> >> This series enables a workaround for Cortex-A55 erratum 1530923. The >> erratum potentially allows TLB entries to be allocated as a result of >> a >> speculative AT instruction. This may happen in the middle of a guest >> world switch while the relevant VMSA configuration is in an >> inconsistent >> state, leading to erroneous content being allocated into TLBs. >> >> There are existing workarounds for similar issues, 1165522 is >> effectively the same, and 1319367/1319537 is similar but without VHE >> support. Rather than add to the selection of errata, the first patch >> renames 1165522 to WORKAROUND_SPECULATIVE_AT which can be reused (in >> the >> final patch) for 1530923. >> >> The workaround for errata 1319367 and 1319537 although similar cannot >> use VHE (not available on those CPUs) so cannot share the workaround. >> However, to keep some sense of symmetry the workaround is renamed to >> SPECULATIVE_AT_NVHE. >> >> Changes since v4: >> * Rebased to v5.5-rc1 > > Looks fine to me. Marc, are you ok with me queueing this via arm64 > (that's > where the existing workarounds came from), or would you prefer to take > them > via kvm-arm? Please go ahead and take it (with my ack) via the arm64 tree. Thanks, 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