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Fri, 04 Sep 2020 11:46:58 +0100 Date: Fri, 04 Sep 2020 11:46:56 +0100 Message-ID: <87r1rh7ra7.wl-maz@kernel.org> From: Marc Zyngier To: Catalin Marinas Cc: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, Will Deacon , Dave P Martin , Vincenzo Frascino , Szabolcs Nagy , Kevin Brodsky , Andrey Konovalov , Peter Collingbourne , Andrew Morton , Steven Price Subject: Re: [PATCH v9 04/29] arm64: kvm: mte: Hide the MTE CPUID information from the guests In-Reply-To: <20200904103029.32083-5-catalin.marinas@arm.com> References: <20200904103029.32083-1-catalin.marinas@arm.com> <20200904103029.32083-5-catalin.marinas@arm.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/26.3 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: catalin.marinas@arm.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, will@kernel.org, Dave.Martin@arm.com, vincenzo.frascino@arm.com, szabolcs.nagy@arm.com, kevin.brodsky@arm.com, andreyknvl@google.com, pcc@google.com, akpm@linux-foundation.org, steven.price@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-Rspamd-Queue-Id: C5D721819E766 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, 04 Sep 2020 11:30:04 +0100, Catalin Marinas wrote: > > KVM does not support MTE in guests yet, so clear the corresponding field > in the ID_AA64PFR1_EL1 register. In addition, inject an undefined > exception in the guest if it accesses one of the GCR_EL1, RGSR_EL1, > TFSR_EL1 or TFSRE0_EL1 registers. While the emulate_sys_reg() function > already injects an undefined exception, this patch prevents the > unnecessary printk. > > Signed-off-by: Catalin Marinas > Cc: Marc Zyngier > Cc: Steven Price Acked-by: Marc Zyngier M. -- Without deviation from the norm, progress is not possible.