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Thu, 20 Feb 2020 11:01:48 +0000 MIME-Version: 1.0 Date: Thu, 20 Feb 2020 11:01:48 +0000 From: Marc Zyngier To: Stefan Agner Subject: Re: [RFC PATCH 0/5] Removing support for 32bit KVM/arm host In-Reply-To: <69845f739bbd91e73cd82e7c4683ab5a@agner.ch> References: <20200210141324.21090-1-maz@kernel.org> <69845f739bbd91e73cd82e7c4683ab5a@agner.ch> Message-ID: X-Sender: maz@kernel.org User-Agent: Roundcube Webmail/1.3.10 X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: stefan@agner.ch, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, vladimir.murzin@arm.com, linux@arm.linux.org.uk, arnd@arndb.de, suzuki.poulose@arm.com, qperret@google.com, Christoffer.Dall@arm.com, james.morse@arm.com, pbonzini@redhat.com, will@kernel.org, julien.thierry.kdev@gmail.com 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-20200220_030151_230608_BA8819B2 X-CRM114-Status: GOOD ( 13.09 ) 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: Vladimir Murzin , Russell King , kvm@vger.kernel.org, Arnd Bergmann , Suzuki K Poulose , Quentin Perret , Christoffer Dall , James Morse , Julien Thierry , Paolo Bonzini , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org 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 2020-02-19 13:53, Stefan Agner wrote: > On 2020-02-10 15:13, Marc Zyngier wrote: >> KVM/arm was merged just over 7 years ago, and has lived a very quiet >> life so far. It mostly works if you're prepared to deal with its >> limitations, it has been a good prototype for the arm64 version, >> but it suffers a few problems: >> >> - It is incomplete (no debug support, no PMU) >> - It hasn't followed any of the architectural evolutions >> - It has zero users (I don't count myself here) >> - It is more and more getting in the way of new arm64 developments >> >> So here it is: unless someone screams and shows that they rely on >> KVM/arm to be maintained upsteam, I'll remove 32bit host support >> form the tree. One of the reasons that makes me confident nobody is >> using it is that I never receive *any* bug report. Yes, it is perfect. > > Not entirely true: > https://lore.kernel.org/m/e2f7196ca6c70c55463a45b490f6731a@agner.ch And I thank you for that. This bug was actually hitting both arm and arm64, and triggered by a bogus DT (that KVM should have handled in a nicer way). What I was trying to say is that nobody reports bugs that are specific to 32bit KVM/arm. > But, after that was fixed, it actually was perfect :-D > https://blog.printk.io/2016/09/kvm-with-kvmtool-on-armv7/ Hey, neat! not sure how useful, but neat nonetheless... ;-) > That said, I never used it in a real-world application, so from my side > removing it is fine. 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