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Sun, 12 Mar 2023 15:04:39 +0000 Date: Sun, 12 Mar 2023 15:04:39 +0000 Message-ID: <87wn3m3ta0.wl-maz@kernel.org> From: Marc Zyngier To: Reiji Watanabe Cc: Oliver Upton , kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, James Morse , Alexandru Elisei , Zenghui Yu , Suzuki K Poulose , Paolo Bonzini , Ricardo Koller , Jing Zhang , Raghavendra Rao Anata , Will Deacon Subject: Re: [PATCH 0/2] KVM: arm64: PMU: Preserve vPMC registers properly on migration In-Reply-To: <20230302055033.3081456-1-reijiw@google.com> References: <20230302055033.3081456-1-reijiw@google.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: reijiw@google.com, oliver.upton@linux.dev, kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, james.morse@arm.com, alexandru.elisei@arm.com, yuzenghui@huawei.com, suzuki.poulose@arm.com, pbonzini@redhat.com, ricarkol@google.com, jingzhangos@google.com, rananta@google.com, will@kernel.org 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-20230312_080446_082367_39A9A8B8 X-CRM114-Status: GOOD ( 16.90 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 02 Mar 2023 05:50:31 +0000, Reiji Watanabe wrote: > > The series fixes two problems in preserving vPMU counter (vPMC) > registers (PMCCNTR_EL0/PMEVCNTR_EL0) during migration. > > One of the problems is that KVM may not return the current values > of the vPMC registers for KVM_GET_ONE_REG. > > The other one might cause KVM to reset the vPMC registers on the > first KVM_RUN on the destination. This is because userspace might > save PMCR_EL0 with PMCR_EL0.{C,P} bits set on the source, and > restore it on the destination. This looks good to me. Can you please add the relevant Fixes: tags and a Cc: to stable? With that, that'd be a candidate for -rc3, I think. Thanks, M. -- Without deviation from the norm, progress is not possible. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel