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Thu, 25 Mar 2021 09:37:15 +0000 From: Shameerali Kolothum Thodi To: Marc Zyngier CC: "kvmarm@lists.cs.columbia.edu" , "kvm@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "stable@vger.kernel.org" , "pbonzini@redhat.com" , Linuxarm Subject: RE: [PATCH for-stable-5.10 2/2] KVM: arm64: Workaround firmware wrongly advertising GICv2-on-v3 compatibility Thread-Topic: [PATCH for-stable-5.10 2/2] KVM: arm64: Workaround firmware wrongly advertising GICv2-on-v3 compatibility Thread-Index: AQHXIVdkF/Q7jN0LS02rK142tsme1qqUcRaAgAAAZbA= Date: Thu, 25 Mar 2021 09:37:15 +0000 Message-ID: <3ed860eaf93c43969b7dfeb0904efb2e@huawei.com> References: <20210325091424.26348-1-shameerali.kolothum.thodi@huawei.com> <20210325091424.26348-3-shameerali.kolothum.thodi@huawei.com> <9850fc39c1c80840ea77eba60ee5e663@kernel.org> In-Reply-To: <9850fc39c1c80840ea77eba60ee5e663@kernel.org> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.26.249] MIME-Version: 1.0 X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210325_093717_485429_BF98FAF8 X-CRM114-Status: GOOD ( 20.41 ) 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 > -----Original Message----- > From: Marc Zyngier [mailto:maz@kernel.org] > Sent: 25 March 2021 09:33 > To: Shameerali Kolothum Thodi > Cc: kvmarm@lists.cs.columbia.edu; kvm@vger.kernel.org; > linux-arm-kernel@lists.infradead.org; stable@vger.kernel.org; > pbonzini@redhat.com; Linuxarm > Subject: Re: [PATCH for-stable-5.10 2/2] KVM: arm64: Workaround firmware > wrongly advertising GICv2-on-v3 compatibility > > On 2021-03-25 09:14, Shameer Kolothum wrote: > > From: Marc Zyngier > > > > commit 9739f6ef053f104a997165701c6e15582c4307ee upstream. > > > > It looks like we have broken firmware out there that wrongly > > advertises a GICv2 compatibility interface, despite the CPUs not being > > able to deal with it. > > > > To work around this, check that the CPU initialising KVM is actually > > able to switch to MMIO instead of system registers, and use that as a > > precondition to enable GICv2 compatibility in KVM. > > > > Note that the detection happens on a single CPU. If the firmware is > > lying *and* that the CPUs are asymetric, all hope is lost anyway. > > > > Cc: stable@vger.kernel.org #5.10 > > Reported-by: Shameerali Kolothum Thodi > > > > Tested-by: Shameer Kolothum > > Signed-off-by: Marc Zyngier > > Message-Id: <20210305185254.3730990-8-maz@kernel.org> > > Signed-off-by: Paolo Bonzini > > Signed-off-by: Shameer Kolothum > > Please hold on on that. > > This patch causes a regression, and needs a fix that is currently queued for 5.12 > [1]. Once this hits upstream, please add the fix to the series and post it as a > whole. Ok. Yes, I noted that. But was thinking if this goes through first and then we can have a stable tag for that one, we can manage it. Anyway, will wait now. Thanks, Shameer > Thanks, > > M. > > [1] https://lore.kernel.org/r/20210323162301.2049595-1-maz@kernel.org > -- > 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