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Fri, 15 Jan 2021 14:15:26 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1l0Psq-0005my-KX for linux-arm-kernel@lists.infradead.org; Fri, 15 Jan 2021 14:15:25 +0000 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D4E1022473; Fri, 15 Jan 2021 14:15:22 +0000 (UTC) Received: from disco-boy.misterjones.org ([51.254.78.96] helo=www.loen.fr) by disco-boy.misterjones.org with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94) (envelope-from ) id 1l0Psm-007mPC-RH; Fri, 15 Jan 2021 14:15:20 +0000 MIME-Version: 1.0 Date: Fri, 15 Jan 2021 14:15:20 +0000 From: Marc Zyngier To: Ard Biesheuvel Subject: Re: [PATCH v2 2/2] KVM: arm64: Workaround firmware wrongly advertising GICv2-on-v3 compatibility In-Reply-To: References: <20210115140323.2682634-1-maz@kernel.org> <20210115140323.2682634-3-maz@kernel.org> User-Agent: Roundcube Webmail/1.4.9 Message-ID: <67c2f61a5dd33731cf52b6e26095ed51@kernel.org> X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: ardb@kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, shameerali.kolothum.thodi@huawei.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, kernel-team@android.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-20210115_091524_752941_3ACE4021 X-CRM114-Status: GOOD ( 11.91 ) 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: Suzuki K Poulose , Shameerali Kolothum Thodi , James Morse , Linux ARM , Android Kernel Team , kvmarm , Julien Thierry Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2021-01-15 14:08, Ard Biesheuvel wrote: > On Fri, 15 Jan 2021 at 15:03, Marc Zyngier wrote: [...] >> diff --git a/arch/arm64/kvm/vgic/vgic-v3.c >> b/arch/arm64/kvm/vgic/vgic-v3.c >> index 8e7bf3151057..67b27b47312b 100644 >> --- a/arch/arm64/kvm/vgic/vgic-v3.c >> +++ b/arch/arm64/kvm/vgic/vgic-v3.c >> @@ -584,8 +584,10 @@ early_param("kvm-arm.vgic_v4_enable", >> early_gicv4_enable); >> int vgic_v3_probe(const struct gic_kvm_info *info) >> { >> u64 ich_vtr_el2 = kvm_call_hyp_ret(__vgic_v3_get_gic_config); >> + bool has_v2; >> int ret; >> >> + has_v2 = ich_vtr_el2 >> 63; >> ich_vtr_el2 = (u32)ich_vtr_el2; >> >> /* >> @@ -605,13 +607,15 @@ int vgic_v3_probe(const struct gic_kvm_info >> *info) >> gicv4_enable ? "en" : "dis"); >> } >> >> + kvm_vgic_global_state.vcpu_base = 0; >> + >> if (!info->vcpu.start) { >> kvm_info("GICv3: no GICV resource entry\n"); >> - kvm_vgic_global_state.vcpu_base = 0; >> + } else if (!has_v2) { >> + pr_warn("CPU interface incapable of MMIO access\n"); > > Could we include FW_BUG here to stress that this is a firmware problem? Absolutely! That's what it now looks like: [ 2.648452] kvm [1]: IPA Size Limit: 40 bits [ 2.649259] [Firmware Bug]: CPU interface incapable of MMIO access [ 2.649620] kvm [1]: disabling GICv2 emulation [ 2.650227] kvm [1]: GIC system register CPU interface enabled [ 2.652004] kvm [1]: vgic interrupt IRQ9 [ 2.655623] kvm [1]: VHE mode initialized successfully Updated version pushed out. 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