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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i1CZN-0003vy-Jq; Fri, 23 Aug 2019 16:37:45 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i1CZF-0003nX-DQ for linux-arm-kernel@lists.infradead.org; Fri, 23 Aug 2019 16:37:39 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8157A1570; Fri, 23 Aug 2019 09:37:31 -0700 (PDT) Received: from [10.1.197.61] (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id B48933F246; Fri, 23 Aug 2019 09:37:30 -0700 (PDT) Subject: Re: [PATCH v3] KVM: arm: VGIC: properly initialise private IRQ affinity To: Julien Grall , Andre Przywara , Christoffer Dall References: <20190823103416.110976-1-andre.przywara@arm.com> From: Marc Zyngier Openpgp: preference=signencrypt Autocrypt: addr=marc.zyngier@arm.com; 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Linux aarch64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190823_093737_610531_12DB6927 X-CRM114-Status: GOOD ( 14.25 ) 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: Dave Martin , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 23/08/2019 14:54, Julien Grall wrote: > Hi Andre, > > On 23/08/2019 11:34, Andre Przywara wrote: >> At the moment we initialise the target *mask* of a virtual IRQ to the >> VCPU it belongs to, even though this mask is only defined for GICv2 and >> quickly runs out of bits for many GICv3 guests. >> This behaviour triggers an UBSAN complaint for more than 32 VCPUs: >> ------ >> [ 5659.462377] UBSAN: Undefined behaviour in virt/kvm/arm/vgic/vgic-init.c:223:21 >> [ 5659.471689] shift exponent 32 is too large for 32-bit type 'unsigned int' >> ------ >> Also for GICv3 guests the reporting of TARGET in the "vgic-state" debugfs >> dump is wrong, due to this very same problem. >> >> Because there is no requirement to create the VGIC device before the >> VCPUs (and QEMU actually does it the other way round), we can't safely >> initialise mpidr or targets in kvm_vgic_vcpu_init(). But since we touch >> every private IRQ for each VCPU anyway later (in vgic_init()), we can >> just move the initialisation of those fields into there, where we >> definitely know the VGIC type. >> >> On the way make sure we really have either a VGICv2 or a VGICv3 device, >> since the existing code is just checking for "VGICv3 or not", silently >> ignoring the uninitialised case. >> >> Signed-off-by: Andre Przywara >> Reported-by: Dave Martin > > I have tested with both a combination of GICv2/GICv3 and kvmtools/QEMU. I can > confirm the UBSAN warning is not present anymore. Feel free to add my tested-by: > > Tested-by: Julien Grall Applied, and pull request sent. 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