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Mon, 30 Sep 2024 15:04:31 +0100 Date: Mon, 30 Sep 2024 15:04:26 +0100 Message-ID: <87sethutjp.wl-maz@kernel.org> From: Marc Zyngier To: Ganapatrao Kulkarni Cc: Kunkun Jiang , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, wanghaibin.wang@huawei.com, tangnianyao@huawei.com, wangzhou1@hisilicon.com Subject: Re: [bug report] KVM: arm64: vgic-v4: Occasionally issue VMOVP to an unmapped VPE on GICv4.1 In-Reply-To: References: 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/29.4 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 12.191.124.166 X-SA-Exim-Rcpt-To: gankulkarni@os.amperecomputing.com, jiangkunkun@huawei.com, oliver.upton@linux.dev, james.morse@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, wanghaibin.wang@huawei.com, tangnianyao@huawei.com, wangzhou1@hisilicon.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-20240930_150439_097881_1CE47259 X-CRM114-Status: GOOD ( 14.56 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 30 Sep 2024 06:18:29 +0100, Ganapatrao Kulkarni wrote: > > > Hi Kunkun, > > On 29-09-2024 12:48 pm, Kunkun Jiang wrote: > > Hi all, > > > > I found a problem with occasionally issuing VMOVP to an unmapped VPE > > on GICv4.1. In my test environment, operating an unmapped VPE will > > generate RAS, so I found this problem. The detailed analysis is as > > follows. > > > > May I know, what specific RAS errors you are getting? That'd be IMPDEF, as the GIC architecture doesn't specify how these errors are reported (see 5.5 "ITS command error encodings" in the GICv3 spec). M. -- Without deviation from the norm, progress is not possible.