From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 02A83C4332F for ; Mon, 6 Nov 2023 15:33:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232107AbjKFPdW (ORCPT ); Mon, 6 Nov 2023 10:33:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41726 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231277AbjKFPdU (ORCPT ); Mon, 6 Nov 2023 10:33:20 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 01ABCB8 for ; Mon, 6 Nov 2023 07:33:18 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 95FE8C433C7; Mon, 6 Nov 2023 15:33:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699284797; bh=xV7m5Axz6doc1+4iuhW6bs3XG18ZDG1RNL3LtMPk/bA=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=QSe+LhMhvFLDhezunvYjS91vcxuGdkNV3dRzxEHBsN2hfo6RPH/Pt2YTxiRrRmcAD OvgnVk5QNtmf4artyOZ1+svaV6jGvSQ6y6y/mlMVdK1eZ/b3E9RjHeYg6VOHt/QRES 4qxEJlQ9pZnV6Bymj2bqCcqmMjYc9+47Z0Q7Bm5Xbj+pa39mwdQKMiI3MCY3N//fk2 2AADPaFJc9/oKRhknESCqAhP7DjE7Jxn8eN/6n202w/G9Ioz/GqWmejgS4EMhpmbsJ bWJIxJ4lWSKBEs35tUSSjf48SDSbjVWyPJQozNEgzLGwXZFinq+fI8tQ1vHWUbliDV NbIa5ZTv5f+/A== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1r01bG-00Ao8C-Rb; Mon, 06 Nov 2023 15:33:15 +0000 Date: Mon, 06 Nov 2023 15:33:14 +0000 Message-ID: <86edh228xx.wl-maz@kernel.org> From: Marc Zyngier To: Kunkun Jiang Cc: Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Gavin Shan , Jean-Philippe Brucker , "open list:IRQCHIP DRIVERS" , , , Subject: Re: [RFC PATCH] KVM: arm/arm64: GICv4: Support shared VLPI In-Reply-To: <1fb8353e-e9c4-2570-c2ca-ec537c18ac4d@huawei.com> References: <20231102143507.840-1-jiangkunkun@huawei.com> <87msvt6cc7.wl-maz@kernel.org> <1fb8353e-e9c4-2570-c2ca-ec537c18ac4d@huawei.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/29.1 (aarch64-unknown-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: 185.219.108.64 X-SA-Exim-Rcpt-To: jiangkunkun@huawei.com, oliver.upton@linux.dev, james.morse@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, gshan@redhat.com, jean-philippe@linaro.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, wanghaibin.wang@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 06 Nov 2023 14:59:01 +0000, Kunkun Jiang wrote: > > The virtio-pci driver write entry1-6 > massage.data in the msix-table and trap to QEMU for processing. The > massage.data is as follow: > > entry-0 0 > > entry-1 1 > > entry-2 1 > > entry-3 1 > > entry-4 1 > > entry-5 1 > > entry-6 1 Urgh... is vp_modern_queue_vector() used in your configuration? This is ... terrible. I wonder if PCIe actually allows this sort of thing. In any case, this sort of behaviour breaks so many thing in KVM's implementation that I'd recommend you disable GICv4 until we have a good solution for that. M. -- Without deviation from the norm, progress is not possible.