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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 486DDC678D4 for ; Mon, 6 Mar 2023 09:26:28 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pZ76T-0000r6-Ap; Mon, 06 Mar 2023 04:25:58 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pZ76Q-0000pF-I7 for qemu-devel@nongnu.org; Mon, 06 Mar 2023 04:25:55 -0500 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pZ76K-0007l4-AV for qemu-devel@nongnu.org; Mon, 06 Mar 2023 04:25:50 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=9mq6XMWTinJyRUFaSTQH+EAInNGeLd9mtT7ZXMysa3o=; b=ryh/Fohk60hr6Ac8yZn48gvDXS mv49xI/USVWMnJUidmK0mgwwXzt/vr9K6+tw8FwwfiUuquZFyd5NB3vbLrbn2aq5qXrVJv1jpjpPv nWAj31U+Bes6UAShcdrTBp65bIN/yGsQrk1CpnumutWXYVU5KHXjyoS4Cdelahc8LiPWGXG0u9/5v uSyeUnoAz67flLxOXV8TZPQ+A8FATboOaE1DAansJgk15Wf2vspT/ZUFwA8J5EqA52tzewD4uIE2j +qoKhRrO3RZBiooNgZ7mtB4n/gXGnrj4umd5Zv3vLV94fPHaiyNWksTXs2kq2ae9fgFkbKTUeuQ0B YmBp1s6g==; Received: from [2001:8b0:10b:5:4950:406a:71e1:41ec] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pZ767-005Dlo-NI; Mon, 06 Mar 2023 09:25:36 +0000 Message-ID: <34f494519d1921e8b62a6f3e709511a9467df54d.camel@infradead.org> Subject: Re: [PATCH] hw/intc/ioapic: Update KVM routes before redelivering IRQ, on RTE update From: David Woodhouse To: Peter Xu Cc: "Michael S. Tsirkin" , Paolo Bonzini , qemu-devel Date: Mon, 06 Mar 2023 09:25:35 +0000 In-Reply-To: <6E7EA2EE-382C-4345-9A2A-D61E0139FB65@infradead.org> References: <6E7EA2EE-382C-4345-9A2A-D61E0139FB65@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-r1nom6VhSEp6/jK4rHJQ" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+ff41e94de7101eaa820e+7134+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-r1nom6VhSEp6/jK4rHJQ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2023-03-06 at 06:51 +0000, David Woodhouse wrote: > On 5 March 2023 22:36:18 GMT, Peter Xu wrote: > > On Sun, Mar 05, 2023 at 06:43:42PM +0000,=20 > > > --- > > > Alternative fixes might have been just to remove the part in > > > ioapic_service() which delivers the IRQ via kvm_set_irq() because > > > surely delivering as MSI ought to work just fine anyway in all cases? > > > That code lacks a comment justifying its existence. > >=20 > > Didn't check all details, but AFAIU there're still some different paths > > triggered so at least it looks still clean to use the path it's for. > >=20 > > E.g., I think if someone traces kvm_set_irq() in kernel this specific i= rq > > triggered right after unmasking might seem to be missed misterously (bu= t > > actually it was not). >=20 > Hm, not sure that's a reason we care about. The I/OAPIC is purely a > device to turn line interrupts into MSIs. Which these days need to be > translated by IOMMU interrupt remapping device models in userspace. I > don't think a user has any valid reason to expect that the kernel > will even know about any GSIs with any specific numbers. Tracing on > that in the kernel would making some dodgy assumptions. I think if we want to fix the lack of IR translation faults from the IOMMU, we have to change this anyway. At the very least, it can only use KVM to deliver the IRQ if there *is* a valid translation. 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