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 38ACEC6FD1F for ; Sat, 11 Mar 2023 10:41:44 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pawf2-0005Zh-Ox; Sat, 11 Mar 2023 05:41:12 -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 1pawf0-0005ZE-8i for qemu-devel@nongnu.org; Sat, 11 Mar 2023 05:41:10 -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 1pawex-0007VF-UN for qemu-devel@nongnu.org; Sat, 11 Mar 2023 05:41:09 -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=zChtNeVab/YJkaVPb3K1Cc8IA/8RQ24+TGy7+Edv56M=; b=aEQvBKAcCWALT+CmuqV2uRIRwv ikY/LaF1sdZ8zkGm9EbyEhQQT+sjfoE2Y84mckoCJZDEB+6Op/Gok4HEi7jPcnXpSjZEJCnihEdNh T+9uAs5Afe1jV7T279X0xZ2Ssp6iuMELeArAdhFFi1G4yB0MiMTpM2fhFe1x4nKTMLRNjMGtBCiu1 qdrggo+sn5MzlVi305VJOrPhx3GwOak5Apt/uJOS+mTUpcCXyBLSTkyuA8Q920ZOWxIjYuPwmQx7+ BZy7vxUBuwtc8zDWBxN8xXQZOGGgfVW8vGxoMAXhWh05JgH9EMzwEwD7Z+1lklF2oMLONdqZksGoy jxkLc2LA==; Received: from [2001:8b0:10b:5:b24a:df8e:af83:d500] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pawep-00A7yR-2u; Sat, 11 Mar 2023 10:40:59 +0000 Message-ID: <612c04cb7eea15a084904c836fe0c5eb021aee28.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: Sat, 11 Mar 2023 10:40:58 +0000 In-Reply-To: References: <6E7EA2EE-382C-4345-9A2A-D61E0139FB65@infradead.org> <34f494519d1921e8b62a6f3e709511a9467df54d.camel@infradead.org> <55bab93ee00619ac5b5b7416c17aee175ada8a8b.camel@infradead.org> <0754a758a46549dccde7878282721fe3835dc4b3.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-WK/l5HAzl2lybbziSJZn" 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+40ca9e1212043cdc4539+7139+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 --=-WK/l5HAzl2lybbziSJZn Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2023-03-10 at 15:13 -0500, Peter Xu wrote: >=20 > >=20 > > It'll *broadly* look like the existing kvm_irqchip_* functions but be a > > lot simpler to use. >=20 > IIUC what's missing is the reverse chain of notifications from e.g. IRTE = to > the device, either via MSIs or via some pins of IOAPIC. For the translation we don't need a reverse path. When a range of 'cookies' is invalidated, the generic irqroute code just kicks the irqfd out of the routing table. That means the device code gets notified by its *own* eventfd. It tries to say "deliver virq", gets a "nope, it's invalid", and then reprovides the original MSI information to be (re)translated (and to raise a fault if it's invalid now). Looks a bit like this... if (timer.gsi =3D=3D static_cast(-1)) return -1; if (irqchip_try_deliver_gsi(timer.gsi) >=3D 0) return 0; struct kvm_msi msi =3D read_timer_msi_reg(timer); if (irqchip_update_msi(timer.gsi, &msi, deliver_now =3D true) < 0) errno =3D 0; Now, for the interrupt *acknowledge* (kvm_resample_fd_notify) we absolutely need a reverse path, and we need that anyway regardless of KVM routing =E2=80=94 VFIO and the Xen event channel GSI can both be massiv= ely cleaned up if we have that wired up from the EOI/intack. But that's *mostly* a separate issue, except that of course we want to wire that resamplefd up in the routing table *too* and make things consistent in userspace vs. KVM. > I don't think I have very good knowledge on the whole IRQ path yet so I > can't really tell anything useful, but what you said looks like a good > thing to have.=C2=A0 If it can cleanup things besides achieving the goal = of > fault irq reporting it could be more worthwhile. Yeah, that's definitely the intent. When I first started playing with this in order to implement interrupt remapping in my other VMM, I carefully drew out state diagrams in pencil, tracking which eventfd was connected to userspace/KVM in different states across first-trigger/masking/unmasking/live-update, with a large 'WTF!!!' on the one of the state transitions from masked to unmasked, when the IRQ happened anyway. For QEMU I haven't even been able to write it out, because the logic is split across different devices and handled differently in each. I think it can be really simple. --=-WK/l5HAzl2lybbziSJZn Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf ItMltrMaXqcESJuK8dtK56NCSrq4iDKaKq9NxOXFmqXX2zN8HHGjQ2b2Xv0v1L5Nk1MQPKA19xeW 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