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 63361C5479D for ; Wed, 11 Jan 2023 16:59:53 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pFeRI-0004N9-Nh; Wed, 11 Jan 2023 11:59:01 -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 1pFeRG-0004Mg-4S for qemu-devel@nongnu.org; Wed, 11 Jan 2023 11:58:58 -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 1pFeRD-0003eS-9S for qemu-devel@nongnu.org; Wed, 11 Jan 2023 11:58:57 -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=JLwTUUPtHJy5ZdlB/jIq2GgFJt2Xz7ovKKzKATkuJY0=; b=hEraENBUR5P/BRcwMnvrqo6Bm6 CYKbtMf7bJ3hRlH+8dN6XB1eVGWQ9F47ZZ5nGwL43jmNhN0fCDyDa7i6rR/55j4MUo5XuHyXHTBEx GAK0JB97EWwG0bUvBmdBevLxTdw03HMvyTG3P0mKvgTjDF52QA1XmS6woXl/2ei8k9EFbJgoD0y5M eiMsdacNaKmr+/GbFyBszWkg1HoaNDilixI6f/g9n06aQit/lXToPPORqF/qoj/4yqVSs2Lv9plwb +dNwsN5+mxeo8pkqaCD70vCpefUXmAwoGGwe/l8qEAgHeO98s8ylW+ybnaBXE2YIvlFPNKJhkPCLk qlszjssw==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pFeRA-004JMg-V0; Wed, 11 Jan 2023 16:58:53 +0000 Message-ID: <70eb35a08a7c48993812b7f088fa9ae3f2c8b925.camel@infradead.org> Subject: Re: [RFC] Notify IRQ sources of level interrupt ack/EOI From: David Woodhouse To: "Michael S. Tsirkin" Cc: qemu-devel@nongnu.org, Marcel Apfelbaum , Paolo Bonzini , Richard Henderson , Eduardo Habkost , Marcelo Tosatti , Alex Williamson , paul@xen.org Date: Wed, 11 Jan 2023 16:58:37 +0000 In-Reply-To: <20230111112425-mutt-send-email-mst@kernel.org> References: <23caafffdd9546b8eeff851660015f3bfc021ed3.camel@infradead.org> <20230111112425-mutt-send-email-mst@kernel.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-cGV77bQ1tOYVa654+URr" 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+193d99197280eaff698e+7080+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 --=-cGV77bQ1tOYVa654+URr Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2023-01-11 at 11:25 -0500, Michael S. Tsirkin wrote: > On Wed, Jan 11, 2023 at 02:41:58PM +0000, David Woodhouse wrote: > > This allows drivers to register a callback on a qemu_irq, which is > > invoked when a level-triggered IRQ is acked on the irqchip. > >=20 > > This allows us to simulate level-triggered interrupts more efficiently, > > by resampling the state of the interrupt only when it actually matters. >=20 > I think we tried this with vfio and had to give up on this. > I don't remember the details though. Alex probably does? Hm, not sure why there would be any insurmountable problems. I've seen this working at scale in a different VMM with split-irqchip and PCI INTX + Xen event channel support. And it's what the kernel does internally, and exposes through its dual- eventfd APIs in both KVM IRQ routing and VFIO interrupts. That said, I don't care *that* much. I can live with the way I've done it for the Xen support, by polling the status on a vCPU0 vmexit. Looking at the VFIO code made me throw up in my mouth a little bit, but I just won't do that again... :) --=-cGV77bQ1tOYVa654+URr 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 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