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 81E9CC54EBC for ; Thu, 12 Jan 2023 08:07:09 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pFsbP-0000HQ-9V; Thu, 12 Jan 2023 03:06:23 -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 1pFsb3-0000DN-9A for qemu-devel@nongnu.org; Thu, 12 Jan 2023 03:06:04 -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 1pFsb0-0007C0-8h for qemu-devel@nongnu.org; Thu, 12 Jan 2023 03:06:00 -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=uyKN+aT95Id1eM5hPObLXyVR8XDZGo8SHlgNuPpQdeA=; b=UPZEUqxPUgHuQchwozWFnKTtNq ZSHaGJ50FOP1QVU7hgtH74WWWciNRH99ybXEAzEsBaCmUKlVhwlzNiDzQB3YHT9OXWXfKhPtDJpQo JqTz0d8Iw7fxOSZuTQBOFQ1iJACMuyqS7blTStpgbToD89K4T7zTSDKZfBaVPPWjNfmzrCBS5m078 t1P8LF5ovSpFl9r/dtZx+pXNWr0pPfDOBOTW0PVxcsHBDLDW6AoBPdJdTHI1W/MJl9UAqlbB5k1B5 xGRTePK4ApCyvfqSTfVWMri0RyB7EDjOScy8JBGaW9sTewDa4uJ3Wp3eSlYGiKdQwDEjMNLIEpaaO H1mVa8tA==; 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 1pFsat-004tXV-JC; Thu, 12 Jan 2023 08:05:51 +0000 Message-ID: <1d977482d1349b4294ac7cbd98c121b8b5ecd205.camel@infradead.org> Subject: Re: [RFC] Notify IRQ sources of level interrupt ack/EOI From: David Woodhouse To: Alex Williamson Cc: "Michael S. Tsirkin" , qemu-devel@nongnu.org, Marcel Apfelbaum , Paolo Bonzini , Richard Henderson , Eduardo Habkost , Marcelo Tosatti , paul@xen.org Date: Thu, 12 Jan 2023 08:05:37 +0000 In-Reply-To: <20230111124319.405bf5ef.alex.williamson@redhat.com> References: <23caafffdd9546b8eeff851660015f3bfc021ed3.camel@infradead.org> <20230111112425-mutt-send-email-mst@kernel.org> <70eb35a08a7c48993812b7f088fa9ae3f2c8b925.camel@infradead.org> <20230111112947.22237481.alex.williamson@redhat.com> <458b3d6af1ad4e5e44e1eac0b05692805e32a070.camel@infradead.org> <20230111124319.405bf5ef.alex.williamson@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-gbiiZgMKTPY/M5Evg/jX" 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+ba915ff7525d9a5f15e2+7081+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 --=-gbiiZgMKTPY/M5Evg/jX Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2023-01-11 at 12:43 -0700, Alex Williamson wrote: > On Wed, 11 Jan 2023 19:08:44 +0000 > David Woodhouse wrote: >=20 > > On Wed, 2023-01-11 at 11:29 -0700, Alex Williamson wrote: > > >=20 > > > Nice.=C2=A0 IIRC, we ended up with the hack solution we have today in= vfio > > > because there was too much resistance to callbacks that were only > > > necessary for vfio in the past.=C2=A0 Once we had KVM resampling supp= ort, > > > it simply wasn't worth the effort for a higher latency solution to > > > fight that battle, so we implemented what could best be described as > > > a universal workaround embedded in vfio. > > >=20 > > > Clearly a callback is preferable, and yes, that's how we operate with > > > KVM resampling and unmasking INTx, so in theory plumbing this to our > > > existing eoi callback and removing the region toggling ought to do > > > the right thing.=C2=A0 Thanks,=C2=A0=20 > >=20 > > Well, I'm happy for the Xen support be a second use case which means > > it's no longer "only necessary for VFIO", and keep prodding at it if > > that's going to be useful... >=20 > Welcome aboard.=C2=A0 I take it from your cover letter than non-x86 > architectures would be on your todo list.=C2=A0 Ideally the ack callback > would simply be a requirement for any implementation of a new interrupt > controller, but that's where we get into striking a balance of device > assignment imposing requirements on arbitrary architectures that may or > may not care, or even support, device assignment. >=20 > This is the... dare I say, elegance of the region access hack.=C2=A0 It's > obviously not pretty or performant, but it universally provides an > approximation of the behavior of an emulated device, ie. some form of > guest access to the device is required to de-assert the interrupt. >=20 > We probably need some way to detect the interrupt controller support > for the callback mechanism so we can generate an appropriate user > warning to encourage development of that support and fall back to our > current hack for some degree of functionality.=C2=A0 Thanks, The other thing I'd like to do is figure out the semantics of the callback. Right now I've gone for "return true to clear the level" and that makes me cringe a little bit because in the VFIO case, the callback will re-enable the IRQ in the kernel *before* returning true and the irqchip actually clearing its s->irr. Which could *theoretically* race with the next interrupt happening and setting the IRR before it's cleared. Although I don't think that actually happens in practice in qemu because the eventfd would be processed in the same thread? But I'm not sure I like it; it feels wrong. One option is for the generic processing to go "if there *is* a callback, zero the IRR first and then call the callback". Which fixes the above race, but you do rely on the drivers to *actually* reassert it. Which might be OK because it only has to propagate up one level up the IRQ link chain at a time =E2=80=94 e.g. to the PCI INTx code, which wou= ld then process the given INT[ABCD] line and call back those drivers which *have* a callback to resample *their* state, then recalculate the overall level based on the corresponding irq_count. I also wasn't sure if I want to allow calling qemu_set_irq() from the callback itself, instead of having it return a boolean. That might let the *callback* worry about when to clear/set the level. It doesn't work well with shared interrupts in some cases, because the race still exists if callback B zeroes the IRQ level after callback A already did so *and* reasserted it. But I think shared interrupts are hosed anyway if e.g. HPET links to the same GSI that a PCI INTx is routed to; they overwrite each other's state instead of it being a logical OR of the two? To share interrupts we need *explicit* muxing like the PCI code has with its irq_count handling. This last option has the advantage that it maps directly to the existing VFIO EOI callback, e.g. vfio_intx_eoi(). It's probably where I'll start. --=-gbiiZgMKTPY/M5Evg/jX 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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