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 CD870C6FD1B for ; Mon, 6 Mar 2023 17:28:58 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pZEdX-0004xj-KI; Mon, 06 Mar 2023 12:28:35 -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 1pZEdV-0004xT-BL for qemu-devel@nongnu.org; Mon, 06 Mar 2023 12:28:33 -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 1pZEdS-0001Uu-6h for qemu-devel@nongnu.org; Mon, 06 Mar 2023 12:28:32 -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=WsaQKL1H7SfI6JewaucFawuIeJ4F19d1lRkdYgtGbdk=; b=DDIKejscf8auUaIoavcmwlNOvR do7ViZAXAcK+PyzBdHZLQRaXPkkPp0wdo5a3rOnHwViGfn50kz3vw/O6c/He3RrG38X6G+YbJqLLI 2zasX8ffyVfiLAq2h1yer0EEufX/Zmkks710wEDsphVDdplJEe+fqYqC1EFhI2csm+elQMkrCdESw 6NdEW7adkEdhTlsNkDCIajf86amTgn7i3BKroo5iRCCqabXcFQrXEjIzPFWwcDQOKa2IcVGTgvkzZ 1Voo72aHHLLV802vwIWHsC/6CVeVlec+UtHA30IHqBjSHuZTSzRmsWIqGa8Y6cLZhy+dEI2uefkh+ 1S/XJeqg==; Received: from [2001:8b0:10b:5:c09:fa3d:b1cb:4d7e] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pZEdO-005WwN-0N; Mon, 06 Mar 2023 17:28:26 +0000 Message-ID: <55bab93ee00619ac5b5b7416c17aee175ada8a8b.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 17:28:24 +0000 In-Reply-To: References: <6E7EA2EE-382C-4345-9A2A-D61E0139FB65@infradead.org> <34f494519d1921e8b62a6f3e709511a9467df54d.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-vuVVvu/mCMwFT+kTiH0x" 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 --=-vuVVvu/mCMwFT+kTiH0x Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2023-03-06 at 11:39 -0500, Peter Xu wrote: > On Mon, Mar 06, 2023 at 09:25:35AM +0000, David Woodhouse wrote: > > I think if we want to fix the lack of IR translation faults from the > > IOMMU, we have to change this anyway. > >=20 > > At the very least, it can only use KVM to deliver the IRQ if there *is* > > a valid translation. And if not, it needs to ask the IOMMU to > > retranslate, with a 'delivering_now' flag indicating that the fault > > should be raised because this isn't a preemptive translation in > > advance. >=20 > I see that as a separate problem of what this patch wants to (rightfully) > fix.=C2=A0 >=20 Agreed. Which is why I didn't just rip the kvm_set_irq() out and call it fixed, and put that discussion below the ^--- cutoff. > I also agree we'll need that if e.g. we want to support ioapic in > kvm. > > Sorry in advancie since I don't think I have the whole picture here.=C2= =A0 Could > you remind me the whole purpose of having such?=C2=A0 Is that for part of= Xen's > effort? >=20 > It was a long time ago, but IIRC such mechanism wasn't implemented when w= e > worked on vIOMMU IR initially, because at least at that time the "keeping > kvm irq routes always updated when IRQ entries modified" was good enough > for qemu to work with IR. >=20 > The only outlier was in-kernel ioapic, but there was a talk from Google > showing that in kernel ioapic brought mostly nothing good but more exposu= re > on attack surface.=C2=A0 It does sound reasonable since fast devices shou= ldn't > use ioapic at all to me, so IIRC the plan was split irqchip should be > always optimal hence no immediate concern of not supporting IR with > in-kernel ioapic.=C2=A0 But I definitely can miss important things along = the > way. Indeed, I don't think we care about the in-kernel I/OAPIC. I don't think we care about the kernel knowing about e.g. "GSI #11" at all. We can just deliver it as MSI (for the I/OAPIC) or using KVM_INTERRUPT and the interrupt window as we do for the PIC. Which is why I'd happily rip that out and let it be delivered via the APIC intercept at 0xfeexxxxx. The existing code which just keeps IRQ routes updated when they're valid is kind of OK, and well-behaved guests can function. But it isn't *right* in the case where they aren't valid. What *ought* to happen is that the IOMMU should raise a fault at the moment the interrupt occurs, if the translation isn't valid. And we don't have that at all. As for why I care? I don't really *need* it, as I have everything I need for Xen PIRQ support already merged in=20 https://gitlab.com/qemu-project/qemu/-/commit/6096cf7877 So while the thread at https://lore.kernel.org/qemu-devel/aaef9961d210ac1873153bf3cf01d984708744fc= .camel@infradead.org/ was partly driven by expecting to need this for Xen PIRQ support (because in $DAYJOB I did those things in the other order and the PIRQ support ended up just being a trivial different translator like the IOMMU's IR)... I'd still quite like to fix it up in QEMU anyway, just for correctness and fidelity in the faulting cases. We can do more efficient invalidation too, rather than blowing away the entire routing table every time. Just disconnect the IRQFD for the specific interrupts that get invalidated, and let them get fixed up again next time they occur. --=-vuVVvu/mCMwFT+kTiH0x 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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