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 X-Spam-Level: X-Spam-Status: No, score=-5.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id ED498C433E7 for ; Mon, 19 Oct 2020 12:24:48 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id D69A122268 for ; Mon, 19 Oct 2020 12:24:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="hySh44LP" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D69A122268 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:59348 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kUUDW-0002R3-Ck for qemu-devel@archiver.kernel.org; Mon, 19 Oct 2020 08:24:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57174) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kUUAU-0001SG-Bf for qemu-devel@nongnu.org; Mon, 19 Oct 2020 08:21:38 -0400 Received: from merlin.infradead.org ([2001:8b0:10b:1231::1]:43732) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kUUAQ-0005Ju-LP for qemu-devel@nongnu.org; Mon, 19 Oct 2020 08:21:37 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.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=3oHfWUXk3qVFMnHH5ircx03MhaN2SxWFEIH3A81Swgc=; b=hySh44LPVSY4Dgz9w+cQKmuY+t iuzjsHPcmw1RsXbMnzWqZb65fUIvwUpPSTGeEuNETHQJCK8xK7SaalIgqQqyxL8QoUbZLa7E4yrOL bTEK+K4dOiy0eKm5F3ME8RN66PtvG68vP8Au1Q2+44OXAkl8/3RZ/KEenelZra6DZB/kA4U3a0pDP pk9ZCsSIVtvRPQ2dlux1rgW9ssC3fAQ/NIxMjlO6ake4IrrvncTw8pLEy8BmNTdaoX9zP8y4w65R8 nZTQDfl2+INNCqQtGFNgkxTmHmE6bQA/cXygJDikZLACwjfOcPE2U5MrpRJgl2vdMvRYGeD1SAtBB 8sMM5xLw==; Received: from 54-240-197-236.amazon.com ([54.240.197.236] helo=freeip.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kUUAE-0001kQ-LE; Mon, 19 Oct 2020 12:21:22 +0000 Message-ID: Subject: Re: [PATCH] target/i386: Support up to 32768 CPUs without IRQ remapping From: David Woodhouse To: Paolo Bonzini , qemu-devel Date: Mon, 19 Oct 2020 13:21:20 +0100 In-Reply-To: <7b9c8ca4-e89e-e140-d591-76dcb2cad485@redhat.com> References: <78097f9218300e63e751e077a0a5ca029b56ba46.camel@infradead.org> <6f8704bf-f832-9fcc-5d98-d8e8b562fe2f@redhat.com> <698c8ab6783a3113d90d8435d07a2dce6a2e2ec9.camel@infradead.org> <7b9c8ca4-e89e-e140-d591-76dcb2cad485@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-DaYkaLxGml+9Bwtl8RWR" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1231::1; envelope-from=BATV+65ffd12918cbad140a0b+6266+infradead.org+dwmw2@merlin.srs.infradead.org; helo=merlin.infradead.org X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: x86 , kvm Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" --=-DaYkaLxGml+9Bwtl8RWR Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2020-10-08 at 09:53 +0200, Paolo Bonzini wrote: > Indeed the nice thing about irqchip=3Dsplit is that the handling of devic= e > interrupts is entirely confined within QEMU, no matter if they're IOAPIC > or MSI. And because we had to implement interrupt remapping, the IOAPIC > is effectively using MSIs to deliver its interrupts. >=20 > There's still the hack to communicate IOAPIC routes to KVM and have it > set the EOI exit bitmap correctly, though. The code is in > kvm_scan_ioapic_routes and it uses kvm_set_msi_irq (with irqchip=3Dsplit > everything is also an MSI within the kernel). I think you're not > handling that correctly for CPUs >255, so after all we _do_ need some > kernel support. I think that works out OK. In QEMU's ioapic_update_kvm_routes() it calls ioapic_entry_parse() which generates the actual "bus" MSI with the extended dest ID in bits 11-5 of the address. That MSI message is passed to kvm_irqchip_update_msi_route() which passes it through translation =E2=80=94 which does interrupt remapping and shifting the ext bits up into ->address_hi as the KVM X2APIC API expects. So when the kernel's kvm_scan_ioapic_routes() goes looking, kvm_set_msi_irq() fills 'irq' in with the correct dest_id, and kvm_apic_match_dest() does the right thing. No? As far as I can tell, we *do* have a QEMU bug =E2=80=94 not related to the = ext dest ID =E2=80=94 because for MSIs of assigned devices we don't update the = KVM IRQ routing table when the Interrupt Remapping IEC cache is flushed. > Paolo >=20 > > > I queued this, though of course it has to wait for the corresponding > > > kernel patches to be accepted (or separated into doc and non-KVM > > > parts; we'll see). > >=20 > > Thanks. So... it'll hit the tip.git tree and thus linux-next as soon as Linus releases 5.10-rc1, and it'll then get merged into 5.11-rc1 and be in the 5.11 release. At which of those three points in time would you be happy to merge it to QEMU? If it's either of the latter two, maybe it *is* worth doing a patch which *only* reserves the feature bit, and trying to slip it into 5.10? --=-DaYkaLxGml+9Bwtl8RWR Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q 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