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 08173C433E7 for ; Thu, 8 Oct 2020 07:32:06 +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 3328B2168B for ; Thu, 8 Oct 2020 07:32:05 +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="AIC4Hsui" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3328B2168B 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]:57832 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kQQPE-0007C4-1s for qemu-devel@archiver.kernel.org; Thu, 08 Oct 2020 03:32:04 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:58934) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kQQMe-0005YX-AN for qemu-devel@nongnu.org; Thu, 08 Oct 2020 03:29:26 -0400 Received: from merlin.infradead.org ([2001:8b0:10b:1231::1]:39384) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kQQMa-0006K3-30 for qemu-devel@nongnu.org; Thu, 08 Oct 2020 03:29:23 -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=jKHmP0GlGXL7e4/MVu+kTGHCx43PbG1uSAdiISWuCPE=; b=AIC4HsuizoKCH67ZoK3b7acnx4 8GNPplxefThaXXMiTagoQyQwzP0UpNUo+nEQBlENXDMNcRlJ/1b+msG9roXH+bZrCR+y3tNB91Eh/ 2X3R6YfLkRB54yi42j6U9Gjfh2WR5L76Xn0hjtotjoz3dIJqhJpKUWNE7obxQkZsgkwbfNmYz0k/K TPXrey3SsPnFuz18i98CgXQfEoJseK0/xy0pMvwfenPJnHixA1pFqJyP2y/rY5AAcIbdt07X2VoGN gWbt5/nL+BSJD9G2jg1U+DPYY1W1pY6FQLKzTfX40b7XJ2c2HH1b8RyAUKWOuHtJ6WgfZYgejzMNP J213Z7Fg==; Received: from [54.239.6.188] (helo=freeip.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kQQMN-0006hw-SU; Thu, 08 Oct 2020 07:29:08 +0000 Message-ID: <698c8ab6783a3113d90d8435d07a2dce6a2e2ec9.camel@infradead.org> Subject: Re: [PATCH] target/i386: Support up to 32768 CPUs without IRQ remapping From: David Woodhouse To: Paolo Bonzini , qemu-devel Date: Thu, 08 Oct 2020 08:29:06 +0100 In-Reply-To: <6f8704bf-f832-9fcc-5d98-d8e8b562fe2f@redhat.com> References: <78097f9218300e63e751e077a0a5ca029b56ba46.camel@infradead.org> <6f8704bf-f832-9fcc-5d98-d8e8b562fe2f@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-5f6NtzhVYRaKfWP9Omf4" 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+9ad8aabd442e6f1bf9d8+6255+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" --=-5f6NtzhVYRaKfWP9Omf4 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2020-10-08 at 08:56 +0200, Paolo Bonzini wrote: > On 05/10/20 16:18, David Woodhouse wrote: > > + if (kvm_irqchip_is_split()) { > > + ret |=3D 1U << KVM_FEATURE_MSI_EXT_DEST_ID; > > + } >=20 > IIUC this is because in-kernel IOAPIC still doesn't work; and when it > does, KVM will advertise the feature itself so no other QEMU changes > will be needed. More the MSI handling than the IOAPIC. I haven't actually worked out *what* handles cycles to addresses in the 0xFEExxxxx range for the in- kernel irqchip and turns them into interrupts (after putting them through interrupt remapping, if/when the kernel learns to do that). Ideally the IOAPIC would just swizzle the bits in its RTE to create an MSI message and pass it on to the same code to be (translated and) delivered. You'll note my qemu patch didn't touch IOAPIC code at all, because qemu's IOAPIC really does just that. > 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). 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