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 983DBC433F5 for ; Mon, 14 Mar 2022 13:23:56 +0000 (UTC) Received: from localhost ([::1]:59226 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nTkfy-0001FU-H0 for qemu-devel@archiver.kernel.org; Mon, 14 Mar 2022 09:23:55 -0400 Received: from eggs.gnu.org ([209.51.188.92]:33364) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nTkIo-0003vv-Lt for qemu-devel@nongnu.org; Mon, 14 Mar 2022 08:59:58 -0400 Received: from [2001:8b0:10b:1236::1] (port=41612 helo=casper.infradead.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nTkIl-0002fq-NJ for qemu-devel@nongnu.org; Mon, 14 Mar 2022 08:59:58 -0400 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=LLVARDIxOrU10KHbYUbBHdn9l99ZBxbLucn9wzFRAuQ=; b=LVXGzabe8dC4XIeqvFQuYwSqAD 9Td5CyH6JhGk/+r/UMSKaB49h72TfzDlpUQk9yeJf5xAQuCLt10ebMjjErvMSCKopAjKfnD06p6Mh C6EjBKcZvQmsEXm+c0a5CsTqR98u5xTkk7RP7qhi3tgzRax4RFwxsYe7rH/uskMbrVjbb/PKf0PEE CjgwUJSNOaz1EXjYrrPwL3xF/+I2PsFK+Gws5kJbCqqKvYys2/94hrxglBt0IjcnN6nMDwGEc0mNu 5X2Ae5kb+d/BIdBPwJ/2lOhv9a8LRLyGkXWqyQltNRlvfhdgut2kGMFQrWKuB8eRgeuajeosjsTuZ sQyaqYIw==; Received: from [2001:8b0:10b:1:4a2a:e3ff:fe14:8625] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nTkIW-0043t8-KT; Mon, 14 Mar 2022 12:59:40 +0000 Message-ID: <0d0f10cf1e593be0fb4546749cd7ee11765accb5.camel@infradead.org> Subject: Re: [PATCH] x86: q35: require split irqchip for large CPU count From: David Woodhouse To: Igor Mammedov Date: Mon, 14 Mar 2022 12:59:38 +0000 In-Reply-To: <20220314113532.10518837@redhat.com> References: <20220311143901.96481-1-imammedo@redhat.com> <8d4912d595bcaca36013e22060c22c1bfe3c44c1.camel@infradead.org> <20220314113532.10518837@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-WevNUiU3xOlzH6pKBP+o" User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-Host-Lookup-Failed: Reverse DNS lookup failed for 2001:8b0:10b:1236::1 (failed) Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+a709675fe440e0b94d32+6777+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 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, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: , Cc: pbonzini@redhat.com, qemu-devel@nongnu.org, mst@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" --=-WevNUiU3xOlzH6pKBP+o Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2022-03-14 at 11:35 +0100, Igor Mammedov wrote: > On Fri, 11 Mar 2022 14:58:41 +0000 > David Woodhouse < > dwmw2@infradead.org > > wrote: >=20 > > On Fri, 2022-03-11 at 09:39 -0500, Igor Mammedov wrote: > > > if VM is started with: > > >=20 > > > -enable-kvm -smp 256 > > >=20 > > > without specifying 'split' irqchip, VM might eventually boot > > > but no more than 255 CPUs will be operational and following > > > error messages in guest could be observed: > > > ... > > > smpboot: native_cpu_up: bad cpu 256 > > > ... > > > It's a regression introduced by [1], which removed dependency > > > on intremap=3Don that were implicitly requiring 'split' irqchip > > > and forgot to check for 'split' irqchip. > > > Instead of letting VM boot a broken VM, error out and tell > > > user how to fix CLI. =20 > >=20 > > Hm, wasn't that already fixed in the patches I posted in December? >=20 > It might be, could you point to the commit/series that fixed it. https://lore.kernel.org/all/20211209220840.14889-1-dwmw2@infradead.org/ is the patch I was thinking of, but although that moves the check to a more useful place and fixes the X2APIC check, it *doesn't* include the fix you're making; it's still using kvm_irqchip_in_kernel(). I can change that and repost the series, which is still sitting (with fixed Reviewed-By/Acked-By attributions that I screwed up last time) in https://git.infradead.org/users/dwmw2/qemu.git > Regardless of that, fixing it in recent kernels doesn't help > as still supported kernels are still affected by it. >=20 > If there is a way to detect that fix, I can add to q35 a compat > property and an extra logic to enable kernel-irqchip if fix is present. > Otherwise the fix does not exist until minimum supported kernel > version reaches version where it was fixed. Hm, I'm not sure I follow here. Do you mean recent versions of *qemu* when you say 'kernels'?=20 I'm not even sure I agree with the observation that qemu should error out here. The guest boots fine and the guest can even *use* all the CPUs. IPIs etc. will all work fine. The only thing that doesn't work is delivering *external* interrupts to CPUs above 254. Ultimately, this is the *guest's* problem. Some operating systems can cope; some can't. The fact that *Linux* has a fundamental assumption that *all* CPUs can receive all interrupts and that affinity can't be limited in hardware, is a Linux problem. I tried to fix it once but it was distinctly non- trivial and eventually I gave up and took a different approach. https://lore.kernel.org/linux-iommu/87lfgj59mp.fsf@nanos.tec.linutronix.de/= T/ But even if we 'fix' the check as you suggest to bail out and refuse to boot a certain configuration because Linux guest wouldn't be able to fully utilize it... Even if we boot with the split IRQ chip and the 15- bit MSI enlightenment, we're still in the same position. Some guests will be able to use it; some won't. In fact, there are operating systems that don't even know about X2APIC. 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