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 2B5A4C433EF for ; Fri, 17 Dec 2021 17:12:56 +0000 (UTC) Received: from localhost ([::1]:47142 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1myGmr-0004KP-Si for qemu-devel@archiver.kernel.org; Fri, 17 Dec 2021 12:12:54 -0500 Received: from eggs.gnu.org ([209.51.188.92]:49072) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1myGSC-0001L0-R8 for qemu-devel@nongnu.org; Fri, 17 Dec 2021 11:51:32 -0500 Received: from [2607:7c80:54:e::133] (port=37084 helo=bombadil.infradead.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1myGSA-0000e5-Dh for qemu-devel@nongnu.org; Fri, 17 Dec 2021 11:51:32 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; 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=PdZd2/fP+RWLkgOJmKa22wHAYOpj7wygNSr6gXt0GHA=; b=tG/cdSxh1ZpdjXRNotUOsZ8Xsw eP4HtwEis6AsftbL0d/TTbawm78VQSd8fzK6h3NcUBdUE7wNlhAhxhDSbxJq6YZirkITTgStdNXkv fIDRxezrYfZZBZ7S4InffmOEYfhfF+oVhJhUp2+CPLMv9NOLzRy9kMAsIjwsCFiopvB8HqAT60JX/ aH0HGKgPjBgiIFnWUCCrLxXNns+3o6aHVN7J2SiyIXEdXLSnTQdVoG26tPQqEKLz2PcdDJVNH48aC Y7OZXZlvOWYTvlHLM6z5sp+dyo3bc5KZXn5g6RxAkP7aT2GZ1xVloAbc4i25pGDurDPcQpnZmjM5Q w0qBPF5w==; Received: from [2001:8b0:10b:1::3ae] (helo=u3832b3a9db3152.ant.amazon.com) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1myGS4-00BH0i-4g; Fri, 17 Dec 2021 16:51:24 +0000 Message-ID: Subject: Re: [PATCH v2 4/4] intel_iommu: Fix irqchip / X2APIC configuration checks From: David Woodhouse To: Peter Xu Date: Fri, 17 Dec 2021 16:51:20 +0000 In-Reply-To: References: <20211209220840.14889-1-dwmw2@infradead.org> <20211209220840.14889-4-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-mxCmuhdQSps0LN6xXixe" User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:7c80:54:e::133 (failed) Received-SPF: none client-ip=2607:7c80:54:e::133; envelope-from=BATV+d8ed1b7332095c0ed07b+6690+infradead.org+dwmw2@bombadil.srs.infradead.org; helo=bombadil.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 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: Eduardo Habkost , kvm@vger.kernel.org, "Michael S. Tsirkin" , Jason Wang , Marcelo Tosatti , Richard Henderson , qemu-devel@nongnu.org, Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" --=-mxCmuhdQSps0LN6xXixe Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2021-12-16 at 16:47 +0800, Peter Xu wrote: > Hi, David, >=20 > On Thu, Dec 09, 2021 at 10:08:40PM +0000, David Woodhouse wrote: > > We don't need to check kvm_enable_x2apic(). It's perfectly OK to suppor= t > > interrupt remapping even if we can't address CPUs above 254. Kind of > > pointless, but still functional. >=20 > We only checks kvm_enable_x2apic() if eim=3Don is set, right? I mean, we= can > still enable IR without x2apic even with current code? >=20 > Could you elaborate what's the use scenario for this patch? Thanks in ad= vance. You can have IR, EIM *and* X2APIC if kvm_enable_x2apic() fails. You just can't have any CPUs with an APIC ID > 254. But qemu is going to bail out *anyway* if you attempt to have CPUs with APIC IDs above 254 without the corresponding kernel-side support, so there's no need to check it here. > > The check on kvm_enable_x2apic() needs to happen *anyway* in order to > > allow CPUs above 254 even without an IOMMU, so allow that to happen > > elsewhere. > >=20 > > However, we do require the *split* irqchip in order to rewrite I/OAPIC > > destinations. So fix that check while we're here. > >=20 > > Signed-off-by: David Woodhouse > > Reviewed-by: Peter Xu > > Acked-by: Jason Wang >=20 > I think the r-b and a-b should be for patch 2 not this one? :) >=20 Yes, I think I must have swapped those round. Thanks. > > --- > > hw/i386/intel_iommu.c | 7 +------ > > 1 file changed, 1 insertion(+), 6 deletions(-) > >=20 > > diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c > > index bd288d45bb..0d1c72f08e 100644 > > --- a/hw/i386/intel_iommu.c > > +++ b/hw/i386/intel_iommu.c > > @@ -3760,15 +3760,10 @@ static bool vtd_decide_config(IntelIOMMUState *= s, Error **errp) > > ON_OFF_AUTO_ON : ON_OFF_= AUTO_OFF; > > } > > if (s->intr_eim =3D=3D ON_OFF_AUTO_ON && !s->buggy_eim) { > > - if (!kvm_irqchip_in_kernel()) { > > + if (!kvm_irqchip_is_split()) { >=20 > I think this is okay, but note that we'll already fail if !split in > x86_iommu_realize(): >=20 > bool irq_all_kernel =3D kvm_irqchip_in_kernel() && !kvm_irqchip_is_sp= lit(); >=20 > /* Both Intel and AMD IOMMU IR only support "kernel-irqchip=3D{off|sp= lit}" */ > if (x86_iommu_ir_supported(x86_iommu) && irq_all_kernel) { > error_setg(errp, "Interrupt Remapping cannot work with " > "kernel-irqchip=3Don, please use 'split|off'."); > 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