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Message-ID: <9574251616840b634c2c6466ab15e4604f8ac9c2.camel@infradead.org>
Subject: Re: [EXTERNAL] [tip: x86/apic] x86/io_apic: Cleanup
 trigger/polarity helpers
From:   David Woodhouse <dwmw2@infradead.org>
To:     Thomas Gleixner <tglx@linutronix.de>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        Borislav Petkov <bp@alien8.de>
Cc:     linux-kernel@vger.kernel.org, x86 <x86@kernel.org>,
        Qian Cai <cai@redhat.com>, Joerg Roedel <joro@8bytes.org>
Date:   Tue, 10 Nov 2020 16:01:27 +0000
In-Reply-To: <87a6vpgqbt.fsf@nanos.tec.linutronix.de>
References: <20201024213535.443185-20-dwmw2@infradead.org>
         <160397373817.397.3191135882528008704.tip-bot2@tip-bot2>
         <e2e06979-cbcf-8771-0b48-c46f2d034aa8@amd.com>
         <20201110061046.GA7290@nazgul.tnic>
         <87d00lgu13.fsf@nanos.tec.linutronix.de>
         <9a003c2f-f59a-43ab-bbd5-861b14436d29@amd.com>
         <87a6vpgqbt.fsf@nanos.tec.linutronix.de>
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On Tue, 2020-11-10 at 16:54 +0100, Thomas Gleixner wrote:
> On Tue, Nov 10 2020 at 08:55, Tom Lendacky wrote:
> > On 11/10/20 8:34 AM, Thomas Gleixner wrote:
> > I was about to send the dmesg output when I saw this. A quick test
> > with
> > this change resolves the boot issue, thanks!
>=20
> /me feels stupid
>=20
> > I'm still seeing the warning at arch/x86/kernel/apic/apic.c:2527,
> > but I'll
> > start a separate thread on that.
>=20
> Can you please provide the backtrace?

We'll want something like this, to stop AMD IOMMU from registering its
irqdomain even when it shouldn't. But that's the wrong way round; that
would give you remapped MSIs when it should be using the
x86_vector_domain for them. And you have the converse, it seems.

--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -1601,9 +1601,11 @@ static int __init init_iommu_one(struct amd_iommu *i=
ommu, struct ivhd_header *h)
 	if (ret)
 		return ret;
=20
-	ret =3D amd_iommu_create_irq_domain(iommu);
-	if (ret)
-		return ret;
+	if (amd_iommu_irq_remap) {
+		ret =3D amd_iommu_create_irq_domain(iommu);
+		if (ret)
+			return ret;
+	}
=20
 	/*
 	 * Make sure IOMMU is not considered to translate itself. The IVRS


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