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Message-ID: <5c86570ce3bedb90514bc1e73b96011660f520b0.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:   Wed, 11 Nov 2020 08:16:46 +0000
In-Reply-To: <87tutwg76j.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>
         <82d54a74-af90-39a4-e483-b3cd73e2ef03@amd.com>
         <78be575e10034e546cc349d65fac2fcfc6f486b2.camel@infradead.org>
         <877dqtgkzb.fsf@nanos.tec.linutronix.de>
         <874klxghwu.fsf@nanos.tec.linutronix.de>
         <45B3C20C-3BBB-40F3-8A7B-EB20EDD0706F@infradead.org>
         <87y2j9exk2.fsf@nanos.tec.linutronix.de>
         <8C2E184C-D069-4C60-96B5-0758FBC6E402@infradead.org>
         <d4115cc7-3876-e012-b6ec-c525d608834f@amd.com>
         <87tutwg76j.fsf@nanos.tec.linutronix.de>
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On Tue, 2020-11-10 at 23:48 +0100, Thomas Gleixner wrote:
> + * IRQCHIP_MSI_EXTID                 The MSI message created for this ch=
ip can
> + *                                   have an otherwise forbidden extende=
d ID

If we're going to do that then we could ditch the separate
iommu_compose_msi_msg() function too, right?

But actually I'd be more inclined to fix this differently, in a way
that doesn't still leave AMD's iommu_init_intcapxt() having to set use
irq_set_affinity_notifier() to update its own registers. That's icky.

Given that this is *its* irqdomain in the first place, it should just
sit at ->set_affinity() for itself, and call its parent as usual
without having to use a notifier.

We should also leave it using the basic PCI MSI support in the case
where the IOMMU doesn't have XTSUP support. It doesn't need its own
irqdomain for that.


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