linux-kernel - Re: [EXTERNAL] [tip: x86/apic] x86/io_apic: Cleanup trigger/polarity helpers

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Date:   Wed, 11 Nov 2020 14:30:55 -0600
From:   Tom Lendacky <thomas.lendacky@....com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>
Cc:     linux-kernel@...r.kernel.org, x86 <x86@...nel.org>,
        Qian Cai <cai@...hat.com>, Joerg Roedel <joro@...tes.org>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: Re: [EXTERNAL] [tip: x86/apic] x86/io_apic: Cleanup trigger/polarity
 helpers

On 11/11/20 6:32 AM, David Woodhouse wrote:
> On Wed, 2020-11-11 at 10:36 +0000, David Woodhouse wrote:
>> On Wed, 2020-11-11 at 10:46 +0100, Thomas Gleixner wrote:
>>> Looking at it now with brain awake, the XTSUP stuff is pretty much
>>> the same as DMAR, which I didn't realize yesterday. The affinity
>>> notifier muck is not needed when we have a write_msg() function which
>>> twiddles the bits into those other locations.
>>
>> I kind of hate the fact that it's swizzling those bits through invalid
>> MSI messages, so I did it as its own irqdomain using
>> irq_domain_create_hierarchy() directly instead of
>> msi_create_irq_domain().
> 
> Please give this a spin:
> 
> https://git.infradead.org/users/dwmw2/linux.git/shortlog/refs/heads/amdvi

I had trouble cloning your tree for some reason, so just took the top
three patches and applied them to the tip tree. This all appears to be
working. I'll let the IOMMU experts take a closer look (adding Suravee).

Thanks,
Tom

>