linux-kernel - Re: [PATCH 5/5] x86/kvm: Add KVM_FEATURE_MSI_EXT_DEST

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Date:   Sat, 10 Oct 2020 13:44:10 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     David Woodhouse <dwmw2@...radead.org>, x86@...nel.org
Cc:     kvm <kvm@...r.kernel.org>, Paolo Bonzini <pbonzini@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/5] x86/kvm: Add KVM_FEATURE_MSI_EXT_DEST_ID

On Sat, Oct 10 2020 at 11:06, David Woodhouse wrote:
> On Fri, 2020-10-09 at 01:27 +0200, Thomas Gleixner wrote:
>> On Thu, Oct 08 2020 at 22:39, David Woodhouse wrote:
>> For the next submission, can you please
>> 
>>  - pick up the -ENODEV changes for HPET/IOAPIC which I posted earlier
>
> I think the world will be a nicer place if HPET and IOAPIC have their
> own struct device and their drivers can just use dev_get_msi_domain().
>
> The IRQ remapping drivers already plug into the device-add notifier and
> can fill in the appropriate MSI domain just like they do¹ for PCI and
> ACPI devices.
>
> Using platform_add_bundle() for HPET looks trivial enough; I'll have a
> play with that and then do IOAPIC too if/when the initialisation order
> and hotplug handling all works out OK to install the correct
> msi_domain.

Yes, I was wondering about that when I made PCI at least use that
mechanism, but had not had time to actually look at it.

Thanks,

        tglx