linux-kernel - Re: [PATCH vfio] vfio/pci: remove msi domain on msi disable

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Date:   Tue, 19 Sep 2023 02:57:35 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Shannon Nelson <shannon.nelson@....com>,
        alex.williamson@...hat.com, kevin.tian@...el.com,
        reinette.chatre@...el.com, kvm@...r.kernel.org,
        brett.creeley@....com, linux-kernel@...r.kernel.org,
        Leon Romanovsky <leonro@...dia.com>
Subject: Re: [PATCH vfio] vfio/pci: remove msi domain on msi disable

On Mon, Sep 18 2023 at 21:32, Jason Gunthorpe wrote:
> On Tue, Sep 19, 2023 at 02:25:32AM +0200, Thomas Gleixner wrote:
>
>> > I don't think we need to try and fix that..
>> 
>> We might want to detect it and yell about it, right?
>
> It strikes me as a good idea, yes. If it doesn't cost anything.

It should not be expensive in the interrupt allocation/deallocation
path, where hardware needs to be accessed anyway. So one extra read is
not the end of the world.

Thanks,

        tglx