linux-kernel - Re: [PATCH 2/4] x86: always initialize xen-swiotlb when xen-pcifront is enabling

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Date:   Fri, 19 May 2023 14:58:57 +0200
From:   Christoph Hellwig <hch@....de>
To:     Andrew Cooper <andrew.cooper3@...rix.com>
Cc:     Christoph Hellwig <hch@....de>,
        Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>, Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, Ben Skeggs <bskeggs@...hat.com>,
        Karol Herbst <kherbst@...hat.com>,
        Lyude Paul <lyude@...hat.com>, xen-devel@...ts.xenproject.org,
        iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
        nouveau@...ts.freedesktop.org
Subject: Re: [PATCH 2/4] x86: always initialize xen-swiotlb when
 xen-pcifront is enabling

On Fri, May 19, 2023 at 01:49:46PM +0100, Andrew Cooper wrote:
> > The alternative would be to finally merge swiotlb-xen into swiotlb, in
> > which case we might be able to do this later.  Let me see what I can
> > do there.
> 
> If that is an option, it would be great to reduce the special-cashing.

I think it's doable, and I've been wanting it for a while.  I just
need motivated testers, but it seems like I just found at least two :)