linux-kernel - Re: [RFT][PATCH v1 3/6] vfio: Pass in starting IOVA to vfio_pin/unpin

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Message-ID: <YrJt43HQnoKSIIM3@Asurada-Nvidia>
Date:   Tue, 21 Jun 2022 18:18:27 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Christoph Hellwig <hch@...radead.org>
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Subject: Re: [RFT][PATCH v1 3/6] vfio: Pass in starting IOVA to
 vfio_pin/unpin_pages API

On Fri, Jun 17, 2022 at 01:42:42AM -0700, Christoph Hellwig wrote:
> On Thu, Jun 16, 2022 at 04:52:09PM -0700, Nicolin Chen wrote:
> > +	ret = vfio_unpin_pages(&vgpu->vfio_device, gfn << PAGE_SHIFT, npage);
> > +	drm_WARN_ON(&i915->drm, ret != npage);
> 
> The shifting of gfn seems to happen bother here and in the callers.

Sorry. I overlooked this line. I can add another preparatory patches
for callers to pass in an IOVA other than "pfn << PAGE_SHIFT", if you
think it's necessary: although GVT still does things in PFN, both ap
and ccw prepare their PFN lists from IOVAs, which now can be omitted.