linux-kernel - Re: [RFT][PATCH v2 9/9] vfio: Replace phys_pfn with pages for vfio_pin

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Date:   Thu, 7 Jul 2022 10:03:23 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
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Subject: Re: [RFT][PATCH v2 9/9] vfio: Replace phys_pfn with pages for
 vfio_pin_pages()

On Thu, Jul 07, 2022 at 08:49:28AM +0000, Tian, Kevin wrote:
> External email: Use caution opening links or attachments
> 
> 
> > From: Nicolin Chen <nicolinc@...dia.com>
> > Sent: Wednesday, July 6, 2022 2:28 PM
> >
> > Most of the callers of vfio_pin_pages() want "struct page *" and the
> > low-level mm code to pin pages returns a list of "struct page *" too.
> > So there's no gain in converting "struct page *" to PFN in between.
> >
> > Replace the output parameter "phys_pfn" list with a "pages" list, to
> > simplify callers. This also allows us to replace the vfio_iommu_type1
> > implementation with a more efficient one.
> 
> worth mentioning that vfio pin is only for struct page * hence the
> pfn_valid() check in gvt can be removed.

Will add that.

> >
> > For now, also update vfio_iommu_type1 to fit this new parameter too.
> >
> > Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> 
> Reviewed-by: Kevin Tian <kevin.tian@...el.com>

Thanks for the review!