linux-kernel - Re: [RFT][PATCH v2 0/9] Update vfio_pin/unpin

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Date:   Fri, 8 Jul 2022 13:31:47 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Eric Farman <farman@...ux.ibm.com>
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Subject: Re: [RFT][PATCH v2 0/9] Update vfio_pin/unpin_pages API

On Fri, Jul 08, 2022 at 04:30:32PM -0400, Eric Farman wrote:
> External email: Use caution opening links or attachments
> 
> 
> On Tue, 2022-07-05 at 23:27 -0700, Nicolin Chen wrote:
> > This is a preparatory series for IOMMUFD v2 patches. It prepares for
> > replacing vfio_iommu_type1 implementations of vfio_pin/unpin_pages()
> > with IOMMUFD version.
> >
> > There's a gap between these two versions: the vfio_iommu_type1
> > version
> > inputs a non-contiguous PFN list and outputs another PFN list for the
> > pinned physical page list, while the IOMMUFD version only supports a
> > contiguous address input by accepting the starting IO virtual address
> > of a set of pages to pin and by outputting to a physical page list.
> >
> > The nature of existing callers mostly aligns with the IOMMUFD
> > version,
> > except s390's vfio_ccw_cp code where some additional change is needed
> > along with this series. Overall, updating to "iova" and "phys_page"
> > does improve the caller side to some extent.
> >
> > Also fix a misuse of physical address and virtual address in the
> > s390's
> > crypto code. And update the input naming at the adjacent
> > vfio_dma_rw().
> >
> > This is on github:
> > https://github.com/nicolinc/iommufd/commits/vfio_pin_pages
> >
> > Request for testing: I only did build for s390 and i915 code, so it'd
> > be nice to have people who have environment to run sanity
> > accordingly.
> 
> Tested-by: Eric Farman <farman@...ux.ibm.com>   # s390

Thank you for the review and test!