Re: [PATCH v3] xen/privcmd: add IOCTL_PRIVCMD_MMAP_RESOURCE

[Boris Ostrovsky]

On 04/09/2018 05:36 AM, Paul Durrant wrote:
> My recent Xen patch series introduces a new HYPERVISOR_memory_op to
> support direct priv-mapping of certain guest resources (such as ioreq
> pages, used by emulators) by a tools domain, rather than having to access
> such resources via the guest P2M.
>
> This patch adds the necessary infrastructure to the privcmd driver and
> Xen MMU code to support direct resource mapping.
>
> NOTE: The adjustment in the MMU code is partially cosmetic. Xen will now
>       allow a PV tools domain to map guest pages either by GFN or MFN, thus
>       the term 'mfn' has been swapped for 'pfn' in the lower layers of the
>       remap code.
>
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>

I think this will have to wait until 4.18 though, it's somewhat late for
current merge window right now.

-boris