Re: [Xen-devel] [PATCHv4] xen/gntdev: add ioctl for grant copy

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 12/14/2015 09:21 AM, David Vrabel wrote:
> On 01/12/15 16:43, David Vrabel wrote:
> > Add IOCTL_GNTDEV_GRANT_COPY to allow applications to copy between user
> > space buffers and grant references.
> >
> > This interface is similar to the GNTTABOP_copy hypercall ABI except
> > the local buffers are provided using a virtual address (instead of a
> > GFN and offset).  To avoid userspace from having to page align its
> > buffers the driver will use two or more ops if required.
> >
> > If the ioctl returns 0, the application must check the status of each
> > segment with the segments status field.  If the ioctl returns a -ve
> > error code (EINVAL or EFAULT), the status of individual ops is
> > undefined.
> Konrad, Boris,  any comments?
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>

(You could use xen_offset_in_page(), which I didn't know existed)

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