Re: [Xen-devel] [PATCH v4 1/2] Interface for grant copy operation in libs.

[Paulina Szubarczyk <paulinaszubarczyk@xxxxxxxxx>]

On 08/04/2016 11:38 AM, Wei Liu wrote:
> The code looks ok. I have two minor suggestions below.
>
> I would suggest changing the subject line to:
>
>    libs/gnttab: introduce grant copy interface
>
> On Tue, Aug 02, 2016 at 04:06:29PM +0200, Paulina Szubarczyk wrote:
> > In a linux part an ioctl(gntdev, IOCTL_GNTDEV_GRANT_COPY, ..)
> > system call is invoked. In mini-os the operation is yet not
> > implemented. For the OSs that does not implement gnttab the
> > call of the grant copy operation causes abort.
> >
> > Signed-off-by: Paulina Szubarczyk <paulinaszubarczyk@xxxxxxxxx>
> > ---
> > Changes since v3:
> > - revert to cast from xengnttab_grant_copy_segment_t
> >    to ioctl_gntdev_grant_copy.
> > - added compile-time check to compare the libs
> >    xengnttab_grant_copy_segment_t with the ioctl structure.
> >    The patch relies on Wei patch introducing XENGNTTAB_BUILD_BUG_ON
> >    in libs/gnttab.
> I should resubmit that one soon.
>
> > ---
> [...]
> > +    rc = ioctl(fd, IOCTL_GNTDEV_GRANT_COPY, &copy);
> > +    if (rc)
> > +    {
> > +        GTERROR(xgt->logger, "ioctl GRANT COPY failed %d ", errno);
> > +    }
> Normally for a single statement you don't need {} around it.
>
> No need to resubmit just because of this patch. I can handle the subject
> line change,  fix up the style issue and change the comment according to
> David's suggestion while committing if you don't object to any of them.
Ok, thank you.

> I won't commit this patch right away though. I will wait until the QEMU
> patch is acked because I would avoid committing things that have no
> users.
>
> If you end up submitting another version you can make those changes
> yourself.
>
>
> Wei.
Paulina

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