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Re: [PATCH v4] tools/foreignmem: Support querying the size of a resource

On Thu, Jan 28, 2021 at 12:01:52PM +0000, Andrew Cooper wrote:
> With the Xen side of this interface (soon to be) fixed to return real sizes,
> userspace needs to be able to make the query.
> Introduce xenforeignmemory_resource_size() for the purpose, bumping the
> library minor version.
> Update both all osdep_xenforeignmemory_map_resource() implementations to
> understand size requests, skip the mmap() operation, and copy back the
> nr_frames field.
> For NetBSD, also fix up the ioctl() error path to issue an unmap(), which was
> overlooked by c/s 4a64e2bb39 "libs/foreignmemory: Implement on NetBSD".
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Acked-by: Wei Liu <wl@xxxxxxx>



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