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Re: [Xen-devel] [PATCH v3 3/9] xen/balloon: Share common memory reservation routines
- To: Oleksandr Andrushchenko <andr2000@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-media@xxxxxxxxxxxxxxx, jgross@xxxxxxxx, konrad.wilk@xxxxxxxxxx
- From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Date: Tue, 12 Jun 2018 21:07:59 -0400
- Cc: daniel.vetter@xxxxxxxxx, matthew.d.roper@xxxxxxxxx, dongwon.kim@xxxxxxxxx, Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
- Delivery-date: Wed, 13 Jun 2018 01:08:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06/12/2018 09:41 AM, Oleksandr Andrushchenko wrote:
One more thing: please add a comment here saying that frames array is
array of PFNs (in Xen granularity), which is what
XENMEM_populate_physmap requires. And remove (or update to name the
actual call you are making) the corresponding comment in
increase_reservation().
+
+int xenmem_reservation_increase(int count, xen_pfn_t *frames)
+{
+ struct xen_memory_reservation reservation = {
+ .address_bits = 0,
+ .extent_order = EXTENT_ORDER,
+ .domid = DOMID_SELF
+ };
+
+ set_xen_guest_handle(reservation.extent_start, frames);
+ reservation.nr_extents = count;
+ return HYPERVISOR_memory_op(XENMEM_populate_physmap, &reservation);
+}
+EXPORT_SYMBOL_GPL(xenmem_reservation_increase);
And similarly, here we are requesting GFNs, and update
decrease_reservation().
-boris
+
+int xenmem_reservation_decrease(int count, xen_pfn_t *frames)
+{
+ struct xen_memory_reservation reservation = {
+ .address_bits = 0,
+ .extent_order = EXTENT_ORDER,
+ .domid = DOMID_SELF
+ };
+
+ set_xen_guest_handle(reservation.extent_start, frames);
+ reservation.nr_extents = count;
+ return HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation);
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