File balloon-fullmem.diff of Package xen_uvp

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=c275a57f5ec3056f732843b11659d892235faff7

xen/balloon: Set balloon's initial state to number of existing RAM pages
Currently balloon's initial value is set to max_pfn which includes
non-RAM ranges such as MMIO hole. As result, initial memory target
(specified by guest's configuration file) will appear smaller than
what balloon driver perceives to be the current number of available
pages. Thus it will balloon down "extra" pages, decreasing amount of
available memory for no good reason.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
--- linux-4.1/drivers/xen/balloon.c.orig	2016-12-09 16:56:17.000000000 +0100
+++ linux-4.1/drivers/xen/balloon.c	2017-04-05 08:06:02.798042857 +0200
@@ -653,7 +653,7 @@ static int __init balloon_init(void)
 
 	balloon_stats.current_pages = xen_pv_domain()
 		? min(xen_start_info->nr_pages - xen_released_pages, max_pfn)
-		: max_pfn;
+		: get_num_physpages();
 	balloon_stats.target_pages  = balloon_stats.current_pages;
 	balloon_stats.balloon_low   = 0;
 	balloon_stats.balloon_high  = 0;