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xen/balloon: fix balloon initialization for PVH Dom0

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The current balloon code tries to calculate a delta factor for the
balloon target when running in HVM mode in order to account for memory
used by the firmware.

This workaround for memory accounting doesn't work properly on a PVH
Dom0, that has a static-max value different from the target value even
at startup. Note that this is not a problem for DomUs because guests are
started with a static-max value that matches the amount of RAM in the
memory map.

Fix this by forcefully setting target_diff for Dom0, regardless of
it's mode.

Reported-by: Gabriel Bercarug <bercarug@amazon.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Roger Pau Monne 2018-08-08 13:46:41 +02:00 committed by Boris Ostrovsky
parent cd9139220b
commit 3596924a23
1 changed files with 1 additions and 1 deletions
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2
drivers/xen/xen-balloon.c
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@ -81,7 +81,7 @@ static void watch_target(struct xenbus_watch *watch,
static_max = new_target;
else
static_max >>= PAGE_SHIFT - 10;
target_diff = xen_pv_domain() ? 0
target_diff = (xen_pv_domain() || xen_initial_domain()) ? 0
: static_max - balloon_stats.target_pages;
}