| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 033/115] xen/balloon: fix ballooned page accounting without hotplug enabled | Date | Tue, 7 Jan 2020 21:54:03 +0100 |
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From: Juergen Gross <jgross@suse.com>
[ Upstream commit c673ec61ade89bf2f417960f986bc25671762efb ]
When CONFIG_XEN_BALLOON_MEMORY_HOTPLUG is not defined reserve_additional_memory() will set balloon_stats.target_pages to a wrong value in case there are still some ballooned pages allocated via alloc_xenballooned_pages().
This will result in balloon_process() no longer be triggered when ballooned pages are freed in batches.
Reported-by: Nicholas Tsirakis <niko.tsirakis@gmail.com> Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/xen/balloon.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index 747a15acbce3..6fa7209f24f4 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -395,7 +395,8 @@ static struct notifier_block xen_memory_nb = { #else static enum bp_state reserve_additional_memory(void) { - balloon_stats.target_pages = balloon_stats.current_pages; + balloon_stats.target_pages = balloon_stats.current_pages + + balloon_stats.target_unpopulated; return BP_ECANCELED; } #endif /* CONFIG_XEN_BALLOON_MEMORY_HOTPLUG */ -- 2.20.1
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