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    Subject[PATCH 4.19 033/115] xen/balloon: fix ballooned page accounting without hotplug enabled
    Date
    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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