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    Subject[PATCH 4.14 063/115] xen/balloon: fix balloon initialization for PVH Dom0
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Roger Pau Monne <roger.pau@citrix.com>

    [ Upstream commit 3596924a233e45aa918c961a902170fc4916461b ]

    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>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/xen/xen-balloon.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/xen/xen-balloon.c
    +++ b/drivers/xen/xen-balloon.c
    @@ -81,7 +81,7 @@ static void watch_target(struct xenbus_w
    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;
    }


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