add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/xen/xen-balloon.c
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@@ -37,6 +37,7 @@
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 #include <linux/mm_types.h>
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 #include <linux/init.h>
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 #include <linux/capability.h>
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+#include <linux/memory_hotplug.h>
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 #include <xen/xen.h>
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 #include <xen/interface/xen.h>
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@@ -50,6 +51,10 @@
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 #define BALLOON_CLASS_NAME "xen_memory"
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+#ifdef CONFIG_MEMORY_HOTPLUG
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+u64 xen_saved_max_mem_size = 0;
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+#endif
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+
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 static struct device balloon_dev;
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 static int register_balloon(struct device *dev);
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@@ -62,6 +67,12 @@
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 	int err;
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 	static bool watch_fired;
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 	static long target_diff;
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+
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+#ifdef CONFIG_MEMORY_HOTPLUG
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+	/* The balloon driver will take care of adding memory now. */
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+	if (xen_saved_max_mem_size)
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+		max_mem_size = xen_saved_max_mem_size;
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+#endif
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 	err = xenbus_scanf(XBT_NIL, "memory", "target", "%llu", &new_target);
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 	if (err != 1) {
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@@ -117,8 +128,6 @@
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 void xen_balloon_init(void)
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 {
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 	register_balloon(&balloon_dev);
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-
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-	register_xen_selfballooning(&balloon_dev);
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 	register_xenstore_notifier(&xenstore_notifier);
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 }