xen: expand BALLOON_MEMORY_HOTPLUG description

To mention it's also useful for PVH or HVM domains that require
mapping foreign memory or grants.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
---
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: xen-devel@lists.xenproject.org

diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 61212fc7f0c70427facc05ca7be59a74952e10ed..57ddd6f4b729b00a6e205aef3b8018d4cff316b6 100644 (file)
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -19,6 +19,10 @@ config XEN_BALLOON_MEMORY_HOTPLUG
          It is very useful on critical systems which require long
          run without rebooting.
 
+         It's also very useful for translated domains (PVH or HVM) to obtain
+         unpopulated physical memory ranges to use in order to map foreign
+         memory or grants.
+
          Memory could be hotplugged in following steps:
 
            1) target domain: ensure that memory auto online policy is in