xen: expand BALLOON_MEMORY_HOTPLUG description

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

[boris: "non PV" instead of "translated" at Juergen's request]

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Link: https://lore.kernel.org/r/20200324150015.50496-1-roger.pau@citrix.com
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 61212fc..ce024e5 100644 (file)
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -19,6 +19,9 @@ config XEN_BALLOON_MEMORY_HOTPLUG
          It is very useful on critical systems which require long
          run without rebooting.
 
+         It's also very useful for non PV domains 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