linux-kernel - [PATCH 1/2] xen: expand BALLOON_MEMORY

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Message-ID: <20200324150015.50496-1-roger.pau@citrix.com>
Date:   Tue, 24 Mar 2020 16:00:14 +0100
From:   Roger Pau Monne <roger.pau@...rix.com>
To:     <linux-kernel@...r.kernel.org>
CC:     Roger Pau Monne <roger.pau@...rix.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        "Stefano Stabellini" <sstabellini@...nel.org>,
        <xen-devel@...ts.xenproject.org>
Subject: [PATCH 1/2] 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@...rix.com>
---
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: Juergen Gross <jgross@...e.com>
Cc: Stefano Stabellini <sstabellini@...nel.org>
Cc: xen-devel@...ts.xenproject.org
---
 drivers/xen/Kconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 61212fc7f0c7..57ddd6f4b729 100644
--- 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
-- 
2.25.0