Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Received-SPF: None (esa4.hc3370-68.iphmx.com: no sender
  authenticity information available from domain of
  roger.pau@citrix.com) identity=pra; client-ip=162.221.158.21;
  receiver=esa4.hc3370-68.iphmx.com;
  envelope-from="roger.pau@citrix.com";
  x-sender="roger.pau@citrix.com";
  x-conformance=sidf_compatible
Received-SPF: Pass (esa4.hc3370-68.iphmx.com: domain of
  roger.pau@citrix.com designates 162.221.158.21 as permitted
  sender) identity=mailfrom; client-ip=162.221.158.21;
  receiver=esa4.hc3370-68.iphmx.com;
  envelope-from="roger.pau@citrix.com";
  x-sender="roger.pau@citrix.com";
  x-conformance=sidf_compatible; x-record-type="v=spf1";
  x-record-text="v=spf1 ip4:209.167.231.154 ip4:178.63.86.133
  ip4:195.66.111.40/30 ip4:85.115.9.32/28 ip4:199.102.83.4
  ip4:192.28.146.160 ip4:192.28.146.107 ip4:216.52.6.88
  ip4:216.52.6.188 ip4:162.221.158.21 ip4:162.221.156.83
  ip4:168.245.78.127 ~all"
Received-SPF: None (esa4.hc3370-68.iphmx.com: no sender
  authenticity information available from domain of
  postmaster@mail.citrix.com) identity=helo;
  client-ip=162.221.158.21; receiver=esa4.hc3370-68.iphmx.com;
  envelope-from="roger.pau@citrix.com";
  x-sender="postmaster@mail.citrix.com";
  x-conformance=sidf_compatible
IronPort-SDR: 229YkSUPjTs2vF4LrHxAgXY+0/Cxpb0vjzrzH+SAqyCmieLe/OXnOTr2iYuhQQYLYQGzbEhzZ2
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 s+s=
From:   Roger Pau Monne <roger.pau@citrix.com>
To:     <linux-kernel@vger.kernel.org>
CC:     Roger Pau Monne <roger.pau@citrix.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Juergen Gross <jgross@suse.com>,
        "Stefano Stabellini" <sstabellini@kernel.org>,
        <xen-devel@lists.xenproject.org>
Subject: [PATCH 1/2] xen: expand BALLOON_MEMORY_HOTPLUG description
Date:   Tue, 24 Mar 2020 16:00:14 +0100
Message-ID: <20200324150015.50496-1-roger.pau@citrix.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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
---
 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