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;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Juergen Gross <jgross@suse.com>
Subject: [PATCH 4.14 119/222] xen/balloon: Support xend-based toolstack
Date:   Sun, 11 Nov 2018 14:23:36 -0800
Message-Id: <20181111221658.366872342@linuxfoundation.org>
In-Reply-To: <20181111221647.665769131@linuxfoundation.org>
References: <20181111221647.665769131@linuxfoundation.org>
User-Agent: quilt/0.65
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Boris Ostrovsky <boris.ostrovsky@oracle.com>

commit 3aa6c19d2f38be9c6e9a8ad5fa8e3c9d29ee3c35 upstream.

Xend-based toolstacks don't have static-max entry in xenstore. The
equivalent node for those toolstacks is memory_static_max.

Fixes: 5266b8e4445c (xen: fix booting ballooned down hvm guest)
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: <stable@vger.kernel.org> # 4.13
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/xen/xen-balloon.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

--- a/drivers/xen/xen-balloon.c
+++ b/drivers/xen/xen-balloon.c
@@ -75,12 +75,15 @@ static void watch_target(struct xenbus_w
 
 	if (!watch_fired) {
 		watch_fired = true;
-		err = xenbus_scanf(XBT_NIL, "memory", "static-max", "%llu",
-				   &static_max);
-		if (err != 1)
-			static_max = new_target;
-		else
+
+		if ((xenbus_scanf(XBT_NIL, "memory", "static-max",
+				  "%llu", &static_max) == 1) ||
+		    (xenbus_scanf(XBT_NIL, "memory", "memory_static_max",
+				  "%llu", &static_max) == 1))
 			static_max >>= PAGE_SHIFT - 10;
+		else
+			static_max = new_target;
+
 		target_diff = (xen_pv_domain() || xen_initial_domain()) ? 0
 				: static_max - balloon_stats.target_pages;
 	}