From: Keir Fraser <keir.fraser@citrix.com>
Date: Fri, 20 Mar 2009 08:43:53 +0000 (+0000)
Subject: fs-back: unmapp all shared ring pages when a domain dies
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~13992^2~21
X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https://%22%22/%22http:/www.example.com/cgi/%22https:/%22%22?a=commitdiff_plain;h=9c2e145d6843e65679b47c449af2737a9054ba03;p=xen.git

fs-back: unmapp all shared ring pages when a domain dies

This bug causes some pages not to be properly freed by xen, hence
after a cycle of 50 save\restore we don't have enough spare memory to
start 2 VMs any more. This patch fixes the issue properly unmapping
all the pages needed by the shared ring.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---

diff --git a/tools/fs-back/fs-backend.c b/tools/fs-back/fs-backend.c
index 7dc36f2699..721b2dc0a5 100644
--- a/tools/fs-back/fs-backend.c
+++ b/tools/fs-back/fs-backend.c
@@ -161,7 +161,7 @@ static void terminate_mount_request(struct fs_mount *mount) {
     while (!xenbus_frontend_state_changed(mount, STATE_CLOSING));
     xenbus_write_backend_state(mount, STATE_CLOSED);
 
-    xc_gnttab_munmap(mount->gnth, mount->ring.sring, 1);
+    xc_gnttab_munmap(mount->gnth, mount->ring.sring, mount->shared_ring_size);
     xc_gnttab_close(mount->gnth);
     xc_evtchn_unbind(mount->evth, mount->local_evtchn);
     xc_evtchn_close(mount->evth);