[Xen-devel] [PATCH 6 of 7] Advertise resumability feature in guest kernel

[Brendan Cully <brendan@xxxxxxxxx>]

# HG changeset patch
# User Brendan Cully <brendan@xxxxxxxxx>
# Date 1168891374 28800
# Node ID 1a3b78919a43a68948775eb4077f5dab62054f7c
# Parent  dafb7b444c2ccf1d2ab9efb8c13d62e018713a85
Advertise resumability feature in guest kernel.
Disallow xm save -c unless the guest advertises that it is resumable.

Signed-off-by: Brendan Cully <brendan@xxxxxxxxx>

diff -r dafb7b444c2c -r 1a3b78919a43 
linux-2.6-xen-sparse/drivers/xen/core/reboot.c
--- a/linux-2.6-xen-sparse/drivers/xen/core/reboot.c    Mon Jan 15 12:02:54 
2007 -0800
+++ b/linux-2.6-xen-sparse/drivers/xen/core/reboot.c    Mon Jan 15 12:02:54 
2007 -0800
@@ -204,6 +204,8 @@ static int setup_shutdown_watcher(struct
        else
                xenbus_write(XBT_NIL, "control", "feature-sysrq", "1");
 
+       xenbus_write(XBT_NIL, "control", "feature-resumable", "1");
+
        return NOTIFY_DONE;
 }
 
diff -r dafb7b444c2c -r 1a3b78919a43 tools/python/xen/xend/XendDomain.py
--- a/tools/python/xen/xend/XendDomain.py       Mon Jan 15 12:02:54 2007 -0800
+++ b/tools/python/xen/xend/XendDomain.py       Mon Jan 15 12:02:54 2007 -0800
@@ -1196,6 +1196,10 @@ class XendDomain:
             if dominfo.getDomid() == DOM0_ID:
                 raise XendError("Cannot save privileged domain %i" % domid)
 
+            if checkpoint:
+                resumable = dominfo.readDom("control/feature-resumable")
+                if not resumable:
+                    raise XendError("Guest does not support checkpointing")
             fd = os.open(dst, os.O_WRONLY | os.O_CREAT | os.O_TRUNC)
             try:
                 XendCheckpoint.save(fd, dominfo, False, False, dst,

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