[Xen-devel] [PATCH] xenpaging:close domU's event channel and free port

[hongkaixing@xxxxxxxxxx]

# HG changeset patch
# User h00166998@xxxxxxxxxxxxxxxxxxxxxxxxxx
# Date 1328777452 -28800
# Node ID 9f4640e40d4f31563885427a5a8d9eae2e110514
# Parent  8ba7ae0b070b4de93fc033067c61714c202d64c1
xenpaging:close domU's event channel and free port

Every domain (X86 64 bit)has 4096 event channels.In source code,
domU's event channel is allocated in mem_event_enable(),but just
unbind dom0's event channel in xenpaging_teardown().This bug will
result in that we can not use xenpaging after reopening it for 4096
times.We should free domU's event channel in mem_event_disable().so
that we can reuse the port.

Signed-off-by£ºhongkaixing<hongkaixing@xxxxxxxxxx>,shizhen<bicky.shi@xxxxxxxxxx>

diff -r 8ba7ae0b070b -r 9f4640e40d4f xen/arch/x86/mm/mem_event.c
--- a/xen/arch/x86/mm/mem_event.c       Tue Feb 07 18:46:50 2012 +0000
+++ b/xen/arch/x86/mm/mem_event.c       Thu Feb 09 16:50:52 2012 +0800
@@ -241,7 +241,12 @@
             mem_event_ring_unlock(med);
             return -EBUSY;
         }
-
+        
+        if( med->shared_page!=NULL )
+        {
+            free_xen_event_channel(d->vcpu[0], (med->shared_page)->port);
+        }
+             
         unmap_domain_page(med->ring_page);
         med->ring_page = NULL;
 

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