[Xen-devel] [PATCH] Don't crash xen if hvm_read() from paged or shared memory

[Steven Hand <Steven.Hand@xxxxxxxxxxxx>]

There are two new return cases from hvm_copy_from_guest_virt() to deal
with paging or shared memory -- retry the emulation rather than crash.


Signed-off-by: Steven Hand <steven.hand@xxxxxxxxxxxx>

diff -r 25a3b799ff0e xen/arch/x86/mm/shadow/common.c
--- a/xen/arch/x86/mm/shadow/common.c   Thu Mar 25 11:38:46 2010 +0000
+++ b/xen/arch/x86/mm/shadow/common.c   Thu Mar 25 18:33:01 2010 +0000
@@ -180,6 +180,9 @@
     case HVMCOPY_bad_gfn_to_mfn:
     case HVMCOPY_unhandleable:
         return X86EMUL_UNHANDLEABLE;
+    case HVMCOPY_gfn_paged_out: 
+    case HVMCOPY_gfn_shared:
+        return X86EMUL_RETRY;
     }
 
     BUG();


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