Steven Hand
2010-Mar-25 18:44 UTC
[Xen-devel] [PATCH] Don''t crash xen if hvm_read() from paged or shared memory
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@cl.cam.ac.uk>
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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