[Xen-changelog] [xen-unstable] shadow: Don't crash xen if hvm_read() from paged or shared memory

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1269593288 0
# Node ID 19cc497863a442c8d23e77fb2f1b201651687aa2
# Parent  17fa3cd04361ca7e4bc3e000b67fb4187e5d21b5
shadow: 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@xxxxxxxxxxxx>
---
 xen/arch/x86/mm/shadow/common.c |    3 +++
 1 files changed, 3 insertions(+)

diff -r 17fa3cd04361 -r 19cc497863a4 xen/arch/x86/mm/shadow/common.c
--- a/xen/arch/x86/mm/shadow/common.c   Fri Mar 26 08:45:45 2010 +0000
+++ b/xen/arch/x86/mm/shadow/common.c   Fri Mar 26 08:48:08 2010 +0000
@@ -180,6 +180,9 @@ hvm_read(enum x86_segment seg,
     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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