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[Xen-changelog] When running test 5 in Memtest86+ v1.65, I got a "this o

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Subject: [Xen-changelog] When running test 5 in Memtest86+ v1.65, I got a "this opcode is not
From: Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>
Date: Tue, 11 Apr 2006 14:42:07 +0000
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# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 768b0f6696fd4672812625a284dfb9e8448ab429
# Parent  4c8311699685c0925fbd4415812a23ba4bffc66b
When running test 5 in Memtest86+ v1.65, I got a "this opcode is not
supported", so I decided to add it. It's a compare operation, and it's
just the opposite of the already supported one (opcode 0x39), so it's
nothing spectacular. Why there's a page-fault when this instruction gets
executed, I haven't got a clue, but I have a feeling that Memtest86 is
doing something wrong :-( However, this fix may help some other code to
run too...

With this, Test 5 passes all the way through without crashing. I did see
some occassional memory errors in some other tests, and I'm not 100%
sure whether those are caused by the system or they are "real" memory
errors. At some time in the future I may get round to memory testing my
target system...

Signed off by: Mats Petersson (mats.petersson@xxxxxxx).=20

diff -r 4c8311699685 -r 768b0f6696fd xen/arch/x86/hvm/platform.c
--- a/xen/arch/x86/hvm/platform.c       Tue Apr 11 09:40:03 2006
+++ b/xen/arch/x86/hvm/platform.c       Tue Apr 11 09:41:08 2006
@@ -401,6 +401,11 @@
         return reg_mem(instr->op_size, opcode, instr, rex);
+    case 0x3B: /* cmp m32/16, r32/16 */
+        instr->instr = INSTR_CMP;
+        GET_OP_SIZE_FOR_NONEBYTE(instr->op_size);
+        return mem_reg(instr->op_size, opcode, instr, rex);
     case 0x80:
     case 0x81:

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