[Xen-changelog] [xen-3.2-testing] x86: add movnti emulation

["Xen patchbot-3.2-testing" <patchbot-3.2-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1224587183 -3600
# Node ID 3bac39661aa21b76f95860d74a9c4464768a5095
# Parent  0d59015f505d52de9c176db4114fac4e1618b700
x86: add movnti emulation

Linux added the use of movnti for copying from user to kernel space in
certain cases, and as per reports we got this may happen with the
destination being in MMIO.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
xen-unstable changeset:   18657:c4be040bef6faa4a1eae4ce71636cc1ae88a9f35
xen-unstable date:        Mon Oct 20 15:22:58 2008 +0100
---
 xen/arch/x86/x86_emulate.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletion(-)

diff -r 0d59015f505d -r 3bac39661aa2 xen/arch/x86/x86_emulate.c
--- a/xen/arch/x86/x86_emulate.c        Thu Oct 16 18:55:05 2008 +0100
+++ b/xen/arch/x86/x86_emulate.c        Tue Oct 21 12:06:23 2008 +0100
@@ -244,7 +244,8 @@ static uint8_t twobyte_table[256] = {
     DstReg|SrcMem|ModRM, DstReg|SrcMem|ModRM,
     ByteOp|DstReg|SrcMem|ModRM|Mov, DstReg|SrcMem16|ModRM|Mov,
     /* 0xC0 - 0xC7 */
-    ByteOp|DstMem|SrcReg|ModRM, DstMem|SrcReg|ModRM, 0, 0,
+    ByteOp|DstMem|SrcReg|ModRM, DstMem|SrcReg|ModRM,
+    0, DstMem|SrcReg|ModRM|Mov,
     0, 0, 0, ImplicitOps|ModRM,
     /* 0xC8 - 0xCF */
     ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
@@ -3339,6 +3340,12 @@ x86_emulate(
         src.val = x86_seg_gs;
         goto pop_seg;
 
+    case 0xc3: /* movnti */
+        /* Ignore the non-temporal hint for now. */
+        generate_exception_if(dst.bytes <= 2, EXC_UD);
+        dst.val = src.val;
+        break;
+
     case 0xc7: /* Grp9 (cmpxchg8b) */
 #if defined(__i386__)
     {

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