[Xen-changelog] [xen-unstable] x86: add movnti emulation

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

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1224512578 -3600
# Node ID c4be040bef6faa4a1eae4ce71636cc1ae88a9f35
# Parent  2a25fd94c6f207d5b9066a1d765697a5a680fc42
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/arch/x86/x86_emulate/x86_emulate.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletion(-)

diff -r 2a25fd94c6f2 -r c4be040bef6f xen/arch/x86/x86_emulate/x86_emulate.c
--- a/xen/arch/x86/x86_emulate/x86_emulate.c    Mon Oct 20 15:19:39 2008 +0100
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c    Mon Oct 20 15:22:58 2008 +0100
@@ -236,7 +236,8 @@ 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,
@@ -3910,6 +3911,12 @@ x86_emulate(
         }
         goto add;
 
+    case 0xc3: /* movnti */
+        /* Ignore the non-temporal hint for now. */
+        generate_exception_if(dst.bytes <= 2, EXC_UD, -1);
+        dst.val = src.val;
+        break;
+
     case 0xc7: /* Grp9 (cmpxchg8b/cmpxchg16b) */ {
         unsigned long old[2], exp[2], new[2];
         unsigned int i;

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