Re: Doamin crash when trying to install disk encryption (PointSec) on Windows HVM

[Keir Fraser <keir.fraser@eu.citrix.com>]

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On 22/04/2009 09:50, "Tom Rotenberg" <tom.rotenberg@gmail.com> wrote:

> AFAIK, the PointSec is trying to load his UI (which is probably coded in
> realmode) in this stage, and i guess that some of the instrctions he uses
> aren't emulated in Xen.
> 
> I am using xen-unstable, changeset: 19553 (from April 16), and the machione i
> am working on, is a Lenovo T500.
> 
> Can someone please help me with this, as i am not really familiar with the
> real mode emulation code?

We don't emulate LLDT at the moment. Try the attached patch.

 -- Keir


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diff -r cdc044f665dc xen/arch/x86/x86_emulate/x86_emulate.c
--- a/xen/arch/x86/x86_emulate/x86_emulate.c	Wed Apr 22 11:26:37 2009 +0100
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c	Wed Apr 22 11:52:15 2009 +0100
@@ -172,7 +172,7 @@
 
 static uint8_t twobyte_table[256] = {
     /* 0x00 - 0x07 */
-    0, ImplicitOps|ModRM, 0, 0, 0, 0, ImplicitOps, 0,
+    SrcMem16|ModRM, ImplicitOps|ModRM, 0, 0, 0, 0, ImplicitOps, 0,
     /* 0x08 - 0x0F */
     ImplicitOps, ImplicitOps, 0, 0, 0, ImplicitOps|ModRM, 0, 0,
     /* 0x10 - 0x17 */
@@ -3440,6 +3440,14 @@
  twobyte_insn:
     switch ( b )
     {
+    case 0x00: /* Grp6 */
+        fail_if((modrm_reg & 7) != 2);
+        generate_exception_if(!in_protmode(ctxt, ops), EXC_UD, -1);
+        generate_exception_if(!mode_ring0(), EXC_GP, 0);
+        if ( (rc = load_seg(x86_seg_ldtr, src.val, ctxt, ops)) != 0 )
+            goto done;
+        break;
+
     case 0x01: /* Grp7 */ {
         struct segment_register reg;
         unsigned long base, limit, cr0, cr0w;

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