[Xen-changelog] [xen-unstable] vmx:update DR6 on TRAP_debug VM exits.

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

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1223629609 -3600
# Node ID 583e45983aaa1855dc0b3e90634138a8880236f6
# Parent  c89fd1e9c49cc4b8dd72fa7cb30698a72b7adc93
vmx:update DR6 on TRAP_debug VM exits.

Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmx.c |    7 +++++++
 1 files changed, 7 insertions(+)

diff -r c89fd1e9c49c -r 583e45983aaa xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c        Fri Oct 10 10:04:58 2008 +0100
+++ b/xen/arch/x86/hvm/vmx/vmx.c        Fri Oct 10 10:06:49 2008 +0100
@@ -2109,6 +2109,13 @@ asmlinkage void vmx_vmexit_handler(struc
         switch ( vector )
         {
         case TRAP_debug:
+            /*
+             * Updates DR6 where debugger can peek (See 3B 23.2.1,
+             * Table 23-1, "Exit Qualification for Debug Exceptions").
+             */
+            exit_qualification = __vmread(EXIT_QUALIFICATION);
+            write_debugreg(6, exit_qualification | 0xffff0ff0);
+            /* fall through */
         case TRAP_int3:
             if ( !v->domain->debugger_attached )
                 goto exit_and_crash;

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