[Xen-changelog] Fix up #PF error code before propagating to guest kernel.

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

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID ccca12a2bee209dc50a6651c7ffc39a383a92dc0
# Parent  503c4d8454e5fa2d8cbc267dd2c8c0063cc5d613
Fix up #PF error code before propagating to guest kernel.

Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

diff -r 503c4d8454e5 -r ccca12a2bee2 xen/arch/x86/traps.c
--- a/xen/arch/x86/traps.c      Tue Mar  7 17:41:37 2006
+++ b/xen/arch/x86/traps.c      Wed Mar  8 09:33:31 2006
@@ -431,6 +431,11 @@
     v->arch.guest_context.ctrlreg[2] = addr;
     v->vcpu_info->arch.cr2           = addr;
 
+    /* Re-set error_code.user flag appropriately for the guest. */
+    error_code &= ~4;
+    if ( !KERNEL_MODE(v, guest_cpu_user_regs()) )
+        error_code |= 4;
+
     ti = &v->arch.guest_context.trap_ctxt[TRAP_page_fault];
     tb->flags = TBF_EXCEPTION | TBF_EXCEPTION_ERRCODE;
     tb->error_code = error_code;
@@ -541,7 +546,7 @@
  * #PF error code:
  *  Bit 0: Protection violation (=1) ; Page not present (=0)
  *  Bit 1: Write access
- *  Bit 2: Supervisor mode
+ *  Bit 2: User mode (=1) ; Supervisor mode (=0)
  *  Bit 3: Reserved bit violation
  *  Bit 4: Instruction fetch
  */

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog