xc_ptrace fix

[Kip Macy <kip.macy@gmail.com>]

Make work for paravirtualized guest

# This is a BitKeeper generated diff -Nru style patch.
#
# ChangeSet
#   2005/04/28 15:22:26-07:00 kmacy@curly.lab.netapp.com 
#   Fix xc_ptrace
#   Signed-off-by: Kip Macy <kmacy@fsmware.com>
# 
# BitKeeper/etc/logging_ok
#   2005/04/28 15:22:26-07:00 kmacy@curly.lab.netapp.com +1 -0
#   Logging to logging@openlogging.org accepted
# 
# tools/libxc/xc_ptrace.c
#   2005/04/28 15:22:15-07:00 kmacy@curly.lab.netapp.com +4 -2
#   don't reference page_array in the paravirtualized case
# 
diff -Nru a/tools/libxc/xc_ptrace.c b/tools/libxc/xc_ptrace.c
--- a/tools/libxc/xc_ptrace.c   2005-04-27 19:11:24 -07:00
+++ b/tools/libxc/xc_ptrace.c   2005-04-27 19:11:24 -07:00
@@ -181,7 +181,8 @@
     } 
     if ((pde = cr3_virt[cpu][vtopdi(va)]) == 0) /* logical address */
        goto error_out;
-    pde = page_array[pde >> PAGE_SHIFT] << PAGE_SHIFT;
+    if (ctxt[cpu].flags & VGCF_VMX_GUEST)
+       pde = page_array[pde >> PAGE_SHIFT] << PAGE_SHIFT;
     if (pde != pde_phys[cpu]) 
     {
        pde_phys[cpu] = pde;
@@ -194,7 +195,8 @@
     }
     if ((page = pde_virt[cpu][vtopti(va)]) == 0) /* logical address */
        goto error_out;
-    page = page_array[page >> PAGE_SHIFT] << PAGE_SHIFT;
+    if (ctxt[cpu].flags & VGCF_VMX_GUEST)
+       page = page_array[page >> PAGE_SHIFT] << PAGE_SHIFT;
     if (page != page_phys[cpu] || perm != prev_perm[cpu]) 
     {
        page_phys[cpu] = page;