[Xen-devel] [PATCH][VT] make VMX guest 1:1 page table PGD page below 4G

["Li, Xin B" <xin.b.li@xxxxxxxxx>]

Like IA32 PAE xenlinux, we also need make VMX guest 1:1 page table PGD
page below 4G.

Signed-off-by: Xin Li <xin.b.li@xxxxxxxxx>
Signed-off-by: Chengyuan Li <chengyuan.li@xxxxxxxxx>
Signed-off-by: Yunhong Jiang <yunhong.jiang@xxxxxxxxx>
Signed-off-by: Jun Nakajima <jun.nakajima@xxxxxxxxx>

diff -r bd477fcd32ab tools/libxc/xc_vmx_build.c
--- a/tools/libxc/xc_vmx_build.c        Thu Sep 15 04:12:54 2005
+++ b/tools/libxc/xc_vmx_build.c        Thu Sep 15 15:04:09 2005
@@ -376,9 +376,21 @@
     if ( (mmu = xc_init_mmu_updates(xc_handle, dom)) == NULL )
         goto error_out;

+    /* First allocate page for page dir or pdpt */
+    ppt_alloc = (vpt_start - dsi.v_start) >> PAGE_SHIFT;
+    if ( page_array[ppt_alloc] > 0xfffff )
+    {
+       unsigned long nmfn;
+       nmfn = xc_make_page_below_4G( xc_handle, dom,
page_array[ppt_alloc] );
+       if ( nmfn == 0 )
+       {
+           fprintf(stderr, "Couldn't get a page below 4GB :-(\n");
+           goto error_out;
+       }
+       page_array[ppt_alloc] = nmfn;
+    }
+
 #ifdef __i386__
-    /* First allocate page for page dir. */
-    ppt_alloc = (vpt_start - dsi.v_start) >> PAGE_SHIFT;
     l2tab = page_array[ppt_alloc++] << PAGE_SHIFT;
     ctxt->ctrlreg[3] = l2tab;

@@ -414,8 +426,6 @@
     munmap(vl1tab, PAGE_SIZE);
     munmap(vl2tab, PAGE_SIZE);
 #else
-    /* First allocate pdpt */
-    ppt_alloc = (vpt_start - dsi.v_start) >> PAGE_SHIFT;
     /* here l3tab means pdpt, only 4 entry is used */
     l3tab = page_array[ppt_alloc++] << PAGE_SHIFT;
     ctxt->ctrlreg[3] = l3tab;

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