[PATCH 1/2] PV Hugetlb support - Hypervisor portion

[Dave McCracken <dcm@mccr.org>]

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On Thursday 24 July 2008, Dave McCracken wrote:
> Here is the hypervisor portion of hugetlb support for PV machines.

Oops.  Here's really the hypervisor portion.  The first one was a copy of the 
kernel portion.

Dave McCracken
Oracle Corp.


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--- xen-unstable/./xen/include/asm-x86/x86_32/page.h	2008-07-17 09:49:27.000000000 -0500
+++ xen-hpage/./xen/include/asm-x86/x86_32/page.h	2008-07-23 09:30:40.000000000 -0500
@@ -112,7 +112,7 @@ extern unsigned int PAGE_HYPERVISOR_NOCA
  * Disallow unused flag bits plus PAT/PSE, PCD, PWT and GLOBAL.
  * Permit the NX bit if the hardware supports it.
  */
-#define BASE_DISALLOW_MASK (0xFFFFF198U & ~_PAGE_NX)
+#define BASE_DISALLOW_MASK (0xFFFFF118U & ~_PAGE_NX)
 
 #define L1_DISALLOW_MASK (BASE_DISALLOW_MASK | _PAGE_GNTTAB)
 #define L2_DISALLOW_MASK (BASE_DISALLOW_MASK)
--- xen-unstable/./xen/include/asm-x86/x86_64/page.h	2008-07-17 09:49:27.000000000 -0500
+++ xen-hpage/./xen/include/asm-x86/x86_64/page.h	2008-07-23 09:30:40.000000000 -0500
@@ -109,7 +109,7 @@ typedef l4_pgentry_t root_pgentry_t;
  * Permit the NX bit if the hardware supports it.
  * Note that range [62:52] is available for software use on x86/64.
  */
-#define BASE_DISALLOW_MASK (0xFF800198U & ~_PAGE_NX)
+#define BASE_DISALLOW_MASK (0xFF800118U & ~_PAGE_NX)
 
 #define L1_DISALLOW_MASK (BASE_DISALLOW_MASK | _PAGE_GNTTAB)
 #define L2_DISALLOW_MASK (BASE_DISALLOW_MASK)
--- xen-unstable/./xen/arch/x86/mm.c	2008-07-17 09:49:27.000000000 -0500
+++ xen-hpage/./xen/arch/x86/mm.c	2008-07-23 09:30:40.000000000 -0500
@@ -755,6 +755,9 @@ get_page_from_l2e(
         MEM_LOG("Bad L2 flags %x", l2e_get_flags(l2e) & L2_DISALLOW_MASK);
         return 0;
     }
+    if ( l2e_get_flags(l2e) & _PAGE_PSE )
+        return 1;
+
 
     rc = get_page_and_type_from_pagenr(l2e_get_pfn(l2e), PGT_l1_page_table, d);
     if ( unlikely(!rc) )
@@ -948,6 +951,7 @@ void put_page_from_l1e(l1_pgentry_t l1e,
 static void put_page_from_l2e(l2_pgentry_t l2e, unsigned long pfn)
 {
     if ( (l2e_get_flags(l2e) & _PAGE_PRESENT) && 
+	 (!(l2e_get_flags(l2e) & _PAGE_PSE)) && 
          (l2e_get_pfn(l2e) != pfn) )
         put_page_and_type(l2e_get_page(l2e));
 }

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