[PATCH] MM: page allocation hooks for VMI backend

The VMI backend uses explicit page type notification to track shadow page
tables.  The allocation of page table roots is especially tricky.  We need to
clone the root for non-PAE mode while it is protected under the pgd lock to
correctly copy the shadow.

We don't need to allocate pgds in PAE mode, (PDPs in Intel terminology) as
they only have 4 entries, and are cached entirely by the processor, which
makes shadowing them rather simple.

For base page table level allocation, pmd_populate provides the exact hook
point we need.  Also, we need to allocate pages when splitting a large page,
and we must release pages before returning the page to any free pool.

Despite being required with these slightly odd semantics for VMI, Xen also
uses these hooks to determine the exact moment when page tables are created or
released.

AK: All nops for other architectures

Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>

2 files changed, 40 insertions, 4 deletions

diff --git a/include/asm-i386/paravirt.h b/include/asm-i386/paravirt.h
index 9f06265065f4..53da276a2ec2 100644
--- a/include/asm-i386/paravirt.h
+++ b/include/asm-i386/paravirt.h
@@ -127,6 +127,12 @@ struct paravirt_ops
         void (fastcall *flush_tlb_kernel)(void);
         void (fastcall *flush_tlb_single)(u32 addr);
 
+        void (fastcall *alloc_pt)(u32 pfn);
+        void (fastcall *alloc_pd)(u32 pfn);
+        void (fastcall *alloc_pd_clone)(u32 pfn, u32 clonepfn, u32 start, u32 count);
+        void (fastcall *release_pt)(u32 pfn);
+        void (fastcall *release_pd)(u32 pfn);
+
         void (fastcall *set_pte)(pte_t *ptep, pte_t pteval);
         void (fastcall *set_pte_at)(struct mm_struct *mm, u32 addr, pte_t *ptep, pte_t pteval);
         void (fastcall *set_pmd)(pmd_t *pmdp, pmd_t pmdval);
@@ -320,6 +326,14 @@ static inline unsigned long apic_read(unsigned long reg)
 #define __flush_tlb_global() paravirt_ops.flush_tlb_kernel()
 #define __flush_tlb_single(addr) paravirt_ops.flush_tlb_single(addr)
 
+#define paravirt_alloc_pt(pfn) paravirt_ops.alloc_pt(pfn)
+#define paravirt_release_pt(pfn) paravirt_ops.release_pt(pfn)
+
+#define paravirt_alloc_pd(pfn) paravirt_ops.alloc_pd(pfn)
+#define paravirt_alloc_pd_clone(pfn, clonepfn, start, count) \
+        paravirt_ops.alloc_pd_clone(pfn, clonepfn, start, count)
+#define paravirt_release_pd(pfn) paravirt_ops.release_pd(pfn)
+
 static inline void set_pte(pte_t *ptep, pte_t pteval)
 {
         paravirt_ops.set_pte(ptep, pteval);
diff --git a/include/asm-i386/pgalloc.h b/include/asm-i386/pgalloc.h
index 4b1e61359f89..c8dc2d0141a7 100644
--- a/include/asm-i386/pgalloc.h
+++ b/include/asm-i386/pgalloc.h
@@ -5,13 +5,31 @@
 #include <linux/threads.h>
 #include <linux/mm.h>           /* for struct page */
 
-#define pmd_populate_kernel(mm, pmd, pte) \
-                set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(pte)))
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+#define paravirt_alloc_pt(pfn) do { } while (0)
+#define paravirt_alloc_pd(pfn) do { } while (0)
+#define paravirt_alloc_pd(pfn) do { } while (0)
+#define paravirt_alloc_pd_clone(pfn, clonepfn, start, count) do { } while (0)
+#define paravirt_release_pt(pfn) do { } while (0)
+#define paravirt_release_pd(pfn) do { } while (0)
+#endif
+
+#define pmd_populate_kernel(mm, pmd, pte)                       \
+do {                                                            \
+        paravirt_alloc_pt(__pa(pte) >> PAGE_SHIFT);             \
+        set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(pte)));           \
+} while (0)
 
 #define pmd_populate(mm, pmd, pte)                              \
+do {                                                            \
+        paravirt_alloc_pt(page_to_pfn(pte));                    \
         set_pmd(pmd, __pmd(_PAGE_TABLE +                        \
                 ((unsigned long long)page_to_pfn(pte) <<        \
-                        (unsigned long long) PAGE_SHIFT)))
+                        (unsigned long long) PAGE_SHIFT)));     \
+} while (0)
+
 /*
  * Allocate and free page tables.
  */
@@ -32,7 +50,11 @@ static inline void pte_free(struct page *pte)
 }
 
 
-#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
+#define __pte_free_tlb(tlb,pte)                                         \
+do {                                                                    \
+        paravirt_release_pt(page_to_pfn(pte));                          \
+        tlb_remove_page((tlb),(pte));                                   \
+} while (0)
 
 #ifdef CONFIG_X86_PAE
 /*