[PATCH] i386: PARAVIRT: Add pagetable accessors to pack and unpack pagetable entries

Add a set of accessors to pack, unpack and modify page table entries
(at all levels).  This allows a paravirt implementation to control the
contents of pgd/pmd/pte entries.  For example, Xen uses this to
convert the (pseudo-)physical address into a machine address when
populating a pagetable entry, and converting back to pphys address
when an entry is read.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Ingo Molnar <mingo@elte.hu>

5 files changed, 169 insertions, 53 deletions

diff --git a/include/asm-i386/page.h b/include/asm-i386/page.h
index fd3f64ace24..818ac8bf01e 100644
--- a/include/asm-i386/page.h
+++ b/include/asm-i386/page.h
@@ -12,7 +12,6 @@
 #ifdef __KERNEL__
 #ifndef __ASSEMBLY__
 
-
 #ifdef CONFIG_X86_USE_3DNOW
 
 #include <asm/mmx.h>
@@ -42,26 +41,81 @@
  * These are used to make use of C type-checking..
  */
 extern int nx_enabled;
+
 #ifdef CONFIG_X86_PAE
 extern unsigned long long __supported_pte_mask;
 typedef struct { unsigned long pte_low, pte_high; } pte_t;
 typedef struct { unsigned long long pmd; } pmd_t;
 typedef struct { unsigned long long pgd; } pgd_t;
 typedef struct { unsigned long long pgprot; } pgprot_t;
-#define pmd_val(x)      ((x).pmd)
-#define pte_val(x)      ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
-#define __pmd(x) ((pmd_t) { (x) } )
+
+static inline unsigned long long native_pgd_val(pgd_t pgd)
+{
+        return pgd.pgd;
+}
+
+static inline unsigned long long native_pmd_val(pmd_t pmd)
+{
+        return pmd.pmd;
+}
+
+static inline unsigned long long native_pte_val(pte_t pte)
+{
+        return pte.pte_low | ((unsigned long long)pte.pte_high << 32);
+}
+
+static inline pgd_t native_make_pgd(unsigned long long val)
+{
+        return (pgd_t) { val };
+}
+
+static inline pmd_t native_make_pmd(unsigned long long val)
+{
+        return (pmd_t) { val };
+}
+
+static inline pte_t native_make_pte(unsigned long long val)
+{
+        return (pte_t) { .pte_low = val, .pte_high = (val >> 32) } ;
+}
+
+#ifndef CONFIG_PARAVIRT
+#define pmd_val(x)      native_pmd_val(x)
+#define __pmd(x)        native_make_pmd(x)
+#endif
+
 #define HPAGE_SHIFT     21
 #include <asm-generic/pgtable-nopud.h>
-#else
+#else  /* !CONFIG_X86_PAE */
 typedef struct { unsigned long pte_low; } pte_t;
 typedef struct { unsigned long pgd; } pgd_t;
 typedef struct { unsigned long pgprot; } pgprot_t;
 #define boot_pte_t pte_t /* or would you rather have a typedef */
-#define pte_val(x)      ((x).pte_low)
+
+static inline unsigned long native_pgd_val(pgd_t pgd)
+{
+        return pgd.pgd;
+}
+
+static inline unsigned long native_pte_val(pte_t pte)
+{
+        return pte.pte_low;
+}
+
+static inline pgd_t native_make_pgd(unsigned long val)
+{
+        return (pgd_t) { val };
+}
+
+static inline pte_t native_make_pte(unsigned long val)
+{
+        return (pte_t) { .pte_low = val };
+}
+
 #define HPAGE_SHIFT     22
 #include <asm-generic/pgtable-nopmd.h>
-#endif
+#endif  /* CONFIG_X86_PAE */
+
 #define PTE_MASK        PAGE_MASK
 
 #ifdef CONFIG_HUGETLB_PAGE
@@ -71,13 +125,16 @@ typedef struct { unsigned long pgprot; } pgprot_t;
 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 #endif
 
-#define pgd_val(x)      ((x).pgd)
 #define pgprot_val(x)   ((x).pgprot)
-
-#define __pte(x) ((pte_t) { (x) } )
-#define __pgd(x) ((pgd_t) { (x) } )
 #define __pgprot(x)     ((pgprot_t) { (x) } )
 
+#ifndef CONFIG_PARAVIRT
+#define pgd_val(x)      native_pgd_val(x)
+#define __pgd(x)        native_make_pgd(x)
+#define pte_val(x)      native_pte_val(x)
+#define __pte(x)        native_make_pte(x)
+#endif
+
 #endif /* !__ASSEMBLY__ */
 
 /* to align the pointer to the (next) page boundary */
diff --git a/include/asm-i386/paravirt.h b/include/asm-i386/paravirt.h
index f0bdaea6235..0aacb13bb92 100644
--- a/include/asm-i386/paravirt.h
+++ b/include/asm-i386/paravirt.h
@@ -2,7 +2,6 @@
 #define __ASM_PARAVIRT_H
 /* Various instructions on x86 need to be replaced for
  * para-virtualization: those hooks are defined here. */
-#include <linux/linkage.h>
 #include <linux/stringify.h>
 #include <asm/page.h>
 
@@ -25,6 +24,8 @@
 #define CLBR_ANY 0x7
 
 #ifndef __ASSEMBLY__
+#include <linux/types.h>
+
 struct thread_struct;
 struct Xgt_desc_struct;
 struct tss_struct;
@@ -55,11 +56,6 @@ struct paravirt_ops
         int (*set_wallclock)(unsigned long);
         void (*time_init)(void);
 
-        /* All the function pointers here are declared as "fastcall"
-           so that we get a specific register-based calling
-           convention.  This makes it easier to implement inline
-           assembler replacements. */
-
         void (*cpuid)(unsigned int *eax, unsigned int *ebx,
                       unsigned int *ecx, unsigned int *edx);
 
@@ -139,16 +135,33 @@ struct paravirt_ops
         void (*release_pd)(u32 pfn);
 
         void (*set_pte)(pte_t *ptep, pte_t pteval);
-        void (*set_pte_at)(struct mm_struct *mm, u32 addr, pte_t *ptep, pte_t pteval);
+        void (*set_pte_at)(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pteval);
         void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
-        void (*pte_update)(struct mm_struct *mm, u32 addr, pte_t *ptep);
-        void (*pte_update_defer)(struct mm_struct *mm, u32 addr, pte_t *ptep);
+        void (*pte_update)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
+        void (*pte_update_defer)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
+
+        pte_t (*ptep_get_and_clear)(pte_t *ptep);
+
 #ifdef CONFIG_X86_PAE
         void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
-        void (*set_pte_present)(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte);
+        void (*set_pte_present)(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte);
         void (*set_pud)(pud_t *pudp, pud_t pudval);
-        void (*pte_clear)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
+        void (*pte_clear)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
         void (*pmd_clear)(pmd_t *pmdp);
+
+        unsigned long long (*pte_val)(pte_t);
+        unsigned long long (*pmd_val)(pmd_t);
+        unsigned long long (*pgd_val)(pgd_t);
+
+        pte_t (*make_pte)(unsigned long long pte);
+        pmd_t (*make_pmd)(unsigned long long pmd);
+        pgd_t (*make_pgd)(unsigned long long pgd);
+#else
+        unsigned long (*pte_val)(pte_t);
+        unsigned long (*pgd_val)(pgd_t);
+
+        pte_t (*make_pte)(unsigned long pte);
+        pgd_t (*make_pgd)(unsigned long pgd);
 #endif
 
         void (*set_lazy_mode)(int mode);
@@ -219,6 +232,8 @@ static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
 #define read_cr4_safe(x) paravirt_ops.read_cr4_safe()
 #define write_cr4(x) paravirt_ops.write_cr4(x)
 
+#define raw_ptep_get_and_clear(xp)      (paravirt_ops.ptep_get_and_clear(xp))
+
 static inline void raw_safe_halt(void)
 {
         paravirt_ops.safe_halt();
@@ -304,6 +319,17 @@ static inline void halt(void)
         (paravirt_ops.write_idt_entry((dt), (entry), (low), (high)))
 #define set_iopl_mask(mask) (paravirt_ops.set_iopl_mask(mask))
 
+#define __pte(x)        paravirt_ops.make_pte(x)
+#define __pgd(x)        paravirt_ops.make_pgd(x)
+
+#define pte_val(x)      paravirt_ops.pte_val(x)
+#define pgd_val(x)      paravirt_ops.pgd_val(x)
+
+#ifdef CONFIG_X86_PAE
+#define __pmd(x)        paravirt_ops.make_pmd(x)
+#define pmd_val(x)      paravirt_ops.pmd_val(x)
+#endif
+
 /* The paravirtualized I/O functions */
 static inline void slow_down_io(void) {
         paravirt_ops.io_delay();
@@ -344,6 +370,7 @@ static inline void setup_secondary_clock(void)
 }
 #endif
 
+
 #ifdef CONFIG_SMP
 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
                                     unsigned long start_esp)
@@ -371,7 +398,8 @@ static inline void set_pte(pte_t *ptep, pte_t pteval)
         paravirt_ops.set_pte(ptep, pteval);
 }
 
-static inline void set_pte_at(struct mm_struct *mm, u32 addr, pte_t *ptep, pte_t pteval)
+static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
+                              pte_t *ptep, pte_t pteval)
 {
         paravirt_ops.set_pte_at(mm, addr, ptep, pteval);
 }
diff --git a/include/asm-i386/pgtable-2level.h b/include/asm-i386/pgtable-2level.h
index 38c3fcc0676..043a2bcfa86 100644
--- a/include/asm-i386/pgtable-2level.h
+++ b/include/asm-i386/pgtable-2level.h
@@ -11,10 +11,23 @@
  * within a page table are directly modified.  Thus, the following
  * hook is made available.
  */
+static inline void native_set_pte(pte_t *ptep , pte_t pte)
+{
+        *ptep = pte;
+}
+static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
+                                     pte_t *ptep , pte_t pte)
+{
+        native_set_pte(ptep, pte);
+}
+static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
+{
+        *pmdp = pmd;
+}
 #ifndef CONFIG_PARAVIRT
-#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
-#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
-#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
+#define set_pte(pteptr, pteval)         native_set_pte(pteptr, pteval)
+#define set_pte_at(mm,addr,ptep,pteval) native_set_pte_at(mm, addr, ptep, pteval)
+#define set_pmd(pmdptr, pmdval)         native_set_pmd(pmdptr, pmdval)
 #endif
 
 #define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval)
@@ -23,11 +36,14 @@
 #define pte_clear(mm,addr,xp)   do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 #define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
 
-#define raw_ptep_get_and_clear(xp)      __pte(xchg(&(xp)->pte_low, 0))
+static inline pte_t native_ptep_get_and_clear(pte_t *xp)
+{
+        return __pte(xchg(&xp->pte_low, 0));
+}
 
 #define pte_page(x)             pfn_to_page(pte_pfn(x))
 #define pte_none(x)             (!(x).pte_low)
-#define pte_pfn(x)              ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
+#define pte_pfn(x)              (pte_val(x) >> PAGE_SHIFT)
 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 #define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 
diff --git a/include/asm-i386/pgtable-3level.h b/include/asm-i386/pgtable-3level.h
index 7a2318f3830..be6017f37a9 100644
--- a/include/asm-i386/pgtable-3level.h
+++ b/include/asm-i386/pgtable-3level.h
@@ -42,20 +42,23 @@ static inline int pte_exec_kernel(pte_t pte)
         return pte_x(pte);
 }
 
-#ifndef CONFIG_PARAVIRT
 /* Rules for using set_pte: the pte being assigned *must* be
  * either not present or in a state where the hardware will
  * not attempt to update the pte.  In places where this is
  * not possible, use pte_get_and_clear to obtain the old pte
  * value and then use set_pte to update it.  -ben
  */
-static inline void set_pte(pte_t *ptep, pte_t pte)
+static inline void native_set_pte(pte_t *ptep, pte_t pte)
 {
         ptep->pte_high = pte.pte_high;
         smp_wmb();
         ptep->pte_low = pte.pte_low;
 }
-#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
+                                     pte_t *ptep , pte_t pte)
+{
+        native_set_pte(ptep, pte);
+}
 
 /*
  * Since this is only called on user PTEs, and the page fault handler
@@ -63,7 +66,8 @@ static inline void set_pte(pte_t *ptep, pte_t pte)
  * we are justified in merely clearing the PTE present bit, followed
  * by a set.  The ordering here is important.
  */
-static inline void set_pte_present(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
+static inline void native_set_pte_present(struct mm_struct *mm, unsigned long addr,
+                                          pte_t *ptep, pte_t pte)
 {
         ptep->pte_low = 0;
         smp_wmb();
@@ -72,32 +76,48 @@ static inline void set_pte_present(struct mm_struct *mm, unsigned long addr, pte
         ptep->pte_low = pte.pte_low;
 }
 
-#define set_pte_atomic(pteptr,pteval) \
-                set_64bit((unsigned long long *)(pteptr),pte_val(pteval))
-#define set_pmd(pmdptr,pmdval) \
-                set_64bit((unsigned long long *)(pmdptr),pmd_val(pmdval))
-#define set_pud(pudptr,pudval) \
-                (*(pudptr) = (pudval))
+static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
+{
+        set_64bit((unsigned long long *)(ptep),native_pte_val(pte));
+}
+static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
+{
+        set_64bit((unsigned long long *)(pmdp),native_pmd_val(pmd));
+}
+static inline void native_set_pud(pud_t *pudp, pud_t pud)
+{
+        *pudp = pud;
+}
 
 /*
  * For PTEs and PDEs, we must clear the P-bit first when clearing a page table
  * entry, so clear the bottom half first and enforce ordering with a compiler
  * barrier.
  */
-static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 {
         ptep->pte_low = 0;
         smp_wmb();
         ptep->pte_high = 0;
 }
 
-static inline void pmd_clear(pmd_t *pmd)
+static inline void native_pmd_clear(pmd_t *pmd)
 {
         u32 *tmp = (u32 *)pmd;
         *tmp = 0;
         smp_wmb();
         *(tmp + 1) = 0;
 }
+
+#ifndef CONFIG_PARAVIRT
+#define set_pte(ptep, pte)                      native_set_pte(ptep, pte)
+#define set_pte_at(mm, addr, ptep, pte)         native_set_pte_at(mm, addr, ptep, pte)
+#define set_pte_present(mm, addr, ptep, pte)    native_set_pte_present(mm, addr, ptep, pte)
+#define set_pte_atomic(ptep, pte)               native_set_pte_atomic(ptep, pte)
+#define set_pmd(pmdp, pmd)                      native_set_pmd(pmdp, pmd)
+#define set_pud(pudp, pud)                      native_set_pud(pudp, pud)
+#define pte_clear(mm, addr, ptep)               native_pte_clear(mm, addr, ptep)
+#define pmd_clear(pmd)                          native_pmd_clear(pmd)
 #endif
 
 /*
@@ -119,7 +139,7 @@ static inline void pud_clear (pud_t * pud) { }
 #define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
                         pmd_index(address))
 
-static inline pte_t raw_ptep_get_and_clear(pte_t *ptep)
+static inline pte_t native_ptep_get_and_clear(pte_t *ptep)
 {
         pte_t res;
 
@@ -146,28 +166,21 @@ static inline int pte_none(pte_t pte)
 
 static inline unsigned long pte_pfn(pte_t pte)
 {
-        return (pte.pte_low >> PAGE_SHIFT) |
-                (pte.pte_high << (32 - PAGE_SHIFT));
+        return pte_val(pte) >> PAGE_SHIFT;
 }
 
 extern unsigned long long __supported_pte_mask;
 
 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 {
-        pte_t pte;
-
-        pte.pte_high = (page_nr >> (32 - PAGE_SHIFT)) | \
-                                        (pgprot_val(pgprot) >> 32);
-        pte.pte_high &= (__supported_pte_mask >> 32);
-        pte.pte_low = ((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)) & \
-                                                        __supported_pte_mask;
-        return pte;
+        return __pte((((unsigned long long)page_nr << PAGE_SHIFT) |
+                      pgprot_val(pgprot)) & __supported_pte_mask);
 }
 
 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
 {
-        return __pmd((((unsigned long long)page_nr << PAGE_SHIFT) | \
-                        pgprot_val(pgprot)) & __supported_pte_mask);
+        return __pmd((((unsigned long long)page_nr << PAGE_SHIFT) |
+                      pgprot_val(pgprot)) & __supported_pte_mask);
 }
 
 /*
diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h
index 143ddc42b86..147f2553784 100644
--- a/include/asm-i386/pgtable.h
+++ b/include/asm-i386/pgtable.h
@@ -266,6 +266,8 @@ static inline pte_t pte_mkhuge(pte_t pte)	{ (pte).pte_low |= _PAGE_PSE; return p
 #define pte_update(mm, addr, ptep)              do { } while (0)
 #define pte_update_defer(mm, addr, ptep)        do { } while (0)
 #define paravirt_map_pt_hook(slot, va, pfn)     do { } while (0)
+
+#define raw_ptep_get_and_clear(xp)     native_ptep_get_and_clear(xp)
 #endif
 
 /*