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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] x86: Move guest_l*e definitions into common code
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1226581282 0
# Node ID b87cc4de3ca676e895f6374daed1d33a79849b9d
# Parent 9f68b6ae6243dd8af575ce79bc60d74e1f2364c4
x86: Move guest_l*e definitions into common code
Move the definitions of guest pagetable types and the guest pagetable
walk record out of the shadow-code headers into asm-x86.
Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
---
xen/arch/x86/mm/shadow/multi.c | 16 +--
xen/arch/x86/mm/shadow/types.h | 203 +----------------------------------------
xen/include/asm-x86/guest_pt.h | 202 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 215 insertions(+), 206 deletions(-)
diff -r 9f68b6ae6243 -r b87cc4de3ca6 xen/arch/x86/mm/shadow/multi.c
--- a/xen/arch/x86/mm/shadow/multi.c Thu Nov 13 10:50:50 2008 +0000
+++ b/xen/arch/x86/mm/shadow/multi.c Thu Nov 13 13:01:22 2008 +0000
@@ -35,6 +35,7 @@
#include <asm/hvm/hvm.h>
#include <asm/hvm/cacheattr.h>
#include <asm/mtrr.h>
+#include <asm/guest_pt.h>
#include "private.h"
#include "types.h"
@@ -254,7 +255,7 @@ static uint32_t set_ad_bits(void *guest_
* Return 1 to indicate success and 0 for inconsistency
*/
static inline uint32_t
-shadow_check_gwalk(struct vcpu *v, unsigned long va, walk_t *gw)
+shadow_check_gwalk(struct vcpu *v, unsigned long va, walk_t *gw, int version)
{
struct domain *d = v->domain;
guest_l1e_t *l1p;
@@ -267,9 +268,8 @@ shadow_check_gwalk(struct vcpu *v, unsig
ASSERT(shadow_locked_by_me(d));
- if ( gw->version ==
- atomic_read(&d->arch.paging.shadow.gtable_dirty_version) )
- return 1;
+ if ( version == atomic_read(&d->arch.paging.shadow.gtable_dirty_version) )
+ return 1;
/* We may consider caching guest page mapping from last
* guest table walk. However considering this check happens
@@ -401,9 +401,6 @@ guest_walk_tables(struct vcpu *v, unsign
perfc_incr(shadow_guest_walk);
memset(gw, 0, sizeof(*gw));
gw->va = va;
-
- gw->version = atomic_read(&d->arch.paging.shadow.gtable_dirty_version);
- rmb();
/* Mandatory bits that must be set in every entry. We invert NX, to
* calculate as if there were an "X" bit that allowed access.
@@ -3173,6 +3170,7 @@ static int sh_page_fault(struct vcpu *v,
fetch_type_t ft = 0;
p2m_type_t p2mt;
uint32_t rc;
+ int version;
#if SHADOW_OPTIMIZATIONS & SHOPT_FAST_EMULATION
int fast_emul = 0;
#endif
@@ -3316,6 +3314,8 @@ static int sh_page_fault(struct vcpu *v,
}
rewalk:
+ version = atomic_read(&d->arch.paging.shadow.gtable_dirty_version);
+ rmb();
rc = guest_walk_tables(v, va, &gw, regs->error_code);
#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC)
@@ -3392,7 +3392,7 @@ static int sh_page_fault(struct vcpu *v,
}
#endif /* OOS */
- if ( !shadow_check_gwalk(v, va, &gw) )
+ if ( !shadow_check_gwalk(v, va, &gw, version) )
{
perfc_incr(shadow_inconsistent_gwalk);
shadow_unlock(d);
diff -r 9f68b6ae6243 -r b87cc4de3ca6 xen/arch/x86/mm/shadow/types.h
--- a/xen/arch/x86/mm/shadow/types.h Thu Nov 13 10:50:50 2008 +0000
+++ b/xen/arch/x86/mm/shadow/types.h Thu Nov 13 13:01:22 2008 +0000
@@ -191,169 +191,13 @@ static inline shadow_l4e_t shadow_l4e_fr
})
#endif
-
-/* Type of the guest's frame numbers */
-TYPE_SAFE(unsigned long,gfn)
-#define SH_PRI_gfn "05lx"
-
-#define VALID_GFN(m) (m != INVALID_GFN)
-
-static inline int
-valid_gfn(gfn_t m)
-{
- return VALID_GFN(gfn_x(m));
-}
-
-static inline paddr_t
-gfn_to_paddr(gfn_t gfn)
-{
- return ((paddr_t)gfn_x(gfn)) << PAGE_SHIFT;
-}
-
-/* Override gfn_to_mfn to work with gfn_t */
-#undef gfn_to_mfn
-#define gfn_to_mfn(d, g, t) _gfn_to_mfn((d), gfn_x(g), (t))
+/* The shadow types needed for the various levels. */
#if GUEST_PAGING_LEVELS == 2
-
-#include "../page-guest32.h"
-
-#define GUEST_L1_PAGETABLE_ENTRIES 1024
-#define GUEST_L2_PAGETABLE_ENTRIES 1024
-#define GUEST_L1_PAGETABLE_SHIFT 12
-#define GUEST_L2_PAGETABLE_SHIFT 22
-
-/* Types of the guest's page tables */
-typedef l1_pgentry_32_t guest_l1e_t;
-typedef l2_pgentry_32_t guest_l2e_t;
-typedef intpte_32_t guest_intpte_t;
-
-/* Access functions for them */
-static inline paddr_t guest_l1e_get_paddr(guest_l1e_t gl1e)
-{ return l1e_get_paddr_32(gl1e); }
-static inline paddr_t guest_l2e_get_paddr(guest_l2e_t gl2e)
-{ return l2e_get_paddr_32(gl2e); }
-
-static inline gfn_t guest_l1e_get_gfn(guest_l1e_t gl1e)
-{ return _gfn(l1e_get_paddr_32(gl1e) >> PAGE_SHIFT); }
-static inline gfn_t guest_l2e_get_gfn(guest_l2e_t gl2e)
-{ return _gfn(l2e_get_paddr_32(gl2e) >> PAGE_SHIFT); }
-
-static inline u32 guest_l1e_get_flags(guest_l1e_t gl1e)
-{ return l1e_get_flags_32(gl1e); }
-static inline u32 guest_l2e_get_flags(guest_l2e_t gl2e)
-{ return l2e_get_flags_32(gl2e); }
-
-static inline guest_l1e_t guest_l1e_add_flags(guest_l1e_t gl1e, u32 flags)
-{ l1e_add_flags_32(gl1e, flags); return gl1e; }
-static inline guest_l2e_t guest_l2e_add_flags(guest_l2e_t gl2e, u32 flags)
-{ l2e_add_flags_32(gl2e, flags); return gl2e; }
-
-static inline guest_l1e_t guest_l1e_from_gfn(gfn_t gfn, u32 flags)
-{ return l1e_from_pfn_32(gfn_x(gfn), flags); }
-static inline guest_l2e_t guest_l2e_from_gfn(gfn_t gfn, u32 flags)
-{ return l2e_from_pfn_32(gfn_x(gfn), flags); }
-
-#define guest_l1_table_offset(a) l1_table_offset_32(a)
-#define guest_l2_table_offset(a) l2_table_offset_32(a)
-
-/* The shadow types needed for the various levels. */
#define SH_type_l1_shadow SH_type_l1_32_shadow
#define SH_type_l2_shadow SH_type_l2_32_shadow
#define SH_type_fl1_shadow SH_type_fl1_32_shadow
-
-#else /* GUEST_PAGING_LEVELS != 2 */
-
-#if GUEST_PAGING_LEVELS == 3
-#define GUEST_L1_PAGETABLE_ENTRIES 512
-#define GUEST_L2_PAGETABLE_ENTRIES 512
-#define GUEST_L3_PAGETABLE_ENTRIES 4
-#define GUEST_L1_PAGETABLE_SHIFT 12
-#define GUEST_L2_PAGETABLE_SHIFT 21
-#define GUEST_L3_PAGETABLE_SHIFT 30
-#else /* GUEST_PAGING_LEVELS == 4 */
-#define GUEST_L1_PAGETABLE_ENTRIES 512
-#define GUEST_L2_PAGETABLE_ENTRIES 512
-#define GUEST_L3_PAGETABLE_ENTRIES 512
-#define GUEST_L4_PAGETABLE_ENTRIES 512
-#define GUEST_L1_PAGETABLE_SHIFT 12
-#define GUEST_L2_PAGETABLE_SHIFT 21
-#define GUEST_L3_PAGETABLE_SHIFT 30
-#define GUEST_L4_PAGETABLE_SHIFT 39
-#endif
-
-/* Types of the guest's page tables */
-typedef l1_pgentry_t guest_l1e_t;
-typedef l2_pgentry_t guest_l2e_t;
-typedef l3_pgentry_t guest_l3e_t;
-#if GUEST_PAGING_LEVELS >= 4
-typedef l4_pgentry_t guest_l4e_t;
-#endif
-typedef intpte_t guest_intpte_t;
-
-/* Access functions for them */
-static inline paddr_t guest_l1e_get_paddr(guest_l1e_t gl1e)
-{ return l1e_get_paddr(gl1e); }
-static inline paddr_t guest_l2e_get_paddr(guest_l2e_t gl2e)
-{ return l2e_get_paddr(gl2e); }
-static inline paddr_t guest_l3e_get_paddr(guest_l3e_t gl3e)
-{ return l3e_get_paddr(gl3e); }
-#if GUEST_PAGING_LEVELS >= 4
-static inline paddr_t guest_l4e_get_paddr(guest_l4e_t gl4e)
-{ return l4e_get_paddr(gl4e); }
-#endif
-
-static inline gfn_t guest_l1e_get_gfn(guest_l1e_t gl1e)
-{ return _gfn(l1e_get_paddr(gl1e) >> PAGE_SHIFT); }
-static inline gfn_t guest_l2e_get_gfn(guest_l2e_t gl2e)
-{ return _gfn(l2e_get_paddr(gl2e) >> PAGE_SHIFT); }
-static inline gfn_t guest_l3e_get_gfn(guest_l3e_t gl3e)
-{ return _gfn(l3e_get_paddr(gl3e) >> PAGE_SHIFT); }
-#if GUEST_PAGING_LEVELS >= 4
-static inline gfn_t guest_l4e_get_gfn(guest_l4e_t gl4e)
-{ return _gfn(l4e_get_paddr(gl4e) >> PAGE_SHIFT); }
-#endif
-
-static inline u32 guest_l1e_get_flags(guest_l1e_t gl1e)
-{ return l1e_get_flags(gl1e); }
-static inline u32 guest_l2e_get_flags(guest_l2e_t gl2e)
-{ return l2e_get_flags(gl2e); }
-static inline u32 guest_l3e_get_flags(guest_l3e_t gl3e)
-{ return l3e_get_flags(gl3e); }
-#if GUEST_PAGING_LEVELS >= 4
-static inline u32 guest_l4e_get_flags(guest_l4e_t gl4e)
-{ return l4e_get_flags(gl4e); }
-#endif
-
-static inline guest_l1e_t guest_l1e_add_flags(guest_l1e_t gl1e, u32 flags)
-{ l1e_add_flags(gl1e, flags); return gl1e; }
-static inline guest_l2e_t guest_l2e_add_flags(guest_l2e_t gl2e, u32 flags)
-{ l2e_add_flags(gl2e, flags); return gl2e; }
-static inline guest_l3e_t guest_l3e_add_flags(guest_l3e_t gl3e, u32 flags)
-{ l3e_add_flags(gl3e, flags); return gl3e; }
-#if GUEST_PAGING_LEVELS >= 4
-static inline guest_l4e_t guest_l4e_add_flags(guest_l4e_t gl4e, u32 flags)
-{ l4e_add_flags(gl4e, flags); return gl4e; }
-#endif
-
-static inline guest_l1e_t guest_l1e_from_gfn(gfn_t gfn, u32 flags)
-{ return l1e_from_pfn(gfn_x(gfn), flags); }
-static inline guest_l2e_t guest_l2e_from_gfn(gfn_t gfn, u32 flags)
-{ return l2e_from_pfn(gfn_x(gfn), flags); }
-static inline guest_l3e_t guest_l3e_from_gfn(gfn_t gfn, u32 flags)
-{ return l3e_from_pfn(gfn_x(gfn), flags); }
-#if GUEST_PAGING_LEVELS >= 4
-static inline guest_l4e_t guest_l4e_from_gfn(gfn_t gfn, u32 flags)
-{ return l4e_from_pfn(gfn_x(gfn), flags); }
-#endif
-
-#define guest_l1_table_offset(a) l1_table_offset(a)
-#define guest_l2_table_offset(a) l2_table_offset(a)
-#define guest_l3_table_offset(a) l3_table_offset(a)
-#define guest_l4_table_offset(a) l4_table_offset(a)
-
-/* The shadow types needed for the various levels. */
-#if GUEST_PAGING_LEVELS == 3
+#elif GUEST_PAGING_LEVELS == 3
#define SH_type_l1_shadow SH_type_l1_pae_shadow
#define SH_type_fl1_shadow SH_type_fl1_pae_shadow
#define SH_type_l2_shadow SH_type_l2_pae_shadow
@@ -366,35 +210,6 @@ static inline guest_l4e_t guest_l4e_from
#define SH_type_l3_shadow SH_type_l3_64_shadow
#define SH_type_l4_shadow SH_type_l4_64_shadow
#endif
-
-#endif /* GUEST_PAGING_LEVELS != 2 */
-
-
-/* Type used for recording a walk through guest pagetables. It is
- * filled in by the pagetable walk function, and also used as a cache
- * for later walks. When we encounter a suporpage l2e, we fabricate an
- * l1e for propagation to the shadow (for splintering guest superpages
- * into many shadow l1 entries). */
-typedef struct shadow_walk_t walk_t;
-struct shadow_walk_t
-{
- unsigned long va; /* Address we were looking for */
-#if GUEST_PAGING_LEVELS >= 3
-#if GUEST_PAGING_LEVELS >= 4
- guest_l4e_t l4e; /* Guest's level 4 entry */
-#endif
- guest_l3e_t l3e; /* Guest's level 3 entry */
-#endif
- guest_l2e_t l2e; /* Guest's level 2 entry */
- guest_l1e_t l1e; /* Guest's level 1 entry (or fabrication) */
-#if GUEST_PAGING_LEVELS >= 4
- mfn_t l4mfn; /* MFN that the level 4 entry was in */
- mfn_t l3mfn; /* MFN that the level 3 entry was in */
-#endif
- mfn_t l2mfn; /* MFN that the level 2 entry was in */
- mfn_t l1mfn; /* MFN that the level 1 entry was in */
- int version; /* Saved guest dirty version */
-};
/* macros for dealing with the naming of the internal function names of the
* shadow code's external entry points.
@@ -460,17 +275,9 @@ struct shadow_walk_t
#define MFN_FITS_IN_HVM_CR3(_MFN) !(mfn_x(_MFN) >> 20)
#endif
-#define SH_PRI_pte PRIpte
-
-#if GUEST_PAGING_LEVELS == 2
-#define SH_PRI_gpte "08x"
-#else /* GUEST_PAGING_LEVELS >= 3 */
-#ifndef __x86_64__
-#define SH_PRI_gpte "016llx"
-#else
-#define SH_PRI_gpte "016lx"
-#endif
-#endif /* GUEST_PAGING_LEVELS >= 3 */
+#define SH_PRI_pte PRIpte
+#define SH_PRI_gpte PRI_gpte
+#define SH_PRI_gfn PRI_gfn
#if (SHADOW_OPTIMIZATIONS & SHOPT_FAST_FAULT_PATH)
diff -r 9f68b6ae6243 -r b87cc4de3ca6 xen/include/asm-x86/guest_pt.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/include/asm-x86/guest_pt.h Thu Nov 13 13:01:22 2008 +0000
@@ -0,0 +1,202 @@
+/******************************************************************************
+ * xen/asm-x86/guest_pt.h
+ *
+ * Types and accessors for guest pagetable entries, as distinct from
+ * Xen's pagetable types.
+ *
+ * Users must #define GUEST_PAGING_LEVELS to 2, 3 or 4 before including
+ * this file.
+ *
+ * Parts of this code are Copyright (c) 2006 by XenSource Inc.
+ * Parts of this code are Copyright (c) 2006 by Michael A Fetterman
+ * Parts based on earlier work by Michael A Fetterman, Ian Pratt et al.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef _XEN_ASM_GUEST_PT_H
+#define _XEN_ASM_GUEST_PT_H
+
+/* Type of the guest's frame numbers */
+TYPE_SAFE(unsigned long,gfn)
+#define PRI_gfn "05lx"
+
+#define VALID_GFN(m) (m != INVALID_GFN)
+
+static inline int
+valid_gfn(gfn_t m)
+{
+ return VALID_GFN(gfn_x(m));
+}
+
+static inline paddr_t
+gfn_to_paddr(gfn_t gfn)
+{
+ return ((paddr_t)gfn_x(gfn)) << PAGE_SHIFT;
+}
+
+/* Override gfn_to_mfn to work with gfn_t */
+#undef gfn_to_mfn
+#define gfn_to_mfn(d, g, t) _gfn_to_mfn((d), gfn_x(g), (t))
+
+
+/* Types of the guest's page tables and access functions for them */
+
+#if GUEST_PAGING_LEVELS == 2
+
+#define GUEST_L1_PAGETABLE_ENTRIES 1024
+#define GUEST_L2_PAGETABLE_ENTRIES 1024
+#define GUEST_L1_PAGETABLE_SHIFT 12
+#define GUEST_L2_PAGETABLE_SHIFT 22
+
+typedef uint32_t guest_intpte_t;
+typedef struct { guest_intpte_t l1; } guest_l1e_t;
+typedef struct { guest_intpte_t l2; } guest_l2e_t;
+
+#define PRI_gpte "08x"
+
+static inline paddr_t guest_l1e_get_paddr(guest_l1e_t gl1e)
+{ return ((paddr_t) gl1e.l1) & (PADDR_MASK & PAGE_MASK); }
+static inline paddr_t guest_l2e_get_paddr(guest_l2e_t gl2e)
+{ return ((paddr_t) gl2e.l2) & (PADDR_MASK & PAGE_MASK); }
+
+static inline gfn_t guest_l1e_get_gfn(guest_l1e_t gl1e)
+{ return _gfn(guest_l1e_get_paddr(gl1e) >> PAGE_SHIFT); }
+static inline gfn_t guest_l2e_get_gfn(guest_l2e_t gl2e)
+{ return _gfn(guest_l2e_get_paddr(gl2e) >> PAGE_SHIFT); }
+
+static inline u32 guest_l1e_get_flags(guest_l1e_t gl1e)
+{ return gl1e.l1 & 0xfff; }
+static inline u32 guest_l2e_get_flags(guest_l2e_t gl2e)
+{ return gl2e.l2 & 0xfff; }
+
+static inline guest_l1e_t guest_l1e_from_gfn(gfn_t gfn, u32 flags)
+{ return (guest_l1e_t) { (gfn_x(gfn) << PAGE_SHIFT) | flags }; }
+static inline guest_l2e_t guest_l2e_from_gfn(gfn_t gfn, u32 flags)
+{ return (guest_l2e_t) { (gfn_x(gfn) << PAGE_SHIFT) | flags }; }
+
+#define guest_l1_table_offset(_va) \
+ (((_va) >> GUEST_L1_PAGETABLE_SHIFT) & (GUEST_L1_PAGETABLE_ENTRIES - 1))
+#define guest_l2_table_offset(_va) \
+ (((_va) >> GUEST_L2_PAGETABLE_SHIFT) & (GUEST_L2_PAGETABLE_ENTRIES - 1))
+
+#else /* GUEST_PAGING_LEVELS != 2 */
+
+#if GUEST_PAGING_LEVELS == 3
+#define GUEST_L1_PAGETABLE_ENTRIES 512
+#define GUEST_L2_PAGETABLE_ENTRIES 512
+#define GUEST_L3_PAGETABLE_ENTRIES 4
+#define GUEST_L1_PAGETABLE_SHIFT 12
+#define GUEST_L2_PAGETABLE_SHIFT 21
+#define GUEST_L3_PAGETABLE_SHIFT 30
+#else /* GUEST_PAGING_LEVELS == 4 */
+#define GUEST_L1_PAGETABLE_ENTRIES 512
+#define GUEST_L2_PAGETABLE_ENTRIES 512
+#define GUEST_L3_PAGETABLE_ENTRIES 512
+#define GUEST_L4_PAGETABLE_ENTRIES 512
+#define GUEST_L1_PAGETABLE_SHIFT 12
+#define GUEST_L2_PAGETABLE_SHIFT 21
+#define GUEST_L3_PAGETABLE_SHIFT 30
+#define GUEST_L4_PAGETABLE_SHIFT 39
+#endif
+
+typedef l1_pgentry_t guest_l1e_t;
+typedef l2_pgentry_t guest_l2e_t;
+typedef l3_pgentry_t guest_l3e_t;
+#if GUEST_PAGING_LEVELS >= 4
+typedef l4_pgentry_t guest_l4e_t;
+#endif
+typedef intpte_t guest_intpte_t;
+
+#define PRI_gpte "016"PRIx64
+
+static inline paddr_t guest_l1e_get_paddr(guest_l1e_t gl1e)
+{ return l1e_get_paddr(gl1e); }
+static inline paddr_t guest_l2e_get_paddr(guest_l2e_t gl2e)
+{ return l2e_get_paddr(gl2e); }
+static inline paddr_t guest_l3e_get_paddr(guest_l3e_t gl3e)
+{ return l3e_get_paddr(gl3e); }
+#if GUEST_PAGING_LEVELS >= 4
+static inline paddr_t guest_l4e_get_paddr(guest_l4e_t gl4e)
+{ return l4e_get_paddr(gl4e); }
+#endif
+
+static inline gfn_t guest_l1e_get_gfn(guest_l1e_t gl1e)
+{ return _gfn(l1e_get_paddr(gl1e) >> PAGE_SHIFT); }
+static inline gfn_t guest_l2e_get_gfn(guest_l2e_t gl2e)
+{ return _gfn(l2e_get_paddr(gl2e) >> PAGE_SHIFT); }
+static inline gfn_t guest_l3e_get_gfn(guest_l3e_t gl3e)
+{ return _gfn(l3e_get_paddr(gl3e) >> PAGE_SHIFT); }
+#if GUEST_PAGING_LEVELS >= 4
+static inline gfn_t guest_l4e_get_gfn(guest_l4e_t gl4e)
+{ return _gfn(l4e_get_paddr(gl4e) >> PAGE_SHIFT); }
+#endif
+
+static inline u32 guest_l1e_get_flags(guest_l1e_t gl1e)
+{ return l1e_get_flags(gl1e); }
+static inline u32 guest_l2e_get_flags(guest_l2e_t gl2e)
+{ return l2e_get_flags(gl2e); }
+static inline u32 guest_l3e_get_flags(guest_l3e_t gl3e)
+{ return l3e_get_flags(gl3e); }
+#if GUEST_PAGING_LEVELS >= 4
+static inline u32 guest_l4e_get_flags(guest_l4e_t gl4e)
+{ return l4e_get_flags(gl4e); }
+#endif
+
+static inline guest_l1e_t guest_l1e_from_gfn(gfn_t gfn, u32 flags)
+{ return l1e_from_pfn(gfn_x(gfn), flags); }
+static inline guest_l2e_t guest_l2e_from_gfn(gfn_t gfn, u32 flags)
+{ return l2e_from_pfn(gfn_x(gfn), flags); }
+static inline guest_l3e_t guest_l3e_from_gfn(gfn_t gfn, u32 flags)
+{ return l3e_from_pfn(gfn_x(gfn), flags); }
+#if GUEST_PAGING_LEVELS >= 4
+static inline guest_l4e_t guest_l4e_from_gfn(gfn_t gfn, u32 flags)
+{ return l4e_from_pfn(gfn_x(gfn), flags); }
+#endif
+
+#define guest_l1_table_offset(a) l1_table_offset(a)
+#define guest_l2_table_offset(a) l2_table_offset(a)
+#define guest_l3_table_offset(a) l3_table_offset(a)
+#define guest_l4_table_offset(a) l4_table_offset(a)
+
+#endif /* GUEST_PAGING_LEVELS != 2 */
+
+
+/* Type used for recording a walk through guest pagetables. It is
+ * filled in by the pagetable walk function, and also used as a cache
+ * for later walks. When we encounter a superpage l2e, we fabricate an
+ * l1e for propagation to the shadow (for splintering guest superpages
+ * into many shadow l1 entries). */
+typedef struct guest_pagetable_walk walk_t;
+struct guest_pagetable_walk
+{
+ unsigned long va; /* Address we were looking for */
+#if GUEST_PAGING_LEVELS >= 3
+#if GUEST_PAGING_LEVELS >= 4
+ guest_l4e_t l4e; /* Guest's level 4 entry */
+#endif
+ guest_l3e_t l3e; /* Guest's level 3 entry */
+#endif
+ guest_l2e_t l2e; /* Guest's level 2 entry */
+ guest_l1e_t l1e; /* Guest's level 1 entry (or fabrication) */
+#if GUEST_PAGING_LEVELS >= 4
+ mfn_t l4mfn; /* MFN that the level 4 entry was in */
+ mfn_t l3mfn; /* MFN that the level 3 entry was in */
+#endif
+ mfn_t l2mfn; /* MFN that the level 2 entry was in */
+ mfn_t l1mfn; /* MFN that the level 1 entry was in */
+};
+
+#endif /* _XEN_ASM_GUEST_PT_H */
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