4 files changed, 226 insertions, 237 deletions

diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 5cc821c..ae559fe 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -49,11 +49,3 @@ config XEN_DEBUG_FS
 	help
 	  Enable statistics output and various tuning options in debugfs.
 	  Enabling this option may incur a significant performance overhead.
-
-config XEN_DEBUG
-	bool "Enable Xen debug checks"
-	depends on XEN
-	default n
-	help
-	  Enable various WARN_ON checks in the Xen MMU code.
-	  Enabling this option WILL incur a significant performance overhead.
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 3dd53f9..87f6673 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -495,41 +495,6 @@ static pte_t xen_make_pte(pteval_t pte)
 }
 PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte);
 
-#ifdef CONFIG_XEN_DEBUG
-pte_t xen_make_pte_debug(pteval_t pte)
-{
-	phys_addr_t addr = (pte & PTE_PFN_MASK);
-	phys_addr_t other_addr;
-	bool io_page = false;
-	pte_t _pte;
-
-	if (pte & _PAGE_IOMAP)
-		io_page = true;
-
-	_pte = xen_make_pte(pte);
-
-	if (!addr)
-		return _pte;
-
-	if (io_page &&
-	    (xen_initial_domain() || addr >= ISA_END_ADDRESS)) {
-		other_addr = pfn_to_mfn(addr >> PAGE_SHIFT) << PAGE_SHIFT;
-		WARN_ONCE(addr != other_addr,
-			"0x%lx is using VM_IO, but it is 0x%lx!\n",
-			(unsigned long)addr, (unsigned long)other_addr);
-	} else {
-		pteval_t iomap_set = (_pte.pte & PTE_FLAGS_MASK) & _PAGE_IOMAP;
-		other_addr = (_pte.pte & PTE_PFN_MASK);
-		WARN_ONCE((addr == other_addr) && (!io_page) && (!iomap_set),
-			"0x%lx is missing VM_IO (and wasn't fixed)!\n",
-			(unsigned long)addr);
-	}
-
-	return _pte;
-}
-PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte_debug);
-#endif
-
 static pgd_t xen_make_pgd(pgdval_t pgd)
 {
 	pgd = pte_pfn_to_mfn(pgd);
@@ -1992,9 +1957,6 @@ void __init xen_ident_map_ISA(void)
 
 static void __init xen_post_allocator_init(void)
 {
-#ifdef CONFIG_XEN_DEBUG
-	pv_mmu_ops.make_pte = PV_CALLEE_SAVE(xen_make_pte_debug);
-#endif
 	pv_mmu_ops.set_pte = xen_set_pte;
 	pv_mmu_ops.set_pmd = xen_set_pmd;
 	pv_mmu_ops.set_pud = xen_set_pud;
@@ -2404,17 +2366,3 @@ out:
 	return err;
 }
 EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
-
-#ifdef CONFIG_XEN_DEBUG_FS
-static int p2m_dump_open(struct inode *inode, struct file *filp)
-{
-	return single_open(filp, p2m_dump_show, NULL);
-}
-
-static const struct file_operations p2m_dump_fops = {
-	.open		= p2m_dump_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
-#endif /* CONFIG_XEN_DEBUG_FS */
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 795e003..1b267e7 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -161,7 +161,9 @@
 #include <asm/xen/page.h>
 #include <asm/xen/hypercall.h>
 #include <asm/xen/hypervisor.h>
+#include <xen/grant_table.h>
 
+#include "multicalls.h"
 #include "xen-ops.h"
 
 static void __init m2p_override_init(void);
@@ -676,7 +678,8 @@ static unsigned long mfn_hash(unsigned long mfn)
 }
 
 /* Add an MFN override for a particular page */
-int m2p_add_override(unsigned long mfn, struct page *page, bool clear_pte)
+int m2p_add_override(unsigned long mfn, struct page *page,
+		struct gnttab_map_grant_ref *kmap_op)
 {
 	unsigned long flags;
 	unsigned long pfn;
@@ -692,16 +695,28 @@ int m2p_add_override(unsigned long mfn, struct page *page, bool clear_pte)
 					"m2p_add_override: pfn %lx not mapped", pfn))
 			return -EINVAL;
 	}
-
-	page->private = mfn;
+	WARN_ON(PagePrivate(page));
+	SetPagePrivate(page);
+	set_page_private(page, mfn);
 	page->index = pfn_to_mfn(pfn);
 
 	if (unlikely(!set_phys_to_machine(pfn, FOREIGN_FRAME(mfn))))
 		return -ENOMEM;
 
-	if (clear_pte && !PageHighMem(page))
-		/* Just zap old mapping for now */
-		pte_clear(&init_mm, address, ptep);
+	if (kmap_op != NULL) {
+		if (!PageHighMem(page)) {
+			struct multicall_space mcs =
+				xen_mc_entry(sizeof(*kmap_op));
+
+			MULTI_grant_table_op(mcs.mc,
+					GNTTABOP_map_grant_ref, kmap_op, 1);
+
+			xen_mc_issue(PARAVIRT_LAZY_MMU);
+		}
+		/* let's use dev_bus_addr to record the old mfn instead */
+		kmap_op->dev_bus_addr = page->index;
+		page->index = (unsigned long) kmap_op;
+	}
 	spin_lock_irqsave(&m2p_override_lock, flags);
 	list_add(&page->lru,  &m2p_overrides[mfn_hash(mfn)]);
 	spin_unlock_irqrestore(&m2p_override_lock, flags);
@@ -735,13 +750,56 @@ int m2p_remove_override(struct page *page, bool clear_pte)
 	spin_lock_irqsave(&m2p_override_lock, flags);
 	list_del(&page->lru);
 	spin_unlock_irqrestore(&m2p_override_lock, flags);
-	set_phys_to_machine(pfn, page->index);
+	WARN_ON(!PagePrivate(page));
+	ClearPagePrivate(page);
 
-	if (clear_pte && !PageHighMem(page))
-		set_pte_at(&init_mm, address, ptep,
-				pfn_pte(pfn, PAGE_KERNEL));
-		/* No tlb flush necessary because the caller already
-		 * left the pte unmapped. */
+	if (clear_pte) {
+		struct gnttab_map_grant_ref *map_op =
+			(struct gnttab_map_grant_ref *) page->index;
+		set_phys_to_machine(pfn, map_op->dev_bus_addr);
+		if (!PageHighMem(page)) {
+			struct multicall_space mcs;
+			struct gnttab_unmap_grant_ref *unmap_op;
+
+			/*
+			 * It might be that we queued all the m2p grant table
+			 * hypercalls in a multicall, then m2p_remove_override
+			 * get called before the multicall has actually been
+			 * issued. In this case handle is going to -1 because
+			 * it hasn't been modified yet.
+			 */
+			if (map_op->handle == -1)
+				xen_mc_flush();
+			/*
+			 * Now if map_op->handle is negative it means that the
+			 * hypercall actually returned an error.
+			 */
+			if (map_op->handle == GNTST_general_error) {
+				printk(KERN_WARNING "m2p_remove_override: "
+						"pfn %lx mfn %lx, failed to modify kernel mappings",
+						pfn, mfn);
+				return -1;
+			}
+
+			mcs = xen_mc_entry(
+					sizeof(struct gnttab_unmap_grant_ref));
+			unmap_op = mcs.args;
+			unmap_op->host_addr = map_op->host_addr;
+			unmap_op->handle = map_op->handle;
+			unmap_op->dev_bus_addr = 0;
+
+			MULTI_grant_table_op(mcs.mc,
+					GNTTABOP_unmap_grant_ref, unmap_op, 1);
+
+			xen_mc_issue(PARAVIRT_LAZY_MMU);
+
+			set_pte_at(&init_mm, address, ptep,
+					pfn_pte(pfn, PAGE_KERNEL));
+			__flush_tlb_single(address);
+			map_op->host_addr = 0;
+		}
+	} else
+		set_phys_to_machine(pfn, page->index);
 
 	return 0;
 }
@@ -758,7 +816,7 @@ struct page *m2p_find_override(unsigned long mfn)
 	spin_lock_irqsave(&m2p_override_lock, flags);
 
 	list_for_each_entry(p, bucket, lru) {
-		if (p->private == mfn) {
+		if (page_private(p) == mfn) {
 			ret = p;
 			break;
 		}
@@ -782,8 +840,9 @@ unsigned long m2p_find_override_pfn(unsigned long mfn, unsigned long pfn)
 EXPORT_SYMBOL_GPL(m2p_find_override_pfn);
 
 #ifdef CONFIG_XEN_DEBUG_FS
-
-int p2m_dump_show(struct seq_file *m, void *v)
+#include <linux/debugfs.h>
+#include "debugfs.h"
+static int p2m_dump_show(struct seq_file *m, void *v)
 {
 	static const char * const level_name[] = { "top", "middle",
 						"entry", "abnormal", "error"};
@@ -859,4 +918,32 @@ int p2m_dump_show(struct seq_file *m, void *v)
 #undef TYPE_PFN
 #undef TYPE_UNKNOWN
 }
-#endif
+
+static int p2m_dump_open(struct inode *inode, struct file *filp)
+{
+	return single_open(filp, p2m_dump_show, NULL);
+}
+
+static const struct file_operations p2m_dump_fops = {
+	.open		= p2m_dump_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static struct dentry *d_mmu_debug;
+
+static int __init xen_p2m_debugfs(void)
+{
+	struct dentry *d_xen = xen_init_debugfs();
+
+	if (d_xen == NULL)
+		return -ENOMEM;
+
+	d_mmu_debug = debugfs_create_dir("mmu", d_xen);
+
+	debugfs_create_file("p2m", 0600, d_mmu_debug, NULL, &p2m_dump_fops);
+	return 0;
+}
+fs_initcall(xen_p2m_debugfs);
+#endif /* CONFIG_XEN_DEBUG_FS */
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 46d6d21..38d0af4 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -37,7 +37,10 @@ extern void xen_syscall_target(void);
 extern void xen_syscall32_target(void);
 
 /* Amount of extra memory space we add to the e820 ranges */
-phys_addr_t xen_extra_mem_start, xen_extra_mem_size;
+struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
+
+/* Number of pages released from the initial allocation. */
+unsigned long xen_released_pages;
 
 /* 
  * The maximum amount of extra memory compared to the base size.  The
@@ -51,48 +54,47 @@ phys_addr_t xen_extra_mem_start, xen_extra_mem_size;
  */
 #define EXTRA_MEM_RATIO		(10)
 
-static void __init xen_add_extra_mem(unsigned long pages)
+static void __init xen_add_extra_mem(u64 start, u64 size)
 {
 	unsigned long pfn;
+	int i;
 
-	u64 size = (u64)pages * PAGE_SIZE;
-	u64 extra_start = xen_extra_mem_start + xen_extra_mem_size;
-
-	if (!pages)
-		return;
-
-	e820_add_region(extra_start, size, E820_RAM);
-	sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
-
-	memblock_x86_reserve_range(extra_start, extra_start + size, "XEN EXTRA");
+	for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
+		/* Add new region. */
+		if (xen_extra_mem[i].size == 0) {
+			xen_extra_mem[i].start = start;
+			xen_extra_mem[i].size  = size;
+			break;
+		}
+		/* Append to existing region. */
+		if (xen_extra_mem[i].start + xen_extra_mem[i].size == start) {
+			xen_extra_mem[i].size += size;
+			break;
+		}
+	}
+	if (i == XEN_EXTRA_MEM_MAX_REGIONS)
+		printk(KERN_WARNING "Warning: not enough extra memory regions\n");
 
-	xen_extra_mem_size += size;
+	memblock_x86_reserve_range(start, start + size, "XEN EXTRA");
 
-	xen_max_p2m_pfn = PFN_DOWN(extra_start + size);
+	xen_max_p2m_pfn = PFN_DOWN(start + size);
 
-	for (pfn = PFN_DOWN(extra_start); pfn <= xen_max_p2m_pfn; pfn++)
+	for (pfn = PFN_DOWN(start); pfn <= xen_max_p2m_pfn; pfn++)
 		__set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
 }
 
-static unsigned long __init xen_release_chunk(phys_addr_t start_addr,
-					      phys_addr_t end_addr)
+static unsigned long __init xen_release_chunk(unsigned long start,
+					      unsigned long end)
 {
 	struct xen_memory_reservation reservation = {
 		.address_bits = 0,
 		.extent_order = 0,
 		.domid        = DOMID_SELF
 	};
-	unsigned long start, end;
 	unsigned long len = 0;
 	unsigned long pfn;
 	int ret;
 
-	start = PFN_UP(start_addr);
-	end = PFN_DOWN(end_addr);
-
-	if (end <= start)
-		return 0;
-
 	for(pfn = start; pfn < end; pfn++) {
 		unsigned long mfn = pfn_to_mfn(pfn);
 
@@ -117,72 +119,52 @@ static unsigned long __init xen_release_chunk(phys_addr_t start_addr,
 	return len;
 }
 
-static unsigned long __init xen_return_unused_memory(unsigned long max_pfn,
-						     const struct e820map *e820)
+static unsigned long __init xen_set_identity_and_release(
+	const struct e820entry *list, size_t map_size, unsigned long nr_pages)
 {
-	phys_addr_t max_addr = PFN_PHYS(max_pfn);
-	phys_addr_t last_end = ISA_END_ADDRESS;
+	phys_addr_t start = 0;
 	unsigned long released = 0;
-	int i;
-
-	/* Free any unused memory above the low 1Mbyte. */
-	for (i = 0; i < e820->nr_map && last_end < max_addr; i++) {
-		phys_addr_t end = e820->map[i].addr;
-		end = min(max_addr, end);
-
-		if (last_end < end)
-			released += xen_release_chunk(last_end, end);
-		last_end = max(last_end, e820->map[i].addr + e820->map[i].size);
-	}
-
-	if (last_end < max_addr)
-		released += xen_release_chunk(last_end, max_addr);
-
-	printk(KERN_INFO "released %lu pages of unused memory\n", released);
-	return released;
-}
-
-static unsigned long __init xen_set_identity(const struct e820entry *list,
-					     ssize_t map_size)
-{
-	phys_addr_t last = xen_initial_domain() ? 0 : ISA_END_ADDRESS;
-	phys_addr_t start_pci = last;
-	const struct e820entry *entry;
 	unsigned long identity = 0;
+	const struct e820entry *entry;
 	int i;
 
+	/*
+	 * Combine non-RAM regions and gaps until a RAM region (or the
+	 * end of the map) is reached, then set the 1:1 map and
+	 * release the pages (if available) in those non-RAM regions.
+	 *
+	 * The combined non-RAM regions are rounded to a whole number
+	 * of pages so any partial pages are accessible via the 1:1
+	 * mapping.  This is needed for some BIOSes that put (for
+	 * example) the DMI tables in a reserved region that begins on
+	 * a non-page boundary.
+	 */
 	for (i = 0, entry = list; i < map_size; i++, entry++) {
-		phys_addr_t start = entry->addr;
-		phys_addr_t end = start + entry->size;
+		phys_addr_t end = entry->addr + entry->size;
 
-		if (start < last)
-			start = last;
+		if (entry->type == E820_RAM || i == map_size - 1) {
+			unsigned long start_pfn = PFN_DOWN(start);
+			unsigned long end_pfn = PFN_UP(end);
 
-		if (end <= start)
-			continue;
+			if (entry->type == E820_RAM)
+				end_pfn = PFN_UP(entry->addr);
 
-		/* Skip over the 1MB region. */
-		if (last > end)
-			continue;
+			if (start_pfn < end_pfn) {
+				if (start_pfn < nr_pages)
+					released += xen_release_chunk(
+						start_pfn, min(end_pfn, nr_pages));
 
-		if ((entry->type == E820_RAM) || (entry->type == E820_UNUSABLE)) {
-			if (start > start_pci)
 				identity += set_phys_range_identity(
-						PFN_UP(start_pci), PFN_DOWN(start));
-
-			/* Without saving 'last' we would gooble RAM too
-			 * at the end of the loop. */
-			last = end;
-			start_pci = end;
-			continue;
+					start_pfn, end_pfn);
+			}
+			start = end;
 		}
-		start_pci = min(start, start_pci);
-		last = end;
 	}
-	if (last > start_pci)
-		identity += set_phys_range_identity(
-					PFN_UP(start_pci), PFN_DOWN(last));
-	return identity;
+
+	printk(KERN_INFO "Released %lu pages of unused memory\n", released);
+	printk(KERN_INFO "Set %ld page(s) to 1-1 mapping\n", identity);
+
+	return released;
 }
 
 static unsigned long __init xen_get_max_pages(void)
@@ -197,21 +179,32 @@ static unsigned long __init xen_get_max_pages(void)
 	return min(max_pages, MAX_DOMAIN_PAGES);
 }
 
+static void xen_align_and_add_e820_region(u64 start, u64 size, int type)
+{
+	u64 end = start + size;
+
+	/* Align RAM regions to page boundaries. */
+	if (type == E820_RAM) {
+		start = PAGE_ALIGN(start);
+		end &= ~((u64)PAGE_SIZE - 1);
+	}
+
+	e820_add_region(start, end - start, type);
+}
+
 /**
  * machine_specific_memory_setup - Hook for machine specific memory setup.
  **/
 char * __init xen_memory_setup(void)
 {
 	static struct e820entry map[E820MAX] __initdata;
-	static struct e820entry map_raw[E820MAX] __initdata;
 
 	unsigned long max_pfn = xen_start_info->nr_pages;
 	unsigned long long mem_end;
 	int rc;
 	struct xen_memory_map memmap;
+	unsigned long max_pages;
 	unsigned long extra_pages = 0;
-	unsigned long extra_limit;
-	unsigned long identity_pages = 0;
 	int i;
 	int op;
 
@@ -237,58 +230,65 @@ char * __init xen_memory_setup(void)
 	}
 	BUG_ON(rc);
 
-	memcpy(map_raw, map, sizeof(map));
-	e820.nr_map = 0;
-	xen_extra_mem_start = mem_end;
-	for (i = 0; i < memmap.nr_entries; i++) {
-		unsigned long long end;
-
-		/* Guard against non-page aligned E820 entries. */
-		if (map[i].type == E820_RAM)
-			map[i].size -= (map[i].size + map[i].addr) % PAGE_SIZE;
-
-		end = map[i].addr + map[i].size;
-		if (map[i].type == E820_RAM && end > mem_end) {
-			/* RAM off the end - may be partially included */
-			u64 delta = min(map[i].size, end - mem_end);
-
-			map[i].size -= delta;
-			end -= delta;
-
-			extra_pages += PFN_DOWN(delta);
-			/*
-			 * Set RAM below 4GB that is not for us to be unusable.
-			 * This prevents "System RAM" address space from being
-			 * used as potential resource for I/O address (happens
-			 * when 'allocate_resource' is called).
-			 */
-			if (delta &&
-				(xen_initial_domain() && end < 0x100000000ULL))
-				e820_add_region(end, delta, E820_UNUSABLE);
+	/* Make sure the Xen-supplied memory map is well-ordered. */
+	sanitize_e820_map(map, memmap.nr_entries, &memmap.nr_entries);
+
+	max_pages = xen_get_max_pages();
+	if (max_pages > max_pfn)
+		extra_pages += max_pages - max_pfn;
+
+	/*
+	 * Set P2M for all non-RAM pages and E820 gaps to be identity
+	 * type PFNs.  Any RAM pages that would be made inaccesible by
+	 * this are first released.
+	 */
+	xen_released_pages = xen_set_identity_and_release(
+		map, memmap.nr_entries, max_pfn);
+	extra_pages += xen_released_pages;
+
+	/*
+	 * Clamp the amount of extra memory to a EXTRA_MEM_RATIO
+	 * factor the base size.  On non-highmem systems, the base
+	 * size is the full initial memory allocation; on highmem it
+	 * is limited to the max size of lowmem, so that it doesn't
+	 * get completely filled.
+	 *
+	 * In principle there could be a problem in lowmem systems if
+	 * the initial memory is also very large with respect to
+	 * lowmem, but we won't try to deal with that here.
+	 */
+	extra_pages = min(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)),
+			  extra_pages);
+
+	i = 0;
+	while (i < memmap.nr_entries) {
+		u64 addr = map[i].addr;
+		u64 size = map[i].size;
+		u32 type = map[i].type;
+
+		if (type == E820_RAM) {
+			if (addr < mem_end) {
+				size = min(size, mem_end - addr);
+			} else if (extra_pages) {
+				size = min(size, (u64)extra_pages * PAGE_SIZE);
+				extra_pages -= size / PAGE_SIZE;
+				xen_add_extra_mem(addr, size);
+			} else
+				type = E820_UNUSABLE;
 		}
 
-		if (map[i].size > 0 && end > xen_extra_mem_start)
-			xen_extra_mem_start = end;
+		xen_align_and_add_e820_region(addr, size, type);
 
-		/* Add region if any remains */
-		if (map[i].size > 0)
-			e820_add_region(map[i].addr, map[i].size, map[i].type);
+		map[i].addr += size;
+		map[i].size -= size;
+		if (map[i].size == 0)
+			i++;
 	}
-	/* Align the balloon area so that max_low_pfn does not get set
-	 * to be at the _end_ of the PCI gap at the far end (fee01000).
-	 * Note that xen_extra_mem_start gets set in the loop above to be
-	 * past the last E820 region. */
-	if (xen_initial_domain() && (xen_extra_mem_start < (1ULL<<32)))
-		xen_extra_mem_start = (1ULL<<32);
 
 	/*
 	 * In domU, the ISA region is normal, usable memory, but we
 	 * reserve ISA memory anyway because too many things poke
 	 * about in there.
-	 *
-	 * In Dom0, the host E820 information can leave gaps in the
-	 * ISA range, which would cause us to release those pages.  To
-	 * avoid this, we unconditionally reserve them here.
 	 */
 	e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS,
 			E820_RESERVED);
@@ -305,44 +305,6 @@ char * __init xen_memory_setup(void)
 
 	sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 
-	extra_limit = xen_get_max_pages();
-	if (max_pfn + extra_pages > extra_limit) {
-		if (extra_limit > max_pfn)
-			extra_pages = extra_limit - max_pfn;
-		else
-			extra_pages = 0;
-	}
-
-	extra_pages += xen_return_unused_memory(xen_start_info->nr_pages, &e820);
-
-	/*
-	 * Clamp the amount of extra memory to a EXTRA_MEM_RATIO
-	 * factor the base size.  On non-highmem systems, the base
-	 * size is the full initial memory allocation; on highmem it
-	 * is limited to the max size of lowmem, so that it doesn't
-	 * get completely filled.
-	 *
-	 * In principle there could be a problem in lowmem systems if
-	 * the initial memory is also very large with respect to
-	 * lowmem, but we won't try to deal with that here.
-	 */
-	extra_limit = min(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)),
-			  max_pfn + extra_pages);
-
-	if (extra_limit >= max_pfn)
-		extra_pages = extra_limit - max_pfn;
-	else
-		extra_pages = 0;
-
-	xen_add_extra_mem(extra_pages);
-
-	/*
-	 * Set P2M for all non-RAM pages and E820 gaps to be identity
-	 * type PFNs. We supply it with the non-sanitized version
-	 * of the E820.
-	 */
-	identity_pages = xen_set_identity(map_raw, memmap.nr_entries);
-	printk(KERN_INFO "Set %ld page(s) to 1-1 mapping.\n", identity_pages);
 	return "Xen";
 }