Merge branch 'x86/core' into x86/mce2

12 files changed, 169 insertions, 136 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index bd720a67f559..3afc94abe357 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1827,7 +1827,7 @@ config DMAR
 	  remapping devices.
 
 config DMAR_DEFAULT_ON
-	def_bool n
+	def_bool y
 	prompt "Enable DMA Remapping Devices by default"
 	depends on DMAR
 	help
diff --git a/arch/x86/include/asm/iomap.h b/arch/x86/include/asm/iomap.h
index c1f06289b14b..86af26091d6c 100644
--- a/arch/x86/include/asm/iomap.h
+++ b/arch/x86/include/asm/iomap.h
@@ -23,6 +23,9 @@
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>
 
+int
+is_io_mapping_possible(resource_size_t base, unsigned long size);
+
 void *
 iomap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot);
 
diff --git a/arch/x86/include/asm/pat.h b/arch/x86/include/asm/pat.h
index 9709fdff6615..b0e70056838e 100644
--- a/arch/x86/include/asm/pat.h
+++ b/arch/x86/include/asm/pat.h
@@ -15,4 +15,7 @@ extern int reserve_memtype(u64 start, u64 end,
 		unsigned long req_type, unsigned long *ret_type);
 extern int free_memtype(u64 start, u64 end);
 
+extern int kernel_map_sync_memtype(u64 base, unsigned long size,
+		unsigned long flag);
+
 #endif /* _ASM_X86_PAT_H */
diff --git a/arch/x86/include/asm/uaccess_32.h b/arch/x86/include/asm/uaccess_32.h
index 5e06259e90e5..a0ba61386972 100644
--- a/arch/x86/include/asm/uaccess_32.h
+++ b/arch/x86/include/asm/uaccess_32.h
@@ -157,7 +157,7 @@ __copy_from_user(void *to, const void __user *from, unsigned long n)
 }
 
 static __always_inline unsigned long __copy_from_user_nocache(void *to,
-				const void __user *from, unsigned long n)
+		const void __user *from, unsigned long n, unsigned long total)
 {
 	might_fault();
 	if (__builtin_constant_p(n)) {
@@ -180,7 +180,7 @@ static __always_inline unsigned long __copy_from_user_nocache(void *to,
 
 static __always_inline unsigned long
 __copy_from_user_inatomic_nocache(void *to, const void __user *from,
-				  unsigned long n)
+				  unsigned long n, unsigned long total)
 {
        return __copy_from_user_ll_nocache_nozero(to, from, n);
 }
diff --git a/arch/x86/include/asm/uaccess_64.h b/arch/x86/include/asm/uaccess_64.h
index 987a2c10fe20..dcaa0404cf7b 100644
--- a/arch/x86/include/asm/uaccess_64.h
+++ b/arch/x86/include/asm/uaccess_64.h
@@ -189,7 +189,7 @@ extern long __copy_user_nocache(void *dst, const void __user *src,
 				unsigned size, int zerorest);
 
 static inline int __copy_from_user_nocache(void *dst, const void __user *src,
-					   unsigned size)
+				   unsigned size, unsigned long total)
 {
 	might_sleep();
 	/*
@@ -198,17 +198,16 @@ static inline int __copy_from_user_nocache(void *dst, const void __user *src,
 	 * non-temporal stores here. Smaller writes get handled
 	 * via regular __copy_from_user():
 	 */
-	if (likely(size >= PAGE_SIZE))
+	if (likely(total >= PAGE_SIZE))
 		return __copy_user_nocache(dst, src, size, 1);
 	else
 		return __copy_from_user(dst, src, size);
 }
 
 static inline int __copy_from_user_inatomic_nocache(void *dst,
-						    const void __user *src,
-						    unsigned size)
+	    const void __user *src, unsigned size, unsigned total)
 {
-	if (likely(size >= PAGE_SIZE))
+	if (likely(total >= PAGE_SIZE))
 		return __copy_user_nocache(dst, src, size, 0);
 	else
 		return __copy_from_user_inatomic(dst, src, size);
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 5b8394a3a6b2..4c80f1557433 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -503,12 +503,12 @@ void *text_poke_early(void *addr, const void *opcode, size_t len)
  */
 void *__kprobes text_poke(void *addr, const void *opcode, size_t len)
 {
-	unsigned long flags;
 	char *vaddr;
 	int nr_pages = 2;
 	struct page *pages[2];
 	int i;
 
+	might_sleep();
 	if (!core_kernel_text((unsigned long)addr)) {
 		pages[0] = vmalloc_to_page(addr);
 		pages[1] = vmalloc_to_page(addr + PAGE_SIZE);
@@ -522,9 +522,9 @@ void *__kprobes text_poke(void *addr, const void *opcode, size_t len)
 		nr_pages = 1;
 	vaddr = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
 	BUG_ON(!vaddr);
-	local_irq_save(flags);
+	local_irq_disable();
 	memcpy(&vaddr[(unsigned long)addr & ~PAGE_MASK], opcode, len);
-	local_irq_restore(flags);
+	local_irq_enable();
 	vunmap(vaddr);
 	sync_core();
 	/* Could also do a CLFLUSH here to speed up CPU recovery; but
diff --git a/arch/x86/kernel/apic/summit_32.c b/arch/x86/kernel/apic/summit_32.c
index cfe7b09015d8..32838b57a945 100644
--- a/arch/x86/kernel/apic/summit_32.c
+++ b/arch/x86/kernel/apic/summit_32.c
@@ -48,7 +48,7 @@
 #include <linux/gfp.h>
 #include <linux/smp.h>
 
-static inline unsigned summit_get_apic_id(unsigned long x)
+static unsigned summit_get_apic_id(unsigned long x)
 {
 	return (x >> 24) & 0xFF;
 }
@@ -58,7 +58,7 @@ static inline void summit_send_IPI_mask(const cpumask_t *mask, int vector)
 	default_send_IPI_mask_sequence_logical(mask, vector);
 }
 
-static inline void summit_send_IPI_allbutself(int vector)
+static void summit_send_IPI_allbutself(int vector)
 {
 	cpumask_t mask = cpu_online_map;
 	cpu_clear(smp_processor_id(), mask);
@@ -67,7 +67,7 @@ static inline void summit_send_IPI_allbutself(int vector)
 		summit_send_IPI_mask(&mask, vector);
 }
 
-static inline void summit_send_IPI_all(int vector)
+static void summit_send_IPI_all(int vector)
 {
 	summit_send_IPI_mask(&cpu_online_map, vector);
 }
@@ -82,8 +82,8 @@ extern void setup_summit(void);
 #define setup_summit()	{}
 #endif
 
-static inline int
-summit_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid)
+static int summit_mps_oem_check(struct mpc_table *mpc, char *oem,
+		char *productid)
 {
 	if (!strncmp(oem, "IBM ENSW", 8) &&
 			(!strncmp(productid, "VIGIL SMP", 9)
@@ -98,7 +98,7 @@ summit_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid)
 }
 
 /* Hook from generic ACPI tables.c */
-static inline int summit_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
+static int summit_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 {
 	if (!strncmp(oem_id, "IBM", 3) &&
 	    (!strncmp(oem_table_id, "SERVIGIL", 8)
@@ -186,7 +186,7 @@ static inline int is_WPEG(struct rio_detail *rio){
 
 #define SUMMIT_APIC_DFR_VALUE	(APIC_DFR_CLUSTER)
 
-static inline const cpumask_t *summit_target_cpus(void)
+static const cpumask_t *summit_target_cpus(void)
 {
 	/* CPU_MASK_ALL (0xff) has undefined behaviour with
 	 * dest_LowestPrio mode logical clustered apic interrupt routing
@@ -195,19 +195,18 @@ static inline const cpumask_t *summit_target_cpus(void)
 	return &cpumask_of_cpu(0);
 }
 
-static inline unsigned long
-summit_check_apicid_used(physid_mask_t bitmap, int apicid)
+static unsigned long summit_check_apicid_used(physid_mask_t bitmap, int apicid)
 {
 	return 0;
 }
 
 /* we don't use the phys_cpu_present_map to indicate apicid presence */
-static inline unsigned long summit_check_apicid_present(int bit)
+static unsigned long summit_check_apicid_present(int bit)
 {
 	return 1;
 }
 
-static inline void summit_init_apic_ldr(void)
+static void summit_init_apic_ldr(void)
 {
 	unsigned long val, id;
 	int count = 0;
@@ -234,18 +233,18 @@ static inline void summit_init_apic_ldr(void)
 	apic_write(APIC_LDR, val);
 }
 
-static inline int summit_apic_id_registered(void)
+static int summit_apic_id_registered(void)
 {
 	return 1;
 }
 
-static inline void summit_setup_apic_routing(void)
+static void summit_setup_apic_routing(void)
 {
 	printk("Enabling APIC mode:  Summit.  Using %d I/O APICs\n",
 						nr_ioapics);
 }
 
-static inline int summit_apicid_to_node(int logical_apicid)
+static int summit_apicid_to_node(int logical_apicid)
 {
 #ifdef CONFIG_SMP
 	return apicid_2_node[hard_smp_processor_id()];
@@ -266,7 +265,7 @@ static inline int summit_cpu_to_logical_apicid(int cpu)
 #endif
 }
 
-static inline int summit_cpu_present_to_apicid(int mps_cpu)
+static int summit_cpu_present_to_apicid(int mps_cpu)
 {
 	if (mps_cpu < nr_cpu_ids)
 		return (int)per_cpu(x86_bios_cpu_apicid, mps_cpu);
@@ -274,28 +273,23 @@ static inline int summit_cpu_present_to_apicid(int mps_cpu)
 		return BAD_APICID;
 }
 
-static inline physid_mask_t
-summit_ioapic_phys_id_map(physid_mask_t phys_id_map)
+static physid_mask_t summit_ioapic_phys_id_map(physid_mask_t phys_id_map)
 {
 	/* For clustered we don't have a good way to do this yet - hack */
 	return physids_promote(0x0F);
 }
 
-static inline physid_mask_t summit_apicid_to_cpu_present(int apicid)
+static physid_mask_t summit_apicid_to_cpu_present(int apicid)
 {
 	return physid_mask_of_physid(0);
 }
 
-static inline void summit_setup_portio_remap(void)
-{
-}
-
-static inline int summit_check_phys_apicid_present(int boot_cpu_physical_apicid)
+static int summit_check_phys_apicid_present(int boot_cpu_physical_apicid)
 {
 	return 1;
 }
 
-static inline unsigned int summit_cpu_mask_to_apicid(const cpumask_t *cpumask)
+static unsigned int summit_cpu_mask_to_apicid(const cpumask_t *cpumask)
 {
 	int cpus_found = 0;
 	int num_bits_set;
@@ -303,12 +297,10 @@ static inline unsigned int summit_cpu_mask_to_apicid(const cpumask_t *cpumask)
 	int cpu;
 
 	num_bits_set = cpus_weight(*cpumask);
-	/* Return id to all */
 	if (num_bits_set >= nr_cpu_ids)
-		return 0xFF;
+		return BAD_APICID;
 	/*
-	 * The cpus in the mask must all be on the apic cluster.  If are not
-	 * on the same apicid cluster return default value of target_cpus():
+	 * The cpus in the mask must all be on the apic cluster.
 	 */
 	cpu = first_cpu(*cpumask);
 	apicid = summit_cpu_to_logical_apicid(cpu);
@@ -318,9 +310,9 @@ static inline unsigned int summit_cpu_mask_to_apicid(const cpumask_t *cpumask)
 			int new_apicid = summit_cpu_to_logical_apicid(cpu);
 
 			if (APIC_CLUSTER(apicid) != APIC_CLUSTER(new_apicid)) {
-				printk ("%s: Not a valid mask!\n", __func__);
+				printk("%s: Not a valid mask!\n", __func__);
 
-				return 0xFF;
+				return BAD_APICID;
 			}
 			apicid = apicid | new_apicid;
 			cpus_found++;
@@ -330,8 +322,7 @@ static inline unsigned int summit_cpu_mask_to_apicid(const cpumask_t *cpumask)
 	return apicid;
 }
 
-static inline unsigned int
-summit_cpu_mask_to_apicid_and(const struct cpumask *inmask,
+static unsigned int summit_cpu_mask_to_apicid_and(const struct cpumask *inmask,
 			      const struct cpumask *andmask)
 {
 	int apicid = summit_cpu_to_logical_apicid(0);
@@ -356,7 +347,7 @@ summit_cpu_mask_to_apicid_and(const struct cpumask *inmask,
  *
  * See Intel's IA-32 SW Dev's Manual Vol2 under CPUID.
  */
-static inline int summit_phys_pkg_id(int cpuid_apic, int index_msb)
+static int summit_phys_pkg_id(int cpuid_apic, int index_msb)
 {
 	return hard_smp_processor_id() >> index_msb;
 }
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index e85826829cf2..508bec1cee27 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -858,6 +858,9 @@ void __init reserve_early_overlap_ok(u64 start, u64 end, char *name)
  */
 void __init reserve_early(u64 start, u64 end, char *name)
 {
+	if (start >= end)
+		return;
+
 	drop_overlaps_that_are_ok(start, end);
 	__reserve_early(start, end, name, 0);
 }
diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c
index ca53224fc56c..04102d42ff42 100644
--- a/arch/x86/mm/iomap_32.c
+++ b/arch/x86/mm/iomap_32.c
@@ -20,6 +20,17 @@
 #include <asm/pat.h>
 #include <linux/module.h>
 
+int is_io_mapping_possible(resource_size_t base, unsigned long size)
+{
+#ifndef CONFIG_X86_PAE
+	/* There is no way to map greater than 1 << 32 address without PAE */
+	if (base + size > 0x100000000ULL)
+		return 0;
+#endif
+	return 1;
+}
+EXPORT_SYMBOL_GPL(is_io_mapping_possible);
+
 /* Map 'pfn' using fixed map 'type' and protections 'prot'
  */
 void *
diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c
index 9cab18b0b857..0bcd7883d036 100644
--- a/arch/x86/mm/memtest.c
+++ b/arch/x86/mm/memtest.c
@@ -9,44 +9,44 @@
 
 #include <asm/e820.h>
 
-static void __init memtest(unsigned long start_phys, unsigned long size,
-				 unsigned pattern)
+static u64 patterns[] __initdata = {
+	0,
+	0xffffffffffffffffULL,
+	0x5555555555555555ULL,
+	0xaaaaaaaaaaaaaaaaULL,
+	0x1111111111111111ULL,
+	0x2222222222222222ULL,
+	0x4444444444444444ULL,
+	0x8888888888888888ULL,
+	0x3333333333333333ULL,
+	0x6666666666666666ULL,
+	0x9999999999999999ULL,
+	0xccccccccccccccccULL,
+	0x7777777777777777ULL,
+	0xbbbbbbbbbbbbbbbbULL,
+	0xddddddddddddddddULL,
+	0xeeeeeeeeeeeeeeeeULL,
+	0x7a6c7258554e494cULL, /* yeah ;-) */
+};
+
+static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad)
 {
-	unsigned long i;
-	unsigned long *start;
-	unsigned long start_bad;
-	unsigned long last_bad;
-	unsigned long val;
-	unsigned long start_phys_aligned;
-	unsigned long count;
-	unsigned long incr;
-
-	switch (pattern) {
-	case 0:
-		val = 0UL;
-		break;
-	case 1:
-		val = -1UL;
-		break;
-	case 2:
-#ifdef CONFIG_X86_64
-		val = 0x5555555555555555UL;
-#else
-		val = 0x55555555UL;
-#endif
-		break;
-	case 3:
-#ifdef CONFIG_X86_64
-		val = 0xaaaaaaaaaaaaaaaaUL;
-#else
-		val = 0xaaaaaaaaUL;
-#endif
-		break;
-	default:
-		return;
-	}
+	printk(KERN_INFO "  %016llx bad mem addr %010llx - %010llx reserved\n",
+	       (unsigned long long) pattern,
+	       (unsigned long long) start_bad,
+	       (unsigned long long) end_bad);
+	reserve_early(start_bad, end_bad, "BAD RAM");
+}
 
-	incr = sizeof(unsigned long);
+static void __init memtest(u64 pattern, u64 start_phys, u64 size)
+{
+	u64 i, count;
+	u64 *start;
+	u64 start_bad, last_bad;
+	u64 start_phys_aligned;
+	size_t incr;
+
+	incr = sizeof(pattern);
 	start_phys_aligned = ALIGN(start_phys, incr);
 	count = (size - (start_phys_aligned - start_phys))/incr;
 	start = __va(start_phys_aligned);
@@ -54,25 +54,42 @@ static void __init memtest(unsigned long start_phys, unsigned long size,
 	last_bad = 0;
 
 	for (i = 0; i < count; i++)
-		start[i] = val;
+		start[i] = pattern;
 	for (i = 0; i < count; i++, start++, start_phys_aligned += incr) {
-		if (*start != val) {
-			if (start_phys_aligned == last_bad + incr) {
-				last_bad += incr;
-			} else {
-				if (start_bad) {
-					printk(KERN_CONT "\n  %016lx bad mem addr %010lx - %010lx reserved",
-						val, start_bad, last_bad + incr);
-					reserve_early(start_bad, last_bad + incr, "BAD RAM");
-				}
-				start_bad = last_bad = start_phys_aligned;
-			}
+		if (*start == pattern)
+			continue;
+		if (start_phys_aligned == last_bad + incr) {
+			last_bad += incr;
+			continue;
 		}
+		if (start_bad)
+			reserve_bad_mem(pattern, start_bad, last_bad + incr);
+		start_bad = last_bad = start_phys_aligned;
 	}
-	if (start_bad) {
-		printk(KERN_CONT "\n  %016lx bad mem addr %010lx - %010lx reserved",
-			val, start_bad, last_bad + incr);
-		reserve_early(start_bad, last_bad + incr, "BAD RAM");
+	if (start_bad)
+		reserve_bad_mem(pattern, start_bad, last_bad + incr);
+}
+
+static void __init do_one_pass(u64 pattern, u64 start, u64 end)
+{
+	u64 size = 0;
+
+	while (start < end) {
+		start = find_e820_area_size(start, &size, 1);
+
+		/* done ? */
+		if (start >= end)
+			break;
+		if (start + size > end)
+			size = end - start;
+
+		printk(KERN_INFO "  %010llx - %010llx pattern %016llx\n",
+		       (unsigned long long) start,
+		       (unsigned long long) start + size,
+		       (unsigned long long) cpu_to_be64(pattern));
+		memtest(pattern, start, size);
+
+		start += size;
 	}
 }
 
@@ -90,33 +107,22 @@ early_param("memtest", parse_memtest);
 
 void __init early_memtest(unsigned long start, unsigned long end)
 {
-	u64 t_start, t_size;
-	unsigned pattern;
+	unsigned int i;
+	unsigned int idx = 0;
 
 	if (!memtest_pattern)
 		return;
 
-	printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern);
-	for (pattern = 0; pattern < memtest_pattern; pattern++) {
-		t_start = start;
-		t_size = 0;
-		while (t_start < end) {
-			t_start = find_e820_area_size(t_start, &t_size, 1);
-
-			/* done ? */
-			if (t_start >= end)
-				break;
-			if (t_start + t_size > end)
-				t_size = end - t_start;
-
-			printk(KERN_CONT "\n  %010llx - %010llx pattern %d",
-				(unsigned long long)t_start,
-				(unsigned long long)t_start + t_size, pattern);
-
-			memtest(t_start, t_size, pattern);
+	printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern);
+	for (i = 0; i < memtest_pattern; i++) {
+		idx = i % ARRAY_SIZE(patterns);
+		do_one_pass(patterns[idx], start, end);
+	}
 
-			t_start += t_size;
-		}
+	if (idx > 0) {
+		printk(KERN_INFO "early_memtest: wipe out "
+		       "test pattern from memory\n");
+		/* additional test with pattern 0 will do this */
+		do_one_pass(0, start, end);
 	}
-	printk(KERN_CONT "\n");
 }
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 05f9aef6818a..2ed37158012d 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -11,6 +11,7 @@
 #include <linux/bootmem.h>
 #include <linux/debugfs.h>
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/gfp.h>
 #include <linux/mm.h>
 #include <linux/fs.h>
@@ -634,6 +635,33 @@ void unmap_devmem(unsigned long pfn, unsigned long size, pgprot_t vma_prot)
 }
 
 /*
+ * Change the memory type for the physial address range in kernel identity
+ * mapping space if that range is a part of identity map.
+ */
+int kernel_map_sync_memtype(u64 base, unsigned long size, unsigned long flags)
+{
+	unsigned long id_sz;
+
+	if (!pat_enabled || base >= __pa(high_memory))
+		return 0;
+
+	id_sz = (__pa(high_memory) < base + size) ?
+				__pa(high_memory) - base :
+				size;
+
+	if (ioremap_change_attr((unsigned long)__va(base), id_sz, flags) < 0) {
+		printk(KERN_INFO
+			"%s:%d ioremap_change_attr failed %s "
+			"for %Lx-%Lx\n",
+			current->comm, current->pid,
+			cattr_name(flags),
+			base, (unsigned long long)(base + size));
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/*
  * Internal interface to reserve a range of physical memory with prot.
  * Reserved non RAM regions only and after successful reserve_memtype,
  * this func also keeps identity mapping (if any) in sync with this new prot.
@@ -642,7 +670,7 @@ static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t *vma_prot,
 				int strict_prot)
 {
 	int is_ram = 0;
-	int id_sz, ret;
+	int ret;
 	unsigned long flags;
 	unsigned long want_flags = (pgprot_val(*vma_prot) & _PAGE_CACHE_MASK);
 
@@ -679,23 +707,8 @@ static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t *vma_prot,
 				     flags);
 	}
 
-	/* Need to keep identity mapping in sync */
-	if (paddr >= __pa(high_memory))
-		return 0;
-
-	id_sz = (__pa(high_memory) < paddr + size) ?
-				__pa(high_memory) - paddr :
-				size;
-
-	if (ioremap_change_attr((unsigned long)__va(paddr), id_sz, flags) < 0) {
+	if (kernel_map_sync_memtype(paddr, size, flags) < 0) {
 		free_memtype(paddr, paddr + size);
-		printk(KERN_ERR
-			"%s:%d reserve_pfn_range ioremap_change_attr failed %s "
-			"for %Lx-%Lx\n",
-			current->comm, current->pid,
-			cattr_name(flags),
-			(unsigned long long)paddr,
-			(unsigned long long)(paddr + size));
 		return -EINVAL;
 	}
 	return 0;
@@ -877,6 +890,7 @@ pgprot_t pgprot_writecombine(pgprot_t prot)
 	else
 		return pgprot_noncached(prot);
 }
+EXPORT_SYMBOL_GPL(pgprot_writecombine);
 
 #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_X86_PAT)
 
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 86497d5f44cd..c52f4034c7fd 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -940,6 +940,9 @@ asmlinkage void __init xen_start_kernel(void)
 	   possible map and a non-dummy shared_info. */
 	per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
 
+	local_irq_disable();
+	early_boot_irqs_off();
+
 	xen_raw_console_write("mapping kernel into physical memory\n");
 	pgd = xen_setup_kernel_pagetable(pgd, xen_start_info->nr_pages);