From: jbeulich@novell.com
Subject: Disallow all accesses to the local APIC page
Patch-mainline: n/a
References: bnc#191115

--- head-2011-03-11.orig/arch/x86/include/asm/apic.h	2011-02-17 10:23:17.000000000 +0100
+++ head-2011-03-11/arch/x86/include/asm/apic.h	2011-02-17 10:36:33.000000000 +0100
@@ -10,7 +10,9 @@
 #include <asm/processor.h>
 #include <asm/apicdef.h>
 #include <asm/atomic.h>
+#ifndef CONFIG_XEN
 #include <asm/fixmap.h>
+#endif
 #include <asm/mpspec.h>
 #include <asm/system.h>
 #include <asm/msr.h>
@@ -49,6 +51,7 @@ static inline void generic_apic_probe(vo
 #ifdef CONFIG_X86_LOCAL_APIC
 
 extern unsigned int apic_verbosity;
+#ifndef CONFIG_XEN
 extern int local_apic_timer_c2_ok;
 
 extern int disable_apic;
@@ -121,6 +124,8 @@ extern u64 native_apic_icr_read(void);
 
 extern int x2apic_mode;
 
+#endif /* CONFIG_XEN */
+
 #ifdef CONFIG_X86_X2APIC
 /*
  * Make previous memory operations globally visible before
@@ -371,6 +376,8 @@ struct apic {
  */
 extern struct apic *apic;
 
+#ifndef CONFIG_XEN
+
 /*
  * APIC functionality to boot other CPUs - only used on SMP:
  */
@@ -473,6 +480,8 @@ static inline void default_wait_for_init
 
 extern void generic_bigsmp_probe(void);
 
+#endif /* CONFIG_XEN */
+
 
 #ifdef CONFIG_X86_LOCAL_APIC
 
@@ -492,6 +501,8 @@ static inline const struct cpumask *defa
 DECLARE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid);
 
 
+#ifndef CONFIG_XEN
+
 static inline unsigned int read_apic_id(void)
 {
 	unsigned int reg;
@@ -600,6 +611,8 @@ extern int default_cpu_present_to_apicid
 extern int default_check_phys_apicid_present(int phys_apicid);
 #endif
 
+#endif /* CONFIG_XEN */
+
 #endif /* CONFIG_X86_LOCAL_APIC */
 
 #ifdef CONFIG_X86_32
--- head-2011-03-11.orig/arch/x86/include/asm/apicdef.h	2011-03-11 10:41:53.000000000 +0100
+++ head-2011-03-11/arch/x86/include/asm/apicdef.h	2011-02-03 14:34:58.000000000 +0100
@@ -17,6 +17,8 @@
  */
 #define IO_APIC_SLOT_SIZE		1024
 
+#ifndef CONFIG_XEN
+
 #define	APIC_ID		0x20
 
 #define	APIC_LVR	0x30
@@ -143,6 +145,16 @@
 #define APIC_BASE_MSR	0x800
 #define X2APIC_ENABLE	(1UL << 10)
 
+#else /* CONFIG_XEN */
+
+enum {
+	APIC_DEST_ALLBUT = 0x1,
+	APIC_DEST_SELF,
+	APIC_DEST_ALLINC
+};
+
+#endif /* CONFIG_XEN */
+
 #ifdef CONFIG_X86_32
 # define MAX_IO_APICS 64
 # define MAX_LOCAL_APIC 256
@@ -151,6 +163,8 @@
 # define MAX_LOCAL_APIC 32768
 #endif
 
+#ifndef CONFIG_XEN
+
 /*
  * All x86-64 systems are xAPIC compatible.
  * In the following, "apicid" is a physical APIC ID.
@@ -421,6 +435,8 @@ struct local_apic {
 
 #undef u32
 
+#endif /* CONFIG_XEN */
+
 #ifdef CONFIG_X86_32
  #define BAD_APICID 0xFFu
 #else
--- head-2011-03-11.orig/arch/x86/include/mach-xen/asm/fixmap.h	2011-02-01 15:41:35.000000000 +0100
+++ head-2011-03-11/arch/x86/include/mach-xen/asm/fixmap.h	2011-02-03 14:34:58.000000000 +0100
@@ -17,7 +17,6 @@
 #ifndef __ASSEMBLY__
 #include <linux/kernel.h>
 #include <asm/acpi.h>
-#include <asm/apicdef.h>
 #include <asm/page.h>
 #ifdef CONFIG_X86_32
 #include <linux/threads.h>
@@ -85,10 +84,10 @@ enum fixed_addresses {
 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 	FIX_OHCI1394_BASE,
 #endif
+#ifndef CONFIG_XEN
 #ifdef CONFIG_X86_LOCAL_APIC
 	FIX_APIC_BASE,	/* local (CPU) APIC) -- required for SMP or not */
 #endif
-#ifndef CONFIG_XEN
 #ifdef CONFIG_X86_IO_APIC
 	FIX_IO_APIC_BASE_0,
 	FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
--- head-2011-03-11.orig/arch/x86/include/mach-xen/asm/smp.h	2011-03-03 16:12:54.000000000 +0100
+++ head-2011-03-11/arch/x86/include/mach-xen/asm/smp.h	2011-03-03 16:50:42.000000000 +0100
@@ -15,7 +15,7 @@
 #  include <asm/io_apic.h>
 # endif
 #endif
-#include <asm/thread_info.h>
+#include <linux/thread_info.h>
 #include <asm/cpumask.h>
 
 extern unsigned int num_processors;
@@ -190,7 +190,7 @@ extern unsigned disabled_cpus __cpuinitd
 
 #include <asm/smp-processor-id.h>
 
-#ifdef CONFIG_X86_LOCAL_APIC
+#if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_XEN)
 
 #ifndef CONFIG_X86_64
 static inline int logical_smp_processor_id(void)
--- head-2011-03-11.orig/arch/x86/kernel/acpi/boot.c	2011-03-11 11:06:22.000000000 +0100
+++ head-2011-03-11/arch/x86/kernel/acpi/boot.c	2011-03-11 11:17:06.000000000 +0100
@@ -74,14 +74,14 @@ int acpi_sci_override_gsi __initdata;
 int acpi_skip_timer_override __initdata;
 int acpi_use_timer_override __initdata;
 int acpi_fix_pin2_polarity __initdata;
-#else
-#define acpi_skip_timer_override 0
-#define acpi_fix_pin2_polarity 0
-#endif
 
 #ifdef CONFIG_X86_LOCAL_APIC
 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
 #endif
+#else
+#define acpi_skip_timer_override 0
+#define acpi_fix_pin2_polarity 0
+#endif
 
 #ifndef __HAVE_ARCH_CMPXCHG
 #warning ACPI uses CMPXCHG, i486 and later hardware
@@ -187,6 +187,7 @@ static int __init acpi_parse_madt(struct
 		return -ENODEV;
 	}
 
+#ifndef CONFIG_XEN
 	if (madt->address) {
 		acpi_lapic_addr = (u64) madt->address;
 
@@ -194,7 +195,6 @@ static int __init acpi_parse_madt(struct
 		       madt->address);
 	}
 
-#ifndef CONFIG_XEN
 	default_acpi_madt_oem_check(madt->header.oem_id,
 				    madt->header.oem_table_id);
 #endif
@@ -300,6 +300,7 @@ static int __init
 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 			  const unsigned long end)
 {
+#ifndef CONFIG_XEN
 	struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
 
 	lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
@@ -308,6 +309,7 @@ acpi_parse_lapic_addr_ovr(struct acpi_su
 		return -EINVAL;
 
 	acpi_lapic_addr = lapic_addr_ovr->address;
+#endif
 
 	return 0;
 }
--- head-2011-03-11.orig/arch/x86/kernel/irq-xen.c	2011-02-02 15:09:43.000000000 +0100
+++ head-2011-03-11/arch/x86/kernel/irq-xen.c	2011-02-03 14:34:58.000000000 +0100
@@ -16,9 +16,9 @@
 #include <asm/mce.h>
 #include <asm/hw_irq.h>
 
+#ifndef CONFIG_XEN
 atomic_t irq_err_count;
 
-#ifndef CONFIG_XEN
 /* Function pointer for generic interrupt vector handling */
 void (*x86_platform_ipi_callback)(void) = NULL;
 #endif
@@ -58,7 +58,7 @@ static int show_other_interrupts(struct 
 	for_each_online_cpu(j)
 		seq_printf(p, "%10u ", irq_stats(j)->__nmi_count);
 	seq_printf(p, "  Non-maskable interrupts\n");
-#ifdef CONFIG_X86_LOCAL_APIC
+#if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_XEN)
 	seq_printf(p, "%*s: ", prec, "LOC");
 	for_each_online_cpu(j)
 		seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs);
@@ -128,10 +128,12 @@ static int show_other_interrupts(struct 
 		seq_printf(p, "%10u ", per_cpu(mce_poll_count, j));
 	seq_printf(p, "  Machine check polls\n");
 #endif
+#ifndef CONFIG_XEN
 	seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
 #if defined(CONFIG_X86_IO_APIC)
 	seq_printf(p, "%*s: %10u\n", prec, "MIS", atomic_read(&irq_mis_count));
 #endif
+#endif
 	return 0;
 }
 
@@ -229,12 +231,16 @@ u64 arch_irq_stat_cpu(unsigned int cpu)
 
 u64 arch_irq_stat(void)
 {
+#ifndef CONFIG_XEN
 	u64 sum = atomic_read(&irq_err_count);
 
 #ifdef CONFIG_X86_IO_APIC
 	sum += atomic_read(&irq_mis_count);
 #endif
 	return sum;
+#else
+	return 0;
+#endif
 }
 
 
--- head-2011-03-11.orig/drivers/xen/core/smpboot.c	2011-02-02 15:10:16.000000000 +0100
+++ head-2011-03-11/drivers/xen/core/smpboot.c	2011-03-03 16:50:49.000000000 +0100
@@ -283,7 +283,7 @@ void __init smp_prepare_cpus(unsigned in
 	 * Here we can be sure that there is an IO-APIC in the system. Let's
 	 * go and set it up:
 	 */
-	if (!skip_ioapic_setup && nr_ioapics)
+	if (cpu_has_apic && !skip_ioapic_setup && nr_ioapics)
 		setup_IO_APIC();
 #endif
 }