Merge tag 'x86_apic_for_6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 apic updates from Dave Hansen:
 "This includes a very thorough rework of the 'struct apic' handlers.
  Quite a variety of them popped up over the years, especially in the
  32-bit days when odd apics were much more in vogue.

  The end result speaks for itself, which is a removal of a ton of code
  and static calls to replace indirect calls.

  If there's any breakage here, it's likely to be around the 32-bit
  museum pieces that get light to no testing these days.

  Summary:

   - Rework apic callbacks, getting rid of unnecessary ones and
     coalescing lots of silly duplicates.

   - Use static_calls() instead of indirect calls for apic->foo()

   - Tons of cleanups an crap removal along the way"

* tag 'x86_apic_for_6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (64 commits)
  x86/apic: Turn on static calls
  x86/apic: Provide static call infrastructure for APIC callbacks
  x86/apic: Wrap IPI calls into helper functions
  x86/apic: Mark all hotpath APIC callback wrappers __always_inline
  x86/xen/apic: Mark apic __ro_after_init
  x86/apic: Convert other overrides to apic_update_callback()
  x86/apic: Replace acpi_wake_cpu_handler_update() and apic_set_eoi_cb()
  x86/apic: Provide apic_update_callback()
  x86/xen/apic: Use standard apic driver mechanism for Xen PV
  x86/apic: Provide common init infrastructure
  x86/apic: Wrap apic->native_eoi() into a helper
  x86/apic: Nuke ack_APIC_irq()
  x86/apic: Remove pointless arguments from [native_]eoi_write()
  x86/apic/noop: Tidy up the code
  x86/apic: Remove pointless NULL initializations
  x86/apic: Sanitize APIC ID range validation
  x86/apic: Prepare x2APIC for using apic::max_apic_id
  x86/apic: Simplify X2APIC ID validation
  x86/apic: Add max_apic_id member
  x86/apic: Wrap APIC ID validation into an inline
  ...

42 files changed, 641 insertions, 1159 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 53369c57751e..2a0ea38955df 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -170,7 +170,6 @@ static int __init acpi_parse_madt(struct acpi_table_header *table)
  */
 static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
 {
-	unsigned int ver = 0;
 	int cpu;
 
 	if (id >= MAX_LOCAL_APIC) {
@@ -183,10 +182,7 @@ static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
 		return -EINVAL;
 	}
 
-	if (boot_cpu_physical_apicid != -1U)
-		ver = boot_cpu_apic_version;
-
-	cpu = generic_processor_info(id, ver);
+	cpu = generic_processor_info(id);
 	if (cpu >= 0)
 		early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;
 
@@ -240,7 +236,7 @@ acpi_parse_x2apic(union acpi_subtable_headers *header, const unsigned long end)
 	 * to not preallocating memory for all NR_CPUS
 	 * when we use CPU hotplug.
 	 */
-	if (!apic->apic_id_valid(apic_id)) {
+	if (!apic_id_valid(apic_id)) {
 		if (enabled)
 			pr_warn("x2apic entry ignored\n");
 		return 0;
@@ -1182,7 +1178,7 @@ static int __init acpi_parse_mp_wake(union acpi_subtable_headers *header,
 
 	acpi_mp_wake_mailbox_paddr = mp_wake->base_address;
 
-	acpi_wake_cpu_handler_update(acpi_wakeup_cpu);
+	apic_update_callback(wakeup_secondary_cpu_64, acpi_wakeup_cpu);
 
 	return 0;
 }
@@ -1279,7 +1275,7 @@ static int __init acpi_parse_madt_ioapic_entries(void)
 	/*
 	 * if "noapic" boot option, don't look for IO-APICs
 	 */
-	if (skip_ioapic_setup) {
+	if (ioapic_is_disabled) {
 		pr_info("Skipping IOAPIC probe due to 'noapic' option.\n");
 		return -ENODEV;
 	}
diff --git a/arch/x86/kernel/apic/Makefile b/arch/x86/kernel/apic/Makefile
index a6fcaf16cdbf..2ee867d796d9 100644
--- a/arch/x86/kernel/apic/Makefile
+++ b/arch/x86/kernel/apic/Makefile
@@ -7,7 +7,7 @@
 # In particualr, smp_apic_timer_interrupt() is called in random places.
 KCOV_INSTRUMENT		:= n
 
-obj-$(CONFIG_X86_LOCAL_APIC)	+= apic.o apic_common.o apic_noop.o ipi.o vector.o
+obj-$(CONFIG_X86_LOCAL_APIC)	+= apic.o apic_common.o apic_noop.o ipi.o vector.o init.o
 obj-y				+= hw_nmi.o
 
 obj-$(CONFIG_X86_IO_APIC)	+= io_apic.o
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index af49e24b46a4..760adac3d1a8 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -63,6 +63,8 @@
 #include <asm/irq_regs.h>
 #include <asm/cpu.h>
 
+#include "local.h"
+
 unsigned int num_processors;
 
 unsigned disabled_cpus;
@@ -74,11 +76,6 @@ EXPORT_SYMBOL_GPL(boot_cpu_physical_apicid);
 u8 boot_cpu_apic_version __ro_after_init;
 
 /*
- * The highest APIC ID seen during enumeration.
- */
-static unsigned int max_physical_apicid;
-
-/*
  * Bitmask of physically existing CPUs:
  */
 physid_mask_t phys_cpu_present_map;
@@ -104,26 +101,20 @@ static bool virt_ext_dest_id __ro_after_init;
 /* For parallel bootup. */
 unsigned long apic_mmio_base __ro_after_init;
 
+static inline bool apic_accessible(void)
+{
+	return x2apic_mode || apic_mmio_base;
+}
+
 /*
  * Map cpu index to physical APIC ID
  */
 DEFINE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_cpu_to_apicid, BAD_APICID);
-DEFINE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid, BAD_APICID);
 DEFINE_EARLY_PER_CPU_READ_MOSTLY(u32, x86_cpu_to_acpiid, U32_MAX);
 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
-EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_acpiid);
 
 #ifdef CONFIG_X86_32
-
-/*
- * On x86_32, the mapping between cpu and logical apicid may vary
- * depending on apic in use.  The following early percpu variable is
- * used for the mapping.  This is where the behaviors of x86_64 and 32
- * actually diverge.  Let's keep it ugly for now.
- */
-DEFINE_EARLY_PER_CPU_READ_MOSTLY(int, x86_cpu_to_logical_apicid, BAD_APICID);
-
 /* Local APIC was disabled by the BIOS and enabled by the kernel */
 static int enabled_via_apicbase __ro_after_init;
 
@@ -179,8 +170,8 @@ static __init int setup_apicpmtimer(char *s)
 __setup("apicpmtimer", setup_apicpmtimer);
 #endif
 
-unsigned long mp_lapic_addr __ro_after_init;
-int disable_apic __ro_after_init;
+static unsigned long mp_lapic_addr __ro_after_init;
+bool apic_is_disabled __ro_after_init;
 /* Disable local APIC timer from the kernel commandline or via dmi quirk */
 static int disable_apic_timer __initdata;
 /* Local APIC timer works in C2 */
@@ -206,8 +197,6 @@ unsigned int lapic_timer_period = 0;
 
 static void apic_pm_activate(void);
 
-static unsigned long apic_phys __ro_after_init;
-
 /*
  * Get the LAPIC version
  */
@@ -247,31 +236,7 @@ static int modern_apic(void)
  */
 static void __init apic_disable(void)
 {
-	pr_info("APIC: switched to apic NOOP\n");
-	apic = &apic_noop;
-}
-
-void native_apic_wait_icr_idle(void)
-{
-	while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
-		cpu_relax();
-}
-
-u32 native_safe_apic_wait_icr_idle(void)
-{
-	u32 send_status;
-	int timeout;
-
-	timeout = 0;
-	do {
-		send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
-		if (!send_status)
-			break;
-		inc_irq_stat(icr_read_retry_count);
-		udelay(100);
-	} while (timeout++ < 1000);
-
-	return send_status;
+	apic_install_driver(&apic_noop);
 }
 
 void native_apic_icr_write(u32 low, u32 id)
@@ -537,7 +502,7 @@ static int lapic_timer_set_oneshot(struct clock_event_device *evt)
 static void lapic_timer_broadcast(const struct cpumask *mask)
 {
 #ifdef CONFIG_SMP
-	apic->send_IPI_mask(mask, LOCAL_TIMER_VECTOR);
+	__apic_send_IPI_mask(mask, LOCAL_TIMER_VECTOR);
 #endif
 }
 
@@ -810,7 +775,7 @@ bool __init apic_needs_pit(void)
 		return true;
 
 	/* Is there an APIC at all or is it disabled? */
-	if (!boot_cpu_has(X86_FEATURE_APIC) || disable_apic)
+	if (!boot_cpu_has(X86_FEATURE_APIC) || apic_is_disabled)
 		return true;
 
 	/*
@@ -1110,7 +1075,7 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_apic_timer_interrupt)
 {
 	struct pt_regs *old_regs = set_irq_regs(regs);
 
-	ack_APIC_irq();
+	apic_eoi();
 	trace_local_timer_entry(LOCAL_TIMER_VECTOR);
 	local_apic_timer_interrupt();
 	trace_local_timer_exit(LOCAL_TIMER_VECTOR);
@@ -1134,8 +1099,7 @@ void clear_local_APIC(void)
 	int maxlvt;
 	u32 v;
 
-	/* APIC hasn't been mapped yet */
-	if (!x2apic_mode && !apic_phys)
+	if (!apic_accessible())
 		return;
 
 	maxlvt = lapic_get_maxlvt();
@@ -1225,8 +1189,7 @@ void apic_soft_disable(void)
  */
 void disable_local_APIC(void)
 {
-	/* APIC hasn't been mapped yet */
-	if (!x2apic_mode && !apic_phys)
+	if (!apic_accessible())
 		return;
 
 	apic_soft_disable();
@@ -1299,7 +1262,7 @@ enum apic_intr_mode_id apic_intr_mode __ro_after_init;
 static int __init __apic_intr_mode_select(void)
 {
 	/* Check kernel option */
-	if (disable_apic) {
+	if (apic_is_disabled) {
 		pr_info("APIC disabled via kernel command line\n");
 		return APIC_PIC;
 	}
@@ -1308,7 +1271,7 @@ static int __init __apic_intr_mode_select(void)
 #ifdef CONFIG_X86_64
 	/* On 64-bit, the APIC must be integrated, Check local APIC only */
 	if (!boot_cpu_has(X86_FEATURE_APIC)) {
-		disable_apic = 1;
+		apic_is_disabled = true;
 		pr_info("APIC disabled by BIOS\n");
 		return APIC_PIC;
 	}
@@ -1317,16 +1280,15 @@ static int __init __apic_intr_mode_select(void)
 
 	/* Neither 82489DX nor integrated APIC ? */
 	if (!boot_cpu_has(X86_FEATURE_APIC) && !smp_found_config) {
-		disable_apic = 1;
+		apic_is_disabled = true;
 		return APIC_PIC;
 	}
 
 	/* If the BIOS pretends there is an integrated APIC ? */
 	if (!boot_cpu_has(X86_FEATURE_APIC) &&
 		APIC_INTEGRATED(boot_cpu_apic_version)) {
-		disable_apic = 1;
-		pr_err(FW_BUG "Local APIC %d not detected, force emulation\n",
-				       boot_cpu_physical_apicid);
+		apic_is_disabled = true;
+		pr_err(FW_BUG "Local APIC not detected, force emulation\n");
 		return APIC_PIC;
 	}
 #endif
@@ -1347,12 +1309,6 @@ static int __init __apic_intr_mode_select(void)
 		pr_info("APIC: SMP mode deactivated\n");
 		return APIC_SYMMETRIC_IO_NO_ROUTING;
 	}
-
-	if (read_apic_id() != boot_cpu_physical_apicid) {
-		panic("Boot APIC ID in local APIC unexpected (%d vs %d)",
-		     read_apic_id(), boot_cpu_physical_apicid);
-		/* Or can we switch back to PIC here? */
-	}
 #endif
 
 	return APIC_SYMMETRIC_IO;
@@ -1439,7 +1395,9 @@ void __init apic_intr_mode_init(void)
 		break;
 	}
 
-	default_setup_apic_routing();
+	x86_64_probe_apic();
+
+	x86_32_install_bigsmp();
 
 	if (x86_platform.apic_post_init)
 		x86_platform.apic_post_init();
@@ -1521,7 +1479,7 @@ static bool apic_check_and_ack(union apic_ir *irr, union apic_ir *isr)
 		 * per set bit.
 		 */
 		for_each_set_bit(bit, isr->map, APIC_IR_BITS)
-			ack_APIC_irq();
+			apic_eoi();
 		return true;
 	}
 
@@ -1533,7 +1491,7 @@ static bool apic_check_and_ack(union apic_ir *irr, union apic_ir *isr)
  * interrupt from previous kernel might still have ISR bit set.
  *
  * Most probably by now the CPU has serviced that pending interrupt and it
- * might not have done the ack_APIC_irq() because it thought, interrupt
+ * might not have done the apic_eoi() because it thought, interrupt
  * came from i8259 as ExtInt. LAPIC did not get EOI so it does not clear
  * the ISR bit and cpu thinks it has already serviced the interrupt. Hence
  * a vector might get locked. It was noticed for timer irq (vector
@@ -1567,7 +1525,7 @@ static void setup_local_APIC(void)
 	int cpu = smp_processor_id();
 	unsigned int value;
 
-	if (disable_apic) {
+	if (apic_is_disabled) {
 		disable_ioapic_support();
 		return;
 	}
@@ -1589,36 +1547,18 @@ static void setup_local_APIC(void)
 		apic_write(APIC_ESR, 0);
 	}
 #endif
-	/*
-	 * Double-check whether this APIC is really registered.
-	 * This is meaningless in clustered apic mode, so we skip it.
-	 */
-	BUG_ON(!apic->apic_id_registered());
+	/* Validate that the APIC is registered if required */
+	BUG_ON(apic->apic_id_registered && !apic->apic_id_registered());
 
 	/*
 	 * Intel recommends to set DFR, LDR and TPR before enabling
 	 * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
-	 * document number 292116).  So here it goes...
+	 * document number 292116).
+	 *
+	 * Except for APICs which operate in physical destination mode.
 	 */
-	apic->init_apic_ldr();
-
-#ifdef CONFIG_X86_32
-	if (apic->dest_mode_logical) {
-		int logical_apicid, ldr_apicid;
-
-		/*
-		 * APIC LDR is initialized.  If logical_apicid mapping was
-		 * initialized during get_smp_config(), make sure it matches
-		 * the actual value.
-		 */
-		logical_apicid = early_per_cpu(x86_cpu_to_logical_apicid, cpu);
-		ldr_apicid = GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
-		if (logical_apicid != BAD_APICID)
-			WARN_ON(logical_apicid != ldr_apicid);
-		/* Always use the value from LDR. */
-		early_per_cpu(x86_cpu_to_logical_apicid, cpu) = ldr_apicid;
-	}
-#endif
+	if (apic->init_apic_ldr)
+		apic->init_apic_ldr();
 
 	/*
 	 * Set Task Priority to 'accept all except vectors 0-31'.  An APIC
@@ -1691,7 +1631,7 @@ static void setup_local_APIC(void)
 	 * TODO: set up through-local-APIC from through-I/O-APIC? --macro
 	 */
 	value = apic_read(APIC_LVT0) & APIC_LVT_MASKED;
-	if (!cpu && (pic_mode || !value || skip_ioapic_setup)) {
+	if (!cpu && (pic_mode || !value || ioapic_is_disabled)) {
 		value = APIC_DM_EXTINT;
 		apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n", cpu);
 	} else {
@@ -1748,6 +1688,25 @@ void apic_ap_setup(void)
 	end_local_APIC_setup();
 }
 
+static __init void cpu_set_boot_apic(void);
+
+static __init void apic_read_boot_cpu_id(bool x2apic)
+{
+	/*
+	 * This can be invoked from check_x2apic() before the APIC has been
+	 * selected. But that code knows for sure that the BIOS enabled
+	 * X2APIC.
+	 */
+	if (x2apic) {
+		boot_cpu_physical_apicid = native_apic_msr_read(APIC_ID);
+		boot_cpu_apic_version = GET_APIC_VERSION(native_apic_msr_read(APIC_LVR));
+	} else {
+		boot_cpu_physical_apicid = read_apic_id();
+		boot_cpu_apic_version = GET_APIC_VERSION(apic_read(APIC_LVR));
+	}
+	cpu_set_boot_apic();
+}
+
 #ifdef CONFIG_X86_X2APIC
 int x2apic_mode;
 EXPORT_SYMBOL_GPL(x2apic_mode);
@@ -1847,6 +1806,8 @@ void x2apic_setup(void)
 	__x2apic_enable();
 }
 
+static __init void apic_set_fixmap(void);
+
 static __init void x2apic_disable(void)
 {
 	u32 x2apic_id, state = x2apic_state;
@@ -1867,7 +1828,7 @@ static __init void x2apic_disable(void)
 	}
 
 	__x2apic_disable();
-	register_lapic_address(mp_lapic_addr);
+	apic_set_fixmap();
 }
 
 static __init void x2apic_enable(void)
@@ -1928,6 +1889,7 @@ void __init check_x2apic(void)
 			x2apic_state = X2APIC_ON_LOCKED;
 		else
 			x2apic_state = X2APIC_ON;
+		apic_read_boot_cpu_id(true);
 	} else if (!boot_cpu_has(X86_FEATURE_X2APIC)) {
 		x2apic_state = X2APIC_DISABLED;
 	}
@@ -1943,7 +1905,7 @@ void __init check_x2apic(void)
 	pr_err("Kernel does not support x2APIC, please recompile with CONFIG_X86_X2APIC.\n");
 	pr_err("Disabling APIC, expect reduced performance and functionality.\n");
 
-	disable_apic = 1;
+	apic_is_disabled = true;
 	setup_clear_cpu_cap(X86_FEATURE_APIC);
 }
 
@@ -1956,7 +1918,7 @@ void __init enable_IR_x2apic(void)
 	unsigned long flags;
 	int ret, ir_stat;
 
-	if (skip_ioapic_setup) {
+	if (ioapic_is_disabled) {
 		pr_info("Not enabling interrupt remapping due to skipped IO-APIC setup\n");
 		return;
 	}
@@ -1994,19 +1956,19 @@ void __init enable_IR_x2apic(void)
  * On AMD64 we trust the BIOS - if it says no APIC it is likely
  * not correctly set up (usually the APIC timer won't work etc.)
  */
-static int __init detect_init_APIC(void)
+static bool __init detect_init_APIC(void)
 {
 	if (!boot_cpu_has(X86_FEATURE_APIC)) {
 		pr_info("No local APIC present\n");
-		return -1;
+		return false;
 	}
 
-	mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
-	return 0;
+	register_lapic_address(APIC_DEFAULT_PHYS_BASE);
+	return true;
 }
 #else
 
-static int __init apic_verify(void)
+static bool __init apic_verify(unsigned long addr)
 {
 	u32 features, h, l;
 
@@ -2017,28 +1979,28 @@ static int __init apic_verify(void)
 	features = cpuid_edx(1);
 	if (!(features & (1 << X86_FEATURE_APIC))) {
 		pr_warn("Could not enable APIC!\n");
-		return -1;
+		return false;
 	}
 	set_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
-	mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 
 	/* The BIOS may have set up the APIC at some other address */
 	if (boot_cpu_data.x86 >= 6) {
 		rdmsr(MSR_IA32_APICBASE, l, h);
 		if (l & MSR_IA32_APICBASE_ENABLE)
-			mp_lapic_addr = l & MSR_IA32_APICBASE_BASE;
+			addr = l & MSR_IA32_APICBASE_BASE;
 	}
 
+	register_lapic_address(addr);
 	pr_info("Found and enabled local APIC!\n");
-	return 0;
+	return true;
 }
 
-int __init apic_force_enable(unsigned long addr)
+bool __init apic_force_enable(unsigned long addr)
 {
 	u32 h, l;
 
-	if (disable_apic)
-		return -1;
+	if (apic_is_disabled)
+		return false;
 
 	/*
 	 * Some BIOSes disable the local APIC in the APIC_BASE
@@ -2055,17 +2017,17 @@ int __init apic_force_enable(unsigned long addr)
 			enabled_via_apicbase = 1;
 		}
 	}
-	return apic_verify();
+	return apic_verify(addr);
 }
 
 /*
  * Detect and initialize APIC
  */
-static int __init detect_init_APIC(void)
+static bool __init detect_init_APIC(void)
 {
 	/* Disabled by kernel option? */
-	if (disable_apic)
-		return -1;
+	if (apic_is_disabled)
+		return false;
 
 	switch (boot_cpu_data.x86_vendor) {
 	case X86_VENDOR_AMD:
@@ -2092,22 +2054,22 @@ static int __init detect_init_APIC(void)
 		if (!force_enable_local_apic) {
 			pr_info("Local APIC disabled by BIOS -- "
 				"you can enable it with \"lapic\"\n");
-			return -1;
+			return false;
 		}
-		if (apic_force_enable(APIC_DEFAULT_PHYS_BASE))
-			return -1;
+		if (!apic_force_enable(APIC_DEFAULT_PHYS_BASE))
+			return false;
 	} else {
-		if (apic_verify())
-			return -1;
+		if (!apic_verify(APIC_DEFAULT_PHYS_BASE))
+			return false;
 	}
 
 	apic_pm_activate();
 
-	return 0;
+	return true;
 
 no_apic:
 	pr_info("No local APIC present or hardware disabled\n");
-	return -1;
+	return false;
 }
 #endif
 
@@ -2116,64 +2078,38 @@ no_apic:
  */
 void __init init_apic_mappings(void)
 {
-	unsigned int new_apicid;
-
 	if (apic_validate_deadline_timer())
 		pr_info("TSC deadline timer available\n");
 
-	if (x2apic_mode) {
-		boot_cpu_physical_apicid = read_apic_id();
+	if (x2apic_mode)
 		return;
-	}
 
-	/* If no local APIC can be found return early */
-	if (!smp_found_config && detect_init_APIC()) {
-		/* lets NOP'ify apic operations */
-		pr_info("APIC: disable apic facility\n");
-		apic_disable();
-	} else {
-		apic_phys = mp_lapic_addr;
-
-		/*
-		 * If the system has ACPI MADT tables or MP info, the LAPIC
-		 * address is already registered.
-		 */
-		if (!acpi_lapic && !smp_found_config)
-			register_lapic_address(apic_phys);
+	if (!smp_found_config) {
+		if (!detect_init_APIC()) {
+			pr_info("APIC: disable apic facility\n");
+			apic_disable();
+		}
+		num_processors = 1;
 	}
+}
 
-	/*
-	 * Fetch the APIC ID of the BSP in case we have a
-	 * default configuration (or the MP table is broken).
-	 */
-	new_apicid = read_apic_id();
-	if (boot_cpu_physical_apicid != new_apicid) {
-		boot_cpu_physical_apicid = new_apicid;
-		/*
-		 * yeah -- we lie about apic_version
-		 * in case if apic was disabled via boot option
-		 * but it's not a problem for SMP compiled kernel
-		 * since apic_intr_mode_select is prepared for such
-		 * a case and disable smp mode
-		 */
-		boot_cpu_apic_version = GET_APIC_VERSION(apic_read(APIC_LVR));
-	}
+static __init void apic_set_fixmap(void)
+{
+	set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
+	apic_mmio_base = APIC_BASE;
+	apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
+		    apic_mmio_base, mp_lapic_addr);
+	apic_read_boot_cpu_id(false);
 }
 
 void __init register_lapic_address(unsigned long address)
 {
+	/* This should only happen once */
+	WARN_ON_ONCE(mp_lapic_addr);
 	mp_lapic_addr = address;
 
-	if (!x2apic_mode) {
-		set_fixmap_nocache(FIX_APIC_BASE, address);
-		apic_mmio_base = APIC_BASE;
-		apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
-			    APIC_BASE, address);
-	}
-	if (boot_cpu_physical_apicid == -1U) {
-		boot_cpu_physical_apicid  = read_apic_id();
-		boot_cpu_apic_version = GET_APIC_VERSION(apic_read(APIC_LVR));
-	}
+	if (!x2apic_mode)
+		apic_set_fixmap();
 }
 
 /*
@@ -2210,7 +2146,7 @@ static noinline void handle_spurious_interrupt(u8 vector)
 	if (v & (1 << (vector & 0x1f))) {
 		pr_info("Spurious interrupt (vector 0x%02x) on CPU#%d. Acked\n",
 			vector, smp_processor_id());
-		ack_APIC_irq();
+		apic_eoi();
 	} else {
 		pr_info("Spurious interrupt (vector 0x%02x) on CPU#%d. Not pending!\n",
 			vector, smp_processor_id());
@@ -2261,7 +2197,7 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_error_interrupt)
 	if (lapic_get_maxlvt() > 3)	/* Due to the Pentium erratum 3AP. */
 		apic_write(APIC_ESR, 0);
 	v = apic_read(APIC_ESR);
-	ack_APIC_irq();
+	apic_eoi();
 	atomic_inc(&irq_err_count);
 
 	apic_printk(APIC_DEBUG, KERN_DEBUG "APIC error on CPU%d: %02x",
@@ -2446,54 +2382,43 @@ static int allocate_logical_cpuid(int apicid)
 	return nr_logical_cpuids++;
 }
 
-int generic_processor_info(int apicid, int version)
+static void cpu_update_apic(int cpu, int apicid)
 {
-	int cpu, max = nr_cpu_ids;
-	bool boot_cpu_detected = physid_isset(boot_cpu_physical_apicid,
-				phys_cpu_present_map);
+#if defined(CONFIG_SMP) || defined(CONFIG_X86_64)
+	early_per_cpu(x86_cpu_to_apicid, cpu) = apicid;
+#endif
+	set_cpu_possible(cpu, true);
+	physid_set(apicid, phys_cpu_present_map);
+	set_cpu_present(cpu, true);
+	num_processors++;
 
-	/*
-	 * boot_cpu_physical_apicid is designed to have the apicid
-	 * returned by read_apic_id(), i.e, the apicid of the
-	 * currently booting-up processor. However, on some platforms,
-	 * it is temporarily modified by the apicid reported as BSP
-	 * through MP table. Concretely:
-	 *
-	 * - arch/x86/kernel/mpparse.c: MP_processor_info()
-	 * - arch/x86/mm/amdtopology.c: amd_numa_init()
-	 *
-	 * This function is executed with the modified
-	 * boot_cpu_physical_apicid. So, disabled_cpu_apicid kernel
-	 * parameter doesn't work to disable APs on kdump 2nd kernel.
-	 *
-	 * Since fixing handling of boot_cpu_physical_apicid requires
-	 * another discussion and tests on each platform, we leave it
-	 * for now and here we use read_apic_id() directly in this
-	 * function, generic_processor_info().
-	 */
-	if (disabled_cpu_apicid != BAD_APICID &&
-	    disabled_cpu_apicid != read_apic_id() &&
-	    disabled_cpu_apicid == apicid) {
-		int thiscpu = num_processors + disabled_cpus;
+	if (system_state != SYSTEM_BOOTING)
+		cpu_mark_primary_thread(cpu, apicid);
+}
 
-		pr_warn("APIC: Disabling requested cpu."
-			" Processor %d/0x%x ignored.\n", thiscpu, apicid);
+static __init void cpu_set_boot_apic(void)
+{
+	cpuid_to_apicid[0] = boot_cpu_physical_apicid;
+	cpu_update_apic(0, boot_cpu_physical_apicid);
+	x86_32_probe_bigsmp_early();
+}
 
-		disabled_cpus++;
-		return -ENODEV;
-	}
+int generic_processor_info(int apicid)
+{
+	int cpu, max = nr_cpu_ids;
 
-	/*
-	 * If boot cpu has not been detected yet, then only allow upto
-	 * nr_cpu_ids - 1 processors and keep one slot free for boot cpu
-	 */
-	if (!boot_cpu_detected && num_processors >= nr_cpu_ids - 1 &&
-	    apicid != boot_cpu_physical_apicid) {
-		int thiscpu = max + disabled_cpus - 1;
+	/* The boot CPU must be set before MADT/MPTABLE parsing happens */
+	if (cpuid_to_apicid[0] == BAD_APICID)
+		panic("Boot CPU APIC not registered yet\n");
 
-		pr_warn("APIC: NR_CPUS/possible_cpus limit of %i almost"
-			" reached. Keeping one slot for boot cpu."
-			"  Processor %d/0x%x ignored.\n", max, thiscpu, apicid);
+	if (apicid == boot_cpu_physical_apicid)
+		return 0;
+
+	if (disabled_cpu_apicid == apicid) {
+		int thiscpu = num_processors + disabled_cpus;
+
+		pr_warn("APIC: Disabling requested cpu. Processor %d/0x%x ignored.\n",
+			thiscpu, apicid);
 
 		disabled_cpus++;
 		return -ENODEV;
@@ -2509,66 +2434,16 @@ int generic_processor_info(int apicid, int version)
 		return -EINVAL;
 	}
 
-	if (apicid == boot_cpu_physical_apicid) {
-		/*
-		 * x86_bios_cpu_apicid is required to have processors listed
-		 * in same order as logical cpu numbers. Hence the first
-		 * entry is BSP, and so on.
-		 * boot_cpu_init() already hold bit 0 in cpu_present_mask
-		 * for BSP.
-		 */
-		cpu = 0;
-
-		/* Logical cpuid 0 is reserved for BSP. */
-		cpuid_to_apicid[0] = apicid;
-	} else {
-		cpu = allocate_logical_cpuid(apicid);
-		if (cpu < 0) {
-			disabled_cpus++;
-			return -EINVAL;
-		}
-	}
-
-	/*
-	 * Validate version
-	 */
-	if (version == 0x0) {
-		pr_warn("BIOS bug: APIC version is 0 for CPU %d/0x%x, fixing up to 0x10\n",
-			cpu, apicid);
-		version = 0x10;
-	}
-
-	if (version != boot_cpu_apic_version) {
-		pr_warn("BIOS bug: APIC version mismatch, boot CPU: %x, CPU %d: version %x\n",
-			boot_cpu_apic_version, cpu, version);
+	cpu = allocate_logical_cpuid(apicid);
+	if (cpu < 0) {
+		disabled_cpus++;
+		return -EINVAL;
 	}
 
-	if (apicid > max_physical_apicid)
-		max_physical_apicid = apicid;
-
-#if defined(CONFIG_SMP) || defined(CONFIG_X86_64)
-	early_per_cpu(x86_cpu_to_apicid, cpu) = apicid;
-	early_per_cpu(x86_bios_cpu_apicid, cpu) = apicid;
-#endif
-#ifdef CONFIG_X86_32
-	early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
-		apic->x86_32_early_logical_apicid(cpu);
-#endif
-	set_cpu_possible(cpu, true);
-	physid_set(apicid, phys_cpu_present_map);
-	set_cpu_present(cpu, true);
-	num_processors++;
-
-	if (system_state != SYSTEM_BOOTING)
-		cpu_mark_primary_thread(cpu, apicid);
-
+	cpu_update_apic(cpu, apicid);
 	return cpu;
 }
 
-int hard_smp_processor_id(void)
-{
-	return read_apic_id();
-}
 
 void __irq_msi_compose_msg(struct irq_cfg *cfg, struct msi_msg *msg,
 			   bool dmar)
@@ -2610,47 +2485,10 @@ u32 x86_msi_msg_get_destid(struct msi_msg *msg, bool extid)
 }
 EXPORT_SYMBOL_GPL(x86_msi_msg_get_destid);
 
-#ifdef CONFIG_X86_64
-void __init acpi_wake_cpu_handler_update(wakeup_cpu_handler handler)
-{
-	struct apic **drv;
-
-	for (drv = __apicdrivers; drv < __apicdrivers_end; drv++)
-		(*drv)->wakeup_secondary_cpu_64 = handler;
-}
-#endif
-
-/*
- * Override the generic EOI implementation with an optimized version.
- * Only called during early boot when only one CPU is active and with
- * interrupts disabled, so we know this does not race with actual APIC driver
- * use.
- */
-void __init apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v))
-{
-	struct apic **drv;
-
-	for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
-		/* Should happen once for each apic */
-		WARN_ON((*drv)->eoi_write == eoi_write);
-		(*drv)->native_eoi_write = (*drv)->eoi_write;
-		(*drv)->eoi_write = eoi_write;
-	}
-}
-
 static void __init apic_bsp_up_setup(void)
 {
 #ifdef CONFIG_X86_64
 	apic_write(APIC_ID, apic->set_apic_id(boot_cpu_physical_apicid));
-#else
-	/*
-	 * Hack: In case of kdump, after a crash, kernel might be booting
-	 * on a cpu with non-zero lapic id. But boot_cpu_physical_apicid
-	 * might be zero if read from MP tables. Get it from LAPIC.
-	 */
-# ifdef CONFIG_CRASH_DUMP
-	boot_cpu_physical_apicid = read_apic_id();
-# endif
 #endif
 	physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
 }
@@ -2919,7 +2757,7 @@ int apic_is_clustered_box(void)
  */
 static int __init setup_disableapic(char *arg)
 {
-	disable_apic = 1;
+	apic_is_disabled = true;
 	setup_clear_cpu_cap(X86_FEATURE_APIC);
 	return 0;
 }
@@ -2956,11 +2794,11 @@ early_param("nolapic_timer", parse_nolapic_timer);
 static int __init apic_set_verbosity(char *arg)
 {
 	if (!arg)  {
-#ifdef CONFIG_X86_64
-		skip_ioapic_setup = 0;
+		if (IS_ENABLED(CONFIG_X86_32))
+			return -EINVAL;
+
+		ioapic_is_disabled = false;
 		return 0;
-#endif
-		return -EINVAL;
 	}
 
 	if (strcmp("debug", arg) == 0)
@@ -2981,11 +2819,11 @@ early_param("apic", apic_set_verbosity);
 
 static int __init lapic_insert_resource(void)
 {
-	if (!apic_phys)
+	if (!apic_mmio_base)
 		return -1;
 
 	/* Put local APIC into the resource map. */
-	lapic_resource.start = apic_phys;
+	lapic_resource.start = apic_mmio_base;
 	lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1;
 	insert_resource(&iomem_resource, &lapic_resource);
 
diff --git a/arch/x86/kernel/apic/apic_common.c b/arch/x86/kernel/apic/apic_common.c
index 02b4839478b1..7bc5d9bf59cd 100644
--- a/arch/x86/kernel/apic/apic_common.c
+++ b/arch/x86/kernel/apic/apic_common.c
@@ -6,6 +6,8 @@
 #include <linux/irq.h>
 #include <asm/apic.h>
 
+#include "local.h"
+
 u32 apic_default_calc_apicid(unsigned int cpu)
 {
 	return per_cpu(x86_cpu_to_apicid, cpu);
@@ -29,18 +31,27 @@ void default_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
 int default_cpu_present_to_apicid(int mps_cpu)
 {
 	if (mps_cpu < nr_cpu_ids && cpu_present(mps_cpu))
-		return (int)per_cpu(x86_bios_cpu_apicid, mps_cpu);
+		return (int)per_cpu(x86_cpu_to_apicid, mps_cpu);
 	else
 		return BAD_APICID;
 }
 EXPORT_SYMBOL_GPL(default_cpu_present_to_apicid);
 
-int default_check_phys_apicid_present(int phys_apicid)
+bool default_apic_id_registered(void)
 {
-	return physid_isset(phys_apicid, phys_cpu_present_map);
+	return physid_isset(read_apic_id(), phys_cpu_present_map);
 }
 
-int default_apic_id_valid(u32 apicid)
+/*
+ * Set up the logical destination ID when the APIC operates in logical
+ * destination mode.
+ */
+void default_init_apic_ldr(void)
 {
-	return (apicid < 255);
+	unsigned long val;
+
+	apic_write(APIC_DFR, APIC_DFR_FLAT);
+	val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
+	val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
+	apic_write(APIC_LDR, val);
 }
diff --git a/arch/x86/kernel/apic/apic_flat_64.c b/arch/x86/kernel/apic/apic_flat_64.c
index 8f72b4351c9f..032a84e2c3cc 100644
--- a/arch/x86/kernel/apic/apic_flat_64.c
+++ b/arch/x86/kernel/apic/apic_flat_64.c
@@ -28,26 +28,6 @@ static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 	return 1;
 }
 
-/*
- * Set up the logical destination ID.
- *
- * Intel recommends to set DFR, LDR and TPR before enabling
- * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
- * document number 292116).  So here it goes...
- */
-void flat_init_apic_ldr(void)
-{
-	unsigned long val;
-	unsigned long num, id;
-
-	num = smp_processor_id();
-	id = 1UL << num;
-	apic_write(APIC_DFR, APIC_DFR_FLAT);
-	val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
-	val |= SET_APIC_LOGICAL_ID(id);
-	apic_write(APIC_LDR, val);
-}
-
 static void _flat_send_IPI_mask(unsigned long mask, int vector)
 {
 	unsigned long flags;
@@ -86,16 +66,6 @@ static u32 set_apic_id(unsigned int id)
 	return (id & 0xFF) << 24;
 }
 
-static unsigned int read_xapic_id(void)
-{
-	return flat_get_apic_id(apic_read(APIC_ID));
-}
-
-static int flat_apic_id_registered(void)
-{
-	return physid_isset(read_xapic_id(), phys_cpu_present_map);
-}
-
 static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
 {
 	return initial_apic_id >> index_msb;
@@ -110,23 +80,18 @@ static struct apic apic_flat __ro_after_init = {
 	.name				= "flat",
 	.probe				= flat_probe,
 	.acpi_madt_oem_check		= flat_acpi_madt_oem_check,
-	.apic_id_valid			= default_apic_id_valid,
-	.apic_id_registered		= flat_apic_id_registered,
+	.apic_id_registered		= default_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= true,
 
 	.disable_esr			= 0,
 
-	.check_apicid_used		= NULL,
-	.init_apic_ldr			= flat_init_apic_ldr,
-	.ioapic_phys_id_map		= NULL,
-	.setup_apic_routing		= NULL,
+	.init_apic_ldr			= default_init_apic_ldr,
 	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
-	.apicid_to_cpu_present		= NULL,
-	.check_phys_apicid_present	= default_check_phys_apicid_present,
 	.phys_pkg_id			= flat_phys_pkg_id,
 
+	.max_apic_id			= 0xFE,
 	.get_apic_id			= flat_get_apic_id,
 	.set_apic_id			= set_apic_id,
 
@@ -139,15 +104,13 @@ static struct apic apic_flat __ro_after_init = {
 	.send_IPI_all			= default_send_IPI_all,
 	.send_IPI_self			= default_send_IPI_self,
 
-	.inquire_remote_apic		= default_inquire_remote_apic,
-
 	.read				= native_apic_mem_read,
 	.write				= native_apic_mem_write,
-	.eoi_write			= native_apic_mem_write,
+	.eoi				= native_apic_mem_eoi,
 	.icr_read			= native_apic_icr_read,
 	.icr_write			= native_apic_icr_write,
-	.wait_icr_idle			= native_apic_wait_icr_idle,
-	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
+	.wait_icr_idle			= apic_mem_wait_icr_idle,
+	.safe_wait_icr_idle		= apic_mem_wait_icr_idle_timeout,
 };
 
 /*
@@ -178,22 +141,9 @@ static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 	return 0;
 }
 
-static void physflat_init_apic_ldr(void)
-{
-	/*
-	 * LDR and DFR are not involved in physflat mode, rather:
-	 * "In physical destination mode, the destination processor is
-	 * specified by its local APIC ID [...]." (Intel SDM, 10.6.2.1)
-	 */
-}
-
 static int physflat_probe(void)
 {
-	if (apic == &apic_physflat || num_possible_cpus() > 8 ||
-	    jailhouse_paravirt())
-		return 1;
-
-	return 0;
+	return apic == &apic_physflat || num_possible_cpus() > 8 || jailhouse_paravirt();
 }
 
 static struct apic apic_physflat __ro_after_init = {
@@ -201,8 +151,7 @@ static struct apic apic_physflat __ro_after_init = {
 	.name				= "physical flat",
 	.probe				= physflat_probe,
 	.acpi_madt_oem_check		= physflat_acpi_madt_oem_check,
-	.apic_id_valid			= default_apic_id_valid,
-	.apic_id_registered		= flat_apic_id_registered,
+	.apic_id_registered		= default_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,
@@ -210,14 +159,11 @@ static struct apic apic_physflat __ro_after_init = {
 	.disable_esr			= 0,
 
 	.check_apicid_used		= NULL,
-	.init_apic_ldr			= physflat_init_apic_ldr,
 	.ioapic_phys_id_map		= NULL,
-	.setup_apic_routing		= NULL,
 	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
-	.apicid_to_cpu_present		= NULL,
-	.check_phys_apicid_present	= default_check_phys_apicid_present,
 	.phys_pkg_id			= flat_phys_pkg_id,
 
+	.max_apic_id			= 0xFE,
 	.get_apic_id			= flat_get_apic_id,
 	.set_apic_id			= set_apic_id,
 
@@ -230,15 +176,13 @@ static struct apic apic_physflat __ro_after_init = {
 	.send_IPI_all			= default_send_IPI_all,
 	.send_IPI_self			= default_send_IPI_self,
 
-	.inquire_remote_apic		= default_inquire_remote_apic,
-
 	.read				= native_apic_mem_read,
 	.write				= native_apic_mem_write,
-	.eoi_write			= native_apic_mem_write,
+	.eoi				= native_apic_mem_eoi,
 	.icr_read			= native_apic_icr_read,
 	.icr_write			= native_apic_icr_write,
-	.wait_icr_idle			= native_apic_wait_icr_idle,
-	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
+	.wait_icr_idle			= apic_mem_wait_icr_idle,
+	.safe_wait_icr_idle		= apic_mem_wait_icr_idle_timeout,
 };
 
 /*
diff --git a/arch/x86/kernel/apic/apic_noop.c b/arch/x86/kernel/apic/apic_noop.c
index fe78319e0f7a..966d7cf10b95 100644
--- a/arch/x86/kernel/apic/apic_noop.c
+++ b/arch/x86/kernel/apic/apic_noop.c
@@ -8,92 +8,42 @@
  * Though in case if apic is disabled (for some reason) we try
  * to not uglify the caller's code and allow to call (some) apic routines
  * like self-ipi, etc...
+ *
+ * FIXME: Remove this gunk. The above argument which was intentionally left
+ * in place is silly to begin with because none of the callbacks except for
+ * APIC::read/write() have a WARN_ON_ONCE() in them. Sigh...
  */
 #include <linux/cpumask.h>
 #include <linux/thread_info.h>
 
 #include <asm/apic.h>
 
-static void noop_init_apic_ldr(void) { }
 static void noop_send_IPI(int cpu, int vector) { }
 static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector) { }
 static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) { }
 static void noop_send_IPI_allbutself(int vector) { }
 static void noop_send_IPI_all(int vector) { }
 static void noop_send_IPI_self(int vector) { }
-static void noop_apic_wait_icr_idle(void) { }
 static void noop_apic_icr_write(u32 low, u32 id) { }
-
-static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip)
-{
-	return -1;
-}
-
-static u32 noop_safe_apic_wait_icr_idle(void)
-{
-	return 0;
-}
-
-static u64 noop_apic_icr_read(void)
-{
-	return 0;
-}
-
-static int noop_phys_pkg_id(int cpuid_apic, int index_msb)
-{
-	return 0;
-}
-
-static unsigned int noop_get_apic_id(unsigned long x)
-{
-	return 0;
-}
-
-static int noop_probe(void)
-{
-	/*
-	 * NOOP apic should not ever be
-	 * enabled via probe routine
-	 */
-	return 0;
-}
-
-static int noop_apic_id_registered(void)
-{
-	/*
-	 * if we would be really "pedantic"
-	 * we should pass read_apic_id() here
-	 * but since NOOP suppose APIC ID = 0
-	 * lets save a few cycles
-	 */
-	return physid_isset(0, phys_cpu_present_map);
-}
+static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip) { return -1; }
+static u64 noop_apic_icr_read(void) { return 0; }
+static int noop_phys_pkg_id(int cpuid_apic, int index_msb) { return 0; }
+static unsigned int noop_get_apic_id(unsigned long x) { return 0; }
+static void noop_apic_eoi(void) { }
 
 static u32 noop_apic_read(u32 reg)
 {
-	WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
+	WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !apic_is_disabled);
 	return 0;
 }
 
-static void noop_apic_write(u32 reg, u32 v)
-{
-	WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
-}
-
-#ifdef CONFIG_X86_32
-static int noop_x86_32_early_logical_apicid(int cpu)
+static void noop_apic_write(u32 reg, u32 val)
 {
-	return BAD_APICID;
+	WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !apic_is_disabled);
 }
-#endif
 
 struct apic apic_noop __ro_after_init = {
 	.name				= "noop",
-	.probe				= noop_probe,
-	.acpi_madt_oem_check		= NULL,
-
-	.apic_id_valid			= default_apic_id_valid,
-	.apic_id_registered		= noop_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= true,
@@ -101,18 +51,13 @@ struct apic apic_noop __ro_after_init = {
 	.disable_esr			= 0,
 
 	.check_apicid_used		= default_check_apicid_used,
-	.init_apic_ldr			= noop_init_apic_ldr,
 	.ioapic_phys_id_map		= default_ioapic_phys_id_map,
-	.setup_apic_routing		= NULL,
 	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
-	.apicid_to_cpu_present		= physid_set_mask_of_physid,
-
-	.check_phys_apicid_present	= default_check_phys_apicid_present,
 
 	.phys_pkg_id			= noop_phys_pkg_id,
 
+	.max_apic_id			= 0xFE,
 	.get_apic_id			= noop_get_apic_id,
-	.set_apic_id			= NULL,
 
 	.calc_dest_apicid		= apic_flat_calc_apicid,
 
@@ -125,17 +70,9 @@ struct apic apic_noop __ro_after_init = {
 
 	.wakeup_secondary_cpu		= noop_wakeup_secondary_cpu,
 
-	.inquire_remote_apic		= NULL,
-
 	.read				= noop_apic_read,
 	.write				= noop_apic_write,
-	.eoi_write			= noop_apic_write,
+	.eoi				= noop_apic_eoi,
 	.icr_read			= noop_apic_icr_read,
 	.icr_write			= noop_apic_icr_write,
-	.wait_icr_idle			= noop_apic_wait_icr_idle,
-	.safe_wait_icr_idle		= noop_safe_apic_wait_icr_idle,
-
-#ifdef CONFIG_X86_32
-	.x86_32_early_logical_apicid	= noop_x86_32_early_logical_apicid,
-#endif
 };
diff --git a/arch/x86/kernel/apic/apic_numachip.c b/arch/x86/kernel/apic/apic_numachip.c
index a54d817eb4b6..63f3d7be9dc7 100644
--- a/arch/x86/kernel/apic/apic_numachip.c
+++ b/arch/x86/kernel/apic/apic_numachip.c
@@ -56,17 +56,6 @@ static u32 numachip2_set_apic_id(unsigned int id)
 	return id << 24;
 }
 
-static int numachip_apic_id_valid(u32 apicid)
-{
-	/* Trust what bootloader passes in MADT */
-	return 1;
-}
-
-static int numachip_apic_id_registered(void)
-{
-	return 1;
-}
-
 static int numachip_phys_pkg_id(int initial_apic_id, int index_msb)
 {
 	return initial_apic_id >> index_msb;
@@ -228,38 +217,20 @@ static int numachip2_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 	return 1;
 }
 
-/* APIC IPIs are queued */
-static void numachip_apic_wait_icr_idle(void)
-{
-}
-
-/* APIC NMI IPIs are queued */
-static u32 numachip_safe_apic_wait_icr_idle(void)
-{
-	return 0;
-}
-
 static const struct apic apic_numachip1 __refconst = {
 	.name				= "NumaConnect system",
 	.probe				= numachip1_probe,
 	.acpi_madt_oem_check		= numachip1_acpi_madt_oem_check,
-	.apic_id_valid			= numachip_apic_id_valid,
-	.apic_id_registered		= numachip_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,
 
 	.disable_esr			= 0,
 
-	.check_apicid_used		= NULL,
-	.init_apic_ldr			= flat_init_apic_ldr,
-	.ioapic_phys_id_map		= NULL,
-	.setup_apic_routing		= NULL,
 	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
-	.apicid_to_cpu_present		= NULL,
-	.check_phys_apicid_present	= default_check_phys_apicid_present,
 	.phys_pkg_id			= numachip_phys_pkg_id,
 
+	.max_apic_id			= UINT_MAX,
 	.get_apic_id			= numachip1_get_apic_id,
 	.set_apic_id			= numachip1_set_apic_id,
 
@@ -273,15 +244,12 @@ static const struct apic apic_numachip1 __refconst = {
 	.send_IPI_self			= numachip_send_IPI_self,
 
 	.wakeup_secondary_cpu		= numachip_wakeup_secondary,
-	.inquire_remote_apic		= NULL, /* REMRD not supported */
 
 	.read				= native_apic_mem_read,
 	.write				= native_apic_mem_write,
-	.eoi_write			= native_apic_mem_write,
+	.eoi				= native_apic_mem_eoi,
 	.icr_read			= native_apic_icr_read,
 	.icr_write			= native_apic_icr_write,
-	.wait_icr_idle			= numachip_apic_wait_icr_idle,
-	.safe_wait_icr_idle		= numachip_safe_apic_wait_icr_idle,
 };
 
 apic_driver(apic_numachip1);
@@ -290,23 +258,16 @@ static const struct apic apic_numachip2 __refconst = {
 	.name				= "NumaConnect2 system",
 	.probe				= numachip2_probe,
 	.acpi_madt_oem_check		= numachip2_acpi_madt_oem_check,
-	.apic_id_valid			= numachip_apic_id_valid,
-	.apic_id_registered		= numachip_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,
 
 	.disable_esr			= 0,
 
-	.check_apicid_used		= NULL,
-	.init_apic_ldr			= flat_init_apic_ldr,
-	.ioapic_phys_id_map		= NULL,
-	.setup_apic_routing		= NULL,
 	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
-	.apicid_to_cpu_present		= NULL,
-	.check_phys_apicid_present	= default_check_phys_apicid_present,
 	.phys_pkg_id			= numachip_phys_pkg_id,
 
+	.max_apic_id			= UINT_MAX,
 	.get_apic_id			= numachip2_get_apic_id,
 	.set_apic_id			= numachip2_set_apic_id,
 
@@ -320,15 +281,12 @@ static const struct apic apic_numachip2 __refconst = {
 	.send_IPI_self			= numachip_send_IPI_self,
 
 	.wakeup_secondary_cpu		= numachip_wakeup_secondary,
-	.inquire_remote_apic		= NULL, /* REMRD not supported */
 
 	.read				= native_apic_mem_read,
 	.write				= native_apic_mem_write,
-	.eoi_write			= native_apic_mem_write,
+	.eoi				= native_apic_mem_eoi,
 	.icr_read			= native_apic_icr_read,
 	.icr_write			= native_apic_icr_write,
-	.wait_icr_idle			= numachip_apic_wait_icr_idle,
-	.safe_wait_icr_idle		= numachip_safe_apic_wait_icr_idle,
 };
 
 apic_driver(apic_numachip2);
diff --git a/arch/x86/kernel/apic/bigsmp_32.c b/arch/x86/kernel/apic/bigsmp_32.c
index 77555f66c14d..0e5535add4b5 100644
--- a/arch/x86/kernel/apic/bigsmp_32.c
+++ b/arch/x86/kernel/apic/bigsmp_32.c
@@ -18,56 +18,17 @@ static unsigned bigsmp_get_apic_id(unsigned long x)
 	return (x >> 24) & 0xFF;
 }
 
-static int bigsmp_apic_id_registered(void)
-{
-	return 1;
-}
-
 static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
 {
 	return false;
 }
 
-static int bigsmp_early_logical_apicid(int cpu)
-{
-	/* on bigsmp, logical apicid is the same as physical */
-	return early_per_cpu(x86_cpu_to_apicid, cpu);
-}
-
-/*
- * bigsmp enables physical destination mode
- * and doesn't use LDR and DFR
- */
-static void bigsmp_init_apic_ldr(void)
-{
-}
-
-static void bigsmp_setup_apic_routing(void)
-{
-	printk(KERN_INFO
-		"Enabling APIC mode:  Physflat.  Using %d I/O APICs\n",
-		nr_ioapics);
-}
-
-static int bigsmp_cpu_present_to_apicid(int mps_cpu)
-{
-	if (mps_cpu < nr_cpu_ids)
-		return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
-
-	return BAD_APICID;
-}
-
 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
 {
 	/* For clustered we don't have a good way to do this yet - hack */
 	physids_promote(0xFFL, retmap);
 }
 
-static int bigsmp_check_phys_apicid_present(int phys_apicid)
-{
-	return 1;
-}
-
 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
 {
 	return cpuid_apic >> index_msb;
@@ -111,21 +72,13 @@ static const struct dmi_system_id bigsmp_dmi_table[] = {
 
 static int probe_bigsmp(void)
 {
-	if (def_to_bigsmp)
-		dmi_bigsmp = 1;
-	else
-		dmi_check_system(bigsmp_dmi_table);
-
-	return dmi_bigsmp;
+	return dmi_check_system(bigsmp_dmi_table);
 }
 
 static struct apic apic_bigsmp __ro_after_init = {
 
 	.name				= "bigsmp",
 	.probe				= probe_bigsmp,
-	.acpi_madt_oem_check		= NULL,
-	.apic_id_valid			= default_apic_id_valid,
-	.apic_id_registered		= bigsmp_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,
@@ -133,14 +86,11 @@ static struct apic apic_bigsmp __ro_after_init = {
 	.disable_esr			= 1,
 
 	.check_apicid_used		= bigsmp_check_apicid_used,
-	.init_apic_ldr			= bigsmp_init_apic_ldr,
 	.ioapic_phys_id_map		= bigsmp_ioapic_phys_id_map,
-	.setup_apic_routing		= bigsmp_setup_apic_routing,
-	.cpu_present_to_apicid		= bigsmp_cpu_present_to_apicid,
-	.apicid_to_cpu_present		= physid_set_mask_of_physid,
-	.check_phys_apicid_present	= bigsmp_check_phys_apicid_present,
+	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
 	.phys_pkg_id			= bigsmp_phys_pkg_id,
 
+	.max_apic_id			= 0xFE,
 	.get_apic_id			= bigsmp_get_apic_id,
 	.set_apic_id			= NULL,
 
@@ -153,37 +103,24 @@ static struct apic apic_bigsmp __ro_after_init = {
 	.send_IPI_all			= bigsmp_send_IPI_all,
 	.send_IPI_self			= default_send_IPI_self,
 
-	.inquire_remote_apic		= default_inquire_remote_apic,
-
 	.read				= native_apic_mem_read,
 	.write				= native_apic_mem_write,
-	.eoi_write			= native_apic_mem_write,
+	.eoi				= native_apic_mem_eoi,
 	.icr_read			= native_apic_icr_read,
 	.icr_write			= native_apic_icr_write,
-	.wait_icr_idle			= native_apic_wait_icr_idle,
-	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
-
-	.x86_32_early_logical_apicid	= bigsmp_early_logical_apicid,
+	.wait_icr_idle			= apic_mem_wait_icr_idle,
+	.safe_wait_icr_idle		= apic_mem_wait_icr_idle_timeout,
 };
 
-void __init generic_bigsmp_probe(void)
+bool __init apic_bigsmp_possible(bool cmdline_override)
 {
-	unsigned int cpu;
-
-	if (!probe_bigsmp())
-		return;
-
-	apic = &apic_bigsmp;
-
-	for_each_possible_cpu(cpu) {
-		if (early_per_cpu(x86_cpu_to_logical_apicid,
-				  cpu) == BAD_APICID)
-			continue;
-		early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
-			bigsmp_early_logical_apicid(cpu);
-	}
+	return apic == &apic_bigsmp || !cmdline_override;
+}
 
-	pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
+void __init apic_bigsmp_force(void)
+{
+	if (apic != &apic_bigsmp)
+		apic_install_driver(&apic_bigsmp);
 }
 
 apic_driver(apic_bigsmp);
diff --git a/arch/x86/kernel/apic/hw_nmi.c b/arch/x86/kernel/apic/hw_nmi.c
index d6e01f924299..45af535c44a0 100644
--- a/arch/x86/kernel/apic/hw_nmi.c
+++ b/arch/x86/kernel/apic/hw_nmi.c
@@ -21,6 +21,8 @@
 #include <linux/init.h>
 #include <linux/delay.h>
 
+#include "local.h"
+
 #ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF
 u64 hw_nmi_get_sample_period(int watchdog_thresh)
 {
@@ -31,7 +33,7 @@ u64 hw_nmi_get_sample_period(int watchdog_thresh)
 #ifdef arch_trigger_cpumask_backtrace
 static void nmi_raise_cpu_backtrace(cpumask_t *mask)
 {
-	apic->send_IPI_mask(mask, NMI_VECTOR);
+	__apic_send_IPI_mask(mask, NMI_VECTOR);
 }
 
 void arch_trigger_cpumask_backtrace(const cpumask_t *mask, int exclude_cpu)
diff --git a/arch/x86/kernel/apic/init.c b/arch/x86/kernel/apic/init.c
new file mode 100644
index 000000000000..821e2e536f19
--- /dev/null
+++ b/arch/x86/kernel/apic/init.c
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define pr_fmt(fmt) "APIC: " fmt
+
+#include <asm/apic.h>
+
+#include "local.h"
+
+/*
+ * Use DEFINE_STATIC_CALL_NULL() to avoid having to provide stub functions
+ * for each callback. The callbacks are setup during boot and all except
+ * wait_icr_idle() must be initialized before usage. The IPI wrappers
+ * use static_call() and not static_call_cond() to catch any fails.
+ */
+#define DEFINE_APIC_CALL(__cb)						\
+	DEFINE_STATIC_CALL_NULL(apic_call_##__cb, *apic->__cb)
+
+DEFINE_APIC_CALL(eoi);
+DEFINE_APIC_CALL(native_eoi);
+DEFINE_APIC_CALL(icr_read);
+DEFINE_APIC_CALL(icr_write);
+DEFINE_APIC_CALL(read);
+DEFINE_APIC_CALL(send_IPI);
+DEFINE_APIC_CALL(send_IPI_mask);
+DEFINE_APIC_CALL(send_IPI_mask_allbutself);
+DEFINE_APIC_CALL(send_IPI_allbutself);
+DEFINE_APIC_CALL(send_IPI_all);
+DEFINE_APIC_CALL(send_IPI_self);
+DEFINE_APIC_CALL(wait_icr_idle);
+DEFINE_APIC_CALL(wakeup_secondary_cpu);
+DEFINE_APIC_CALL(wakeup_secondary_cpu_64);
+DEFINE_APIC_CALL(write);
+
+EXPORT_STATIC_CALL_TRAMP_GPL(apic_call_send_IPI_mask);
+EXPORT_STATIC_CALL_TRAMP_GPL(apic_call_send_IPI_self);
+
+/* The container for function call overrides */
+struct apic_override __x86_apic_override __initdata;
+
+#define apply_override(__cb)					\
+	if (__x86_apic_override.__cb)				\
+		apic->__cb = __x86_apic_override.__cb
+
+static __init void restore_override_callbacks(void)
+{
+	apply_override(eoi);
+	apply_override(native_eoi);
+	apply_override(write);
+	apply_override(read);
+	apply_override(send_IPI);
+	apply_override(send_IPI_mask);
+	apply_override(send_IPI_mask_allbutself);
+	apply_override(send_IPI_allbutself);
+	apply_override(send_IPI_all);
+	apply_override(send_IPI_self);
+	apply_override(icr_read);
+	apply_override(icr_write);
+	apply_override(wakeup_secondary_cpu);
+	apply_override(wakeup_secondary_cpu_64);
+}
+
+#define update_call(__cb)					\
+	static_call_update(apic_call_##__cb, *apic->__cb)
+
+static __init void update_static_calls(void)
+{
+	update_call(eoi);
+	update_call(native_eoi);
+	update_call(write);
+	update_call(read);
+	update_call(send_IPI);
+	update_call(send_IPI_mask);
+	update_call(send_IPI_mask_allbutself);
+	update_call(send_IPI_allbutself);
+	update_call(send_IPI_all);
+	update_call(send_IPI_self);
+	update_call(icr_read);
+	update_call(icr_write);
+	update_call(wait_icr_idle);
+	update_call(wakeup_secondary_cpu);
+	update_call(wakeup_secondary_cpu_64);
+}
+
+void __init apic_setup_apic_calls(void)
+{
+	/* Ensure that the default APIC has native_eoi populated */
+	apic->native_eoi = apic->eoi;
+	update_static_calls();
+	pr_info("Static calls initialized\n");
+}
+
+void __init apic_install_driver(struct apic *driver)
+{
+	if (apic == driver)
+		return;
+
+	apic = driver;
+
+	if (IS_ENABLED(CONFIG_X86_X2APIC) && apic->x2apic_set_max_apicid)
+		apic->max_apic_id = x2apic_max_apicid;
+
+	/* Copy the original eoi() callback as KVM/HyperV might overwrite it */
+	if (!apic->native_eoi)
+		apic->native_eoi = apic->eoi;
+
+	/* Apply any already installed callback overrides */
+	restore_override_callbacks();
+	update_static_calls();
+
+	pr_info("Switched APIC routing to: %s\n", driver->name);
+}
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 4241dc243aa8..00da6cf6b07d 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -178,7 +178,7 @@ int mp_bus_id_to_type[MAX_MP_BUSSES];
 
 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
 
-int skip_ioapic_setup;
+bool ioapic_is_disabled __ro_after_init;
 
 /**
  * disable_ioapic_support() - disables ioapic support at runtime
@@ -189,7 +189,7 @@ void disable_ioapic_support(void)
 	noioapicquirk = 1;
 	noioapicreroute = -1;
 #endif
-	skip_ioapic_setup = 1;
+	ioapic_is_disabled = true;
 }
 
 static int __init parse_noapic(char *str)
@@ -831,7 +831,7 @@ static int __acpi_get_override_irq(u32 gsi, bool *trigger, bool *polarity)
 {
 	int ioapic, pin, idx;
 
-	if (skip_ioapic_setup)
+	if (ioapic_is_disabled)
 		return -1;
 
 	ioapic = mp_find_ioapic(gsi);
@@ -1366,7 +1366,7 @@ void __init enable_IO_APIC(void)
 	int i8259_apic, i8259_pin;
 	int apic, pin;
 
-	if (skip_ioapic_setup)
+	if (ioapic_is_disabled)
 		nr_ioapics = 0;
 
 	if (!nr_legacy_irqs() || !nr_ioapics)
@@ -1511,13 +1511,9 @@ void __init setup_ioapic_ids_from_mpc_nocheck(void)
 			physid_set(i, phys_id_present_map);
 			ioapics[ioapic_idx].mp_config.apicid = i;
 		} else {
-			physid_mask_t tmp;
-			apic->apicid_to_cpu_present(mpc_ioapic_id(ioapic_idx),
-						    &tmp);
-			apic_printk(APIC_VERBOSE, "Setting %d in the "
-					"phys_id_present_map\n",
-					mpc_ioapic_id(ioapic_idx));
-			physids_or(phys_id_present_map, phys_id_present_map, tmp);
+			apic_printk(APIC_VERBOSE, "Setting %d in the phys_id_present_map\n",
+				    mpc_ioapic_id(ioapic_idx));
+			physid_set(mpc_ioapic_id(ioapic_idx), phys_id_present_map);
 		}
 
 		/*
@@ -1827,7 +1823,7 @@ static void ioapic_ack_level(struct irq_data *irq_data)
 	 * We must acknowledge the irq before we move it or the acknowledge will
 	 * not propagate properly.
 	 */
-	ack_APIC_irq();
+	apic_eoi();
 
 	/*
 	 * Tail end of clearing remote IRR bit (either by delivering the EOI
@@ -2050,7 +2046,7 @@ static void unmask_lapic_irq(struct irq_data *data)
 
 static void ack_lapic_irq(struct irq_data *data)
 {
-	ack_APIC_irq();
+	apic_eoi();
 }
 
 static struct irq_chip lapic_chip __read_mostly = {
@@ -2095,7 +2091,7 @@ static inline void __init unlock_ExtINT_logic(void)
 	entry0 = ioapic_read_entry(apic, pin);
 	clear_IO_APIC_pin(apic, pin);
 
-	apic_id = hard_smp_processor_id();
+	apic_id = read_apic_id();
 	memset(&entry1, 0, sizeof(entry1));
 
 	entry1.dest_mode_logical	= true;
@@ -2399,7 +2395,7 @@ void __init setup_IO_APIC(void)
 {
 	int ioapic;
 
-	if (skip_ioapic_setup || !nr_ioapics)
+	if (ioapic_is_disabled || !nr_ioapics)
 		return;
 
 	io_apic_irqs = nr_legacy_irqs() ? ~PIC_IRQS : ~0UL;
@@ -2546,7 +2542,7 @@ static int io_apic_get_unique_id(int ioapic, int apic_id)
 		apic_id = i;
 	}
 
-	apic->apicid_to_cpu_present(apic_id, &tmp);
+	physid_set_mask_of_physid(apic_id, &tmp);
 	physids_or(apic_id_map, apic_id_map, tmp);
 
 	if (reg_00.bits.ID != apic_id) {
@@ -2715,7 +2711,7 @@ void __init io_apic_init_mappings(void)
 				       "address found in MPTABLE, "
 				       "disabling IO/APIC support!\n");
 				smp_found_config = 0;
-				skip_ioapic_setup = 1;
+				ioapic_is_disabled = true;
 				goto fake_ioapic_page;
 			}
 #endif
diff --git a/arch/x86/kernel/apic/ipi.c b/arch/x86/kernel/apic/ipi.c
index 9bfd6e397384..a44ba7209ef3 100644
--- a/arch/x86/kernel/apic/ipi.c
+++ b/arch/x86/kernel/apic/ipi.c
@@ -1,7 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0
 
 #include <linux/cpumask.h>
+#include <linux/delay.h>
 #include <linux/smp.h>
+
 #include <asm/io_apic.h>
 
 #include "local.h"
@@ -52,9 +54,9 @@ void apic_send_IPI_allbutself(unsigned int vector)
 		return;
 
 	if (static_branch_likely(&apic_use_ipi_shorthand))
-		apic->send_IPI_allbutself(vector);
+		__apic_send_IPI_allbutself(vector);
 	else
-		apic->send_IPI_mask_allbutself(cpu_online_mask, vector);
+		__apic_send_IPI_mask_allbutself(cpu_online_mask, vector);
 }
 
 /*
@@ -68,12 +70,12 @@ void native_smp_send_reschedule(int cpu)
 		WARN(1, "sched: Unexpected reschedule of offline CPU#%d!\n", cpu);
 		return;
 	}
-	apic->send_IPI(cpu, RESCHEDULE_VECTOR);
+	__apic_send_IPI(cpu, RESCHEDULE_VECTOR);
 }
 
 void native_send_call_func_single_ipi(int cpu)
 {
-	apic->send_IPI(cpu, CALL_FUNCTION_SINGLE_VECTOR);
+	__apic_send_IPI(cpu, CALL_FUNCTION_SINGLE_VECTOR);
 }
 
 void native_send_call_func_ipi(const struct cpumask *mask)
@@ -85,14 +87,14 @@ void native_send_call_func_ipi(const struct cpumask *mask)
 			goto sendmask;
 
 		if (cpumask_test_cpu(cpu, mask))
-			apic->send_IPI_all(CALL_FUNCTION_VECTOR);
+			__apic_send_IPI_all(CALL_FUNCTION_VECTOR);
 		else if (num_online_cpus() > 1)
-			apic->send_IPI_allbutself(CALL_FUNCTION_VECTOR);
+			__apic_send_IPI_allbutself(CALL_FUNCTION_VECTOR);
 		return;
 	}
 
 sendmask:
-	apic->send_IPI_mask(mask, CALL_FUNCTION_VECTOR);
+	__apic_send_IPI_mask(mask, CALL_FUNCTION_VECTOR);
 }
 
 #endif /* CONFIG_SMP */
@@ -102,74 +104,77 @@ static inline int __prepare_ICR2(unsigned int mask)
 	return SET_XAPIC_DEST_FIELD(mask);
 }
 
-static inline void __xapic_wait_icr_idle(void)
+u32 apic_mem_wait_icr_idle_timeout(void)
+{
+	int cnt;
+
+	for (cnt = 0; cnt < 1000; cnt++) {
+		if (!(apic_read(APIC_ICR) & APIC_ICR_BUSY))
+			return 0;
+		inc_irq_stat(icr_read_retry_count);
+		udelay(100);
+	}
+	return APIC_ICR_BUSY;
+}
+
+void apic_mem_wait_icr_idle(void)
 {
 	while (native_apic_mem_read(APIC_ICR) & APIC_ICR_BUSY)
 		cpu_relax();
 }
 
-void __default_send_IPI_shortcut(unsigned int shortcut, int vector)
+/*
+ * This is safe against interruption because it only writes the lower 32
+ * bits of the APIC_ICR register. The destination field is ignored for
+ * short hand IPIs.
+ *
+ *  wait_icr_idle()
+ *  write(ICR2, dest)
+ *  NMI
+ *	wait_icr_idle()
+ *	write(ICR)
+ *	wait_icr_idle()
+ *  write(ICR)
+ *
+ * This function does not need to disable interrupts as there is no ICR2
+ * interaction. The memory write is direct except when the machine is
+ * affected by the 11AP Pentium erratum, which turns the plain write into
+ * an XCHG operation.
+ */
+static void __default_send_IPI_shortcut(unsigned int shortcut, int vector)
 {
 	/*
-	 * Subtle. In the case of the 'never do double writes' workaround
-	 * we have to lock out interrupts to be safe.  As we don't care
-	 * of the value read we use an atomic rmw access to avoid costly
-	 * cli/sti.  Otherwise we use an even cheaper single atomic write
-	 * to the APIC.
-	 */
-	unsigned int cfg;
-
-	/*
-	 * Wait for idle.
+	 * Wait for the previous ICR command to complete.  Use
+	 * safe_apic_wait_icr_idle() for the NMI vector as there have been
+	 * issues where otherwise the system hangs when the panic CPU tries
+	 * to stop the others before launching the kdump kernel.
 	 */
 	if (unlikely(vector == NMI_VECTOR))
-		safe_apic_wait_icr_idle();
+		apic_mem_wait_icr_idle_timeout();
 	else
-		__xapic_wait_icr_idle();
+		apic_mem_wait_icr_idle();
 
-	/*
-	 * No need to touch the target chip field. Also the destination
-	 * mode is ignored when a shorthand is used.
-	 */
-	cfg = __prepare_ICR(shortcut, vector, 0);
-
-	/*
-	 * Send the IPI. The write to APIC_ICR fires this off.
-	 */
-	native_apic_mem_write(APIC_ICR, cfg);
+	/* Destination field (ICR2) and the destination mode are ignored */
+	native_apic_mem_write(APIC_ICR, __prepare_ICR(shortcut, vector, 0));
 }
 
 /*
  * This is used to send an IPI with no shorthand notation (the destination is
  * specified in bits 56 to 63 of the ICR).
  */
-void __default_send_IPI_dest_field(unsigned int mask, int vector, unsigned int dest)
+void __default_send_IPI_dest_field(unsigned int dest_mask, int vector,
+				   unsigned int dest_mode)
 {
-	unsigned long cfg;
-
-	/*
-	 * Wait for idle.
-	 */
+	/* See comment in __default_send_IPI_shortcut() */
 	if (unlikely(vector == NMI_VECTOR))
-		safe_apic_wait_icr_idle();
+		apic_mem_wait_icr_idle_timeout();
 	else
-		__xapic_wait_icr_idle();
+		apic_mem_wait_icr_idle();
 
-	/*
-	 * prepare target chip field
-	 */
-	cfg = __prepare_ICR2(mask);
-	native_apic_mem_write(APIC_ICR2, cfg);
-
-	/*
-	 * program the ICR
-	 */
-	cfg = __prepare_ICR(0, vector, dest);
-
-	/*
-	 * Send the IPI. The write to APIC_ICR fires this off.
-	 */
-	native_apic_mem_write(APIC_ICR, cfg);
+	/* Set the IPI destination field in the ICR */
+	native_apic_mem_write(APIC_ICR2, __prepare_ICR2(dest_mask));
+	/* Send it with the proper destination mode */
+	native_apic_mem_write(APIC_ICR, __prepare_ICR(0, vector, dest_mode));
 }
 
 void default_send_IPI_single_phys(int cpu, int vector)
@@ -184,18 +189,13 @@ void default_send_IPI_single_phys(int cpu, int vector)
 
 void default_send_IPI_mask_sequence_phys(const struct cpumask *mask, int vector)
 {
-	unsigned long query_cpu;
 	unsigned long flags;
+	unsigned long cpu;
 
-	/*
-	 * Hack. The clustered APIC addressing mode doesn't allow us to send
-	 * to an arbitrary mask, so I do a unicast to each CPU instead.
-	 * - mbligh
-	 */
 	local_irq_save(flags);
-	for_each_cpu(query_cpu, mask) {
+	for_each_cpu(cpu, mask) {
 		__default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
-				query_cpu), vector, APIC_DEST_PHYSICAL);
+				cpu), vector, APIC_DEST_PHYSICAL);
 	}
 	local_irq_restore(flags);
 }
@@ -203,18 +203,15 @@ void default_send_IPI_mask_sequence_phys(const struct cpumask *mask, int vector)
 void default_send_IPI_mask_allbutself_phys(const struct cpumask *mask,
 						 int vector)
 {
-	unsigned int this_cpu = smp_processor_id();
-	unsigned int query_cpu;
+	unsigned int cpu, this_cpu = smp_processor_id();
 	unsigned long flags;
 
-	/* See Hack comment above */
-
 	local_irq_save(flags);
-	for_each_cpu(query_cpu, mask) {
-		if (query_cpu == this_cpu)
+	for_each_cpu(cpu, mask) {
+		if (cpu == this_cpu)
 			continue;
 		__default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
-				 query_cpu), vector, APIC_DEST_PHYSICAL);
+				 cpu), vector, APIC_DEST_PHYSICAL);
 	}
 	local_irq_restore(flags);
 }
@@ -224,7 +221,7 @@ void default_send_IPI_mask_allbutself_phys(const struct cpumask *mask,
  */
 void default_send_IPI_single(int cpu, int vector)
 {
-	apic->send_IPI_mask(cpumask_of(cpu), vector);
+	__apic_send_IPI_mask(cpumask_of(cpu), vector);
 }
 
 void default_send_IPI_allbutself(int vector)
@@ -243,50 +240,32 @@ void default_send_IPI_self(int vector)
 }
 
 #ifdef CONFIG_X86_32
-
-void default_send_IPI_mask_sequence_logical(const struct cpumask *mask,
-						 int vector)
+void default_send_IPI_mask_sequence_logical(const struct cpumask *mask, int vector)
 {
 	unsigned long flags;
-	unsigned int query_cpu;
-
-	/*
-	 * Hack. The clustered APIC addressing mode doesn't allow us to send
-	 * to an arbitrary mask, so I do a unicasts to each CPU instead. This
-	 * should be modified to do 1 message per cluster ID - mbligh
-	 */
+	unsigned int cpu;
 
 	local_irq_save(flags);
-	for_each_cpu(query_cpu, mask)
-		__default_send_IPI_dest_field(
-			early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
-			vector, APIC_DEST_LOGICAL);
+	for_each_cpu(cpu, mask)
+		__default_send_IPI_dest_field(1U << cpu, vector, APIC_DEST_LOGICAL);
 	local_irq_restore(flags);
 }
 
 void default_send_IPI_mask_allbutself_logical(const struct cpumask *mask,
 						 int vector)
 {
+	unsigned int cpu, this_cpu = smp_processor_id();
 	unsigned long flags;
-	unsigned int query_cpu;
-	unsigned int this_cpu = smp_processor_id();
-
-	/* See Hack comment above */
 
 	local_irq_save(flags);
-	for_each_cpu(query_cpu, mask) {
-		if (query_cpu == this_cpu)
+	for_each_cpu(cpu, mask) {
+		if (cpu == this_cpu)
 			continue;
-		__default_send_IPI_dest_field(
-			early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
-			vector, APIC_DEST_LOGICAL);
-		}
+		__default_send_IPI_dest_field(1U << cpu, vector, APIC_DEST_LOGICAL);
+	}
 	local_irq_restore(flags);
 }
 
-/*
- * This is only used on smaller machines.
- */
 void default_send_IPI_mask_logical(const struct cpumask *cpumask, int vector)
 {
 	unsigned long mask = cpumask_bits(cpumask)[0];
@@ -302,7 +281,6 @@ void default_send_IPI_mask_logical(const struct cpumask *cpumask, int vector)
 }
 
 #ifdef CONFIG_SMP
-/* must come after the send_IPI functions above for inlining */
 static int convert_apicid_to_cpu(int apic_id)
 {
 	int i;
@@ -321,7 +299,7 @@ int safe_smp_processor_id(void)
 	if (!boot_cpu_has(X86_FEATURE_APIC))
 		return 0;
 
-	apicid = hard_smp_processor_id();
+	apicid = read_apic_id();
 	if (apicid == BAD_APICID)
 		return 0;
 
diff --git a/arch/x86/kernel/apic/local.h b/arch/x86/kernel/apic/local.h
index a997d849509a..ec219c659c7d 100644
--- a/arch/x86/kernel/apic/local.h
+++ b/arch/x86/kernel/apic/local.h
@@ -13,18 +13,16 @@
 #include <asm/irq_vectors.h>
 #include <asm/apic.h>
 
-/* APIC flat 64 */
-void flat_init_apic_ldr(void);
-
 /* X2APIC */
-int x2apic_apic_id_valid(u32 apicid);
-int x2apic_apic_id_registered(void);
 void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest);
 unsigned int x2apic_get_apic_id(unsigned long id);
 u32 x2apic_set_apic_id(unsigned int id);
 int x2apic_phys_pkg_id(int initial_apicid, int index_msb);
+
+void x2apic_send_IPI_all(int vector);
+void x2apic_send_IPI_allbutself(int vector);
 void x2apic_send_IPI_self(int vector);
-void __x2apic_send_IPI_shorthand(int vector, u32 which);
+extern u32 x2apic_max_apicid;
 
 /* IPI */
 
@@ -46,7 +44,10 @@ static inline unsigned int __prepare_ICR(unsigned int shortcut, int vector,
 	return icr;
 }
 
-void __default_send_IPI_shortcut(unsigned int shortcut, int vector);
+void default_init_apic_ldr(void);
+
+void apic_mem_wait_icr_idle(void);
+u32 apic_mem_wait_icr_idle_timeout(void);
 
 /*
  * This is used to send an IPI with no shorthand notation (the destination is
@@ -62,8 +63,23 @@ void default_send_IPI_allbutself(int vector);
 void default_send_IPI_all(int vector);
 void default_send_IPI_self(int vector);
 
+bool default_apic_id_registered(void);
+
 #ifdef CONFIG_X86_32
 void default_send_IPI_mask_sequence_logical(const struct cpumask *mask, int vector);
 void default_send_IPI_mask_allbutself_logical(const struct cpumask *mask, int vector);
 void default_send_IPI_mask_logical(const struct cpumask *mask, int vector);
+void x86_32_probe_bigsmp_early(void);
+void x86_32_install_bigsmp(void);
+#else
+static inline void x86_32_probe_bigsmp_early(void) { }
+static inline void x86_32_install_bigsmp(void) { }
+#endif
+
+#ifdef CONFIG_X86_BIGSMP
+bool apic_bigsmp_possible(bool cmdline_selected);
+void apic_bigsmp_force(void);
+#else
+static inline bool apic_bigsmp_possible(bool cmdline_selected) { return false; };
+static inline void apic_bigsmp_force(void) { }
 #endif
diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index 35d5b8fb18ef..6b6b711678fe 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -269,7 +269,7 @@ static const struct msi_parent_ops x86_vector_msi_parent_ops = {
 
 struct irq_domain * __init native_create_pci_msi_domain(void)
 {
-	if (disable_apic)
+	if (apic_is_disabled)
 		return NULL;
 
 	x86_vector_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT;
diff --git a/arch/x86/kernel/apic/probe_32.c b/arch/x86/kernel/apic/probe_32.c
index a61f642b1b90..9a06df6cdd68 100644
--- a/arch/x86/kernel/apic/probe_32.c
+++ b/arch/x86/kernel/apic/probe_32.c
@@ -10,46 +10,14 @@
 #include <linux/errno.h>
 #include <linux/smp.h>
 
+#include <xen/xen.h>
+
 #include <asm/io_apic.h>
 #include <asm/apic.h>
 #include <asm/acpi.h>
 
 #include "local.h"
 
-static int default_x86_32_early_logical_apicid(int cpu)
-{
-	return 1 << cpu;
-}
-
-static void setup_apic_flat_routing(void)
-{
-#ifdef CONFIG_X86_IO_APIC
-	printk(KERN_INFO
-		"Enabling APIC mode:  Flat.  Using %d I/O APICs\n",
-		nr_ioapics);
-#endif
-}
-
-static int default_apic_id_registered(void)
-{
-	return physid_isset(read_apic_id(), phys_cpu_present_map);
-}
-
-/*
- * Set up the logical destination ID.  Intel recommends to set DFR, LDR and
- * TPR before enabling an APIC.  See e.g. "AP-388 82489DX User's Manual"
- * (Intel document number 292116).
- */
-static void default_init_apic_ldr(void)
-{
-	unsigned long val;
-
-	apic_write(APIC_DFR, APIC_DFR_VALUE);
-	val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
-	val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
-	apic_write(APIC_LDR, val);
-}
-
 static int default_phys_pkg_id(int cpuid_apic, int index_msb)
 {
 	return cpuid_apic >> index_msb;
@@ -65,8 +33,6 @@ static struct apic apic_default __ro_after_init = {
 
 	.name				= "default",
 	.probe				= probe_default,
-	.acpi_madt_oem_check		= NULL,
-	.apic_id_valid			= default_apic_id_valid,
 	.apic_id_registered		= default_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
@@ -77,14 +43,11 @@ static struct apic apic_default __ro_after_init = {
 	.check_apicid_used		= default_check_apicid_used,
 	.init_apic_ldr			= default_init_apic_ldr,
 	.ioapic_phys_id_map		= default_ioapic_phys_id_map,
-	.setup_apic_routing		= setup_apic_flat_routing,
 	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
-	.apicid_to_cpu_present		= physid_set_mask_of_physid,
-	.check_phys_apicid_present	= default_check_phys_apicid_present,
 	.phys_pkg_id			= default_phys_pkg_id,
 
+	.max_apic_id			= 0xFE,
 	.get_apic_id			= default_get_apic_id,
-	.set_apic_id			= NULL,
 
 	.calc_dest_apicid		= apic_flat_calc_apicid,
 
@@ -95,17 +58,13 @@ static struct apic apic_default __ro_after_init = {
 	.send_IPI_all			= default_send_IPI_all,
 	.send_IPI_self			= default_send_IPI_self,
 
-	.inquire_remote_apic		= default_inquire_remote_apic,
-
 	.read				= native_apic_mem_read,
 	.write				= native_apic_mem_write,
-	.eoi_write			= native_apic_mem_write,
+	.eoi				= native_apic_mem_eoi,
 	.icr_read			= native_apic_icr_read,
 	.icr_write			= native_apic_icr_write,
-	.wait_icr_idle			= native_apic_wait_icr_idle,
-	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
-
-	.x86_32_early_logical_apicid	= default_x86_32_early_logical_apicid,
+	.wait_icr_idle			= apic_mem_wait_icr_idle,
+	.safe_wait_icr_idle		= apic_mem_wait_icr_idle_timeout,
 };
 
 apic_driver(apic_default);
@@ -123,7 +82,7 @@ static int __init parse_apic(char *arg)
 
 	for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 		if (!strcmp((*drv)->name, arg)) {
-			apic = *drv;
+			apic_install_driver(*drv);
 			cmdline_apic = 1;
 			return 0;
 		}
@@ -134,49 +93,43 @@ static int __init parse_apic(char *arg)
 }
 early_param("apic", parse_apic);
 
-void __init default_setup_apic_routing(void)
+void __init x86_32_probe_bigsmp_early(void)
 {
-	int version = boot_cpu_apic_version;
+	if (nr_cpu_ids <= 8 || xen_pv_domain())
+		return;
 
-	if (num_possible_cpus() > 8) {
+	if (IS_ENABLED(CONFIG_X86_BIGSMP)) {
 		switch (boot_cpu_data.x86_vendor) {
 		case X86_VENDOR_INTEL:
-			if (!APIC_XAPIC(version)) {
-				def_to_bigsmp = 0;
+			if (!APIC_XAPIC(boot_cpu_apic_version))
 				break;
-			}
 			/* P4 and above */
 			fallthrough;
 		case X86_VENDOR_HYGON:
 		case X86_VENDOR_AMD:
-			def_to_bigsmp = 1;
+			if (apic_bigsmp_possible(cmdline_apic))
+				return;
+			break;
 		}
 	}
+	pr_info("Limiting to 8 possible CPUs\n");
+	set_nr_cpu_ids(8);
+}
 
-#ifdef CONFIG_X86_BIGSMP
-	/*
-	 * This is used to switch to bigsmp mode when
-	 * - There is no apic= option specified by the user
-	 * - generic_apic_probe() has chosen apic_default as the sub_arch
-	 * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
-	 */
-
-	if (!cmdline_apic && apic == &apic_default)
-		generic_bigsmp_probe();
-#endif
-
-	if (apic->setup_apic_routing)
-		apic->setup_apic_routing();
+void __init x86_32_install_bigsmp(void)
+{
+	if (nr_cpu_ids > 8 && !xen_pv_domain())
+		apic_bigsmp_force();
 }
 
-void __init generic_apic_probe(void)
+void __init x86_32_probe_apic(void)
 {
 	if (!cmdline_apic) {
 		struct apic **drv;
 
 		for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 			if ((*drv)->probe()) {
-				apic = *drv;
+				apic_install_driver(*drv);
 				break;
 			}
 		}
@@ -184,26 +137,4 @@ void __init generic_apic_probe(void)
 		if (drv == __apicdrivers_end)
 			panic("Didn't find an APIC driver");
 	}
-	printk(KERN_INFO "Using APIC driver %s\n", apic->name);
-}
-
-/* This function can switch the APIC even after the initial ->probe() */
-int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
-{
-	struct apic **drv;
-
-	for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
-		if (!(*drv)->acpi_madt_oem_check)
-			continue;
-		if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id))
-			continue;
-
-		if (!cmdline_apic) {
-			apic = *drv;
-			printk(KERN_INFO "Switched to APIC driver `%s'.\n",
-			       apic->name);
-		}
-		return 1;
-	}
-	return 0;
 }
diff --git a/arch/x86/kernel/apic/probe_64.c b/arch/x86/kernel/apic/probe_64.c
index c46720f185c0..ecdf0c4121e1 100644
--- a/arch/x86/kernel/apic/probe_64.c
+++ b/arch/x86/kernel/apic/probe_64.c
@@ -13,10 +13,8 @@
 
 #include "local.h"
 
-/*
- * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
- */
-void __init default_setup_apic_routing(void)
+/* Select the appropriate APIC driver */
+void __init x86_64_probe_apic(void)
 {
 	struct apic **drv;
 
@@ -24,11 +22,7 @@ void __init default_setup_apic_routing(void)
 
 	for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 		if ((*drv)->probe && (*drv)->probe()) {
-			if (apic != *drv) {
-				apic = *drv;
-				pr_info("Switched APIC routing to %s.\n",
-					apic->name);
-			}
+			apic_install_driver(*drv);
 			break;
 		}
 	}
@@ -40,11 +34,7 @@ int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 
 	for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 		if ((*drv)->acpi_madt_oem_check(oem_id, oem_table_id)) {
-			if (apic != *drv) {
-				apic = *drv;
-				pr_info("Setting APIC routing to %s.\n",
-					apic->name);
-			}
+			apic_install_driver(*drv);
 			return 1;
 		}
 	}
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index c1efebd27e6c..319448d87b99 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -44,7 +44,18 @@ static cpumask_var_t vector_searchmask;
 static struct irq_chip lapic_controller;
 static struct irq_matrix *vector_matrix;
 #ifdef CONFIG_SMP
-static DEFINE_PER_CPU(struct hlist_head, cleanup_list);
+
+static void vector_cleanup_callback(struct timer_list *tmr);
+
+struct vector_cleanup {
+	struct hlist_head	head;
+	struct timer_list	timer;
+};
+
+static DEFINE_PER_CPU(struct vector_cleanup, vector_cleanup) = {
+	.head	= HLIST_HEAD_INIT,
+	.timer	= __TIMER_INITIALIZER(vector_cleanup_callback, TIMER_PINNED),
+};
 #endif
 
 void lock_vector_lock(void)
@@ -536,7 +547,7 @@ static int x86_vector_alloc_irqs(struct irq_domain *domain, unsigned int virq,
 	struct irq_data *irqd;
 	int i, err, node;
 
-	if (disable_apic)
+	if (apic_is_disabled)
 		return -ENXIO;
 
 	/*
@@ -680,7 +691,7 @@ static int x86_vector_select(struct irq_domain *d, struct irq_fwspec *fwspec,
 	 * if IRQ remapping is enabled. APIC IDs above 15 bits are
 	 * only permitted if IRQ remapping is enabled, so check that.
 	 */
-	if (apic->apic_id_valid(32768))
+	if (apic_id_valid(32768))
 		return 0;
 
 	return x86_fwspec_is_ioapic(fwspec) || x86_fwspec_is_hpet(fwspec);
@@ -841,10 +852,21 @@ void lapic_online(void)
 		this_cpu_write(vector_irq[vector], __setup_vector_irq(vector));
 }
 
+static void __vector_cleanup(struct vector_cleanup *cl, bool check_irr);
+
 void lapic_offline(void)
 {
+	struct vector_cleanup *cl = this_cpu_ptr(&vector_cleanup);
+
 	lock_vector_lock();
+
+	/* In case the vector cleanup timer has not expired */
+	__vector_cleanup(cl, false);
+
 	irq_matrix_offline(vector_matrix);
+	WARN_ON_ONCE(try_to_del_timer_sync(&cl->timer) < 0);
+	WARN_ON_ONCE(!hlist_empty(&cl->head));
+
 	unlock_vector_lock();
 }
 
@@ -876,7 +898,7 @@ static int apic_retrigger_irq(struct irq_data *irqd)
 	unsigned long flags;
 
 	raw_spin_lock_irqsave(&vector_lock, flags);
-	apic->send_IPI(apicd->cpu, apicd->vector);
+	__apic_send_IPI(apicd->cpu, apicd->vector);
 	raw_spin_unlock_irqrestore(&vector_lock, flags);
 
 	return 1;
@@ -885,7 +907,7 @@ static int apic_retrigger_irq(struct irq_data *irqd)
 void apic_ack_irq(struct irq_data *irqd)
 {
 	irq_move_irq(irqd);
-	ack_APIC_irq();
+	apic_eoi();
 }
 
 void apic_ack_edge(struct irq_data *irqd)
@@ -934,62 +956,98 @@ static void free_moved_vector(struct apic_chip_data *apicd)
 	apicd->move_in_progress = 0;
 }
 
-DEFINE_IDTENTRY_SYSVEC(sysvec_irq_move_cleanup)
+static void __vector_cleanup(struct vector_cleanup *cl, bool check_irr)
 {
-	struct hlist_head *clhead = this_cpu_ptr(&cleanup_list);
 	struct apic_chip_data *apicd;
 	struct hlist_node *tmp;
+	bool rearm = false;
 
-	ack_APIC_irq();
-	/* Prevent vectors vanishing under us */
-	raw_spin_lock(&vector_lock);
+	lockdep_assert_held(&vector_lock);
 
-	hlist_for_each_entry_safe(apicd, tmp, clhead, clist) {
+	hlist_for_each_entry_safe(apicd, tmp, &cl->head, clist) {
 		unsigned int irr, vector = apicd->prev_vector;
 
 		/*
 		 * Paranoia: Check if the vector that needs to be cleaned
-		 * up is registered at the APICs IRR. If so, then this is
-		 * not the best time to clean it up. Clean it up in the
-		 * next attempt by sending another IRQ_MOVE_CLEANUP_VECTOR
-		 * to this CPU. IRQ_MOVE_CLEANUP_VECTOR is the lowest
-		 * priority external vector, so on return from this
-		 * interrupt the device interrupt will happen first.
+		 * up is registered at the APICs IRR. That's clearly a
+		 * hardware issue if the vector arrived on the old target
+		 * _after_ interrupts were disabled above. Keep @apicd
+		 * on the list and schedule the timer again to give the CPU
+		 * a chance to handle the pending interrupt.
+		 *
+		 * Do not check IRR when called from lapic_offline(), because
+		 * fixup_irqs() was just called to scan IRR for set bits and
+		 * forward them to new destination CPUs via IPIs.
 		 */
-		irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
+		irr = check_irr ? apic_read(APIC_IRR + (vector / 32 * 0x10)) : 0;
 		if (irr & (1U << (vector % 32))) {
-			apic->send_IPI_self(IRQ_MOVE_CLEANUP_VECTOR);
+			pr_warn_once("Moved interrupt pending in old target APIC %u\n", apicd->irq);
+			rearm = true;
 			continue;
 		}
 		free_moved_vector(apicd);
 	}
 
-	raw_spin_unlock(&vector_lock);
+	/*
+	 * Must happen under vector_lock to make the timer_pending() check
+	 * in __vector_schedule_cleanup() race free against the rearm here.
+	 */
+	if (rearm)
+		mod_timer(&cl->timer, jiffies + 1);
+}
+
+static void vector_cleanup_callback(struct timer_list *tmr)
+{
+	struct vector_cleanup *cl = container_of(tmr, typeof(*cl), timer);
+
+	/* Prevent vectors vanishing under us */
+	raw_spin_lock_irq(&vector_lock);
+	__vector_cleanup(cl, true);
+	raw_spin_unlock_irq(&vector_lock);
 }
 
-static void __send_cleanup_vector(struct apic_chip_data *apicd)
+static void __vector_schedule_cleanup(struct apic_chip_data *apicd)
 {
-	unsigned int cpu;
+	unsigned int cpu = apicd->prev_cpu;
 
 	raw_spin_lock(&vector_lock);
 	apicd->move_in_progress = 0;
-	cpu = apicd->prev_cpu;
 	if (cpu_online(cpu)) {
-		hlist_add_head(&apicd->clist, per_cpu_ptr(&cleanup_list, cpu));
-		apic->send_IPI(cpu, IRQ_MOVE_CLEANUP_VECTOR);
+		struct vector_cleanup *cl = per_cpu_ptr(&vector_cleanup, cpu);
+
+		hlist_add_head(&apicd->clist, &cl->head);
+
+		/*
+		 * The lockless timer_pending() check is safe here. If it
+		 * returns true, then the callback will observe this new
+		 * apic data in the hlist as everything is serialized by
+		 * vector lock.
+		 *
+		 * If it returns false then the timer is either not armed
+		 * or the other CPU executes the callback, which again
+		 * would be blocked on vector lock. Rearming it in the
+		 * latter case makes it fire for nothing.
+		 *
+		 * This is also safe against the callback rearming the timer
+		 * because that's serialized via vector lock too.
+		 */
+		if (!timer_pending(&cl->timer)) {
+			cl->timer.expires = jiffies + 1;
+			add_timer_on(&cl->timer, cpu);
+		}
 	} else {
 		apicd->prev_vector = 0;
 	}
 	raw_spin_unlock(&vector_lock);
 }
 
-void send_cleanup_vector(struct irq_cfg *cfg)
+void vector_schedule_cleanup(struct irq_cfg *cfg)
 {
 	struct apic_chip_data *apicd;
 
 	apicd = container_of(cfg, struct apic_chip_data, hw_irq_cfg);
 	if (apicd->move_in_progress)
-		__send_cleanup_vector(apicd);
+		__vector_schedule_cleanup(apicd);
 }
 
 void irq_complete_move(struct irq_cfg *cfg)
@@ -1007,7 +1065,7 @@ void irq_complete_move(struct irq_cfg *cfg)
 	 * on the same CPU.
 	 */
 	if (apicd->cpu == smp_processor_id())
-		__send_cleanup_vector(apicd);
+		__vector_schedule_cleanup(apicd);
 }
 
 /*
@@ -1150,7 +1208,7 @@ static void __init print_local_APIC(void *dummy)
 	u64 icr;
 
 	pr_debug("printing local APIC contents on CPU#%d/%d:\n",
-		 smp_processor_id(), hard_smp_processor_id());
+		 smp_processor_id(), read_apic_id());
 	v = apic_read(APIC_ID);
 	pr_info("... APIC ID:      %08x (%01x)\n", v, read_apic_id());
 	v = apic_read(APIC_LVR);
diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x2apic_cluster.c
index b2b2b7f3e03f..affbff65e497 100644
--- a/arch/x86/kernel/apic/x2apic_cluster.c
+++ b/arch/x86/kernel/apic/x2apic_cluster.c
@@ -83,16 +83,6 @@ x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
 	__x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
 }
 
-static void x2apic_send_IPI_allbutself(int vector)
-{
-	__x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLBUT);
-}
-
-static void x2apic_send_IPI_all(int vector)
-{
-	__x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLINC);
-}
-
 static u32 x2apic_calc_apicid(unsigned int cpu)
 {
 	return x86_cpu_to_logical_apicid[cpu];
@@ -236,8 +226,6 @@ static struct apic apic_x2apic_cluster __ro_after_init = {
 	.name				= "cluster x2apic",
 	.probe				= x2apic_cluster_probe,
 	.acpi_madt_oem_check		= x2apic_acpi_madt_oem_check,
-	.apic_id_valid			= x2apic_apic_id_valid,
-	.apic_id_registered		= x2apic_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= true,
@@ -247,12 +235,11 @@ static struct apic apic_x2apic_cluster __ro_after_init = {
 	.check_apicid_used		= NULL,
 	.init_apic_ldr			= init_x2apic_ldr,
 	.ioapic_phys_id_map		= NULL,
-	.setup_apic_routing		= NULL,
 	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
-	.apicid_to_cpu_present		= NULL,
-	.check_phys_apicid_present	= default_check_phys_apicid_present,
 	.phys_pkg_id			= x2apic_phys_pkg_id,
 
+	.max_apic_id			= UINT_MAX,
+	.x2apic_set_max_apicid		= true,
 	.get_apic_id			= x2apic_get_apic_id,
 	.set_apic_id			= x2apic_set_apic_id,
 
@@ -265,15 +252,11 @@ static struct apic apic_x2apic_cluster __ro_after_init = {
 	.send_IPI_all			= x2apic_send_IPI_all,
 	.send_IPI_self			= x2apic_send_IPI_self,
 
-	.inquire_remote_apic		= NULL,
-
 	.read				= native_apic_msr_read,
 	.write				= native_apic_msr_write,
-	.eoi_write			= native_apic_msr_eoi_write,
+	.eoi				= native_apic_msr_eoi,
 	.icr_read			= native_x2apic_icr_read,
 	.icr_write			= native_x2apic_icr_write,
-	.wait_icr_idle			= native_x2apic_wait_icr_idle,
-	.safe_wait_icr_idle		= native_safe_x2apic_wait_icr_idle,
 };
 
 apic_driver(apic_x2apic_cluster);
diff --git a/arch/x86/kernel/apic/x2apic_phys.c b/arch/x86/kernel/apic/x2apic_phys.c
index 896bc41cb2ba..788cdb4ee394 100644
--- a/arch/x86/kernel/apic/x2apic_phys.c
+++ b/arch/x86/kernel/apic/x2apic_phys.c
@@ -8,11 +8,13 @@
 int x2apic_phys;
 
 static struct apic apic_x2apic_phys;
-static u32 x2apic_max_apicid __ro_after_init;
+u32 x2apic_max_apicid __ro_after_init = UINT_MAX;
 
 void __init x2apic_set_max_apicid(u32 apicid)
 {
 	x2apic_max_apicid = apicid;
+	if (apic->x2apic_set_max_apicid)
+		apic->max_apic_id = apicid;
 }
 
 static int __init set_x2apic_phys_mode(char *arg)
@@ -81,43 +83,28 @@ static void
 	__x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
 }
 
-static void x2apic_send_IPI_allbutself(int vector)
+static void __x2apic_send_IPI_shorthand(int vector, u32 which)
 {
-	__x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLBUT);
-}
+	unsigned long cfg = __prepare_ICR(which, vector, 0);
 
-static void x2apic_send_IPI_all(int vector)
-{
-	__x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLINC);
+	/* x2apic MSRs are special and need a special fence: */
+	weak_wrmsr_fence();
+	native_x2apic_icr_write(cfg, 0);
 }
 
-static void init_x2apic_ldr(void)
+void x2apic_send_IPI_allbutself(int vector)
 {
+	__x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLBUT);
 }
 
-static int x2apic_phys_probe(void)
-{
-	if (!x2apic_mode)
-		return 0;
-
-	if (x2apic_phys || x2apic_fadt_phys())
-		return 1;
-
-	return apic == &apic_x2apic_phys;
-}
-
-/* Common x2apic functions, also used by x2apic_cluster */
-int x2apic_apic_id_valid(u32 apicid)
+void x2apic_send_IPI_all(int vector)
 {
-	if (x2apic_max_apicid && apicid > x2apic_max_apicid)
-		return 0;
-
-	return 1;
+	__x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLINC);
 }
 
-int x2apic_apic_id_registered(void)
+void x2apic_send_IPI_self(int vector)
 {
-	return 1;
+	apic_write(APIC_SELF_IPI, vector);
 }
 
 void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest)
@@ -126,13 +113,15 @@ void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest)
 	native_x2apic_icr_write(cfg, apicid);
 }
 
-void __x2apic_send_IPI_shorthand(int vector, u32 which)
+static int x2apic_phys_probe(void)
 {
-	unsigned long cfg = __prepare_ICR(which, vector, 0);
+	if (!x2apic_mode)
+		return 0;
 
-	/* x2apic MSRs are special and need a special fence: */
-	weak_wrmsr_fence();
-	native_x2apic_icr_write(cfg, 0);
+	if (x2apic_phys || x2apic_fadt_phys())
+		return 1;
+
+	return apic == &apic_x2apic_phys;
 }
 
 unsigned int x2apic_get_apic_id(unsigned long id)
@@ -150,33 +139,22 @@ int x2apic_phys_pkg_id(int initial_apicid, int index_msb)
 	return initial_apicid >> index_msb;
 }
 
-void x2apic_send_IPI_self(int vector)
-{
-	apic_write(APIC_SELF_IPI, vector);
-}
-
 static struct apic apic_x2apic_phys __ro_after_init = {
 
 	.name				= "physical x2apic",
 	.probe				= x2apic_phys_probe,
 	.acpi_madt_oem_check		= x2apic_acpi_madt_oem_check,
-	.apic_id_valid			= x2apic_apic_id_valid,
-	.apic_id_registered		= x2apic_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,
 
 	.disable_esr			= 0,
 
-	.check_apicid_used		= NULL,
-	.init_apic_ldr			= init_x2apic_ldr,
-	.ioapic_phys_id_map		= NULL,
-	.setup_apic_routing		= NULL,
 	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
-	.apicid_to_cpu_present		= NULL,
-	.check_phys_apicid_present	= default_check_phys_apicid_present,
 	.phys_pkg_id			= x2apic_phys_pkg_id,
 
+	.max_apic_id			= UINT_MAX,
+	.x2apic_set_max_apicid		= true,
 	.get_apic_id			= x2apic_get_apic_id,
 	.set_apic_id			= x2apic_set_apic_id,
 
@@ -189,15 +167,11 @@ static struct apic apic_x2apic_phys __ro_after_init = {
 	.send_IPI_all			= x2apic_send_IPI_all,
 	.send_IPI_self			= x2apic_send_IPI_self,
 
-	.inquire_remote_apic		= NULL,
-
 	.read				= native_apic_msr_read,
 	.write				= native_apic_msr_write,
-	.eoi_write			= native_apic_msr_eoi_write,
+	.eoi				= native_apic_msr_eoi,
 	.icr_read			= native_x2apic_icr_read,
 	.icr_write			= native_x2apic_icr_write,
-	.wait_icr_idle			= native_x2apic_wait_icr_idle,
-	.safe_wait_icr_idle		= native_safe_x2apic_wait_icr_idle,
 };
 
 apic_driver(apic_x2apic_phys);
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index b524dee1cbbb..d9f5d7492f83 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -25,6 +25,8 @@
 #include <asm/uv/uv.h>
 #include <asm/apic.h>
 
+#include "local.h"
+
 static enum uv_system_type	uv_system_type;
 static int			uv_hubbed_system;
 static int			uv_hubless_system;
@@ -777,30 +779,6 @@ static void uv_send_IPI_all(int vector)
 	uv_send_IPI_mask(cpu_online_mask, vector);
 }
 
-static int uv_apic_id_valid(u32 apicid)
-{
-	return 1;
-}
-
-static int uv_apic_id_registered(void)
-{
-	return 1;
-}
-
-static void uv_init_apic_ldr(void)
-{
-}
-
-static u32 apic_uv_calc_apicid(unsigned int cpu)
-{
-	return apic_default_calc_apicid(cpu);
-}
-
-static unsigned int x2apic_get_apic_id(unsigned long id)
-{
-	return id;
-}
-
 static u32 set_apic_id(unsigned int id)
 {
 	return id;
@@ -816,11 +794,6 @@ static int uv_phys_pkg_id(int initial_apicid, int index_msb)
 	return uv_read_apic_id() >> index_msb;
 }
 
-static void uv_send_IPI_self(int vector)
-{
-	apic_write(APIC_SELF_IPI, vector);
-}
-
 static int uv_probe(void)
 {
 	return apic == &apic_x2apic_uv_x;
@@ -831,45 +804,35 @@ static struct apic apic_x2apic_uv_x __ro_after_init = {
 	.name				= "UV large system",
 	.probe				= uv_probe,
 	.acpi_madt_oem_check		= uv_acpi_madt_oem_check,
-	.apic_id_valid			= uv_apic_id_valid,
-	.apic_id_registered		= uv_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,
 
 	.disable_esr			= 0,
 
-	.check_apicid_used		= NULL,
-	.init_apic_ldr			= uv_init_apic_ldr,
-	.ioapic_phys_id_map		= NULL,
-	.setup_apic_routing		= NULL,
 	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
-	.apicid_to_cpu_present		= NULL,
-	.check_phys_apicid_present	= default_check_phys_apicid_present,
 	.phys_pkg_id			= uv_phys_pkg_id,
 
+	.max_apic_id			= UINT_MAX,
 	.get_apic_id			= x2apic_get_apic_id,
 	.set_apic_id			= set_apic_id,
 
-	.calc_dest_apicid		= apic_uv_calc_apicid,
+	.calc_dest_apicid		= apic_default_calc_apicid,
 
 	.send_IPI			= uv_send_IPI_one,
 	.send_IPI_mask			= uv_send_IPI_mask,
 	.send_IPI_mask_allbutself	= uv_send_IPI_mask_allbutself,
 	.send_IPI_allbutself		= uv_send_IPI_allbutself,
 	.send_IPI_all			= uv_send_IPI_all,
-	.send_IPI_self			= uv_send_IPI_self,
+	.send_IPI_self			= x2apic_send_IPI_self,
 
 	.wakeup_secondary_cpu		= uv_wakeup_secondary,
-	.inquire_remote_apic		= NULL,
 
 	.read				= native_apic_msr_read,
 	.write				= native_apic_msr_write,
-	.eoi_write			= native_apic_msr_eoi_write,
+	.eoi				= native_apic_msr_eoi,
 	.icr_read			= native_x2apic_icr_read,
 	.icr_write			= native_x2apic_icr_write,
-	.wait_icr_idle			= native_x2apic_wait_icr_idle,
-	.safe_wait_icr_idle		= native_safe_x2apic_wait_icr_idle,
 };
 
 #define	UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_LENGTH	3
@@ -1844,7 +1807,7 @@ static void __init uv_system_init_hub(void)
 
 	/* Initialize per CPU info: */
 	for_each_possible_cpu(cpu) {
-		int apicid = early_per_cpu(x86_cpu_to_apicid, cpu);
+		int apicid = per_cpu(x86_cpu_to_apicid, cpu);
 		unsigned short bid;
 		unsigned short pnode;
 
diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c
index 485441b7f030..bfeb18fad63f 100644
--- a/arch/x86/kernel/cpu/acrn.c
+++ b/arch/x86/kernel/cpu/acrn.c
@@ -51,7 +51,7 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_acrn_hv_callback)
 	 * will block the interrupt whose vector is lower than
 	 * HYPERVISOR_CALLBACK_VECTOR.
 	 */
-	ack_APIC_irq();
+	apic_eoi();
 	inc_irq_stat(irq_hv_callback_count);
 
 	if (acrn_intr_handler)
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 7eca6a8abbb1..dd8379d84445 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -1047,7 +1047,7 @@ static void init_amd(struct cpuinfo_x86 *c)
 		set_cpu_cap(c, X86_FEATURE_FSRS);
 
 	/* get apicid instead of initial apic id from cpuid */
-	c->apicid = hard_smp_processor_id();
+	c->apicid = read_apic_id();
 
 	/* K6s reports MCEs but don't actually have all the MSRs */
 	if (c->x86 < 6)
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 41b573f34a10..90b8c5ea25aa 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1958,7 +1958,7 @@ void enable_sep_cpu(void)
 }
 #endif
 
-void __init identify_boot_cpu(void)
+static __init void identify_boot_cpu(void)
 {
 	identify_cpu(&boot_cpu_data);
 	if (HAS_KERNEL_IBT && cpu_feature_enabled(X86_FEATURE_IBT))
diff --git a/arch/x86/kernel/cpu/hygon.c b/arch/x86/kernel/cpu/hygon.c
index 5a2962c492d3..defdc594be14 100644
--- a/arch/x86/kernel/cpu/hygon.c
+++ b/arch/x86/kernel/cpu/hygon.c
@@ -8,6 +8,7 @@
  */
 #include <linux/io.h>
 
+#include <asm/apic.h>
 #include <asm/cpu.h>
 #include <asm/smp.h>
 #include <asm/numa.h>
@@ -300,7 +301,7 @@ static void init_hygon(struct cpuinfo_x86 *c)
 	set_cpu_cap(c, X86_FEATURE_REP_GOOD);
 
 	/* get apicid instead of initial apic id from cpuid */
-	c->apicid = hard_smp_processor_id();
+	c->apicid = read_apic_id();
 
 	/*
 	 * XXX someone from Hygon needs to confirm this DTRT
diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index c4ec4ca47e11..c267f43de39e 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -759,7 +759,7 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_deferred_error)
 	inc_irq_stat(irq_deferred_error_count);
 	deferred_error_int_vector();
 	trace_deferred_error_apic_exit(DEFERRED_ERROR_VECTOR);
-	ack_APIC_irq();
+	apic_eoi();
 }
 
 /*
diff --git a/arch/x86/kernel/cpu/mce/inject.c b/arch/x86/kernel/cpu/mce/inject.c
index 12cf2e7ca33c..4d8d4bcf915d 100644
--- a/arch/x86/kernel/cpu/mce/inject.c
+++ b/arch/x86/kernel/cpu/mce/inject.c
@@ -270,8 +270,7 @@ static void __maybe_unused raise_mce(struct mce *m)
 					mce_irq_ipi, NULL, 0);
 				preempt_enable();
 			} else if (m->inject_flags & MCJ_NMI_BROADCAST)
-				apic->send_IPI_mask(mce_inject_cpumask,
-						NMI_VECTOR);
+				__apic_send_IPI_mask(mce_inject_cpumask, NMI_VECTOR);
 		}
 		start = jiffies;
 		while (!cpumask_empty(mce_inject_cpumask)) {
diff --git a/arch/x86/kernel/cpu/mce/threshold.c b/arch/x86/kernel/cpu/mce/threshold.c
index 6a059a035021..ef4e7bb5fd88 100644
--- a/arch/x86/kernel/cpu/mce/threshold.c
+++ b/arch/x86/kernel/cpu/mce/threshold.c
@@ -27,5 +27,5 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_threshold)
 	inc_irq_stat(irq_threshold_count);
 	mce_threshold_vector();
 	trace_threshold_apic_exit(THRESHOLD_APIC_VECTOR);
-	ack_APIC_irq();
+	apic_eoi();
 }
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index c7969e806c64..0100468e72ca 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -119,7 +119,7 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_hyperv_callback)
 		vmbus_handler();
 
 	if (ms_hyperv.hints & HV_DEPRECATING_AEOI_RECOMMENDED)
-		ack_APIC_irq();
+		apic_eoi();
 
 	set_irq_regs(old_regs);
 }
@@ -147,7 +147,7 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_hyperv_stimer0)
 	if (hv_stimer0_handler)
 		hv_stimer0_handler();
 	add_interrupt_randomness(HYPERV_STIMER0_VECTOR);
-	ack_APIC_irq();
+	apic_eoi();
 
 	set_irq_regs(old_regs);
 }
diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index 28da5dd83fc0..87d38f17ff5c 100644
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -128,16 +128,15 @@ static void __init dtb_setup_hpet(void)
 static void __init dtb_cpu_setup(void)
 {
 	struct device_node *dn;
-	u32 apic_id, version;
+	u32 apic_id;
 
-	version = GET_APIC_VERSION(apic_read(APIC_LVR));
 	for_each_of_cpu_node(dn) {
 		apic_id = of_get_cpu_hwid(dn, 0);
 		if (apic_id == ~0U) {
 			pr_warn("%pOF: missing local APIC ID\n", dn);
 			continue;
 		}
-		generic_processor_info(apic_id, version);
+		generic_processor_info(apic_id);
 	}
 }
 
@@ -158,19 +157,15 @@ static void __init dtb_lapic_setup(void)
 
 	/* Did the boot loader setup the local APIC ? */
 	if (!boot_cpu_has(X86_FEATURE_APIC)) {
-		if (apic_force_enable(lapic_addr))
+		/* Try force enabling, which registers the APIC address */
+		if (!apic_force_enable(lapic_addr))
 			return;
-	}
-	smp_found_config = 1;
-	if (of_property_read_bool(dn, "intel,virtual-wire-mode")) {
-		pr_info("Virtual Wire compatibility mode.\n");
-		pic_mode = 0;
 	} else {
-		pr_info("IMCR and PIC compatibility mode.\n");
-		pic_mode = 1;
+		register_lapic_address(lapic_addr);
 	}
-
-	register_lapic_address(lapic_addr);
+	smp_found_config = 1;
+	pic_mode = !of_property_read_bool(dn, "intel,virtual-wire-mode");
+	pr_info("%s compatibility mode.\n", pic_mode ? "IMCR and PIC" : "Virtual Wire");
 }
 
 #endif /* CONFIG_X86_LOCAL_APIC */
diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index a58c6bc1cd68..f3958262c725 100644
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -131,7 +131,6 @@ static const __initconst struct idt_data apic_idts[] = {
 	INTG(RESCHEDULE_VECTOR,			asm_sysvec_reschedule_ipi),
 	INTG(CALL_FUNCTION_VECTOR,		asm_sysvec_call_function),
 	INTG(CALL_FUNCTION_SINGLE_VECTOR,	asm_sysvec_call_function_single),
-	INTG(IRQ_MOVE_CLEANUP_VECTOR,		asm_sysvec_irq_move_cleanup),
 	INTG(REBOOT_VECTOR,			asm_sysvec_reboot),
 #endif
 
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 9f668d2f3d11..11761c124545 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -49,7 +49,7 @@ void ack_bad_irq(unsigned int irq)
 	 * completely.
 	 * But only ack when the APIC is enabled -AK
 	 */
-	ack_APIC_irq();
+	apic_eoi();
 }
 
 #define irq_stats(x)		(&per_cpu(irq_stat, x))
@@ -256,7 +256,7 @@ DEFINE_IDTENTRY_IRQ(common_interrupt)
 	if (likely(!IS_ERR_OR_NULL(desc))) {
 		handle_irq(desc, regs);
 	} else {
-		ack_APIC_irq();
+		apic_eoi();
 
 		if (desc == VECTOR_UNUSED) {
 			pr_emerg_ratelimited("%s: %d.%u No irq handler for vector\n",
@@ -280,7 +280,7 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_x86_platform_ipi)
 {
 	struct pt_regs *old_regs = set_irq_regs(regs);
 
-	ack_APIC_irq();
+	apic_eoi();
 	trace_x86_platform_ipi_entry(X86_PLATFORM_IPI_VECTOR);
 	inc_irq_stat(x86_platform_ipis);
 	if (x86_platform_ipi_callback)
@@ -310,7 +310,7 @@ EXPORT_SYMBOL_GPL(kvm_set_posted_intr_wakeup_handler);
  */
 DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_kvm_posted_intr_ipi)
 {
-	ack_APIC_irq();
+	apic_eoi();
 	inc_irq_stat(kvm_posted_intr_ipis);
 }
 
@@ -319,7 +319,7 @@ DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_kvm_posted_intr_ipi)
  */
 DEFINE_IDTENTRY_SYSVEC(sysvec_kvm_posted_intr_wakeup_ipi)
 {
-	ack_APIC_irq();
+	apic_eoi();
 	inc_irq_stat(kvm_posted_intr_wakeup_ipis);
 	kvm_posted_intr_wakeup_handler();
 }
@@ -329,7 +329,7 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_kvm_posted_intr_wakeup_ipi)
  */
 DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_kvm_posted_intr_nested_ipi)
 {
-	ack_APIC_irq();
+	apic_eoi();
 	inc_irq_stat(kvm_posted_intr_nested_ipis);
 }
 #endif
@@ -401,6 +401,6 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_thermal)
 	inc_irq_stat(irq_thermal_count);
 	smp_thermal_vector();
 	trace_thermal_apic_exit(THERMAL_APIC_VECTOR);
-	ack_APIC_irq();
+	apic_eoi();
 }
 #endif
diff --git a/arch/x86/kernel/irq_work.c b/arch/x86/kernel/irq_work.c
index 890d4778cd35..b0a24deab4a1 100644
--- a/arch/x86/kernel/irq_work.c
+++ b/arch/x86/kernel/irq_work.c
@@ -16,7 +16,7 @@
 #ifdef CONFIG_X86_LOCAL_APIC
 DEFINE_IDTENTRY_SYSVEC(sysvec_irq_work)
 {
-	ack_APIC_irq();
+	apic_eoi();
 	trace_irq_work_entry(IRQ_WORK_VECTOR);
 	inc_irq_stat(apic_irq_work_irqs);
 	irq_work_run();
@@ -28,7 +28,7 @@ void arch_irq_work_raise(void)
 	if (!arch_irq_work_has_interrupt())
 		return;
 
-	apic->send_IPI_self(IRQ_WORK_VECTOR);
+	__apic_send_IPI_self(IRQ_WORK_VECTOR);
 	apic_wait_icr_idle();
 }
 #endif
diff --git a/arch/x86/kernel/jailhouse.c b/arch/x86/kernel/jailhouse.c
index 4eb8f2d19a87..578d16fc040f 100644
--- a/arch/x86/kernel/jailhouse.c
+++ b/arch/x86/kernel/jailhouse.c
@@ -101,10 +101,8 @@ static void __init jailhouse_get_smp_config(unsigned int early)
 
 	register_lapic_address(0xfee00000);
 
-	for (cpu = 0; cpu < setup_data.v1.num_cpus; cpu++) {
-		generic_processor_info(setup_data.v1.cpu_ids[cpu],
-				       boot_cpu_apic_version);
-	}
+	for (cpu = 0; cpu < setup_data.v1.num_cpus; cpu++)
+		generic_processor_info(setup_data.v1.cpu_ids[cpu]);
 
 	smp_found_config = 1;
 
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 526d4da3dcd4..b8ab9ee5896c 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -291,7 +291,7 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_kvm_asyncpf_interrupt)
 	struct pt_regs *old_regs = set_irq_regs(regs);
 	u32 token;
 
-	ack_APIC_irq();
+	apic_eoi();
 
 	inc_irq_stat(irq_hv_callback_count);
 
@@ -332,7 +332,7 @@ static void kvm_register_steal_time(void)
 
 static DEFINE_PER_CPU_DECRYPTED(unsigned long, kvm_apic_eoi) = KVM_PV_EOI_DISABLED;
 
-static notrace void kvm_guest_apic_eoi_write(u32 reg, u32 val)
+static notrace __maybe_unused void kvm_guest_apic_eoi_write(void)
 {
 	/**
 	 * This relies on __test_and_clear_bit to modify the memory
@@ -343,7 +343,7 @@ static notrace void kvm_guest_apic_eoi_write(u32 reg, u32 val)
 	 */
 	if (__test_and_clear_bit(KVM_PV_EOI_BIT, this_cpu_ptr(&kvm_apic_eoi)))
 		return;
-	apic->native_eoi_write(APIC_EOI, APIC_EOI_ACK);
+	apic_native_eoi();
 }
 
 static void kvm_guest_cpu_init(void)
@@ -622,10 +622,10 @@ late_initcall(setup_efi_kvm_sev_migration);
 /*
  * Set the IPI entry points
  */
-static void kvm_setup_pv_ipi(void)
+static __init void kvm_setup_pv_ipi(void)
 {
-	apic->send_IPI_mask = kvm_send_ipi_mask;
-	apic->send_IPI_mask_allbutself = kvm_send_ipi_mask_allbutself;
+	apic_update_callback(send_IPI_mask, kvm_send_ipi_mask);
+	apic_update_callback(send_IPI_mask_allbutself, kvm_send_ipi_mask_allbutself);
 	pr_info("setup PV IPIs\n");
 }
 
@@ -825,7 +825,7 @@ static void __init kvm_guest_init(void)
 	}
 
 	if (kvm_para_has_feature(KVM_FEATURE_PV_EOI))
-		apic_set_eoi_write(kvm_guest_apic_eoi_write);
+		apic_update_callback(eoi, kvm_guest_apic_eoi_write);
 
 	if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF_INT) && kvmapf) {
 		static_branch_enable(&kvm_async_pf_enabled);
diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index fed721f90116..b223922248e9 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -48,7 +48,6 @@ static int __init mpf_checksum(unsigned char *mp, int len)
 
 static void __init MP_processor_info(struct mpc_cpu *m)
 {
-	int apicid;
 	char *bootup_cpu = "";
 
 	if (!(m->cpuflag & CPU_ENABLED)) {
@@ -56,15 +55,11 @@ static void __init MP_processor_info(struct mpc_cpu *m)
 		return;
 	}
 
-	apicid = m->apicid;
-
-	if (m->cpuflag & CPU_BOOTPROCESSOR) {
+	if (m->cpuflag & CPU_BOOTPROCESSOR)
 		bootup_cpu = " (Bootup-CPU)";
-		boot_cpu_physical_apicid = m->apicid;
-	}
 
 	pr_info("Processor #%d%s\n", m->apicid, bootup_cpu);
-	generic_processor_info(apicid, m->apicver);
+	generic_processor_info(m->apicid);
 }
 
 #ifdef CONFIG_X86_IO_APIC
@@ -380,11 +375,6 @@ static inline void __init construct_default_ISA_mptable(int mpc_default_type)
 	int i;
 
 	/*
-	 * local APIC has default address
-	 */
-	mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
-
-	/*
 	 * 2 CPUs, numbered 0 & 1.
 	 */
 	processor.type = MP_PROCESSOR;
@@ -525,10 +515,8 @@ void __init default_get_smp_config(unsigned int early)
 	 */
 	if (mpf->feature1) {
 		if (early) {
-			/*
-			 * local APIC has default address
-			 */
-			mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
+			/* Local APIC has default address */
+			register_lapic_address(APIC_DEFAULT_PHYS_BASE);
 			goto out;
 		}
 
diff --git a/arch/x86/kernel/nmi_selftest.c b/arch/x86/kernel/nmi_selftest.c
index a1a96df3dff1..e93a8545c74d 100644
--- a/arch/x86/kernel/nmi_selftest.c
+++ b/arch/x86/kernel/nmi_selftest.c
@@ -75,7 +75,7 @@ static void __init test_nmi_ipi(struct cpumask *mask)
 	/* sync above data before sending NMI */
 	wmb();
 
-	apic->send_IPI_mask(mask, NMI_VECTOR);
+	__apic_send_IPI_mask(mask, NMI_VECTOR);
 
 	/* Don't wait longer than a second */
 	timeout = USEC_PER_SEC;
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index fd975a4a5200..b9145a63da77 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -114,7 +114,6 @@ static struct resource bss_resource = {
 #ifdef CONFIG_X86_32
 /* CPU data as detected by the assembly code in head_32.S */
 struct cpuinfo_x86 new_cpu_data;
-unsigned int def_to_bigsmp;
 
 struct apm_info apm_info;
 EXPORT_SYMBOL(apm_info);
@@ -1018,9 +1017,11 @@ void __init setup_arch(char **cmdline_p)
 
 	x86_report_nx();
 
+	apic_setup_apic_calls();
+
 	if (acpi_mps_check()) {
 #ifdef CONFIG_X86_LOCAL_APIC
-		disable_apic = 1;
+		apic_is_disabled = true;
 #endif
 		setup_clear_cpu_cap(X86_FEATURE_APIC);
 	}
@@ -1253,7 +1254,7 @@ void __init setup_arch(char **cmdline_p)
 
 	map_vsyscall();
 
-	generic_apic_probe();
+	x86_32_probe_apic();
 
 	early_quirks();
 
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index c242dc47e9cb..2c97bf7b56ae 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -181,15 +181,9 @@ void __init setup_per_cpu_areas(void)
 #ifdef CONFIG_X86_LOCAL_APIC
 		per_cpu(x86_cpu_to_apicid, cpu) =
 			early_per_cpu_map(x86_cpu_to_apicid, cpu);
-		per_cpu(x86_bios_cpu_apicid, cpu) =
-			early_per_cpu_map(x86_bios_cpu_apicid, cpu);
 		per_cpu(x86_cpu_to_acpiid, cpu) =
 			early_per_cpu_map(x86_cpu_to_acpiid, cpu);
 #endif
-#ifdef CONFIG_X86_32
-		per_cpu(x86_cpu_to_logical_apicid, cpu) =
-			early_per_cpu_map(x86_cpu_to_logical_apicid, cpu);
-#endif
 #ifdef CONFIG_NUMA
 		per_cpu(x86_cpu_to_node_map, cpu) =
 			early_per_cpu_map(x86_cpu_to_node_map, cpu);
@@ -214,12 +208,8 @@ void __init setup_per_cpu_areas(void)
 	/* indicate the early static arrays will soon be gone */
 #ifdef CONFIG_X86_LOCAL_APIC
 	early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
-	early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
 	early_per_cpu_ptr(x86_cpu_to_acpiid) = NULL;
 #endif
-#ifdef CONFIG_X86_32
-	early_per_cpu_ptr(x86_cpu_to_logical_apicid) = NULL;
-#endif
 #ifdef CONFIG_NUMA
 	early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
 #endif
diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
index d380c9399480..2787826d9f60 100644
--- a/arch/x86/kernel/sev.c
+++ b/arch/x86/kernel/sev.c
@@ -1089,7 +1089,7 @@ static int wakeup_cpu_via_vmgexit(int apic_id, unsigned long start_ip)
 	return ret;
 }
 
-void snp_set_wakeup_secondary_cpu(void)
+void __init snp_set_wakeup_secondary_cpu(void)
 {
 	if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP))
 		return;
@@ -1099,7 +1099,7 @@ void snp_set_wakeup_secondary_cpu(void)
 	 * required method to start APs under SNP. If the hypervisor does
 	 * not support AP creation, then no APs will be started.
 	 */
-	apic->wakeup_secondary_cpu = wakeup_cpu_via_vmgexit;
+	apic_update_callback(wakeup_secondary_cpu, wakeup_cpu_via_vmgexit);
 }
 
 int __init sev_es_setup_ap_jump_table(struct real_mode_header *rmh)
diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c
index 7eb18ca7bd45..6eb06d001bcc 100644
--- a/arch/x86/kernel/smp.c
+++ b/arch/x86/kernel/smp.c
@@ -135,7 +135,7 @@ static int smp_stop_nmi_callback(unsigned int val, struct pt_regs *regs)
  */
 DEFINE_IDTENTRY_SYSVEC(sysvec_reboot)
 {
-	ack_APIC_irq();
+	apic_eoi();
 	cpu_emergency_disable_virtualization();
 	stop_this_cpu(NULL);
 }
@@ -237,7 +237,7 @@ static void native_stop_other_cpus(int wait)
 			pr_emerg("Shutting down cpus with NMI\n");
 
 			for_each_cpu(cpu, &cpus_stop_mask)
-				apic->send_IPI(cpu, NMI_VECTOR);
+				__apic_send_IPI(cpu, NMI_VECTOR);
 		}
 		/*
 		 * Don't wait longer than 10 ms if the caller didn't
@@ -268,7 +268,7 @@ done:
  */
 DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_reschedule_ipi)
 {
-	ack_APIC_irq();
+	apic_eoi();
 	trace_reschedule_entry(RESCHEDULE_VECTOR);
 	inc_irq_stat(irq_resched_count);
 	scheduler_ipi();
@@ -277,7 +277,7 @@ DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_reschedule_ipi)
 
 DEFINE_IDTENTRY_SYSVEC(sysvec_call_function)
 {
-	ack_APIC_irq();
+	apic_eoi();
 	trace_call_function_entry(CALL_FUNCTION_VECTOR);
 	inc_irq_stat(irq_call_count);
 	generic_smp_call_function_interrupt();
@@ -286,7 +286,7 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_call_function)
 
 DEFINE_IDTENTRY_SYSVEC(sysvec_call_function_single)
 {
-	ack_APIC_irq();
+	apic_eoi();
 	trace_call_function_single_entry(CALL_FUNCTION_SINGLE_VECTOR);
 	inc_irq_stat(irq_call_count);
 	generic_smp_call_function_single_interrupt();
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 6b0604e9fe7c..d7667a29acf3 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -761,44 +761,6 @@ static void impress_friends(void)
 	pr_debug("Before bogocount - setting activated=1\n");
 }
 
-void __inquire_remote_apic(int apicid)
-{
-	unsigned i, regs[] = { APIC_ID >> 4, APIC_LVR >> 4, APIC_SPIV >> 4 };
-	const char * const names[] = { "ID", "VERSION", "SPIV" };
-	int timeout;
-	u32 status;
-
-	pr_info("Inquiring remote APIC 0x%x...\n", apicid);
-
-	for (i = 0; i < ARRAY_SIZE(regs); i++) {
-		pr_info("... APIC 0x%x %s: ", apicid, names[i]);
-
-		/*
-		 * Wait for idle.
-		 */
-		status = safe_apic_wait_icr_idle();
-		if (status)
-			pr_cont("a previous APIC delivery may have failed\n");
-
-		apic_icr_write(APIC_DM_REMRD | regs[i], apicid);
-
-		timeout = 0;
-		do {
-			udelay(100);
-			status = apic_read(APIC_ICR) & APIC_ICR_RR_MASK;
-		} while (status == APIC_ICR_RR_INPROG && timeout++ < 1000);
-
-		switch (status) {
-		case APIC_ICR_RR_VALID:
-			status = apic_read(APIC_RRR);
-			pr_cont("%08x\n", status);
-			break;
-		default:
-			pr_cont("failed\n");
-		}
-	}
-}
-
 /*
  * The Multiprocessor Specification 1.4 (1997) example code suggests
  * that there should be a 10ms delay between the BSP asserting INIT
@@ -1089,9 +1051,8 @@ int native_kick_ap(unsigned int cpu, struct task_struct *tidle)
 
 	pr_debug("++++++++++++++++++++=_---CPU UP  %u\n", cpu);
 
-	if (apicid == BAD_APICID ||
-	    !physid_isset(apicid, phys_cpu_present_map) ||
-	    !apic->apic_id_valid(apicid)) {
+	if (apicid == BAD_APICID || !physid_isset(apicid, phys_cpu_present_map) ||
+	    !apic_id_valid(apicid)) {
 		pr_err("%s: bad cpu %d\n", __func__, cpu);
 		return -EINVAL;
 	}
@@ -1174,58 +1135,6 @@ static __init void disable_smp(void)
 	cpumask_set_cpu(0, topology_die_cpumask(0));
 }
 
-/*
- * Various sanity checks.
- */
-static void __init smp_sanity_check(void)
-{
-	preempt_disable();
-
-#if !defined(CONFIG_X86_BIGSMP) && defined(CONFIG_X86_32)
-	if (def_to_bigsmp && nr_cpu_ids > 8) {
-		unsigned int cpu;
-		unsigned nr;
-
-		pr_warn("More than 8 CPUs detected - skipping them\n"
-			"Use CONFIG_X86_BIGSMP\n");
-
-		nr = 0;
-		for_each_present_cpu(cpu) {
-			if (nr >= 8)
-				set_cpu_present(cpu, false);
-			nr++;
-		}
-
-		nr = 0;
-		for_each_possible_cpu(cpu) {
-			if (nr >= 8)
-				set_cpu_possible(cpu, false);
-			nr++;
-		}
-
-		set_nr_cpu_ids(8);
-	}
-#endif
-
-	if (!physid_isset(hard_smp_processor_id(), phys_cpu_present_map)) {
-		pr_warn("weird, boot CPU (#%d) not listed by the BIOS\n",
-			hard_smp_processor_id());
-
-		physid_set(hard_smp_processor_id(), phys_cpu_present_map);
-	}
-
-	/*
-	 * Should not be necessary because the MP table should list the boot
-	 * CPU too, but we do it for the sake of robustness anyway.
-	 */
-	if (!apic->check_phys_apicid_present(boot_cpu_physical_apicid)) {
-		pr_notice("weird, boot CPU (#%d) not listed by the BIOS\n",
-			  boot_cpu_physical_apicid);
-		physid_set(hard_smp_processor_id(), phys_cpu_present_map);
-	}
-	preempt_enable();
-}
-
 static void __init smp_cpu_index_default(void)
 {
 	int i;
@@ -1285,8 +1194,6 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
 {
 	smp_prepare_cpus_common();
 
-	smp_sanity_check();
-
 	switch (apic_intr_mode) {
 	case APIC_PIC:
 	case APIC_VIRTUAL_WIRE_NO_CONFIG:
@@ -1422,24 +1329,6 @@ __init void prefill_possible_map(void)
 {
 	int i, possible;
 
-	/* No boot processor was found in mptable or ACPI MADT */
-	if (!num_processors) {
-		if (boot_cpu_has(X86_FEATURE_APIC)) {
-			int apicid = boot_cpu_physical_apicid;
-			int cpu = hard_smp_processor_id();
-
-			pr_warn("Boot CPU (id %d) not listed by BIOS\n", cpu);
-
-			/* Make sure boot cpu is enumerated */
-			if (apic->cpu_present_to_apicid(0) == BAD_APICID &&
-			    apic->apic_id_valid(apicid))
-				generic_processor_info(apicid, boot_cpu_apic_version);
-		}
-
-		if (!num_processors)
-			num_processors = 1;
-	}
-
 	i = setup_max_cpus ?: 1;
 	if (setup_possible_cpus == -1) {
 		possible = num_processors;
diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
index 796cfaa46bfa..65e96b76c423 100644
--- a/arch/x86/kernel/vsmp_64.c
+++ b/arch/x86/kernel/vsmp_64.c
@@ -129,7 +129,7 @@ static void __init vsmp_cap_cpus(void)
 
 static int apicid_phys_pkg_id(int initial_apic_id, int index_msb)
 {
-	return hard_smp_processor_id() >> index_msb;
+	return read_apic_id() >> index_msb;
 }
 
 static void vsmp_apic_post_init(void)