x86/apic: Sanitize APIC ID range validation

Now that everything has apic::max_apic_id set and the eventual update for
the x2APIC case is in place, switch the apic_id_valid() helper to use
apic::max_apic_id and remove the apic::apic_id_valid() callback.

[ dhansen: Fix subject typo ]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Tested-by: Juergen Gross <jgross@suse.com> # Xen PV (dom0 and unpriv. guest)

arch/x86/include/asm/apic.h

@@ -284,7 +284,6 @@ struct apic {
 	/* Probe, setup and smpboot functions */
 	int	(*probe)(void);
 	int	(*acpi_madt_oem_check)(char *oem_id, char *oem_table_id);
-	int	(*apic_id_valid)(u32 apicid);
 	bool	(*apic_id_registered)(void);
 
 	bool	(*check_apicid_used)(physid_mask_t *map, int apicid);
@@ -378,7 +377,7 @@ static inline u32 safe_apic_wait_icr_idle(void)
 
 static inline bool apic_id_valid(u32 apic_id)
 {
-	return apic->apic_id_valid(apic_id);
+	return apic_id <= apic->max_apic_id;
 }
 
 extern void __init apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v));

arch/x86/kernel/apic/apic_common.c

@@ -37,11 +37,6 @@ int default_cpu_present_to_apicid(int mps_cpu)
 }
 EXPORT_SYMBOL_GPL(default_cpu_present_to_apicid);
 
-int default_apic_id_valid(u32 apicid)
-{
-	return (apicid < 255);
-}
-
 bool default_apic_id_registered(void)
 {
 	return physid_isset(read_apic_id(), phys_cpu_present_map);

arch/x86/kernel/apic/apic_flat_64.c

@@ -80,7 +80,6 @@ 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		= default_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
@@ -158,7 +157,6 @@ 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		= default_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,

arch/x86/kernel/apic/apic_noop.c

@@ -67,8 +67,6 @@ struct apic apic_noop __ro_after_init = {
 	.probe				= noop_probe,
 	.acpi_madt_oem_check		= NULL,
 
-	.apic_id_valid			= default_apic_id_valid,
-
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= true,
 

arch/x86/kernel/apic/apic_numachip.c

@@ -56,12 +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_phys_pkg_id(int initial_apic_id, int index_msb)
 {
 	return initial_apic_id >> index_msb;
@@ -227,7 +221,6 @@ 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,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,
@@ -267,7 +260,6 @@ 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,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,

arch/x86/kernel/apic/bigsmp_32.c

@@ -79,7 +79,6 @@ static struct apic apic_bigsmp __ro_after_init = {
 
 	.name				= "bigsmp",
 	.probe				= probe_bigsmp,
-	.apic_id_valid			= default_apic_id_valid,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,

arch/x86/kernel/apic/local.h

@@ -14,7 +14,6 @@
 #include <asm/apic.h>
 
 /* X2APIC */
-int x2apic_apic_id_valid(u32 apicid);
 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);

arch/x86/kernel/apic/probe_32.c

@@ -33,7 +33,6 @@ static struct apic apic_default __ro_after_init = {
 
 	.name				= "default",
 	.probe				= probe_default,
-	.apic_id_valid			= default_apic_id_valid,
 	.apic_id_registered		= default_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,

arch/x86/kernel/apic/x2apic_cluster.c

@@ -226,7 +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,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= true,

arch/x86/kernel/apic/x2apic_phys.c

@@ -124,12 +124,6 @@ static int x2apic_phys_probe(void)
 	return apic == &apic_x2apic_phys;
 }
 
-/* Common x2apic functions, also used by x2apic_cluster */
-int x2apic_apic_id_valid(u32 apicid)
-{
-	return apicid <= x2apic_max_apicid;
-}
-
 unsigned int x2apic_get_apic_id(unsigned long id)
 {
 	return id;
@@ -150,7 +144,6 @@ 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,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,

arch/x86/kernel/apic/x2apic_uv_x.c

@@ -780,11 +780,6 @@ 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 u32 set_apic_id(unsigned int id)
 {
 	return id;
@@ -810,7 +805,6 @@ 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,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,

arch/x86/xen/apic.c

@@ -105,11 +105,6 @@ static int xen_madt_oem_check(char *oem_id, char *oem_table_id)
 	return xen_pv_domain();
 }
 
-static int xen_id_always_valid(u32 apicid)
-{
-	return 1;
-}
-
 static int xen_phys_pkg_id(int initial_apic_id, int index_msb)
 {
 	return initial_apic_id >> index_msb;
@@ -127,7 +122,6 @@ static struct apic xen_pv_apic = {
 	.name 				= "Xen PV",
 	.probe 				= xen_apic_probe_pv,
 	.acpi_madt_oem_check		= xen_madt_oem_check,
-	.apic_id_valid 			= xen_id_always_valid,
 
 	/* .delivery_mode and .dest_mode_logical not used by XENPV */