From: James Morse james.morse@arm.com
maillist inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8XMTL CVE: NA
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The code behind ACPI_HOTPLUG_CPU allows a not-present CPU to become present. This isn't the only use of HOTPLUG_CPU. On arm64 and riscv CPUs can be taken offline as a power saving measure.
On arm64 an offline CPU may be disabled by firmware, preventing it from being brought back online, but it remains present throughout.
Adding code to prevent user-space trying to online these disabled CPUs needs some additional terminology.
Rename the Kconfig symbol CONFIG_ACPI_HOTPLUG_PRESENT_CPU to reflect that it makes possible CPUs present.
HOTPLUG_CPU is untouched as this is only about the ACPI mechanism.
Signed-off-by: James Morse james.morse@arm.com Tested-by: Miguel Luis miguel.luis@oracle.com Tested-by: Vishnu Pajjuri vishnu@os.amperecomputing.com Tested-by: Jianyong Wu jianyong.wu@arm.com Signed-off-by: Russell King (Oracle) rmk+kernel@armlinux.org.uk Reviewed-by: Jonathan Cameron Jonathan.Cameron@huawei.com
Conflicts: arch/loongarch/configs/loongson3_defconfig Signed-off-by: liwei liwei728@huawei.com --- arch/loongarch/Kconfig | 2 +- arch/loongarch/kernel/acpi.c | 4 ++-- arch/x86/Kconfig | 2 +- arch/x86/kernel/acpi/boot.c | 4 ++-- drivers/acpi/Kconfig | 4 ++-- drivers/acpi/acpi_processor.c | 10 +++++----- include/linux/acpi.h | 6 +++--- 7 files changed, 16 insertions(+), 16 deletions(-)
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 55f1a9cd1691..d79641716229 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -5,7 +5,7 @@ config LOONGARCH select ACPI select ACPI_GENERIC_GSI if ACPI select ACPI_MCFG if ACPI - select ACPI_HOTPLUG_CPU if ACPI_PROCESSOR && HOTPLUG_CPU + select ACPI_HOTPLUG_PRESENT_CPU if ACPI_PROCESSOR && HOTPLUG_CPU select ACPI_PPTT if ACPI select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI select ARCH_BINFMT_ELF_STATE diff --git a/arch/loongarch/kernel/acpi.c b/arch/loongarch/kernel/acpi.c index 58819b017ba8..f453271e6add 100644 --- a/arch/loongarch/kernel/acpi.c +++ b/arch/loongarch/kernel/acpi.c @@ -291,7 +291,7 @@ void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size) memblock_reserve(addr, size); }
-#ifdef CONFIG_ACPI_HOTPLUG_CPU +#ifdef CONFIG_ACPI_HOTPLUG_PRESENT_CPU
#include <acpi/processor.h>
@@ -343,4 +343,4 @@ int acpi_unmap_cpu(int cpu) } EXPORT_SYMBOL(acpi_unmap_cpu);
-#endif /* CONFIG_ACPI_HOTPLUG_CPU */ +#endif /* CONFIG_ACPI_HOTPLUG_PRESENT_CPU */ diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 99b509aa19d5..3eb973e7ca91 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -60,7 +60,7 @@ config X86 # select ACPI_LEGACY_TABLES_LOOKUP if ACPI select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI - select ACPI_HOTPLUG_CPU if ACPI_PROCESSOR && HOTPLUG_CPU + select ACPI_HOTPLUG_PRESENT_CPU if ACPI_PROCESSOR && HOTPLUG_CPU select ARCH_32BIT_OFF_T if X86_32 select ARCH_CLOCKSOURCE_INIT select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index c55c0ef47a18..8202bd2d957d 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -817,7 +817,7 @@ static void __init acpi_set_irq_model_ioapic(void) /* * ACPI based hotplug support for CPU */ -#ifdef CONFIG_ACPI_HOTPLUG_CPU +#ifdef CONFIG_ACPI_HOTPLUG_PRESENT_CPU #include <acpi/processor.h>
static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid) @@ -866,7 +866,7 @@ int acpi_unmap_cpu(int cpu) return (0); } EXPORT_SYMBOL(acpi_unmap_cpu); -#endif /* CONFIG_ACPI_HOTPLUG_CPU */ +#endif /* CONFIG_ACPI_HOTPLUG_PRESENT_CPU */
int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base) { diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 8456d48ba702..417f9f3077d2 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -305,7 +305,7 @@ config ACPI_IPMI To compile this driver as a module, choose M here: the module will be called as acpi_ipmi.
-config ACPI_HOTPLUG_CPU +config ACPI_HOTPLUG_PRESENT_CPU bool depends on ACPI_PROCESSOR && HOTPLUG_CPU select ACPI_CONTAINER @@ -399,7 +399,7 @@ config ACPI_PCI_SLOT
config ACPI_CONTAINER bool "Container and Module Devices" - default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU) + default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_PRESENT_CPU) help This driver supports ACPI Container and Module devices (IDs ACPI0004, PNP0A05, and PNP0A06). diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index e7ed4730cbbe..c8e960ff0aca 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -183,7 +183,7 @@ static void __init acpi_pcc_cpufreq_init(void) {} #endif /* CONFIG_X86 */
/* Initialization */ -#ifdef CONFIG_ACPI_HOTPLUG_CPU +#ifdef CONFIG_ACPI_HOTPLUG_PRESENT_CPU static int acpi_processor_hotadd_init(struct acpi_processor *pr) { unsigned long long sta; @@ -228,7 +228,7 @@ static inline int acpi_processor_hotadd_init(struct acpi_processor *pr) { return -ENODEV; } -#endif /* CONFIG_ACPI_HOTPLUG_CPU */ +#endif /* CONFIG_ACPI_HOTPLUG_PRESENT_CPU */
static int acpi_processor_get_info(struct acpi_device *device) { @@ -461,7 +461,7 @@ static int acpi_processor_add(struct acpi_device *device, return result; }
-#ifdef CONFIG_ACPI_HOTPLUG_CPU +#ifdef CONFIG_ACPI_HOTPLUG_PRESENT_CPU /* Removal */ static void acpi_processor_remove(struct acpi_device *device) { @@ -505,7 +505,7 @@ static void acpi_processor_remove(struct acpi_device *device) free_cpumask_var(pr->throttling.shared_cpu_map); kfree(pr); } -#endif /* CONFIG_ACPI_HOTPLUG_CPU */ +#endif /* CONFIG_ACPI_HOTPLUG_PRESENT_CPU */
#ifdef CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC bool __init processor_physically_present(acpi_handle handle) @@ -630,7 +630,7 @@ static const struct acpi_device_id processor_device_ids[] = { static struct acpi_scan_handler processor_handler = { .ids = processor_device_ids, .attach = acpi_processor_add, -#ifdef CONFIG_ACPI_HOTPLUG_CPU +#ifdef CONFIG_ACPI_HOTPLUG_PRESENT_CPU .detach = acpi_processor_remove, #endif .hotplug = { diff --git a/include/linux/acpi.h b/include/linux/acpi.h index fbeec15a5083..2080280186bf 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -321,12 +321,12 @@ static inline int acpi_processor_evaluate_cst(acpi_handle handle, u32 cpu, } #endif
-#ifdef CONFIG_ACPI_HOTPLUG_CPU +#ifdef CONFIG_ACPI_HOTPLUG_PRESENT_CPU /* Arch dependent functions for cpu hotplug support */ int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id, int *pcpu); int acpi_unmap_cpu(int cpu); -#endif /* CONFIG_ACPI_HOTPLUG_CPU */ +#endif /* CONFIG_ACPI_HOTPLUG_PRESENT_CPU */
#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr); @@ -649,7 +649,7 @@ static inline u32 acpi_osc_ctx_get_cxl_control(struct acpi_osc_context *context) #define ACPI_GSB_ACCESS_ATTRIB_RAW_PROCESS 0x0000000F
/* Enable _OST when all relevant hotplug operations are enabled */ -#if defined(CONFIG_ACPI_HOTPLUG_CPU) && \ +#if defined(CONFIG_ACPI_HOTPLUG_PRESENT_CPU) && \ defined(CONFIG_ACPI_HOTPLUG_MEMORY) && \ defined(CONFIG_ACPI_CONTAINER) #define ACPI_HOTPLUG_OST