[PATCH OLK-6.6 v2 0/3] arm64: Support hardware xcall and xint

Jinjie Ruan

27 May 2025 27 May '25

9:10 a.m.

Support hardware xcall and xint. Jinjie Ruan (2): arm64: entry: Support hardware xcall and xint arm64: idle: Handle idle state for xcall/xint Liao Chang (1): arm64/Kconfig: Add turbo features submenuconfig arch/Kconfig | 65 --------------------- arch/arm64/Kconfig | 4 +- arch/arm64/Kconfig.turbo | 77 ++++++++++++++++++++++++ arch/arm64/configs/openeuler_defconfig | 14 +++-- arch/arm64/include/asm/actlr.h | 15 +++++ arch/arm64/include/asm/cpufeature.h | 8 +++ arch/arm64/include/asm/cpuidle.h | 32 ++++++++++ arch/arm64/include/asm/vectors.h | 1 + arch/arm64/kernel/cpufeature.c | 81 ++++++++++++++++++++++++++ arch/arm64/kernel/entry-common.c | 19 +++++- arch/arm64/kernel/entry.S | 52 ++++++++++++++++- arch/arm64/kernel/idle.c | 31 ++++++++++ arch/arm64/tools/cpucaps | 2 +- 13 files changed, 324 insertions(+), 77 deletions(-) create mode 100644 arch/arm64/Kconfig.turbo create mode 100644 arch/arm64/include/asm/actlr.h -- 2.34.1

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Jinjie Ruan

27 May 27 May

9:10 a.m.

New subject: [PATCH OLK-6.6 v2 1/3] arm64/Kconfig: Add turbo features submenuconfig

From: Liao Chang <liaochang1@huawei.com> hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/release-management/issues/IBV2E4 -------------------------------- This patch introduce a new submenu in 'Kernel Features' menu for turbo in-house features. This submenu includes some configs as below: - CONFIG_FAST_SYSCALL: It is a software optimization for reducing the syscall invocation cost. It has no hardware dependencies. In order to reduce the CPU cycles taken by exception level switching, kernel bypass some expensive operation for debugging and security features. - CONFIG_FAST_IRQ: It is a software optimzation for reducing the interrupt handling cost. It has no hardware dependencies. In order to reduce the CPU cycles taken by exception level switching, kernel bypass some expensive operations for debugging and security features. - CONFIG_DEBUG_FEATURE_BYPASS: This controls the debugger related operations bypassed upon CONFIG_FAST_SYSCALL or CONFIG_FAST_IRQ are enabled. - CONFIG_SECURITY_FEATURE_BYPASS: This controls the security related operation bypassed upon CONFIG_FAST_SYSCALL or CONFIG_FAST_IRQ are enabled. - CONFIG_ACTLR_XCALL_XINT: Hisilicon CPU uses the actlr xcall bit to control the offset to the exception vector base address for 'svc ffff' executed at EL0 and Hisilicon CPU uses the actlr xint bit to control the offset to the exception vector base address for the ARMv8.8 NMI taken from EL0. Signed-off-by: Liao Chang <liaochang1@huawei.com> Signed-off-by: Ruan Jinjie <ruanjinji@huawei.com> Signed-off-by: Zou Yipeng <zouyipeng@huawei.com> --- v6: - Make harware XCALL/XINT not depends on COMPAT. - Make CONFIG_SECURITY_FEATURE_BYPASS control all mte related. - Make SECURITY_FEATURE_BYPASS depends on ARM64_MTE and KASAN_HW_TAGS instead of FAST_SYSCALL or FAST_IRQ. v4: - "hisilicon" -> "turbo" --- arch/Kconfig | 65 ---------------------- arch/arm64/Kconfig | 4 +- arch/arm64/Kconfig.turbo | 77 ++++++++++++++++++++++++++ arch/arm64/configs/openeuler_defconfig | 14 +++-- arch/arm64/kernel/entry-common.c | 4 +- 5 files changed, 92 insertions(+), 72 deletions(-) create mode 100644 arch/arm64/Kconfig.turbo diff --git a/arch/Kconfig b/arch/Kconfig index a4ed5d338dad..93d8221cc834 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -1533,69 +1533,4 @@ config FUNCTION_ALIGNMENT default 4 if FUNCTION_ALIGNMENT_4B default 0 -config ARCH_SUPPORTS_FAST_SYSCALL - bool - -config FAST_SYSCALL - bool "Fast Syscall support" - depends on ARCH_SUPPORTS_FAST_SYSCALL - default n - help - This enable support Fast syscall feature. - The svc exception handling process, which includes auxiliary - functions for debug/trace and core functions like - KPTI, has been identified as overly "lengthy". - This inefficiency is particularly noticeable in short syscalls - such as lseek() and getpid(), where the syscall function itself - comprises a small percentage of the total instructions executed. - To address this, we introduce the concept of fast syscall, a fast svc - exception handling path that only considers necessary features - such as security, context saving, and recovery. - -config ARCH_SUPPORTS_FAST_IRQ - bool - -config FAST_IRQ - bool "Fast irq support" - depends on ARCH_SUPPORTS_FAST_IRQ - default n - help - The irq handling process, which includes auxiliary - functions for debug/trace and core functions like - KPTI, interrupt time record, interrupt processing as - a random number source, interrupt affinity - modification and interrupt processing race, as well as - spurious and unhandled interrupt debugging, has been - identified as overly "lengthy". - To address this, we introduce the concept of fast irq, - a fast interrupt handling path that only considers - necessary features such as security, context saving - and recovery, which adds an lightweight interrupt processing - framework for latency-sensitive interrupts. - -config DEBUG_FEATURE_BYPASS - bool "Bypass debug feature in fast syscall" - depends on FAST_SYSCALL || FAST_IRQ - depends on !LOCKDEP - default y - help - This to bypass debug feature in fast syscall. - The svc exception handling process, which includes auxiliary - functions for debug/trace and core functions like - KPTI, has been identified as overly "lengthy". - In fast syscall we only considers necessary features. - Disable this config to keep debug feature in fast syscall. - -config SECURITY_FEATURE_BYPASS - bool "Bypass security feature in fast syscall" - depends on FAST_SYSCALL || FAST_IRQ - default y - help - This to bypass security feature in fast syscall. - The svc exception handling process, which includes auxiliary - functions for debug/trace and core functions like - KPTI, has been identified as overly "lengthy". - In fast syscall we only considers necessary features. - Disable this config to keep security feature in fast syscall. - endmenu diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index dabbbb0e012c..29554be608e1 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -267,8 +267,6 @@ config ARM64 select TRACE_IRQFLAGS_SUPPORT select TRACE_IRQFLAGS_NMI_SUPPORT select HAVE_SOFTIRQ_ON_OWN_STACK - select ARCH_SUPPORTS_FAST_SYSCALL if !ARM64_MTE && !KASAN_HW_TAGS - select ARCH_SUPPORTS_FAST_IRQ if ARM_GIC_V3 && !ARM64_MTE && !KASAN_HW_TAGS help ARM 64-bit (AArch64) Linux support. @@ -427,6 +425,8 @@ source "kernel/livepatch/Kconfig" menu "Kernel Features" +source "arch/arm64/Kconfig.turbo" + menu "ARM errata workarounds via the alternatives framework" config AMPERE_ERRATUM_AC03_CPU_38 diff --git a/arch/arm64/Kconfig.turbo b/arch/arm64/Kconfig.turbo new file mode 100644 index 000000000000..586edb89609c --- /dev/null +++ b/arch/arm64/Kconfig.turbo @@ -0,0 +1,77 @@ +# SPDX-License-Identifier: GPL-2.0-only +menu "Turbo features selection" + +config FAST_SYSCALL + bool "Fast syscall handler support" + default n + select DEBUG_FEATURE_BYPASS + select SECURITY_FEATURE_BYPASS + help + This enable support Fast syscall feature. + The svc exception handling process, which includes auxiliary + functions for debug/trace and core functions like + KPTI, has been identified as overly "lengthy". + This inefficiency is particularly noticeable in short syscalls + such as lseek() and getpid(), where the syscall function itself + comprises a small percentage of the total instructions executed. + To address this, we introduce the concept of fast syscall, a fast svc + exception handling path that only considers necessary features + such as security, context saving, and recovery. + +config FAST_IRQ + bool "Fast irq handler support" + depends on ARM_GIC_V3 + default n + select DEBUG_FEATURE_BYPASS + select SECURITY_FEATURE_BYPASS + help + The irq handling process, which includes auxiliary + functions for debug/trace and core functions like + KPTI, interrupt time record, interrupt processing as + a random number source, interrupt affinity + modification and interrupt processing race, as well as + spurious and unhandled interrupt debugging, has been + identified as overly "lengthy". + To address this, we introduce the concept of fast irq, + a fast interrupt handling path that only considers + necessary features such as security, context saving + and recovery, which adds an lightweight interrupt processing + framework for latency-sensitive interrupts. + +config DEBUG_FEATURE_BYPASS + bool "Bypass debug feature in fast syscall" + depends on FAST_SYSCALL || FAST_IRQ + depends on !LOCKDEP + default n + help + This to bypass debug feature in fast syscall. + The svc exception handling process, which includes auxiliary + functions for debug/trace and core functions like + KPTI, has been identified as overly "lengthy". + In fast syscall we only considers necessary features. + Disable this config to keep debug feature in fast syscall. + +config SECURITY_FEATURE_BYPASS + bool "Bypass security feature in fast syscall" + depends on !ARM64_MTE + depends on !KASAN_HW_TAGS + depends on FAST_SYSCALL || FAST_IRQ + default n + help + This to bypass security feature in fast syscall. + The svc exception handling process, which includes auxiliary + functions for debug/trace and core functions like + KPTI, has been identified as overly "lengthy". + In fast syscall we only considers necessary features. + Disable this config to keep security feature in fast syscall. + +config ACTLR_XCALL_XINT + bool "Hardware XCALL and Xint support" + default n + help + Use the 0x600 as the offset to the exception vector base address for + 'svc ffff' + Use the 0x680 as the offset to the exception vector base address for + the Armv8.8 NMI taken from EL0. + +endmenu # "Turbo features selection" diff --git a/arch/arm64/configs/openeuler_defconfig b/arch/arm64/configs/openeuler_defconfig index 11500a2d3ba1..e800680c4530 100644 --- a/arch/arm64/configs/openeuler_defconfig +++ b/arch/arm64/configs/openeuler_defconfig @@ -378,6 +378,16 @@ CONFIG_LIVEPATCH_ISOLATE_KPROBE=y # Kernel Features # +# +# Turbo features selection +# +CONFIG_FAST_SYSCALL=y +CONFIG_FAST_IRQ=y +CONFIG_DEBUG_FEATURE_BYPASS=y +CONFIG_SECURITY_FEATURE_BYPASS=y +CONFIG_ACTLR_XCALL_XINT=y +# end of Turbo features selection + # # ARM errata workarounds via the alternatives framework # @@ -902,10 +912,6 @@ CONFIG_HAVE_GCC_PLUGINS=y CONFIG_FUNCTION_ALIGNMENT_4B=y CONFIG_FUNCTION_ALIGNMENT_8B=y CONFIG_FUNCTION_ALIGNMENT=8 -CONFIG_ARCH_SUPPORTS_FAST_SYSCALL=y -# CONFIG_FAST_SYSCALL is not set -CONFIG_ARCH_SUPPORTS_FAST_IRQ=y -# CONFIG_FAST_IRQ is not set # end of General architecture-dependent options CONFIG_RT_MUTEXES=y diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c index 4602c107c40a..b7cc01130ff5 100644 --- a/arch/arm64/kernel/entry-common.c +++ b/arch/arm64/kernel/entry-common.c @@ -186,7 +186,7 @@ static __always_inline void __fast_exit_to_user_mode(void) static __always_inline void fast_exit_to_user_mode(struct pt_regs *regs) { fast_exit_to_user_mode_prepare(regs); -#ifndef CONFIG_DEBUG_FEATURE_BYPASS +#ifndef CONFIG_SECURITY_FEATURE_BYPASS mte_check_tfsr_exit(); #endif __fast_exit_to_user_mode(); @@ -202,6 +202,8 @@ static __always_inline void fast_enter_from_user_mode(struct pt_regs *regs) user_exit_irqoff(); #ifndef CONFIG_DEBUG_FEATURE_BYPASS trace_hardirqs_off_finish(); +#endif +#ifndef CONFIG_SECURITY_FEATURE_BYPASS mte_disable_tco_entry(current); #endif } -- 2.34.1

Jinjie Ruan

9:10 a.m.

New subject: [PATCH OLK-6.6 v2 2/3] arm64: entry: Support hardware xcall and xint

hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/release-management/issues/IBV2E4 -------------------------------- Support hardware Xcall and Xint. Hardware xint provides a separate entry for interrupt handling, so we can use it to customize and respond to interrupts relatively quickly. Support hardware xcall. Hardware xcall provides a separate entry for el0 syscall handling, so we can use it to customize and respond to system call relatively quickly. Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> --- arch/arm64/include/asm/actlr.h | 15 ++++++ arch/arm64/include/asm/vectors.h | 1 + arch/arm64/kernel/cpufeature.c | 81 ++++++++++++++++++++++++++++++++ arch/arm64/kernel/entry-common.c | 15 +++++- arch/arm64/kernel/entry.S | 52 +++++++++++++++++++- arch/arm64/tools/cpucaps | 2 +- 6 files changed, 161 insertions(+), 5 deletions(-) create mode 100644 arch/arm64/include/asm/actlr.h diff --git a/arch/arm64/include/asm/actlr.h b/arch/arm64/include/asm/actlr.h new file mode 100644 index 000000000000..3a44b6876e81 --- /dev/null +++ b/arch/arm64/include/asm/actlr.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2025 - Huawei Ltd. + */ + +#ifndef __ASM_ACTLR_H +#define __ASM_ACTLR_H + +#define ACTLR_ELx_XCALL_SHIFT 20 +#define ACTLR_ELx_XCALL (UL(1) << ACTLR_ELx_XCALL_SHIFT) + +#define ACTLR_ELx_XINT_SHIFT (21) +#define ACTLR_ELx_XINT (UL(1) << ACTLR_ELx_XINT_SHIFT) + +#endif /* __ASM_ACTLR_H */ diff --git a/arch/arm64/include/asm/vectors.h b/arch/arm64/include/asm/vectors.h index bc9a2145f419..0addb4bd2b3d 100644 --- a/arch/arm64/include/asm/vectors.h +++ b/arch/arm64/include/asm/vectors.h @@ -11,6 +11,7 @@ #include <asm/fixmap.h> extern char vectors[]; +extern char vectors_xcall_xint[]; extern char tramp_vectors[]; extern char __bp_harden_el1_vectors[]; diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 5c3d206785bd..b13858668877 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -76,6 +76,7 @@ #include <linux/kasan.h> #include <linux/percpu.h> +#include <asm/actlr.h> #include <asm/cpu.h> #include <asm/cpufeature.h> #include <asm/cpu_ops.h> @@ -2466,6 +2467,77 @@ static bool has_xint_support(const struct arm64_cpu_capabilities *entry, int __u } #endif +#ifdef CONFIG_ACTLR_XCALL_XINT +static bool has_arch_xcall_xint_support(const struct arm64_cpu_capabilities *entry, int scope) +{ + /* List of CPUs that support Xcall/Xint */ + static const struct midr_range xcall_xint_cpus[] = { + MIDR_ALL_VERSIONS(MIDR_HISI_HIP12), + { /* sentinel */ } + }; + + return is_midr_in_range_list(read_cpuid_id(), xcall_xint_cpus); +} + +static void enable_xcall_xint_vectors(void) +{ + /* + * Upon CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY is enabled, + * the vbar_el1 is set to the vectors starts from __bp_harden_el1_vectors. + * Kernel will jump to the xcall/xint vectors from the trampoline vector + * defined in the macro tramp_ventry. + */ + if (__this_cpu_read(this_cpu_vector) != vectors) + return; + + /* + * Upon KAISER is enabled, the vbar_el1 is set to the vectors starts + * from tramp_vectors. Kernel will jump to the vectors_xcall_xint from + * the trampoline vector defined in the macro tramp_ventry. + */ + if (arm64_kernel_unmapped_at_el0()) + return; + + /* + * If neither KAISER or BHB_MITIGATION is enabled, then we switch + * the vbar_el1 from the default vectors to the xcall/xint vectors + * at once. + */ + write_sysreg(vectors_xcall_xint, vbar_el1); + isb(); +} + +static void cpu_enable_arch_xcall_xint(const struct arm64_cpu_capabilities *__unused) +{ + int cpu = smp_processor_id(); + u64 actlr_el1, actlr_el2; + u64 el; + + el = read_sysreg(CurrentEL); + if (el == CurrentEL_EL2) { + /* + * Enable EL2 trap when access ACTLR_EL1 in guest kernel. + */ + write_sysreg_s(read_sysreg_s(SYS_HCR_EL2) | HCR_TACR, SYS_HCR_EL2); + actlr_el2 = read_sysreg(actlr_el2); + actlr_el2 |= (ACTLR_ELx_XINT | ACTLR_ELx_XCALL); + write_sysreg(actlr_el2, actlr_el2); + isb(); + actlr_el2 = read_sysreg(actlr_el2); + pr_info("actlr_el2: %llx, cpu:%d\n", actlr_el2, cpu); + } else { + actlr_el1 = read_sysreg(actlr_el1); + actlr_el1 |= (ACTLR_ELx_XINT | ACTLR_ELx_XCALL); + write_sysreg(actlr_el1, actlr_el1); + isb(); + actlr_el1 = read_sysreg(actlr_el1); + pr_info("actlr_el1: %llx, cpu:%d\n", actlr_el1, cpu); + } + + enable_xcall_xint_vectors(); +} +#endif + static const struct arm64_cpu_capabilities arm64_features[] = { { .capability = ARM64_ALWAYS_BOOT, @@ -3031,6 +3103,15 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .cpu_enable = cpu_enable_ls64_v, ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, LS64, LS64_V) }, +#endif +#ifdef CONFIG_ACTLR_XCALL_XINT + { + .desc = "Hardware Xcall and Xint Support", + .capability = ARM64_HAS_HW_XCALL_XINT, + .type = ARM64_CPUCAP_SYSTEM_FEATURE, + .matches = has_arch_xcall_xint_support, + .cpu_enable = cpu_enable_arch_xcall_xint, + }, #endif {}, }; diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c index b7cc01130ff5..a90231346751 100644 --- a/arch/arm64/kernel/entry-common.c +++ b/arch/arm64/kernel/entry-common.c @@ -609,7 +609,7 @@ static void noinstr el0_xint(struct pt_regs *regs, u64 nmi_flag, } -asmlinkage void noinstr el0t_64_xint_handler(struct pt_regs *regs) +asmlinkage void noinstr el0t_64_fast_irq_handler(struct pt_regs *regs) { el0_xint(regs, ISR_EL1_IS, handle_arch_irq, handle_arch_nmi_irq); } @@ -831,7 +831,7 @@ static void noinstr el0_xcall(struct pt_regs *regs) fast_exit_to_user_mode(regs); } -asmlinkage void noinstr el0t_64_xcall_handler(struct pt_regs *regs) +asmlinkage void noinstr el0t_64_fast_syscall_handler(struct pt_regs *regs) { el0_xcall(regs); } @@ -1051,6 +1051,17 @@ UNHANDLED(el0t, 32, fiq) UNHANDLED(el0t, 32, error) #endif /* CONFIG_AARCH32_EL0 */ +#ifdef CONFIG_ACTLR_XCALL_XINT +asmlinkage void noinstr el0t_64_xcall_handler(struct pt_regs *regs) +{ + el0_svc(regs); +} +asmlinkage void noinstr el0t_64_xint_handler(struct pt_regs *regs) +{ + el0_interrupt(regs, ISR_EL1_IS, handle_arch_irq, handle_arch_nmi_irq); +} +#endif + #ifdef CONFIG_VMAP_STACK asmlinkage void noinstr __noreturn handle_bad_stack(struct pt_regs *regs) { diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index da3809632f0f..801a521613ad 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -48,7 +48,13 @@ mrs x30, tpidrro_el0 msr tpidrro_el0, xzr .else + alternative_if ARM64_HAS_HW_XCALL_XINT + mrs x30, tpidrro_el0 + msr tpidrro_el0, xzr + alternative_else mov x30, xzr + nop + alternative_endif .endif .Lskip_tramp_vectors_cleanup\@: .endif @@ -570,6 +576,29 @@ SYM_CODE_START(vectors) kernel_ventry 0, t, 32, error // Error 32-bit EL0 SYM_CODE_END(vectors) + .align 11 +SYM_CODE_START(vectors_xcall_xint) + kernel_ventry 1, t, 64, sync // Synchronous EL1t + kernel_ventry 1, t, 64, irq // IRQ EL1t + kernel_ventry 1, t, 64, fiq // FIQ EL1t + kernel_ventry 1, t, 64, error // Error EL1t + + kernel_ventry 1, h, 64, sync // Synchronous EL1h + kernel_ventry 1, h, 64, irq // IRQ EL1h + kernel_ventry 1, h, 64, fiq // FIQ EL1h + kernel_ventry 1, h, 64, error // Error EL1h + + kernel_ventry 0, t, 64, sync // Synchronous 64-bit EL0 + kernel_ventry 0, t, 64, irq // IRQ 64-bit EL0 + kernel_ventry 0, t, 64, fiq // FIQ 64-bit EL0 + kernel_ventry 0, t, 64, error // Error 64-bit EL0 + + kernel_ventry 0, t, 64, xcall // XCALL synchronous 64-bit EL0 + kernel_ventry 0, t, 64, xint // XINT 64-bit EL0 + kernel_ventry 0, t, 32, fiq // FIQ 32-bit EL0 + kernel_ventry 0, t, 32, error // Error 32-bit EL0 +SYM_CODE_END(vectors_xcall_xint) + #ifdef CONFIG_VMAP_STACK SYM_CODE_START_LOCAL(__bad_stack) /* @@ -648,7 +677,7 @@ SYM_CODE_END(__bad_stack) kernel_entry 0, 64 #endif mov x0, sp - bl el0t_64_xcall_handler + bl el0t_64_fast_syscall_handler #ifdef CONFIG_SECURITY_FEATURE_BYPASS kernel_exit 0, xcall #else @@ -696,7 +725,7 @@ SYM_CODE_END(__bad_stack) kernel_entry 0, 64 #endif mov x0, sp - bl el0t_64_xint_handler + bl el0t_64_fast_irq_handler #ifdef CONFIG_SECURITY_FEATURE_BYPASS kernel_exit 0, xint #else @@ -759,6 +788,10 @@ SYM_CODE_END(el\el\ht\()_\regsize\()_\label) entry_handler 0, t, 64, fiq entry_handler 0, t, 64, error +#ifdef CONFIG_ACTLR_XCALL_XINT + entry_handler 0, t, 64, xcall + entry_handler 0, t, 64, xint +#endif entry_handler 0, t, 32, sync entry_handler 0, t, 32, irq entry_handler 0, t, 32, fiq @@ -849,6 +882,12 @@ alternative_else_nop_endif msr tpidrro_el0, x30 // Restored in kernel_ventry .endif + .if \regsize == 32 + alternative_if ARM64_HAS_HW_XCALL_XINT + msr tpidrro_el0, x30 // Restored in kernel_ventry + alternative_else_nop_endif + .endif + .if \bhb == BHB_MITIGATION_LOOP /* * This sequence must appear before the first indirect branch. i.e. the @@ -873,7 +912,12 @@ alternative_else_nop_endif 2: tramp_map_kernel x30 alternative_insn isb, nop, ARM64_WORKAROUND_QCOM_FALKOR_E1003 +alternative_if_not ARM64_HAS_HW_XCALL_XINT tramp_data_read_var x30, vectors + b 3f +alternative_else_nop_endif + tramp_data_read_var x30, vectors_xcall_xint +3: alternative_if_not ARM64_WORKAROUND_CAVIUM_TX2_219_PRFM prfm plil1strm, [x30, #(1b - \vector_start)] alternative_else_nop_endif @@ -881,7 +925,11 @@ alternative_else_nop_endif msr vbar_el1, x30 isb .else +alternative_if_not ARM64_HAS_HW_XCALL_XINT adr_l x30, vectors +alternative_else + adr_l x30, vectors_xcall_xint +alternative_endif .endif // \kpti == 1 .if \bhb == BHB_MITIGATION_FW diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps index 27d93050e5da..ae0268822d61 100644 --- a/arch/arm64/tools/cpucaps +++ b/arch/arm64/tools/cpucaps @@ -112,7 +112,7 @@ HAS_XCALL HAS_XINT HAS_LS64 HAS_LS64_V -KABI_RESERVE_5 +HAS_HW_XCALL_XINT KABI_RESERVE_6 KABI_RESERVE_7 KABI_RESERVE_8 -- 2.34.1

Jinjie Ruan

9:10 a.m.

New subject: [PATCH OLK-6.6 v2 3/3] arm64: idle: Handle idle state for xcall/xint

hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/release-management/issues/IBV2E4 -------------------------------- When enter idle state, the actlr register will reset to an architecturally UNKNOWN value on warm reset. So save and restore actlr_el1 and actlr_el2 register value when enter and exit idle state. Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> --- arch/arm64/include/asm/cpufeature.h | 8 ++++++++ arch/arm64/include/asm/cpuidle.h | 32 +++++++++++++++++++++++++++++ arch/arm64/kernel/idle.c | 31 ++++++++++++++++++++++++++++ 3 files changed, 71 insertions(+) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index dd758b04fd54..88cdf27fe701 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -831,6 +831,14 @@ static inline bool system_has_full_ptr_auth(void) return system_supports_address_auth() && system_supports_generic_auth(); } +#ifdef CONFIG_ACTLR_XCALL_XINT +static __always_inline bool system_uses_xcall_xint(void) +{ + return IS_ENABLED(CONFIG_ACTLR_XCALL_XINT) && + cpus_have_const_cap(ARM64_HAS_HW_XCALL_XINT); +} +#endif + static __always_inline bool system_uses_irq_prio_masking(void) { return IS_ENABLED(CONFIG_ARM64_PSEUDO_NMI) && diff --git a/arch/arm64/include/asm/cpuidle.h b/arch/arm64/include/asm/cpuidle.h index 2047713e097d..ae2c108880dd 100644 --- a/arch/arm64/include/asm/cpuidle.h +++ b/arch/arm64/include/asm/cpuidle.h @@ -38,4 +38,36 @@ struct arm_cpuidle_irq_context { }; #define arm_cpuidle_save_irq_context(c) (void)c #define arm_cpuidle_restore_irq_context(c) (void)c #endif + +#ifdef CONFIG_ACTLR_XCALL_XINT +struct arm_cpuidle_xcall_xint_context { + unsigned long actlr_el1; + unsigned long actlr_el2; +}; + +#define arm_cpuidle_save_xcall_xint_context(__c) \ + do { \ + struct arm_cpuidle_xcall_xint_context *c = __c; \ + if (system_uses_xcall_xint()) { \ + c->actlr_el1 = read_sysreg(actlr_el1); \ + if (read_sysreg(CurrentEL) == CurrentEL_EL2) \ + c->actlr_el2 = read_sysreg(actlr_el2); \ + } \ + } while (0) + +#define arm_cpuidle_restore_xcall_xint_context(__c) \ + do { \ + struct arm_cpuidle_xcall_xint_context *c = __c; \ + if (system_uses_xcall_xint()) { \ + write_sysreg(c->actlr_el1, actlr_el1); \ + if (read_sysreg(CurrentEL) == CurrentEL_EL2) \ + write_sysreg(c->actlr_el2, actlr_el2); \ + } \ + } while (0) +#else +struct arm_cpuidle_xcall_xint_context { }; + +#define arm_cpuidle_save_xcall_xint_context(c) (void)c +#define arm_cpuidle_restore_xcall_xint_context(c) (void)c +#endif #endif diff --git a/arch/arm64/kernel/idle.c b/arch/arm64/kernel/idle.c index 3a0b59aa12e2..6876392948b3 100644 --- a/arch/arm64/kernel/idle.c +++ b/arch/arm64/kernel/idle.c @@ -44,3 +44,34 @@ void noinstr arch_cpu_idle(void) cpu_do_idle(); } EXPORT_SYMBOL_GPL(arch_cpu_idle); + +#ifdef CONFIG_ACTLR_XCALL_XINT +DEFINE_PER_CPU_ALIGNED(struct arm_cpuidle_xcall_xint_context, contexts); + +void arch_cpu_idle_enter(void) +{ + struct arm_cpuidle_xcall_xint_context *context; + + if (!system_uses_xcall_xint()) + return; + + context = &get_cpu_var(contexts); + arm_cpuidle_save_xcall_xint_context(context); + put_cpu_var(contexts); +} + +void arch_cpu_idle_exit(void) +{ + struct arm_cpuidle_xcall_xint_context *context; + + if (!system_uses_xcall_xint()) + return; + + context = &get_cpu_var(contexts); + arm_cpuidle_restore_xcall_xint_context(context); + put_cpu_var(contexts); +} +#else +void arch_cpu_idle_enter(void) {} +void arch_cpu_idle_exit(void) {} +#endif -- 2.34.1

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9:15 a.m.

反馈：您发送到kernel@openeuler.org的补丁/补丁集，已成功转换为PR！ PR链接地址： https://gitee.com/openeuler/kernel/pulls/16455 邮件列表地址：https://mailweb.openeuler.org/archives/list/kernel@openeuler.org/message/6DR... FeedBack: The patch(es) which you have sent to kernel@openeuler.org mailing list has been converted to a pull request successfully! Pull request link: https://gitee.com/openeuler/kernel/pulls/16455 Mailing list address: https://mailweb.openeuler.org/archives/list/kernel@openeuler.org/message/6DR...

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Jinjie Ruan
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