diff options
Diffstat (limited to 'arch/x86/kernel/process.c')
| -rw-r--r-- | arch/x86/kernel/process.c | 33 |
1 files changed, 27 insertions, 6 deletions
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index b8441147eb5e..962c3ce39323 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -30,6 +30,7 @@ #include <linux/hw_breakpoint.h> #include <linux/entry-common.h> #include <asm/cpu.h> +#include <asm/cpuid.h> #include <asm/apic.h> #include <linux/uaccess.h> #include <asm/mwait.h> @@ -92,7 +93,12 @@ EXPORT_PER_CPU_SYMBOL_GPL(__tss_limit_invalid); */ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) { - memcpy(dst, src, arch_task_struct_size); + /* init_task is not dynamically sized (incomplete FPU state) */ + if (unlikely(src == &init_task)) + memcpy_and_pad(dst, arch_task_struct_size, src, sizeof(init_task), 0); + else + memcpy(dst, src, arch_task_struct_size); + #ifdef CONFIG_VM86 dst->thread.vm86 = NULL; #endif @@ -825,7 +831,7 @@ void __noreturn stop_this_cpu(void *dummy) * X86_FEATURE_SME due to cmdline options. */ if (c->extended_cpuid_level >= 0x8000001f && (cpuid_eax(0x8000001f) & BIT(0))) - native_wbinvd(); + wbinvd(); /* * This brings a cache line back and dirties it, but @@ -835,11 +841,18 @@ void __noreturn stop_this_cpu(void *dummy) */ cpumask_clear_cpu(cpu, &cpus_stop_mask); +#ifdef CONFIG_SMP + if (smp_ops.stop_this_cpu) { + smp_ops.stop_this_cpu(); + BUG(); + } +#endif + for (;;) { /* * Use native_halt() so that memory contents don't change * (stack usage and variables) after possibly issuing the - * native_wbinvd() above. + * wbinvd() above. */ native_halt(); } @@ -870,7 +883,7 @@ static __init bool prefer_mwait_c1_over_halt(void) if (boot_cpu_has_bug(X86_BUG_MONITOR) || boot_cpu_has_bug(X86_BUG_AMD_APIC_C1E)) return false; - cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &edx); + cpuid(CPUID_LEAF_MWAIT, &eax, &ebx, &ecx, &edx); /* * If MWAIT extensions are not available, it is safe to use MWAIT @@ -926,7 +939,7 @@ void __init select_idle_routine(void) static_call_update(x86_idle, mwait_idle); } else if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) { pr_info("using TDX aware idle routine\n"); - static_call_update(x86_idle, tdx_safe_halt); + static_call_update(x86_idle, tdx_halt); } else { static_call_update(x86_idle, default_idle); } @@ -1035,7 +1048,7 @@ unsigned long __get_wchan(struct task_struct *p) return addr; } -long do_arch_prctl_common(int option, unsigned long arg2) +SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, arg2) { switch (option) { case ARCH_GET_CPUID: @@ -1050,5 +1063,13 @@ long do_arch_prctl_common(int option, unsigned long arg2) return fpu_xstate_prctl(option, arg2); } + if (!in_ia32_syscall()) + return do_arch_prctl_64(current, option, arg2); + return -EINVAL; } + +SYSCALL_DEFINE0(ni_syscall) +{ + return -ENOSYS; +} |