diff options
Diffstat (limited to 'arch/x86/include/asm/fred.h')
| -rw-r--r-- | arch/x86/include/asm/fred.h | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/arch/x86/include/asm/fred.h b/arch/x86/include/asm/fred.h index e86c7ba32435..25ca00bd70e8 100644 --- a/arch/x86/include/asm/fred.h +++ b/arch/x86/include/asm/fred.h @@ -36,6 +36,7 @@ #ifdef CONFIG_X86_FRED #include <linux/kernel.h> +#include <linux/sched/task_stack.h> #include <asm/ptrace.h> @@ -84,13 +85,33 @@ static __always_inline void fred_entry_from_kvm(unsigned int type, unsigned int } void cpu_init_fred_exceptions(void); +void cpu_init_fred_rsps(void); void fred_complete_exception_setup(void); +DECLARE_PER_CPU(unsigned long, fred_rsp0); + +static __always_inline void fred_sync_rsp0(unsigned long rsp0) +{ + __this_cpu_write(fred_rsp0, rsp0); +} + +static __always_inline void fred_update_rsp0(void) +{ + unsigned long rsp0 = (unsigned long) task_stack_page(current) + THREAD_SIZE; + + if (cpu_feature_enabled(X86_FEATURE_FRED) && (__this_cpu_read(fred_rsp0) != rsp0)) { + wrmsrns(MSR_IA32_FRED_RSP0, rsp0); + __this_cpu_write(fred_rsp0, rsp0); + } +} #else /* CONFIG_X86_FRED */ static __always_inline unsigned long fred_event_data(struct pt_regs *regs) { return 0; } static inline void cpu_init_fred_exceptions(void) { } +static inline void cpu_init_fred_rsps(void) { } static inline void fred_complete_exception_setup(void) { } -static __always_inline void fred_entry_from_kvm(unsigned int type, unsigned int vector) { } +static inline void fred_entry_from_kvm(unsigned int type, unsigned int vector) { } +static inline void fred_sync_rsp0(unsigned long rsp0) { } +static inline void fred_update_rsp0(void) { } #endif /* CONFIG_X86_FRED */ #endif /* !__ASSEMBLY__ */ |