diff options
Diffstat (limited to 'arch/x86/include/asm/switch_to.h')
| -rw-r--r-- | arch/x86/include/asm/switch_to.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/x86/include/asm/switch_to.h b/arch/x86/include/asm/switch_to.h index f42dbf17f52b..499b1c15cc8b 100644 --- a/arch/x86/include/asm/switch_to.h +++ b/arch/x86/include/asm/switch_to.h @@ -52,6 +52,8 @@ do { \ } while (0) #ifdef CONFIG_X86_32 +#include <asm/msr.h> + static inline void refresh_sysenter_cs(struct thread_struct *thread) { /* Only happens when SEP is enabled, no need to test "SEP"arately: */ @@ -59,7 +61,7 @@ static inline void refresh_sysenter_cs(struct thread_struct *thread) return; this_cpu_write(cpu_tss_rw.x86_tss.ss1, thread->sysenter_cs); - wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0); + wrmsrq(MSR_IA32_SYSENTER_CS, thread->sysenter_cs); } #endif @@ -70,8 +72,8 @@ static inline void update_task_stack(struct task_struct *task) #ifdef CONFIG_X86_32 this_cpu_write(cpu_tss_rw.x86_tss.sp1, task->thread.sp0); #else - /* Xen PV enters the kernel on the thread stack. */ - if (cpu_feature_enabled(X86_FEATURE_XENPV)) + if (!cpu_feature_enabled(X86_FEATURE_FRED) && cpu_feature_enabled(X86_FEATURE_XENPV)) + /* Xen PV enters the kernel on the thread stack. */ load_sp0(task_top_of_stack(task)); #endif } |