diff options
| author | Wanpeng Li <wanpeng.li@hotmail.com> | 2016-11-07 06:13:39 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-11-10 00:03:14 +0300 |
| commit | b2c5ea4f759190ee9f75687a00035c1a66d0d743 (patch) | |
| tree | 330b4c080ae19d1fd6578429d5d5fec64b875340 /arch/x86/include/asm | |
| parent | d2d9c4a3d01c20f936f88e0c2793945e6632dab6 (diff) | |
| download | linux-b2c5ea4f759190ee9f75687a00035c1a66d0d743.tar.xz | |
x86/msr: Add wrmsr_notrace()
Required to remove the extra irq_enter()/irq_exit() in
smp_reschedule_interrupt().
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: kvm@vger.kernel.org
Cc: Mike Galbraith <efault@gmx.de>
Link: http://lkml.kernel.org/r/1478488420-5982-2-git-send-email-wanpeng.li@hotmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/msr.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h index b5fee97813cd..9b0a23236836 100644 --- a/arch/x86/include/asm/msr.h +++ b/arch/x86/include/asm/msr.h @@ -115,17 +115,29 @@ static inline unsigned long long native_read_msr_safe(unsigned int msr, } /* Can be uninlined because referenced by paravirt */ -notrace static inline void native_write_msr(unsigned int msr, +static notrace inline void __native_write_msr_notrace(unsigned int msr, unsigned low, unsigned high) { asm volatile("1: wrmsr\n" "2:\n" _ASM_EXTABLE_HANDLE(1b, 2b, ex_handler_wrmsr_unsafe) : : "c" (msr), "a"(low), "d" (high) : "memory"); +} + +/* Can be uninlined because referenced by paravirt */ +static notrace inline void native_write_msr(unsigned int msr, + unsigned low, unsigned high) +{ + __native_write_msr_notrace(msr, low, high); if (msr_tracepoint_active(__tracepoint_write_msr)) do_trace_write_msr(msr, ((u64)high << 32 | low), 0); } +static inline void wrmsr_notrace(unsigned msr, unsigned low, unsigned high) +{ + __native_write_msr_notrace(msr, low, high); +} + /* Can be uninlined because referenced by paravirt */ notrace static inline int native_write_msr_safe(unsigned int msr, unsigned low, unsigned high) |