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x86/msr: Add wrmsr_notrace()

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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>
This commit is contained in:
Wanpeng Li 2016-11-07 11:13:39 +08:00 committed by Thomas Gleixner
parent d2d9c4a3d0
commit b2c5ea4f75
1 changed files with 13 additions and 1 deletions
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14
arch/x86/include/asm/msr.h
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@ -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)