Commit 1de87bd4 authored by Andi Kleen's avatar Andi Kleen Committed by Ingo Molnar
Browse files

x86: re-add rdmsrl_safe 



RDMSR for 64bit values with exception handling.

Makes it easier to deal with 64bit valued MSRs. The old 64bit code
base had that too as checking_rdmsrl(), but it got dropped somehow.

Signed-off-by: default avatarAndi Kleen <andi@firstfloor.org>
Cc: andreas.herrmann3@amd.com
Cc: mingo@elte.hu
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent f5c24a7f

include/asm-x86/msr.h

+8 −0
Original line number Diff line number Diff line
@@ -150,6 +150,14 @@ static inline int wrmsr_safe(unsigned msr, unsigned low, unsigned high) 
	__err;							\

})



static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)

{

	int err;



	*p = native_read_msr_safe(msr, &err);

	return err;

}



#define rdtscl(low)						\

	((low) = (u32)native_read_tsc())

include/asm-x86/paravirt.h

+7 −0
Original line number Diff line number Diff line
@@ -693,6 +693,13 @@ do { \ 
	_err;					\

})



static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)

{

	int err;



	*p = paravirt_read_msr(msr, &err);

	return err;

}



static inline u64 paravirt_read_tsc(void)

{