Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH] [5/7] Readd rdmsrl_safe | Date | Wed, 12 Mar 2008 03:53:31 +0100 (CET) |
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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.
Needed for followup patch.
Signed-off-by: Andi Kleen <ak@suse.de>
--- include/asm-x86/msr.h | 3 +++ include/asm-x86/paravirt.h | 4 ++++ 2 files changed, 7 insertions(+)
Index: linux/include/asm-x86/msr.h =================================================================== --- linux.orig/include/asm-x86/msr.h +++ linux/include/asm-x86/msr.h @@ -150,6 +150,9 @@ static inline int wrmsr_safe(unsigned ms __err; \ }) +#define rdmsrl_safe(msr,p) \ + ({ int __err; *(p) = native_read_msr_safe(msr, &__err); __err; }) + #define rdtscl(low) \ ((low) = (u32)native_read_tsc()) Index: linux/include/asm-x86/paravirt.h =================================================================== --- linux.orig/include/asm-x86/paravirt.h +++ linux/include/asm-x86/paravirt.h @@ -687,6 +687,10 @@ static inline int paravirt_write_msr(uns (*b) = _l >> 32; \ _err; }) +#define rdmsrl_safe(msr, p) ({ \ + int _err; \ + *(p) = paravirt_read_msr(msr, &_err); \ + _err; }) static inline u64 paravirt_read_tsc(void) {
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