[PATCH] Readd rdmsrl_safe v2
- From: Andi Kleen <andi@xxxxxxxxxxxxxx>
- Date: Sat, 22 Mar 2008 10:59:28 +0100
Readd rdmsrl_safe v2
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.
v2: switch to inline
Signed-off-by: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andi Kleen <andi@xxxxxxxxxxxxxx>
---
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 +150,13 @@ static inline int wrmsr_safe(unsigned ms
__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())
Index: linux/include/asm-x86/paravirt.h
===================================================================
--- linux.orig/include/asm-x86/paravirt.h
+++ linux/include/asm-x86/paravirt.h
@@ -687,6 +687,12 @@ static inline int paravirt_write_msr(uns
(*b) = _l >> 32; \
_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)
{
--
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- References:
- [PATCH] [1/7] Implement true end_pfn_mapped for 32bit
- From: Andi Kleen
- [PATCH] [5/7] Readd rdmsrl_safe
- From: Andi Kleen
- Re: [PATCH] [5/7] Readd rdmsrl_safe
- From: Thomas Gleixner
- [PATCH] [1/7] Implement true end_pfn_mapped for 32bit
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