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Subject[PATCH] Readd rdmsrl_safe v2
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@suse.de>
Signed-off-by: Andi Kleen <andi@firstfloor.org>

---
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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