From: Borislav Petkov <[email protected]> Add a helper which writes the same MSR value on a set of CPUs.
Signed-off-by: Borislav Petkov <[email protected]> --- arch/x86/include/asm/msr.h | 8 ++++++++ arch/x86/lib/msr-smp.c | 15 +++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h index 86f20d520a07..71393a4c2104 100644 --- a/arch/x86/include/asm/msr.h +++ b/arch/x86/include/asm/msr.h @@ -342,6 +342,7 @@ int rdmsrl_on_cpu(unsigned int cpu, u32 msr_no, u64 *q); int wrmsrl_on_cpu(unsigned int cpu, u32 msr_no, u64 q); void rdmsr_on_cpus(const struct cpumask *mask, u32 msr_no, struct msr *msrs); void wrmsr_on_cpus(const struct cpumask *mask, u32 msr_no, struct msr *msrs); +void wrmsrl_val_on_cpus(const struct cpumask *mask, u32 msr_no, u64 reg_val); int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h); int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h); int rdmsrl_safe_on_cpu(unsigned int cpu, u32 msr_no, u64 *q); @@ -379,6 +380,13 @@ static inline void wrmsr_on_cpus(const struct cpumask *m, u32 msr_no, { wrmsr_on_cpu(0, msr_no, msrs[0].l, msrs[0].h); } + +static inline void wrmsrl_val_on_cpus(const struct cpumask *mask, u32 msr_no, + u64 reg_val) +{ + wrmsrl(msr_no, reg_val); +} + static inline int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h) { diff --git a/arch/x86/lib/msr-smp.c b/arch/x86/lib/msr-smp.c index 15e1157d6b29..f67ee2fdec69 100644 --- a/arch/x86/lib/msr-smp.c +++ b/arch/x86/lib/msr-smp.c @@ -149,6 +149,21 @@ void wrmsr_on_cpus(const struct cpumask *mask, u32 msr_no, struct msr *msrs) } EXPORT_SYMBOL(wrmsr_on_cpus); +/* + * wrmsr a single MSR value on a bunch of CPUs. To be used for MSRs which are + * the same on each core. + * + * @mask: which CPUs + * @msr_no: which MSR + * @reg_val: MSR value + * + */ +void wrmsrl_val_on_cpus(const struct cpumask *mask, u32 msr_no, u64 reg_val) +{ + __rwmsr_on_cpus(mask, msr_no, NULL, reg_val, __wrmsr_on_cpu); +} +EXPORT_SYMBOL(wrmsrl_val_on_cpus); + struct msr_info_completion { struct msr_info msr; struct completion done; -- 2.21.0
