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x86, msr: execute on the correct CPU subset

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Make rdmsr_on_cpus/wrmsr_on_cpus execute on the current CPU only if it
is in the supplied bitmask.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Borislav Petkov 2009-07-30 11:10:01 +02:00 committed by H. Peter Anvin
parent d2ba8b211b
commit bab9a3da93
1 changed files with 10 additions and 16 deletions
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26
arch/x86/lib/msr.c
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@ -89,16 +89,13 @@ void rdmsr_on_cpus(const cpumask_t *mask, u32 msr_no, struct msr *msrs)
rv.msrs = msrs;
rv.msr_no = msr_no;
preempt_disable();
/*
* FIXME: handle the CPU we're executing on separately for now until
* smp_call_function_many has been fixed to not skip it.
*/
this_cpu = raw_smp_processor_id();
smp_call_function_single(this_cpu, __rdmsr_on_cpu, &rv, 1);
this_cpu = get_cpu();
if (cpumask_test_cpu(this_cpu, mask))
__rdmsr_on_cpu(&rv);
smp_call_function_many(mask, __rdmsr_on_cpu, &rv, 1);
preempt_enable();
put_cpu();
}
EXPORT_SYMBOL(rdmsr_on_cpus);
@ -121,16 +118,13 @@ void wrmsr_on_cpus(const cpumask_t *mask, u32 msr_no, struct msr *msrs)
rv.msrs = msrs;
rv.msr_no = msr_no;
preempt_disable();
/*
* FIXME: handle the CPU we're executing on separately for now until
* smp_call_function_many has been fixed to not skip it.
*/
this_cpu = raw_smp_processor_id();
smp_call_function_single(this_cpu, __wrmsr_on_cpu, &rv, 1);
this_cpu = get_cpu();
if (cpumask_test_cpu(this_cpu, mask))
__wrmsr_on_cpu(&rv);
smp_call_function_many(mask, __wrmsr_on_cpu, &rv, 1);
preempt_enable();
put_cpu();
}
EXPORT_SYMBOL(wrmsr_on_cpus);