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x86, msr: Create _on_cpu helpers for {rw,wr}msr_safe_regs()

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Create _on_cpu helpers for {rw,wr}msr_safe_regs() analogously with the
other MSR functions.  This will be necessary to add support for these
to the MSR driver.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Borislav Petkov <petkovbb@gmail.com>
This commit is contained in:
H. Peter Anvin
2009-08-31 14:13:48 -07:00
parent 0cc0213e73
commit 8b956bf1f0
2 changed files with 63 additions and 4 deletions
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49
arch/x86/lib/msr.c
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@@ -175,3 +175,52 @@ int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
return err ? err : rv.err;
}
EXPORT_SYMBOL(wrmsr_safe_on_cpu);
/*
* These variants are significantly slower, but allows control over
* the entire 32-bit GPR set.
*/
struct msr_regs_info {
u32 *regs;
int err;
};
static void __rdmsr_safe_regs_on_cpu(void *info)
{
struct msr_regs_info *rv = info;
rv->err = rdmsr_safe_regs(rv->regs);
}
static void __wrmsr_safe_regs_on_cpu(void *info)
{
struct msr_regs_info *rv = info;
rv->err = wrmsr_safe_regs(rv->regs);
}
int rdmsr_safe_regs_on_cpu(unsigned int cpu, u32 *regs)
{
int err;
struct msr_regs_info rv;
rv.regs = regs;
rv.err = -EIO;
err = smp_call_function_single(cpu, __rdmsr_safe_regs_on_cpu, &rv, 1);
return err ? err : rv.err;
}
EXPORT_SYMBOL(rdmsr_safe_regs_on_cpu);
int wrmsr_safe_regs_on_cpu(unsigned int cpu, u32 *regs)
{
int err;
struct msr_regs_info rv;
rv.regs = regs;
rv.err = -EIO;
err = smp_call_function_single(cpu, __wrmsr_safe_regs_on_cpu, &rv, 1);
return err ? err : rv.err;
}
EXPORT_SYMBOL(wrmsr_safe_regs_on_cpu);