On Fri, Jul 17, 2020 at 12:20:43AM -0700, [email protected] wrote:
> +/*
> + * Write the PKey Register Supervisor. This must be run with preemption
> + * disabled as it does not guarantee the atomicity of updating the pkrs_cache
> + * and MSR on its own.
> + */
> +void write_pkrs(u32 pkrs_val)
> +{
> + this_cpu_write(pkrs_cache, pkrs_val);
> + wrmsrl(MSR_IA32_PKRS, pkrs_val);
> +}
Should we write that like:
void write_pkrs(u32 pkr)
{
u32 *pkrs = get_cpu_ptr(pkrs_cache);
if (*pkrs != pkr) {
*pkrs = pkr;
wrmsrl(MSR_IA32_PKRS, pkr);
}
put_cpu_ptrpkrs_cache);
}
given that we fundamentally need to serialize againt schedule() here.
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