Re: [PATCH v2 07/11] x86, memory_failure: Introduce {set, clear}_mce_nospec()

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On Sat, Jun 02, 2018 at 10:23:20PM -0700, Dan Williams wrote:
> +static inline int set_mce_nospec(unsigned long pfn)
> +{
> +	int rc;
> +
> +	rc = set_memory_uc((unsigned long) __va(PFN_PHYS(pfn)), 1);

You should really do the decoy_addr thing here that I had in mce_unmap_kpfn().
Putting the virtual address of the page you mustn't accidentally prefetch
from into a register is a pretty good way to make sure that the processor
does do a prefetch.

-Tony




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