On Thu, Sep 30, 2021 at 05:28:12PM +0000, Luck, Tony wrote:
> > Question is, can we even access a hwpoisoned page to retrieve that data
> > or are we completely in the wrong weeds here? Tony?
>
> Hardware scope for poison is a cache line (64 bytes for DDR, may be larger
> for the internals of 3D-Xpoint memory).
I don't mean from the hw aspect but from the OS one: my simple thinking
is, *if* a page is marked as HW poison, any further mapping or accessing
of the page frame is prevented by the mm code.
So you can't access *any* bits there so why do we even bother with whole
or not whole page? Page is gone...
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
