On Mon, May 18, 2020 at 11:26 AM Luck, Tony <tony.l...@intel.com> wrote: [..] > N.B. Linux wants to switch the page to uncacheable so that in the > persistant memory case the filesytem code can continue to access > the other "blocks" in the page, rather than lose all of them. That's > futile in the case where the VMM took the whole 4K away. Maybe Dan > needs to think about the guest case too.
I think increasing the blast-radius to 4K is the best we can do without a paravirt mechanism to coordinate errors. There's also the existing problem that set_mce_nospec() fails on pmem due to the memtype lookup.
