On Wednesday, January 3, 2018 at 7:01:40 PM UTC-5, pixel fairy wrote:
> Since someone has to start this thread,
> 
> Does dom0 matter here, or would patching xen fix this?

Meltdown requires a Xen fix (at a minimum), here's the current:
https://xenbits.xen.org/xsa/advisory-254.html

Spectre is a whole 'nother can of worms.  Not even really fixable in any robust 
way, it seems, but from what I gather reading this paper, it is very hard to 
exploit: https://xenbits.xen.org/xsa/advisory-254.html

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