Rowhammer, hardware choice, and QubesOS

[Demi M. Obenour]

Dear Qubes Community:

I am considering purchasing a new laptop for various reasons,
including both security and wanting additional memory. However,
I am worried about rowhammer attacks. Is there a list of laptops
that come with RAM that has been found not vulnerable to Rowhammer?
If not, is there a list of RAM models that are not vulnerable, and
which I could replace the RAM with afterwards?

Additionally, would it be possible to implement anti-Rowhammer defenses
in Xen? This could include arranging page tables such that rows of
RAM belonging to different qubes are separated by a gap, which would
prevent the attack from breaking Qubes-provided isolation.

Sincerely,

Demi