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Re: [Xen-devel] Reducing or removing direct map from xen (was Re: Ongoing/future speculative mitigation work)

On Wed, Feb 20, 2019 at 01:09:56PM +0000, Wei Liu wrote:
> I think under-allocate-then-map looks plausible. xmalloc will need
> to allocate pages, put them into an array and call __vmap on that array
> directly.

The biggest issue with this approach is that we now need an array of
1UL<<MAX_ORDER to accommodate mfns. Back of envelope calculation: on x86
this is going to be (1UL<<20)*8 bytes long. This is not feasible.


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