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

>>> On 20.02.19 at 18:08, <wei.liu2@xxxxxxxxxx> wrote:
> 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.

Are we really calling xmalloc() with any number nearly this big?


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