On 23/08/2013 00:55, Neel Natu wrote: > Hi, > > The projects/bhyve_npt_pmap branch modifies the amd64/pmap to be able to > deal with Intel EPT mappings in addition to the regular x86 page tables. > > This provides bhyve with the following features: > > 1. Memory overcommit > Guest memory is now pageable and therefore virtual machines can allocate > more memory than is physically available on the host.
I always wondered about virtualization environments which have pageable guest memory - how does the guest kernel handle situations where it really needs non-pageable memory? Does is simply "not care" because for it the memory access looks just like it isn't paged but is simply very, very slow? What about time-sensitive situations (like the originally mentioned PCI-passthrough)?
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