Jeremy Fitzhardinge wrote:
It might be interesting if the two cases could be unified in some way,
so that the VMMs could use a common usermode mechanism to achieve the
same end, which is what Carsten was proposing. But its not obvious to
me how much common mechanism can be pulled out, since its a pretty
deeply architecture-specific operation.
The big difference here is that LinuxOnLinux does represent guest
virtual addressing in these mm structs where all other kernel based
VMMs do represent guest physical in the user address space. That
somewhat disqualifies LinuxOnLinux to share the commonality.
Whether or not proposed patch makes sense for shaddow page tables is
unknown to me, since we have nested paging on s390.
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