Carsten Otte wrote:
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.
From an interface perspective, I think nested paging and shadow
pagetables should be identical; after all, shadow pagetables are just a
software implementation of nested pagetables. There seem to be 3
distinct types of VMM pagetable:
1. UML/LoL vmas-as-pagetable/tlb
2. shadow/nested paging
3. direct paging
The multiple address space patch definitely makes sense for 1, but 2&3
both implement the alternate address space by directly pointing the
CPU's paging hardware at a new pagetable, rather than going via the
Linux VM.
J
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