On Mon, 2007-07-23 at 13:27 +0300, Avi Kivity wrote:
> Having an address_space (like your patch does) is remarkably simple, and
> requires few hooks from the current vm. However using existing vmas
> mapped by the user has many advantages:
>
> - compatible with s390 requirements
> - allows the user to use hugetlbfs pages, which have a performance
> advantage using ept/npt (but which are unswappable)
> - allows the user to map a file (which can be regarded as way to specify
> the swap device)
> - better ingration with the rest of the vm
You don't need to expose the vmas. You just have userspace point out
the start+len of each region of memory it wants the guest to be able to
access, and the address it wants it to appear in the guest.
This is a slight superset of what lguest does in two ways:
1) my guest address == user address, but I'm looking at adding an offset
so I don't have to link the launcher binary specially.
2) I have only one contiguous region of guest-physical memory, since I
can place device memory immediately above "normal" mem.
But the result is pretty sweet, and doesn't require any new symbols to
be exported.
Cheers,
Rusty.
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