Messages in this thread | | | Subject | Re: [kvm-devel] [RFC 0/8]KVM: swap out guest pages | From | Rusty Russell <> | Date | Tue, 24 Jul 2007 09:10:18 +1000 |
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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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