Messages in this thread |  | | Subject | Re: [patch 00/21] Xen-paravirt: Xen guest implementation for paravirt_ops interface | From | Rusty Russell <> | Date | Sat, 17 Feb 2007 16:05:42 +1100 |
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On Fri, 2007-02-16 at 13:48 -0800, Zachary Amsden wrote: > Christoph Lameter wrote: > > It still seems to be implemented for Xen and not to support a variety of > > page table methods in paravirt ops. > > Yes, but that is just because the Xen hooks happens to be near the last > part of the merge. VMI required some special hooks, as do both Xen and > lhype (I think ... Rusty can correct me if lhype's puppy's have > precluded the addition of new hooks).
lguest was supposed to be a demonstration of paravirt_ops, so it shouldn't have added any. But note that I did change some other things, such as the esp0 initialization for the swapper.
Puppies are still alive and well. Although Andi not pushing into 2.6.21 (yet?) made puppies sad 8(
> Xen page table handling is very > different, mostly it is trap and emulate so writable page tables can > work, which means they don't always issue hypercalls for PTE updates, > although they do have that option, should the hypervisor MMU model > change, or performance concerns prompt a different model (or perhaps, > migration?)
Yes, Xen really like their direct pagetable stuff. I'm a traditionalist, myself, but it did require some expansion of paravirt_ops.
KVM might well want more, although from here it's more likely we'll move some of the hooks up the stack a little IMHO.
Cheers, Rusty.
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