Re: [PATCH/PFC 0/2] s390 host support

[Carsten Otte <cotte-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>]

Avi Kivity wrote:
> I must say I'm pleasantly surprised by this.  I keep thinking of ppc and
> ia64 as additional ports, while ignoring the big daddy of virtualization.
Thank you very much for the warm welcome :-).

>> Similar to the kvm interface on x86, this interface is
>> hardware dependent at this time. Patches apply against 2.6.21, please
>> review.
> 
> It's all greek to me.
Actually I felt the same about reading much of the kvm kernel code. 
Both architectures are rather different, and our task will be to 
identify spots where we can abstract to get code that is common for 
all architectures and find out where we need architecture dependent code.

> The address space and vcpu management are rather different from kvm's,
> however your approach is better and we'll want to move kvm in your
> direction rather than the other way round (specifically the tight vcpu
> <-> task coupling; mmu is more diffcult).
We have tried a file based approach for the cpus before too.

With regard to the memory, I do not quite understand why regular 
pageable user space memory does'nt work with vt and svm. We would 
definetly prefer to keep our virtual machine's memory pageable on 
s390, therefore I guess we need some arch dependent plug that 
allocates the memory. This would boil down to a regular anonymous 
allocation on s390, and to specifically allocated memory on x86.

so long,
Carsten


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