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xen-ia64-devel
Re: [Xen-ia64-devel] [Patch] Add more dom0 operations
Hi Kevin,
> 3. I'm not sure why latest check-in about DOM0_GETMEMLIST differs much
> from x86 behavior. Could you explain a bit about that? IMHO, XEN/IA64
> can have same syntax as x86 easily, since page allocator already
> aggregates available pages list under domain struct. So a different
> version is provided enclosed by CONFIG_VTI. If we can set on the same
> page later, it may be extracted out then.
This is my code so I'll explain. I don't have a particular attachment
to this solution, I'm happy to discuss it.
My first issue with the x86 DOM0_GETMEMLIST is that it looks at the
_allocated_ list. This could interfere with use of alloc_domheap_pages
in the hypervisor, as the user's call to DOM0_GETMEMLIST may include any
pages that have been allocated by the hypervisor from the domain's heap.
I notice for instance that your VMMU code uses alloc_domheap_pages.
The other issue is that the pages need to be added to the target
domain's mfn/pfn mapping. I was trying to avoid adding more
IA64-specific hypercalls by doing the allocation and mapping within
DOM0_GETMEMLIST. Perhaps you can say more about your userspace
implementation (i.e. xc_linux_build or equivalent). How do you map
the pages into the target domain's physical address space?
Matt
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