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xen-ia64-devel
RE: [Xen-devel] [BUNDLE] Testing a simpler inter-domain transport
Hi Fred --
My recollection is that we agreed (with the IBM PPC guys also)
that dom0 should use virtual-physical (VP), except for DMA
which would be forced to use a software IOMMU.
Note that Rusty's idt code replaces the existing VBD/VNIF
and grant table mechanism, so it would be nice to ensure
it is more portable before it becomes part of the Xen core.
Dan
> -----Original Message-----
> From: Yang, Fred [mailto:fred.yang@xxxxxxxxx]
> Sent: Monday, February 06, 2006 1:48 PM
> To: Magenheimer, Dan (HP Labs Fort Collins);
> xen-devel@xxxxxxxxxxxxxxxxxxx
> Cc: Rusty Russell; xen-ia64-devel
> Subject: RE: [Xen-devel] [BUNDLE] Testing a simpler
> inter-domain transport
>
> Dan,
>
> From Xen summit, isn't it to be more P2M liked approach due to
> consideration on driver domain and domain0 needs to get P2M for
> VBD/VNIF?
>
> Don't remember there is decision on taking Hypercall only approach and
> dropped P2M table lookup. Any justification here?
>
> -Fred
>
> Magenheimer, Dan (HP Labs Fort Collins) wrote:
> > (I'm sure you meant PPC *and* ia64 ;*)
> >
> > On just a quick skim, one thing to note:
> >
> > IIRC from the summit, domain0 and driver domains for
> > neither PPC nor ia64 will have a p2m lookup table so
> > a p2m translation will require a hypercall. So
> > while virt_to_machine is cheap for domains on x86,
> > it is not on PPC and ia64. If HYPERVISOR_share can
> > take physical addresses instead of machine addresses
> > (with Xen doing the phys_to_machine part of the
> > translation), I think the code would work better
> > for PPC and ia64, as well as better hide the
> > virtual->physical->machine memory abstraction.
> >
> > Dan
> >
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
>
>
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