Re: [Xen-devel] Re: Linux Stubdom Problem

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 29/08/2011 17:03, "Stefano Stabellini" <stefano.stabellini@xxxxxxxxxxxxx>
wrote:

>> Oh, so it will.  You'd need to arrange for that to be called from inside
>> the guest; or you could implement an add_to_physmap space for it; that
>> could be called from another domain.
> 
> "From inside the guest" means hvmloader?
> The good thing about doing it in hvmloader is that we could use the
> traditional PV frontend/backend mechanism to share pages. On the other
> hand hvmloader doesn't know if we are using stubdoms at the moment and
> it would need to issue the grant table hypercall only in that case.
> Unless we decide to always grant the videoram to guests but it would
> change once again the domain to which the videoram is accounted for
> (dom0/stubdom rather than the guest, that is a bad thing).
> Also I don't like the idea of making hvmloader stubdom aware.

I don't see a problem with it, in principle. I see hvmloader as almost an
in-guest part of the toolstack. The fact that it only executes at guest boot
means it can be fairly closely tied to the toolstack version.

 -- Keir



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