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xen-devel
Re: [Xen-devel] Re: Linux Stubdom Problem
 
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To:  | 
Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>,	Tim Deegan <tim@xxxxxxx> | 
 
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Subject:  | 
Re: [Xen-devel] Re: Linux Stubdom Problem | 
 
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From:  | 
Keir Fraser <keir.xen@xxxxxxxxx> | 
 
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Date:  | 
Wed, 31 Aug 2011 07:02:07 +0100 | 
 
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Cc:  | 
"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>,	Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>,	Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>,	Jiageng Yu <yujiageng734@xxxxxxxxx>,	Anthony PERARD <anthony.perard@xxxxxxxxx>,	Thibault <samuel.thibault@xxxxxxxxxxxx> | 
 
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Tue, 30 Aug 2011 23:04:38 -0700 | 
 
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[Xen-devel] Re: Linux Stubdom Problem | 
 
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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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