Re: [Xen-devel] [PATCH 4/5] xen/arm: use the physical number of gic lines for boot domains

[Julien Grall <julien.grall@xxxxxxx>]

Hi Stefano,

On 1/3/19 7:07 PM, Stefano Stabellini wrote:
> On Mon, 24 Dec 2018, Julien Grall wrote:
> > Hi,
> >
> > On 12/5/18 5:28 PM, Stefano Stabellini wrote:
> > > We don't have a clear way to know how many virtual SPIs we need for the
> > > boot domains. For simplicity, allocate as many as natively supported,
> > > just like for dom0.
> > This will potentially allocate a lot of unused interrupts and a waste of
> > memory. So is it the correct solution?
> >
> > For instance, we would request the user to provide the number of interrupts.
> Unfortunately, this has to happen much earlier than when we parse user
> supplied device tree options. We could make it an hypervisor command
> line parameter but it would be nasty.
Why does this value needs to be in the supplied device-tree. Can't it be 
part of the node in the host DT?
> Given that this feature is aimed at partitioning scenarios where the
> number of VMs is low, the increased memory overhead is not a big issue.
Please write it down in the commit message.


> (If you recall we briefly discussed this topic at the last Linaro
> Connect, this was the conclusion.)
Cheers,

--
Julien Grall

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