Re: [Xen-devel] Unshared IOMMU issues

[Julien Grall <julien.grall@xxxxxxx>]

On 21/02/17 10:39, Oleksandr Tyshchenko wrote:
> Hi, Julien.
Hi Oleksandr,

> On Mon, Feb 20, 2017 at 10:31 AM, Julien Grall <julien.grall@xxxxxxx> wrote:
> > Hello Oleksandr,
> >
> > On 02/17/2017 08:20 PM, Oleksandr Tyshchenko wrote:
> > > Hi, all.
> > >
> > > So, as I understand we have two possible solutions for the IOMMU page
> > > table to be populated:
> > > 1.  When the first device is being assigned. Retrieve all mappings
> > > from stage-2 table.
> > > 2.  When the domain is being created.
> > >
> > > I would prefer the second variant.
> >
> > I am happy with the second variant as long as IOMMU is not enabled by
> > default when the guest will have no device assigned.
> OK.
>
> Just to clarify.
> We don't need to assign devices when creating domain (at the
> iommu_domain_init() time).
> We just need to have some knowledge about device assignment in general
> (will the guest have assigned devices or won't) .
> And only in case when the guest is going to have assigned devices we
> will populate IOMMU page table (call iommu_construct()).
> Right?
That's correct.

Cheers,

--
Julien Grall

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