[Xen-devel] Is: 'basic pci bridge and root device support. 'Was:Re: Discussion about virtual iommu support for Xen guest

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 03.06.16 at 21:51, <konrad.wilk@xxxxxxxxxx> wrote:
>>  For HVMLite, there is specifically no qemu, and we need something which
>> can function when we want PCI Passthrough to work.  I am quite confident
>> that the correct solution here is to have a basic host bridge/root port
>> implementation in Xen (as we already have 80% of this already), at which
>> point we don't need any qemu interaction for PCI Passthough at all, even
>> for HVM guests.
> 
> Could you expand on this a bit?
> 
> I am asking b/c some time ago I wrote in Xen code to construct a full view
> of the bridges->devices (and various in branching) so that I could renumber
> the bus values and its devices (expand them) on bridges. This was solely 
> done
> so that I could use SR-IOV devices on non-SR-IOV capable BIOSes.
> 
> I am wondering how much of the basic functionality (enumeration, keeping
> track, etc) could be worked in this 'basic host bridge/root port' 
> implementation
> idea of yours.

Keep in mind that your work was for the host's PCI, while here
we're talking about the guest's.

Jan


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