Re: [Xen-devel] [RFC + Queries] Flow of PCI passthrough in ARM

[manish jaggi <manishjaggi.oss@xxxxxxxxx>]

On 6 November 2014 21:18, Stefano Stabellini
<stefano.stabellini@xxxxxxxxxxxxx> wrote:
> On Thu, 6 Nov 2014, manish jaggi wrote:
>> On 20 October 2014 20:24, Stefano Stabellini
>> <stefano.stabellini@xxxxxxxxxxxxx> wrote:
>> > On Mon, 20 Oct 2014, manish jaggi wrote:
>> >> On 8 October 2014 20:21, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> 
>> >> wrote:
>> >> > On Wed, Oct 08, 2014 at 07:17:48PM +0530, manish jaggi wrote:
>> >> >> On 8 October 2014 19:15, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
>> >> >> > On Wed, 2014-10-08 at 19:07 +0530, manish jaggi wrote:
>> >> >> >> Thanks for replying. As detailed in this thread, I need to create a
>> >> >> >> hypercall that would send the following information to Xen at the 
>> >> >> >> time
>> >> >> >> of PCI attach
>> >> >> >> { sbdf , domU sbdf, domainId }.
>> >> >> >> I am not able to find a way to get the domU sbdf from dom0 at the 
>> >> >> >> time
>> >> >> >> of pci-attach.
>> >> >> >
>> >> >> > I think it would need to be done by the pciback driver in the dom0
>> >> >> > kernel, which AFAIK is the thing which consistently knows both 
>> >> >> > physical
>> >> >> > and virtual sbdf for a given assigned device.
>> >> >> >
>> >> >> > Ian.
>> >> >> >
>> >> >> Correct, can you point out which data structure holds the domU sbdf
>> >> >> corresponding to the actual sbdf in pciback.
>> >> >
>> >> > See 'xen_pcibk_export_device' or 'xen_pcibk_publish_pci_root'
>> >> > is that what you are referring to?
>> >>
>> >> Xen docs also mention about xen-pciback.passthrough=1. If I set this
>> >> in dom0 i see that the device is enumerated as the same sbdf in domU,
>> >> but
>> >> a) it is not shown in lspci
>> >> b) no front-back communication is done for reading devices configuration 
>> >> space
>> >> .
>> >> Is option useful / fully implemented for ARM ?
>> >
>> > I don't think this option is very useful. I wouldn't worry about it for
>> > now.
>>
>> Stefano / Ian / Konard / Julien,
>>
>> Attached is a first raw code FYI RFC Patches of PCI passthrough support on 
>> ARM.
>> - Linux Patch (3.18)
>> - Xen Patch  (4.5 staging)
>> ---(Smmu changes not included, thats a separate patch altogether)
>> This patches show the logic, at places need of improvements in code
>> organization/quality. I wanted to share to get initial comments.
>> This is working with SRIOV as well.
>>
>> Please have a look and let me know your positive comments
>
> Please send as individual inline patches. not attachments.
> Please also add a proper description to each patch and an entry 0/N email
> with the high level explanation of your work.
>
> See http://wiki.xenproject.org/wiki/Submitting_Xen_Project_Patches
Stefano I just wanted to share the patches as reference to our
discussion on the approach. Please recall I had shared in this mail a
design flow. These are just an extension to it. I wanted to move this
discussion to a conclusion

There are not patches which I am submitting to xen git.
If you are ok with the approach I will formally send the patches post
4.5 release.

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