Re: [Xen-devel] [PATCH 0/2] Re-factoring passthrough/pci.c and adding place-holder code for ARM/PCI

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.04.15 at 09:37, <mjaggi@xxxxxxxxxxxxxxxxxx> wrote:
> Xen currently does not have PCI support for ARM builds. This patch set
> makes the code compilable for ARM PCI and adds places-holder code
> which would be replaced with PCI pass-through support patch series.
> 
> Re-factor MSI Handling
> -------------
> There is a some x86 specific code which is found in common code:
> xen/drivers/passthrough/pci.c which needs to be re factored.
> 
> MSI/X are configured and handled by dom0 or domU code on ARM64 and is not
> required to be part of common code. However there are functions which are
> used as part of common code and calls to these functions cannot be easily
> re factored like pci_cleanup_msi.

I can only second Julien's reply here: Without explanation (here,
not by reference to some past discussion) how you envision MSI
to work securely when you leave control of it to DomU-s there's
very little point in separating out MSI from PCI code.

Also please make sure you Cc all involved maintainers especially
on non- trivial and potentially controversial patches like these.

Jan


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