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Re: [Xen-devel] [PATCH]: xl: pci multi-function passthrough v2

To: Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH]: xl: pci multi-function passthrough v2
From: Simon Horman <horms@xxxxxxxxxxxx>
Date: Mon, 9 Aug 2010 16:27:03 -0400
Cc: Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
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On Mon, Aug 09, 2010 at 01:00:39PM +0100, Gianni Tedesco wrote:
> Changes since last time:
>  1. Incorporate Stefanos feedback wrt. coding style, commenting
>     non-obvious code and making single-function a special-case of
>     multi-function
>  2. Also fix the case for passing through a single sub-function and
>     re-mapping it as a single-function virtual device. (ie: pfunc =
>     non-zero, vfunc = zero). Apparently needed for SR-IOV.
>  3. One-liner format change in xl pci-list-assignable to make it
>    print a copy-and-pasteable BDF.
> 8<----------------------------------------
> Implement PCI pass-through for multi-function devices. The supported BDF
> notation is: BB:DD.* - therefore passing-through a subset of functions or
> remapping the function numbers is not supported except for when passing
> through a single function which will be a virtual function 0.

Is there any plan to extend this to allow for re-mapping and the like.
When I worked on the original multi-function support (last year)
this seemed to be a requirement of some people.

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