[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH]: xl: pci multi-function passthrough v2
On Mon, 2010-08-09 at 21:27 +0100, Simon Horman wrote: > 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. I am glad you asked I initially planned to support this but it seemed like a nightmare: 1. The BDF notation practically becomes a regex language ;) 2. For HVM, if a function 0 is not passed through then you don't generate an SCI interrupt for PCI hotplug. 3. I couldn't imagine a scenario where this wasn't erroneous thing to do But if someone can convince me that this is a worth-while thing to do (3) then (1) and (2) are just technical problems which can be overcome... Gianni _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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