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Re: [Xen-devel] passing through SMBus

My Win7 guest runs on a headless xen hypervisor, so I passthrough the graphics and all other devices except for HDD.

May I know what bits and pieces dom0 will be using from SMBus ? 

I communicate between both the domains using ip because I am using n/w bridge.

I launch windows using xl create command. 

the reason I need SMBus because synaptic has developed their latest touchpad driver based on SMBus, There are other devices which require SMBus for their win drivers to work.

I looked at qemu code xen-vl-extra.c and pass-through.c and looks like for device 1f and function 03 it is failing to pass-through. I also note that dev 1f: func 00 the PCH bus is being getting passed through in pt-graphics.c and I understand it is in the interest of the graphics. 

I do not want to hack the qemu to get the function 03 for dev 1f passed through but I am looking for some neat way of accessing the SMBus from domU. 

Did I answer you questions ? 

On Thu, Nov 14, 2013 at 1:59 PM, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
On 14/11/2013 19:30, Shailesh Kumar wrote:
I am looking for passingthrough the SMBus to the guest.

Please do not drop xen-devel from the CC line, and please do not top-post.

Passing though the host SMBus to a VM is almost certainly going to cause issues.  dom0 will likely be using bits and pieces on the SMBus itself.

How are you trying to connect to your windows VM ?


On Thu, Nov 14, 2013 at 2:55 AM, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
On 14/11/13 03:03, Shailesh Kumar wrote:
Hi All, 

I have a windows 7 as my domU and some windows based drivers are not fully functional (like: touchpad-driver etc ) because they are SMBus based. I was looking at a way to passthrough the SMBus at 00:1f.03 on south bridge ( 00:1f.0), I was debugging at pt-graphics.c and understand that it is detecting the south bridge and passing it through but the other functions for the same dev-id are not getting passed through. Seeking help if someone can help me to get the function '3' also pass through.

I am using Xen-4.2.0 and dom-0 linux kernel is 3.9.4. My dom-0 is Fedora-17-64bit based.


Do you mean that you are looking to pass through the host SMBus to a guest, or that you are looking for qemu to emulate an SMBus?


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