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Re: [Xen-devel] passing through SMBus

On 18/11/13 06:40, Shailesh Kumar wrote:

Did I miss to share any details . 
Let me know if you have more questions for me .

waiting for your suggestions.


Once again, please do not top post.

Qemu has its own chipset emulation.  Attempting to shoehorn part of a host chipset into a virtualised guest chipset is unlikely to work.

If the Win7 vm is on a headless server, why do you need the local mouse if you are connecting via VNC (I am assuming VNC as you only specified 'ip').


On Thu, Nov 14, 2013 at 11:18 PM, Shailesh Kumar <tsaileshkumar@xxxxxxxxx> wrote:
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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