Re: passing through SMBus

[Shailesh Kumar <tsaileshkumar@gmail.com>]

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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@citrix.com>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 ?
>
> ~Andrew
>
>
>  On Thu, Nov 14, 2013 at 2:55 AM, Andrew Cooper <andrew.cooper3@citrix.com
> > 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.
>>
>>  thanks
>> tsk
>>
>>
>>  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?
>>
>> ~Andrew
>>
>>
>
>

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