Re: kshmem & ACE

[Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>]

Dor Laor wrote:
>> Hello,
>>
>> I've posted patches for two features, kernel shared memory and Atomic
>>     
> Code
>   
>> Execution, which I believe can be used to implement para-virtualized
>> devices.
>> Could someone recommend a device that might make a good proof
>> of concept? I was thinking may be a block device.
>>     
>
> The KVM has an unmerged PV block device developed by Arjan van de Ven,
> he might be interested.
>
>   
>> Any suggestions and additional comments would be helpful.
>>     
>
> In general IMHO if the PV devices {net, block} are implemented in the
> kernel then they cannot enjoy from the shared memory. If these devices
>   

The emulated block devices already have "shared memory" with the guest 
in the form of DMA since the guest's physical memory is mapped in the 
host's va space.

An interesting PoC may be something akin to XenSocket.  See 
http://www.xensource.com/files/xensummit_4/SuzanneMcIntosh_XenSummit_2007.pdf

Regards,

Anthony Liguori

> are implemented in user space the chances are bigger, although the guest
> memory is mapped by user space anyway.
>
> Maybe you can build a very efficient inter guest communication channel?
>
>   
>> Thanks,
>>
>> Wink Saville
>>
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