Re: [Qemu-devel] [PATCH v2 7/7] s390/kvm: In-kernel channel subsystem support.

[Avi Kivity]

On 09/19/2012 05:47 PM, Alexander Graf wrote:
> 
> On 04.09.2012, at 17:13, Cornelia Huck wrote:
> 
>> Handle most support for channel I/O instructions in the kernel itself.
>> 
>> Only asynchronous functions (such as the start function) need to be
>> handled by userspace.
> 
> Phew. This is a lot of code for something that is usually handled in user 
> space in the kvm world. The x86 equivalent would be an in-kernel PCI bus, 
> right? Have you measured major performance penalties when running this from 
> user space?
> 
> Avi, what do you think?

I know nothing of this stuff.  But your request for numbers is justified
of course.



-- 
error compiling committee.c: too many arguments to function