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

Avi Kivity
2012-09-19T14:57:48Z

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.

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error compiling committee.c: too many arguments to function