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Re: [Qemu-devel] [PATCH v2 7/7] s390/kvm: In-kernel channel subsystem su
From: |
Avi Kivity |
Subject: |
Re: [Qemu-devel] [PATCH v2 7/7] s390/kvm: In-kernel channel subsystem support. |
Date: |
Wed, 19 Sep 2012 17:57:26 +0300 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120828 Thunderbird/15.0 |
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
- [Qemu-devel] [RFC PATCH v2 0/7] s390: virtual css host support., Cornelia Huck, 2012/09/04
- [Qemu-devel] [PATCH v2 3/7] s390/kvm: In-kernel handling of I/O instructions., Cornelia Huck, 2012/09/04
- [Qemu-devel] [PATCH v2 4/7] s390: Move css limits from drivers/s390/cio/ to include/asm/., Cornelia Huck, 2012/09/04
- [Qemu-devel] [PATCH v2 1/7] s390/kvm: Support for I/O interrupts., Cornelia Huck, 2012/09/04
- [Qemu-devel] [PATCH v2 5/7] s390: Make some css-related structures usable by non-cio code., Cornelia Huck, 2012/09/04
- [Qemu-devel] [PATCH v2 6/7] s390/kvm: Base infrastructure for enabling capabilities., Cornelia Huck, 2012/09/04
- [Qemu-devel] [PATCH v2 7/7] s390/kvm: In-kernel channel subsystem support., Cornelia Huck, 2012/09/04
- [Qemu-devel] [PATCH v2 2/7] s390/kvm: Add support for machine checks., Cornelia Huck, 2012/09/04
- Re: [Qemu-devel] [RFC PATCH v2 0/7] s390: virtual css host support., Avi Kivity, 2012/09/05