Re: [RFC PATCH 00/12] s390: virtio: support protected virtualization

David Hildenbrand
2019-04-16T11:50:50Z

On 16.04.19 13:10, Halil Pasic wrote:
> On Fri, 12 Apr 2019 15:47:50 +0200
> David Hildenbrand <david@redhat.com> wrote:
>
>> On 05.04.19 01:16, Halil Pasic wrote:
>>> Enhanced virtualization protection technology may require the use of
>>> bounce buffers for I/O. While support for this was built into the virtio
>>> core, virtio-ccw wasn't changed accordingly.
>>
>> Can you elaborate some more about the general approach (Enhanced
>> virtualization protection technology, ultravisor, concept, issues, how
>> to squeeze it into QEMU/KVM/kernel) etc =
>>
>> For my taste, this cover letter misses some important context :)
>>
>
> I'm aware. Unfortunately we don't have a decision yet about which parts
> of the protected virtualization architecture are going to be PoP
> material.

Oh, okay.

>
> You can get some more context immediately by having a look at Martin's
> features branch and looking at the s390/protvirt and s390/uv patches.

As I don't have time to dig through random branches to
discover/reverse-engineer the obvious, I won't be reviewing this patch
series. But as I am not an I/O expert, this might not be bad at all :)

Maybe other people can help.

>
> I will try to provide more background information for v1. But having
> a remotely complete and reliable documentation will take some time. What
> I can offer at the moment is answers to specific questions.

Waiting for v1 then.

Cheers!

--

Thanks,

David / dhildenb