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Re: [Qemu-devel] [PATCH 8/8] s390: Add new channel I/O based virtio tran
From: |
Alexander Graf |
Subject: |
Re: [Qemu-devel] [PATCH 8/8] s390: Add new channel I/O based virtio transport. |
Date: |
Wed, 16 Jan 2013 18:05:17 +0100 |
On 16.01.2013, at 17:46, Richard Henderson wrote:
> $SUBJECT reminds me that the tcg s390x port is now prepared
> to implement channel insns, but previously there were no
> channels worth talking about:
>
>> /* I/O Instructions. For each we simply indicate non-operation. */
>> C(0xb276, XSCH, S, Z, 0, 0, 0, 0, subchannel, 0)
>> C(0xb230, CSCH, S, Z, 0, 0, 0, 0, subchannel, 0)
>> C(0xb231, HSCH, S, Z, 0, 0, 0, 0, subchannel, 0)
>> C(0xb232, MSCH, S, Z, 0, 0, 0, 0, subchannel, 0)
>> C(0xb23b, RCHP, S, Z, 0, 0, 0, 0, subchannel, 0)
>> C(0xb238, RSCH, S, Z, 0, 0, 0, 0, subchannel, 0)
>> C(0xb233, SSCH, S, Z, 0, 0, 0, 0, subchannel, 0)
>> C(0xb234, STSCH, S, Z, 0, 0, 0, 0, subchannel, 0)
>> C(0xb235, TSCH, S, Z, 0, 0, 0, 0, subchannel, 0)
>
> With a bit of help, I can make these emulated insns implement
> virtio as well.
Cool! I would assume that
http://marc.info/?l=linux-s390&m=135488344028834&w=2
and most of this thread
http://lists.gnu.org/archive/html/qemu-devel/2012-12/msg00837.html
would be enough help to actually implement them. Though I'd personally prefer
if we can get the IBM folks to do a proper implementation that works for KVM
first. Once that is there, doing the rest of the plumbing shouldn't be too hard.
Alex