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Re: [qemu-s390x] [PATCH v1 for-2.12 5/5] s390x/tcg: wire up STORE CHANNE

From: Cornelia Huck
Subject: Re: [qemu-s390x] [PATCH v1 for-2.12 5/5] s390x/tcg: wire up STORE CHANNEL REPORT WORD
Date: Mon, 4 Dec 2017 18:53:52 +0100

On Mon, 4 Dec 2017 18:34:36 +0100
David Hildenbrand <address@hidden> wrote:

> On 04.12.2017 18:22, Cornelia Huck wrote:
> > On Mon,  4 Dec 2017 13:55:05 +0100
> > David Hildenbrand <address@hidden> wrote:
> >   
> >> We somehow missed that, new kernels require it.  
> > 
> > Why _new_ kernels? I think we have unconditionally issued stcrw since
> > back in 2.2?  
> Okay, the problem is then rather related to my setup. No ccw devices ->
> no stcrw.
> How could we ever add ccw devices to a TCG guest then?

Hotplug never worked before your patches. Coldplug does not create
machine checks and thus does not trigger the guest to do STCRW. (Only
STSCH, in keeping with "all channel I/O acronyms look the same".)

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