Re: [Qemu-devel] [PATCH 3/3] s390x/css: generate channel path initialized CRW for channel path hotplug

[Dong Jia Shi]

* Cornelia Huck <address@hidden> [2017-07-28 14:58:19 +0200]:

[...]

> > 
> > If I understand you correctly it ain't possible to handle these
> > in the host (and let the guest a simple 'non-real' virtual
> > channel path whose reliability depends on what the host does),
> > or?
> 
> It is possible. Mapping to a virtual channel path or not is basically a
> design decision (IIRC, z/VM supports both).
> 
> Mapping everything to a virtual chpid basically concentrates all
> path-related handling in the hypervisor. This allows for a dumb guest
> OS, but can make errors really hard to debug from the guest side.
I understood this.

> 
> Exposing real channel paths to the guest means that the guest OS needs
> to be able to deal with path-related things, but OTOH it has more
> control. As I don't think we'll ever want to support a guest OS that
> does not also run under LPAR, I'd prefer that way.
> 
My poor English... Sorry, I don't undersatnd the last sentence...

[...]

-- 
Dong Jia Shi