Re: [Qemu-devel] [PATCH v4 09/10] s390x/kvm: msi route fixup for non-pci

[Cornelia Huck <cohuck@redhat.com>]

On Mon, 21 Aug 2017 17:30:58 +0200
Halil Pasic <pasic@linux.vnet.ibm.com> wrote:

> On 08/21/2017 05:17 PM, Thomas Huth wrote:
> > On 21.08.2017 17:10, Halil Pasic wrote:
> > [...]  
> >> The situation is just complicated by the fact that there is code which
> >> relies on assert(true) asserting for correctness (e.g. virtio goes so far
> >> to make builds with normal asserts disabled fail). Thus for me it's hard
> >> to assume that the assertion is guaranteed to be disabled in production.  
> > 
> > FYI: https://lists.gnu.org/archive/html/qemu-devel/2017-08/msg03608.html
> > 
> >  Thomas
> >   
> 
> Thanks, I've missed that. With that assumed it becomes either
> assert(false) or return -ENODEV but not both.
> 
> Regards,
> Halil 
> 

Thinking about this some more, this seems to be completely covered
within the next statement:

- For builds with pci completely disabled, we'll end up with NULL in
  both s390_get_phb() and s390_pci_find_dev_by_idx() and return -ENODEV.
- If only the zpci facility bit is not set, we'll hit the assert in
  s390_get_phb().

Without an error message, there does not really seem to be additional
value (other than failing explicitly), so I'll drop this patch.

(Yeah, deja vu...)