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Re: [PATCH] virtio-balloon-pci: Allow setting nvectors, so we can use MS


From: Michael S. Tsirkin
Subject: Re: [PATCH] virtio-balloon-pci: Allow setting nvectors, so we can use MSI-X
Date: Wed, 15 Jan 2025 03:54:27 -0500

On Wed, Jan 08, 2025 at 09:14:35AM -0600, Reza Arbab wrote:
> On Wed, Dec 18, 2024 at 11:37:05AM +0100, David Hildenbrand wrote:
> > No expert on any of that MSi-X / PCI magic, but LGTM
> > 
> > Acked-by: David Hildenbrand <david@redhat.com>
> 
> Thanks David!
> 
> Did anyone else have any comments? Just want to make sure I have things in
> order to get this into the next release.

Causes a CI failure:

https://gitlab.com/mstredhat/qemu/-/jobs/8800804175

In file included from ../hw/virtio/virtio-balloon-pci.c:15:
../hw/virtio/virtio-balloon-pci.c: In function ‘virtio_balloon_pci_class_init’:
../include/qemu/osdep.h:261:35: error: call to ‘qemu_build_not_reached_always’ 
declared with attribute error: code path is reachable
  261 | #define qemu_build_not_reached()  qemu_build_not_reached_always()
      |                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../include/hw/qdev-core.h:956:13: note: in expansion of macro 
‘qemu_build_not_reached’
  956 |             qemu_build_not_reached();                                   
\
      |             ^~~~~~~~~~~~~~~~~~~~~~
../hw/virtio/virtio-balloon-pci.c:69:5: note: in expansion of macro 
‘device_class_set_props’
   69 |     device_class_set_props(dc, virtio_balloon_properties);
      |     ^~~~~~~~~~~~~~~~~~~~~~
[2493/4296] Compiling C object 
libqemu-ppc64-softmmu.a.p/hw_virtio_virtio-scsi-pci.c.o
[2494/4296] Compiling C object 
libqemu-ppc64-softmmu.a.p/hw_virtio_virtio-9p-pci.c.o



> -- 
> Reza Arbab




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