[libvirt] [PATCH 04/13] qemu: Enable PCI multi bus for S390 guests

[Xiao Feng Ren]

From: Yi Min Zhao <zyimin at linux.ibm.com>

QEMU on s390 supports PCI multibus since forever. But zPCI, as extension
of PCI device on s390, is the significant capability. Only when zPCI
capability is existing, we consider QEMU supports PCI multibus properly.
So let enable PCI multibus only if zPCI is supported.

Signed-off-by: Yi Min Zhao <zyimin at linux.ibm.com>
Reviewed-by: Boris Fiuczynski <fiuczy at linux.vnet.ibm.com>
Reviewed-by: Stefan Zimmermann <stzi at linux.ibm.com>
Reviewed-by: Bjoern Walk <bwalk at linux.vnet.ibm.com>
---
 src/qemu/qemu_capabilities.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index e6fd7ee468..3d4f64ca09 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -1716,6 +1716,9 @@ bool virQEMUCapsHasPCIMultiBus(virQEMUCapsPtr qemuCaps,
         return false;
     }
 
+    if (ARCH_IS_S390(def->os.arch))
+        return virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_ZPCI);
+
     /* If 'virt' supports PCI, it supports multibus.
      * No extra conditions here for simplicity.
      */
-- 
2.16.3