[PATCH v5 2/4] qemu: Add PCI-Express root to ARM virt machine

[Pavel Fedin <p.fedin@xxxxxxxxxxx>]

Here we assume that if qemu supports generic PCI host controller,
it is a part of virt machine and can be used for adding PCI devices.

In qemu this is actually a PCIe bus, so we also declare multibus
capability so that 0'th bus is specified to qemu correctly as 'pcie.0'

Signed-off-by: Pavel Fedin <p.fedin@xxxxxxxxxxx>
---
 src/qemu/qemu_capabilities.c |  8 ++++++++
 src/qemu/qemu_domain.c       | 17 +++++++++++++----
 2 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index d570fdd..f3486c7 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -2138,6 +2138,14 @@ bool virQEMUCapsHasPCIMultiBus(virQEMUCapsPtr qemuCaps,
         return false;
     }
 
+    if (ARCH_IS_ARM(def->os.arch)) {
+        /* If 'virt' supports PCI, it supports multibus.
+         * No extra conditions here for simplicity.
+         */
+        if (STREQ(def->os.machine, "virt"))
+            return true;
+    }
+
     return false;
 }
 
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 8b050a0..c7d14e4 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -981,7 +981,7 @@ virDomainXMLNamespace virQEMUDriverDomainXMLNamespace = {
 static int
 qemuDomainDefPostParse(virDomainDefPtr def,
                        virCapsPtr caps,
-                       void *opaque ATTRIBUTE_UNUSED)
+                       void *opaque)
 {
     bool addDefaultUSB = true;
     bool addImplicitSATA = false;
@@ -1030,12 +1030,21 @@ qemuDomainDefPostParse(virDomainDefPtr def,
         break;
 
     case VIR_ARCH_ARMV7L:
-       addDefaultUSB = false;
-       addDefaultMemballoon = false;
-       break;
     case VIR_ARCH_AARCH64:
        addDefaultUSB = false;
        addDefaultMemballoon = false;
+       if (STREQ(def->os.machine, "virt") ||
+           STRPREFIX(def->os.machine, "virt-")) {
+           virQEMUDriverPtr driver = opaque;
+
+           /* This condition is actually a (temporary) hack for test suite which
+            * does not create capabilities cache */
+           if (driver->qemuCapsCache) {
+               virQEMUCapsPtr qemuCaps =
+                   virQEMUCapsCacheLookup(driver->qemuCapsCache, def->emulator);
+               addPCIeRoot = virQEMUCapsGet(qemuCaps, QEMU_CAPS_OBJECT_GPEX);
+           }
+       }
        break;
 
     case VIR_ARCH_PPC64:
-- 
1.9.5.msysgit.0

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