[libvirt] [PATCH] qemu: fix qemuDomainSupportsPCI() for ARM machines of "virt" machinetype

[Laine Stump]

Commit e8d5517 updated the domain post-parse to automatically add
pcie-root et al for certain ARM "virt" machinetypes, but didn't update
the function qemuDomainSupportsPCI() which is called later on when we
are auto-assigning PCI addresses and default settings for the PCI
controller <model> and <target> attributes. The result was that PCI
addresses weren't assigned, and the controllers didn't have their
attribute default values set, leading to an error when the domain was
started, e.g.:

  internal error: autogenerated dmi-to-pci-bridge options not set

This patch duplicates the check made in the earlier patch, so that PCI
address auto-assignment and target/model default values will be set.
---

The example Cole gave in his email reporting this bug is fixed by this
patch.

 src/qemu/qemu_command.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index ae03618..84cbfe1 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -1742,7 +1742,7 @@ qemuCollectPCIAddress(virDomainDefPtr def ATTRIBUTE_UNUSED,
 }
 
 static bool
-qemuDomainSupportsPCI(virDomainDefPtr def)
+qemuDomainSupportsPCI(virDomainDefPtr def, virQEMUCapsPtr qemuCaps)
 {
     if ((def->os.arch != VIR_ARCH_ARMV7L) && (def->os.arch != VIR_ARCH_AARCH64))
         return true;
@@ -1750,6 +1750,11 @@ qemuDomainSupportsPCI(virDomainDefPtr def)
     if (STREQ(def->os.machine, "versatilepb"))
         return true;
 
+    if ((STREQ(def->os.machine, "virt") ||
+         STRPREFIX(def->os.machine, "virt-")) &&
+        virQEMUCapsGet(qemuCaps, QEMU_CAPS_OBJECT_GPEX))
+        return true;
+
     return false;
 }
 
@@ -2267,7 +2272,7 @@ qemuDomainAssignPCIAddresses(virDomainDefPtr def,
         if (!(addrs = qemuDomainPCIAddressSetCreate(def, nbuses, false)))
             goto cleanup;
 
-        if (qemuDomainSupportsPCI(def)) {
+        if (qemuDomainSupportsPCI(def, qemuCaps)) {
             if (qemuValidateDevicePCISlotsChipsets(def, qemuCaps, addrs) < 0)
                 goto cleanup;
 
-- 
2.1.0