qemu: Improve qemuDomainSupportsPCIMultibus()

Rewrite the function so that it's more compact and easier to
extend as new architectures, which will likely come with
multibus support right out the gate, are introduced.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index ef7506258a7595666d8b8d741cf4d2591edcbe2a..de36641137ef9a3a72acfbc7c2761b052d5edc41 100644 (file)
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -9088,23 +9088,16 @@ qemuDomainSupportsPCI(const virDomainDef *def)
 bool
 qemuDomainSupportsPCIMultibus(const virDomainDef *def)
 {
-    /* x86_64 and i686 support PCI-multibus on all machine types
-     * since forever */
-    if (ARCH_IS_X86(def->os.arch))
-        return true;
-
-    /* PPC supports multibus on all machine types which have pci since qemu-2.0.0 */
-    if (def->os.arch == VIR_ARCH_PPC ||
-        ARCH_IS_PPC64(def->os.arch)) {
+    /* Most architectures support multibus for all machine types on
+     * all supported QEMU versions */
+    if (ARCH_IS_X86(def->os.arch) ||
+        ARCH_IS_PPC(def->os.arch) ||
+        ARCH_IS_S390(def->os.arch)) {
         return true;
     }
 
-    /* S390 supports PCI-multibus. */
-    if (ARCH_IS_S390(def->os.arch))
-        return true;
-
-    /* If the virt machine, both on ARM and RISC-V, supports PCI,
-     * then it also supports multibus */
+    /* In some cases, support for multibus is limited to some machine
+     * types */
     if (qemuDomainIsARMVirt(def) ||
         qemuDomainIsRISCVVirt(def)) {
         return true;