qemu: Add arch checks to qemuDomainMachine*()

There is very little overlap in the machine types available
on different architectures, so broadly speaking checking the
machine type is usually enough; regardless, it's better to
check the architecture as well.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>

src/qemu/qemu_domain.c

@@ -9877,8 +9877,11 @@ qemuFindAgentConfig(virDomainDefPtr def)
 
 bool
 qemuDomainMachineIsQ35(const char *machine,
-                       const virArch arch ATTRIBUTE_UNUSED)
+                       const virArch arch)
 {
+    if (!ARCH_IS_X86(arch))
+        return false;
+
     return (STRPREFIX(machine, "pc-q35-") ||
             STREQ(machine, "q35"));
 }
@@ -9886,8 +9889,11 @@ qemuDomainMachineIsQ35(const char *machine,
 
 bool
 qemuDomainMachineIsI440FX(const char *machine,
-                          const virArch arch ATTRIBUTE_UNUSED)
+                          const virArch arch)
 {
+    if (!ARCH_IS_X86(arch))
+        return false;
+
     return (STREQ(machine, "pc") ||
             STRPREFIX(machine, "pc-0.") ||
             STRPREFIX(machine, "pc-1.") ||
@@ -9898,8 +9904,11 @@ qemuDomainMachineIsI440FX(const char *machine,
 
 bool
 qemuDomainMachineIsS390CCW(const char *machine,
-                           const virArch arch ATTRIBUTE_UNUSED)
+                           const virArch arch)
 {
+    if (!ARCH_IS_S390(arch))
+        return false;
+
     return STRPREFIX(machine, "s390-ccw");
 }
 
@@ -9964,10 +9973,13 @@ qemuDomainMachineHasBuiltinIDE(const char *machine,
 
 bool
 qemuDomainMachineNeedsFDC(const char *machine,
-                          const virArch arch ATTRIBUTE_UNUSED)
+                          const virArch arch)
 {
     const char *p = STRSKIP(machine, "pc-q35-");
 
+    if (!ARCH_IS_X86(arch))
+        return false;
+
     if (p) {
         if (STRPREFIX(p, "1.") ||
             STREQ(p, "2.0") ||