qemu_domain_address: use virPCIDeviceAddressEqual() in conditionals

A common operation in qemu_domain_address is comparing a
virPCIDeviceAddress and assigning domain, bus, slot and function
to a specific value. The former can be done with the existing
virPCIDeviceAddressEqual() helper, as long as we provide
a virPCIDeviceAddress to compare it to.

The later can be done by direct assignment of the now existing
virPCIDeviceAddress struct. The defined values of domain, bus,
slot and function will be assigned to info->addr.pci, the other
values are zeroed (which happens to be their default values too).
It's also worth noticing that all these assignments are being
conditioned by virDeviceInfoPCIAddressIsPresent() calls, thus it's
sensible to discard any non-zero values that might happen to exist
in @cont->info.addr, if we settled beforehand that @cont->info.addr
is not present or bogus.
Suggested-by: NErik Skultety <eskultet@redhat.com>
Signed-off-by: NDaniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: NErik Skultety <eskultet@redhat.com>

src/qemu/qemu_domain_address.c

@@ -1729,45 +1729,41 @@ qemuDomainValidateDevicePCISlotsPIIX3(virDomainDefPtr def,
     /* Verify that first IDE and USB controllers (if any) is on the PIIX3, fn 1 */
     for (i = 0; i < def->ncontrollers; i++) {
         virDomainControllerDefPtr cont = def->controllers[i];
+        virPCIDeviceAddress primaryIDEAddr = {.domain = 0, .bus = 0,
+                                              .slot = 1, .function = 1};
+        virPCIDeviceAddress piix3USBAddr = {.domain = 0, .bus = 0,
+                                            .slot = 1, .function = 2};
 
         /* First IDE controller lives on the PIIX3 at slot=1, function=1 */
         if (cont->type == VIR_DOMAIN_CONTROLLER_TYPE_IDE &&
             cont->idx == 0) {
             if (virDeviceInfoPCIAddressIsPresent(&cont->info)) {
-                if (cont->info.addr.pci.domain != 0 ||
-                    cont->info.addr.pci.bus != 0 ||
-                    cont->info.addr.pci.slot != 1 ||
-                    cont->info.addr.pci.function != 1) {
+                if (!virPCIDeviceAddressEqual(&cont->info.addr.pci,
+                                              &primaryIDEAddr)) {
                     virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                                   _("Primary IDE controller must have PCI address 0:0:1.1"));
+                                   _("Primary IDE controller must have PCI "
+                                     "address 0:0:1.1"));
                     return -1;
                 }
             } else {
                 cont->info.type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI;
-                cont->info.addr.pci.domain = 0;
-                cont->info.addr.pci.bus = 0;
-                cont->info.addr.pci.slot = 1;
-                cont->info.addr.pci.function = 1;
+                cont->info.addr.pci = primaryIDEAddr;
             }
         } else if (cont->type == VIR_DOMAIN_CONTROLLER_TYPE_USB &&
                    cont->idx == 0 &&
                    (cont->model == VIR_DOMAIN_CONTROLLER_MODEL_USB_PIIX3_UHCI ||
                     cont->model == VIR_DOMAIN_CONTROLLER_MODEL_USB_DEFAULT)) {
             if (virDeviceInfoPCIAddressIsPresent(&cont->info)) {
-                if (cont->info.addr.pci.domain != 0 ||
-                    cont->info.addr.pci.bus != 0 ||
-                    cont->info.addr.pci.slot != 1 ||
-                    cont->info.addr.pci.function != 2) {
+                if (!virPCIDeviceAddressEqual(&cont->info.addr.pci,
+                                              &piix3USBAddr)) {
                     virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                                   _("PIIX3 USB controller at index 0 must have PCI address 0:0:1.2"));
+                                   _("PIIX3 USB controller at index 0 must "
+                                     "have PCI address 0:0:1.2"));
                     return -1;
                 }
             } else {
                 cont->info.type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI;
-                cont->info.addr.pci.domain = 0;
-                cont->info.addr.pci.bus = 0;
-                cont->info.addr.pci.slot = 1;
-                cont->info.addr.pci.function = 2;
+                cont->info.addr.pci = piix3USBAddr;
             }
         } else {
             /* this controller is not skipped in qemuDomainCollectPCIAddress */
@@ -1800,6 +1796,8 @@ qemuDomainValidateDevicePCISlotsPIIX3(virDomainDefPtr def,
          * at slot 2.
          */
         virDomainVideoDefPtr primaryVideo = def->videos[0];
+        virPCIDeviceAddress primaryCardAddr = {.domain = 0, .bus = 0,
+                                               .slot = 2, .function = 0};
 
         if (virDeviceInfoPCIAddressIsWanted(&primaryVideo->info)) {
             memset(&tmp_addr, 0, sizeof(tmp_addr));
@@ -1830,10 +1828,8 @@ qemuDomainValidateDevicePCISlotsPIIX3(virDomainDefPtr def,
                 primaryVideo->info.type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI;
             }
         } else if (!qemuDeviceVideoUsable) {
-            if (primaryVideo->info.addr.pci.domain != 0 ||
-                primaryVideo->info.addr.pci.bus != 0 ||
-                primaryVideo->info.addr.pci.slot != 2 ||
-                primaryVideo->info.addr.pci.function != 0) {
+            if (!virPCIDeviceAddressEqual(&primaryVideo->info.addr.pci,
+                                          &primaryCardAddr)) {
                 virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                                _("Primary video card must have PCI address 0:0:2.0"));
                 return -1;
@@ -1870,6 +1866,8 @@ qemuDomainValidateDevicePCISlotsQ35(virDomainDefPtr def,
 
     for (i = 0; i < def->ncontrollers; i++) {
         virDomainControllerDefPtr cont = def->controllers[i];
+        virPCIDeviceAddress primarySATAAddr = {.domain = 0, .bus = 0,
+                                               .slot = 0x1F, .function = 2};
 
         switch (cont->type) {
         case VIR_DOMAIN_CONTROLLER_TYPE_SATA:
@@ -1879,20 +1877,16 @@ qemuDomainValidateDevicePCISlotsQ35(virDomainDefPtr def,
              */
             if (cont->idx == 0) {
                 if (virDeviceInfoPCIAddressIsPresent(&cont->info)) {
-                    if (cont->info.addr.pci.domain != 0 ||
-                        cont->info.addr.pci.bus != 0 ||
-                        cont->info.addr.pci.slot != 0x1F ||
-                        cont->info.addr.pci.function != 2) {
+                    if (!virPCIDeviceAddressEqual(&cont->info.addr.pci,
+                                                  &primarySATAAddr)) {
                         virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                                       _("Primary SATA controller must have PCI address 0:0:1f.2"));
+                                       _("Primary SATA controller must have "
+                                         "PCI address 0:0:1f.2"));
                         return -1;
                     }
                 } else {
                     cont->info.type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI;
-                    cont->info.addr.pci.domain = 0;
-                    cont->info.addr.pci.bus = 0;
-                    cont->info.addr.pci.slot = 0x1F;
-                    cont->info.addr.pci.function = 2;
+                    cont->info.addr.pci = primarySATAAddr;
                 }
             }
             break;