virpcimock: Create PCI devices under /sys/devices/pci*

So far, we are creating devices directly under
/sys/bus/pci/devices/*. There is not much problem with it, but if
we really want to model kernel behaviour we need to create them
under /sys/devices/pciDDDD:BB and then only symlink them from the
old location.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Tested-by: NDaniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: NDaniel Henrique Barboza <danielhb413@gmail.com>

tests/virpcimock.c

@@ -384,12 +384,17 @@ pci_device_get_path(const struct pciDevice *dev,
     if (!(devid = pci_address_format(&dev->addr)))
         return NULL;
 
+    /* PCI devices really do live under /sys/devices/pciDDDD:BB
+     * and then they are just symlinked to /sys/bus/pci/devices/
+     */
     if (file) {
-        ignore_value(virAsprintfQuiet(&ret, "%s" SYSFS_PCI_PREFIX "devices/%s/%s",
-                                      prefix, devid, file));
+        ignore_value(virAsprintfQuiet(&ret, "%s/sys/devices/pci%04x:%02x/%s/%s",
+                                      prefix, dev->addr.domain, dev->addr.bus,
+                                      devid, file));
     } else {
-        ignore_value(virAsprintfQuiet(&ret, "%s" SYSFS_PCI_PREFIX "devices/%s",
-                                      prefix, devid));
+        ignore_value(virAsprintfQuiet(&ret, "%s/sys/devices/pci%04x:%02x/%s",
+                                      prefix, dev->addr.domain, dev->addr.bus,
+                                      devid));
     }
 
     return ret;
@@ -401,6 +406,7 @@ pci_device_new_from_stub(const struct pciDevice *data)
 {
     struct pciDevice *dev;
     VIR_AUTOFREE(char *) devpath = NULL;
+    VIR_AUTOFREE(char *) devsympath = NULL;
     VIR_AUTOFREE(char *) id = NULL;
     VIR_AUTOFREE(char *) devid = NULL;
     char *c;
@@ -489,6 +495,17 @@ pci_device_new_from_stub(const struct pciDevice *data)
     }
     make_symlink(devpath, "iommu_group", tmp);
 
+    if (snprintf(tmp, sizeof(tmp),
+                 "../../../devices/pci%04x:%02x/%s",
+                 dev->addr.domain, dev->addr.bus, devid) < 0) {
+        ABORT("@tmp overflow");
+    }
+
+    if (virAsprintfQuiet(&devsympath, "%s" SYSFS_PCI_PREFIX "devices", fakerootdir) < 0)
+        ABORT_OOM();
+
+    make_symlink(devsympath, devid, tmp);
+
     if (pci_device_autobind(dev) < 0)
         ABORT("Unable to bind: %s", devid);