[libvirt] [PATCH v3 3/3] Honor blacklist for modprobe command

[John Ferlan]

https://bugzilla.redhat.com/show_bug.cgi?id=1045124

When loading modules, libvirt does not honor the modprobe blacklist.
Use the new virKModLoad() API in order to attempt load with blacklist check.
Use the new virKModIsBlacklisted() API to check if the failure to load
was due to the blacklist

Signed-off-by: John Ferlan <jferlan at redhat.com>
---
 src/util/virpci.c | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/src/util/virpci.c b/src/util/virpci.c
index e2d222e..41735eb 100644
--- a/src/util/virpci.c
+++ b/src/util/virpci.c
@@ -42,6 +42,7 @@
 #include "vircommand.h"
 #include "virerror.h"
 #include "virfile.h"
+#include "virkmod.h"
 #include "virstring.h"
 #include "virutil.h"
 
@@ -990,18 +991,26 @@ recheck:
     VIR_FREE(drvpath);
 
     if (!probed) {
-        const char *const probecmd[] = { MODPROBE, driver, NULL };
+        char *errbuf = NULL;
         probed = true;
-        if (virRun(probecmd, NULL) < 0) {
-            char ebuf[1024];
-            VIR_WARN("failed to load driver %s: %s", driver,
-                     virStrerror(errno, ebuf, sizeof(ebuf)));
-            return -1;
+        if ((errbuf = virKModLoad(driver, true))) {
+            VIR_WARN("failed to load driver %s: %s", driver, errbuf);
+            VIR_FREE(errbuf);
+            goto cleanup;
         }
 
         goto recheck;
     }
 
+    /* If we know failure was because of blacklist, let's report that */
+    if (virKModIsBlacklisted(driver)) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("Failed to load PCI stub module %s: "
+                         "administratively prohibited"),
+                       driver);
+    }
+
+cleanup:
     return -1;
 }
 
@@ -1313,9 +1322,10 @@ virPCIDeviceDetach(virPCIDevicePtr dev,
                    virPCIDeviceList *inactiveDevs)
 {
     if (virPCIProbeStubDriver(dev->stubDriver) < 0) {
-        virReportError(VIR_ERR_INTERNAL_ERROR,
-                       _("Failed to load PCI stub module %s"),
-                       dev->stubDriver);
+        if (virGetLastError() == NULL)
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("Failed to load PCI stub module %s"),
+                           dev->stubDriver);
         return -1;
     }
 
-- 
1.8.4.2