[PATCH RESEND 09/20] dac, selinux: skip setting/restoring label for absent PCI devices

[Daniel Henrique Barboza <danielhb413@xxxxxxxxx>]

If the underlying PCI device of a hostdev does not exist in the
host (e.g. a SR-IOV VF that was removed while the domain was
running), skip security label handling for it.

This will avoid errors that happens during qemuProcessStop() time,
where a VF that was being used by the domain is not present anymore.
The restore label functions of both DAC and SELinux drivers will
trigger errors in virPCIDeviceNew().

Signed-off-by: Daniel Henrique Barboza <danielhb413@xxxxxxxxx>
---
 src/security/security_dac.c     | 14 ++++++++++++--
 src/security/security_selinux.c | 14 ++++++++++++--
 2 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/src/security/security_dac.c b/src/security/security_dac.c
index 0085982bb1..a2528aeb2d 100644
--- a/src/security/security_dac.c
+++ b/src/security/security_dac.c
@@ -1266,7 +1266,12 @@ virSecurityDACSetHostdevLabel(virSecurityManagerPtr mgr,
     }
 
     case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI: {
-        g_autoptr(virPCIDevice) pci = virPCIDeviceNew(&pcisrc->addr);
+        g_autoptr(virPCIDevice) pci = NULL;
+
+        if (!virPCIDeviceExists(&pcisrc->addr))
+            break;
+
+        pci = virPCIDeviceNew(&pcisrc->addr);
 
         if (!pci)
             return -1;
@@ -1422,7 +1427,12 @@ virSecurityDACRestoreHostdevLabel(virSecurityManagerPtr mgr,
     }
 
     case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI: {
-        g_autoptr(virPCIDevice) pci = virPCIDeviceNew(&pcisrc->addr);
+        g_autoptr(virPCIDevice) pci = NULL;
+
+        if (!virPCIDeviceExists(&pcisrc->addr))
+            break;
+
+        pci = virPCIDeviceNew(&pcisrc->addr);
 
         if (!pci)
             return -1;
diff --git a/src/security/security_selinux.c b/src/security/security_selinux.c
index 99adf08a15..c018c0708a 100644
--- a/src/security/security_selinux.c
+++ b/src/security/security_selinux.c
@@ -2101,7 +2101,12 @@ virSecuritySELinuxSetHostdevSubsysLabel(virSecurityManagerPtr mgr,
     }
 
     case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI: {
-        g_autoptr(virPCIDevice) pci = virPCIDeviceNew(&pcisrc->addr);
+        g_autoptr(virPCIDevice) pci = NULL;
+
+        if (!virPCIDeviceExists(&pcisrc->addr))
+            break;
+
+        pci = virPCIDeviceNew(&pcisrc->addr);
 
         if (!pci)
             return -1;
@@ -2329,7 +2334,12 @@ virSecuritySELinuxRestoreHostdevSubsysLabel(virSecurityManagerPtr mgr,
     }
 
     case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI: {
-        g_autoptr(virPCIDevice) pci = virPCIDeviceNew(&pcisrc->addr);
+        g_autoptr(virPCIDevice) pci = NULL;
+
+        if (!virPCIDeviceExists(&pcisrc->addr))
+            break;
+
+        pci = virPCIDeviceNew(&pcisrc->addr);
 
         if (!pci)
             return -1;
-- 
2.26.2