[libvirt] [PATCH v6 10/13] qemu: Introduce qemuDomainPrepareDiskSource

[John Ferlan]

Introduce a function to setup any TLS needs for a disk source.

If there's a configuration or other error setting up the disk source
for TLS, then cause the domain startup to fail.

For VxHS, if cfg->haveTLS is set, then TLS creds will be added
automatically to every VxHS disk that didn't specify "tls='no'"
in the domain XML. Additionally, if the domain XML has "tls='yes'",
but cfg->haveTLS is not set, then issue a configuration error.

Signed-off-by: John Ferlan <jferlan at redhat.com>
---

 This is NEW from v5. This patch adds the infrastructure to the
 qemuDomainPrepare* family of functions in order to walk the disk
 list looking for disks that need to be set up properly for TLS.
 The code is very similar to the chardev model - except that it
 can cause a failure to start the domain in the event that the
 vxhsTLS = 0, but domain XML haveTLS = yes. Essentially pulling
 in the code from v5 patch5 qemuBuildDiskVxHSTLSinfoCommandLine.


 src/qemu/qemu_domain.c  | 58 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/qemu/qemu_domain.h  |  5 +++++
 src/qemu/qemu_process.c |  4 ++++
 3 files changed, 67 insertions(+)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index cbee151..c3eadf3 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -7520,6 +7520,64 @@ qemuDomainPrepareChardevSource(virDomainDefPtr def,
 }
 
 
+/* qemuProcessPrepareDiskSourceTLS:
+ * @source: pointer to host interface data for disk device
+ * @cfg: driver configuration
+ *
+ * Updates host interface TLS encryption setting based on qemu.conf
+ * for disk devices.  This will be presented as "tls='yes|no'" in
+ * live XML of a guest.
+ *
+ * Returns 0 on success, -1 on bad config/failure
+ */
+static int
+qemuDomainPrepareDiskSourceTLS(virStorageSourcePtr src,
+                               virQEMUDriverConfigPtr cfg)
+{
+
+    /* VxHS doesn't utilize a password protected server certificate,
+     * so no need to add a secinfo for a secret UUID. */
+    if (src->type == VIR_STORAGE_TYPE_NETWORK &&
+        src->protocol == VIR_STORAGE_NET_PROTOCOL_VXHS) {
+
+        if (src->haveTLS == VIR_TRISTATE_BOOL_YES && !cfg->vxhsTLS) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("VxHS TLS protocol is configured in XML, but "
+                             "TLS for VxHS is disabled in qemu.conf"));
+            return -1;
+        }
+
+        if (src->haveTLS == VIR_TRISTATE_BOOL_ABSENT && cfg->vxhsTLS)
+            src->haveTLS = VIR_TRISTATE_BOOL_YES;
+    }
+
+    return 0;
+}
+
+
+/* qemuProcessPrepareDiskSource:
+ * @def: live domain definition
+ * @driver: qemu driver
+ *
+ * Iterate through all disk devices to setup/check any that would be
+ * using TLS.
+ *
+ * Returns 0 on success, -1 on failure
+ */
+int
+qemuDomainPrepareDiskSource(virDomainDefPtr def,
+                            virQEMUDriverConfigPtr cfg)
+{
+    size_t i;
+
+    for (i = 0; i < def->ndisks; i++) {
+        if (qemuDomainPrepareDiskSourceTLS(def->disks[i]->src, cfg) < 0)
+            return -1;
+    }
+
+    return 0;
+}
+
 
 int
 qemuDomainPrepareShmemChardev(virDomainShmemDefPtr shmem)
diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index f93b09b..f701287 100644
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -841,6 +841,11 @@ void qemuDomainPrepareChardevSourceTLS(virDomainChrSourceDefPtr source,
                                        virQEMUDriverConfigPtr cfg)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
 
+int
+qemuDomainPrepareDiskSource(virDomainDefPtr def,
+                            virQEMUDriverConfigPtr cfg)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
+
 void qemuDomainPrepareChardevSource(virDomainDefPtr def,
                                     virQEMUDriverPtr driver)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 364c359..7978ef3 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -5326,6 +5326,10 @@ qemuProcessPrepareDomain(virConnectPtr conn,
     if (qemuDomainMasterKeyCreate(vm) < 0)
         goto cleanup;
 
+    VIR_DEBUG("Prepare disk source backends for TLS");
+    if (qemuDomainPrepareDiskSource(vm->def, cfg) < 0)
+        goto cleanup;
+
     VIR_DEBUG("Prepare chardev source backends for TLS");
     qemuDomainPrepareChardevSource(vm->def, driver);
 
-- 
2.9.5