schema: add TPM emulator <source type='dir' path='..'>

Learn to parse a directory for the TPM state.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>

docs/formatdomain.rst

@@ -8199,7 +8199,8 @@ Example: usage of the TPM Emulator
 
    ``type``
       The type of storage. It's possible to provide "file" to utilize a single
-      file or block device where the TPM state will be stored.
+      file or block device where the TPM state will be stored, or "dir" for the
+      directory where the files will be stored.
 
    ``path``
       The path to the TPM state storage.

src/conf/domain_conf.c

@@ -1326,6 +1326,7 @@ VIR_ENUM_IMPL(virDomainTPMSourceType,
               VIR_DOMAIN_TPM_SOURCE_TYPE_LAST,
               "default",
               "file",
+              "dir",
 );
 
 VIR_ENUM_IMPL(virDomainTPMPcrBank,

src/conf/domain_conf.h

@@ -1466,6 +1466,7 @@ typedef enum {
 typedef enum {
     VIR_DOMAIN_TPM_SOURCE_TYPE_DEFAULT = 0,
     VIR_DOMAIN_TPM_SOURCE_TYPE_FILE,
+    VIR_DOMAIN_TPM_SOURCE_TYPE_DIR,
 
     VIR_DOMAIN_TPM_SOURCE_TYPE_LAST
 } virDomainTPMSourceType;

src/conf/schemas/domaincommon.rng

@@ -5985,12 +5985,24 @@
   <define name="tpm-backend-emulator-source">
     <optional>
       <element name="source">
-        <attribute name="type">
-          <value>file</value>
-        </attribute>
-        <attribute name="path">
-          <ref name="absFilePath"/>
-        </attribute>
+        <choice>
+          <group>
+            <attribute name="type">
+              <value>file</value>
+            </attribute>
+            <attribute name="path">
+              <ref name="absFilePath"/>
+            </attribute>
+          </group>
+          <group>
+            <attribute name="type">
+              <value>dir</value>
+            </attribute>
+            <attribute name="path">
+              <ref name="absDirPath"/>
+            </attribute>
+          </group>
+        </choice>
       </element>
     </optional>
   </define>

tests/qemuxmlconfdata/tpm-emulator-tpm2-enc.xml

@@ -30,6 +30,7 @@
     <tpm model='tpm-tis'>
       <backend type='emulator' version='2.0'>
         <encryption secret='32ee7e76-2178-47a1-ab7b-269e6e348015'/>
+        <source type='dir' path='/some/dir'/>
       </backend>
     </tpm>
     <audio id='1' type='none'/>