qemu: tpm: Introduce qemuTPMHasSharedStorage()

New qemuTPMHasSharedStorage() function is introduced which
returns whether the swtpm state directory is on a shared
filesystem (e.g. NFS).

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_migration.c

@@ -38,6 +38,7 @@
 #include "qemu_security.h"
 #include "qemu_slirp.h"
 #include "qemu_block.h"
+#include "qemu_tpm.h"
 
 #include "domain_audit.h"
 #include "virlog.h"

src/qemu/qemu_tpm.c

@@ -954,6 +954,26 @@ qemuTPMEmulatorStart(virQEMUDriver *driver,
 }
 
 
+bool
+qemuTPMHasSharedStorage(virDomainDef *def)
+{
+    size_t i;
+
+    for (i = 0; i < def->ntpms; i++) {
+        virDomainTPMDef *tpm = def->tpms[i];
+
+        switch (tpm->type) {
+        case VIR_DOMAIN_TPM_TYPE_EMULATOR:
+            return virFileIsSharedFS(tpm->data.emulator.storagepath) == 1;
+        case VIR_DOMAIN_TPM_TYPE_PASSTHROUGH:
+        case VIR_DOMAIN_TPM_TYPE_LAST:
+        }
+    }
+
+    return false;
+}
+
+
 /* ---------------------
  *  Module entry points
  * ---------------------

src/qemu/qemu_tpm.h

@@ -56,3 +56,7 @@ int qemuExtTPMSetupCgroup(virQEMUDriver *driver,
                           virCgroup *cgroup)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
     G_GNUC_WARN_UNUSED_RESULT;
+
+bool qemuTPMHasSharedStorage(virDomainDef *def)
+    ATTRIBUTE_NONNULL(1)
+    G_GNUC_WARN_UNUSED_RESULT;