[PATCH v4 3/7] qemu: tpm: Conditionally create storage on incoming migration

[Stefan Berger]

Do not create storage if the TPM state files are on shared storage and
there's an incoming migration since in this case the storage directory
must already exist. Also do not run swtpm_setup in this case.

Signed-off-by: Stefan Berger <stefanb at linux.ibm.com>
---
 src/qemu/qemu_tpm.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_tpm.c b/src/qemu/qemu_tpm.c
index 5f89a6bb18..79d7a0e671 100644
--- a/src/qemu/qemu_tpm.c
+++ b/src/qemu/qemu_tpm.c
@@ -556,11 +556,20 @@ qemuTPMEmulatorBuildCommand(virDomainTPMDef *tpm,
     int pwdfile_fd = -1;
     int migpwdfile_fd = -1;
     const unsigned char *secretuuid = NULL;
+    bool create_storage = true;
 
     if (!swtpm)
         return NULL;
 
-    if (qemuTPMEmulatorCreateStorage(tpm, &created, swtpm_user, swtpm_group) < 0)
+    /* Do not create storage and run swtpm_setup on incoming migration over
+     * shared storage
+     */
+    if (incomingMigration &&
+        virFileIsSharedFS(tpm->data.emulator.storagepath) == 1)
+        create_storage = false;
+
+    if (create_storage &&
+        qemuTPMEmulatorCreateStorage(tpm, &created, swtpm_user, swtpm_group) < 0)
         return NULL;
 
     if (tpm->data.emulator.hassecretuuid)
-- 
2.37.3