[PULL,v1,24/32] tpm-tis: check that at most one TPM device exists

Commit Message

Stefan Berger Dec. 16, 2017, 5:41 p.m. UTC

From: Marc-André Lureau <[e-mail]>

Signed-off-by: Marc-André Lureau <[e-mail]>
Reviewed-by: Stefan Berger <[e-mail]>
Signed-off-by: Stefan Berger <[e-mail]>
---
 hw/tpm/tpm_tis.c | 5 +++++
 1 file changed, 5 insertions(+)

Patch

diff --git a/hw/tpm/tpm_tis.c b/hw/tpm/tpm_tis.c
index 0a23203..db101b6 100644
--- a/hw/tpm/tpm_tis.c
+++ b/hw/tpm/tpm_tis.c
@@ -1061,6 +1061,11 @@  static void tpm_tis_realizefn(DeviceState *dev, Error **errp)
 {
     TPMState *s = TPM(dev);
 
+    if (!tpm_find()) {
+        error_setg(errp, "at most one TPM device is permitted");
+        return;
+    }
+
     s->be_driver = qemu_find_tpm_be(s->backend);
     if (!s->be_driver) {
         error_setg(errp, "backend driver with id %s could not be found",