Re: [Qemu-devel] [PATCH v2 24/28] tpm-tis: check that at most one TPM device exists

[Stefan Berger]

On 11/06/2017 01:39 PM, Marc-André Lureau wrote:

Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com>

Reviewed-by: Stefan Berger <stef...@linux.vnet.ibm.com>

---
  hw/tpm/tpm_tis.c | 5 +++++
  1 file changed, 5 insertions(+)

diff --git a/hw/tpm/tpm_tis.c b/hw/tpm/tpm_tis.c
index 175785b9c4..dccc56ab09 100644
--- a/hw/tpm/tpm_tis.c
+++ b/hw/tpm/tpm_tis.c
@@ -1057,6 +1057,11 @@ 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",