From: Marc-André Lureau <marcandre.lureau@redhat.com>
Date: Mon, 6 Nov 2017 18:39:21 +0000 (+0100)
Subject: tpm-tis: check that at most one TPM device exists
X-Git-Tag: pull-nvme-20200902~2067^2~8
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=51a837e908d6f4bbe94469a4a0edcb76348fe964;p=qemu-nvme.git

tpm-tis: check that at most one TPM device exists

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

diff --git a/hw/tpm/tpm_tis.c b/hw/tpm/tpm_tis.c
index 0a23203e75..db101b61d4 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",