qemu: Add tpm-crb QEMU device to the command line

Alter qemuBuildTPMDevStr to format the tpm-crb on the command line
and use the enum range checking for valid model.

Add a test case for the formation of the tpm-crb QEMU device
command line. The qemuxml2argvtest changes cannot use the newer
DO_TEST_CAPS_LATEST since building of the command line involves
calling qemuBuildTPMBackendStr which attempts to open the
path to the device (e.g. /dev/tmp0).

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>

src/qemu/qemu_command.c

@@ -9387,8 +9387,22 @@ qemuBuildTPMDevStr(const virDomainDef *def,
     virBuffer buf = VIR_BUFFER_INITIALIZER;
     const virDomainTPMDef *tpm = def->tpm;
     const char *model = virDomainTPMModelTypeToString(tpm->model);
+    virQEMUCapsFlags flag;
 
-    if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_TPM_TIS)) {
+    switch (tpm->model) {
+    case VIR_DOMAIN_TPM_MODEL_TIS:
+        flag = QEMU_CAPS_DEVICE_TPM_TIS;
+        break;
+    case VIR_DOMAIN_TPM_MODEL_CRB:
+        flag = QEMU_CAPS_DEVICE_TPM_CRB;
+        break;
+    case VIR_DOMAIN_TPM_MODEL_LAST:
+    default:
+        virReportEnumRangeError(virDomainTPMModel, tpm->model);
+        goto error;
+    }
+
+    if (!virQEMUCapsGet(qemuCaps, flag)) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("The QEMU executable %s does not support TPM "
                        "model %s"),

tests/qemuxml2argvdata/tpm-passthrough-crb.args

@@ -0,0 +1,27 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-x86_64 \
+-name TPM-VM \
+-S \
+-machine pc-i440fx-2.12,accel=tcg,usb=off,dump-guest-core=off \
+-m 2048 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid 11d7cd22-da89-3094-6212-079a48a309a1 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-TPM-VM/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-boot order=c,menu=on \
+-usb \
+-tpmdev passthrough,id=tpm-tpm0,path=/dev/tpm0,\
+cancel-path=/sys/class/misc/tpm0/device/cancel \
+-device tpm-crb,tpmdev=tpm-tpm0,id=tpm0 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3

tests/qemuxml2argvtest.c

@@ -2001,6 +2001,8 @@ mymain(void)
 
     DO_TEST("tpm-passthrough",
             QEMU_CAPS_DEVICE_TPM_PASSTHROUGH, QEMU_CAPS_DEVICE_TPM_TIS);
+    DO_TEST("tpm-passthrough-crb",
+            QEMU_CAPS_DEVICE_TPM_PASSTHROUGH, QEMU_CAPS_DEVICE_TPM_CRB);
     DO_TEST_PARSE_ERROR("tpm-no-backend-invalid",
                         QEMU_CAPS_DEVICE_TPM_PASSTHROUGH, QEMU_CAPS_DEVICE_TPM_TIS);