qemu: Fix swtpm device with aarch64

Starting a VM with swtpm device fails with qemu-system-aarch64.
E.g. with TPM device config

     <tpm model='tpm-tis'>
       <backend type='emulator' version='2.0'/>
      </tpm>

QEMU reports the following error

error: internal error: process exited while connecting to monitor:
2021-02-07T05:15:35.378927Z qemu-system-aarch64: -device
tpm-tis,tpmdev=tpm-tpm0,id=tpm0: 'tpm-tis' is not a valid device model name

Indeed the TPM device name is 'tpm-tis-device' [1][2] for aarch64,
versus the shorter 'tpm-tis' for x86. The devices are the same from
a functional POV, i.e. they both emulate a TPM device conforming to
the TIS specification. Account for the unfortunate name difference
when building the TPM device option in qemuBuildTPMDevStr(). Also
include a test case for 'tpm-tis-device'.

[1] https://qemu.readthedocs.io/en/latest/specs/tpm.html
[2] c294ac327c

Signed-off-by: Jim Fehlig <jfehlig@suse.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>

src/qemu/qemu_command.c

@@ -9230,6 +9230,9 @@ qemuBuildTPMDevStr(const virDomainDef *def,
     g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
     const char *model = virDomainTPMModelTypeToString(tpm->model);
 
+    if (tpm->model == VIR_DOMAIN_TPM_MODEL_TIS && def->os.arch == VIR_ARCH_AARCH64)
+        model = "tpm-tis-device";
+
     virBufferAsprintf(&buf, "%s,tpmdev=tpm-%s,id=%s",
                       model, tpm->info.alias, tpm->info.alias);
 

tests/qemuxml2argvdata/aarch64-tpm.aarch64-latest.args

@@ -0,0 +1,37 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/tmp/lib/domain--1-aarch64test \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/tmp/lib/domain--1-aarch64test/.local/share \
+XDG_CACHE_HOME=/tmp/lib/domain--1-aarch64test/.cache \
+XDG_CONFIG_HOME=/tmp/lib/domain--1-aarch64test/.config \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-aarch64 \
+-name guest=aarch64test,debug-threads=on \
+-S \
+-object secret,id=masterKey0,format=raw,\
+file=/tmp/lib/domain--1-aarch64test/master-key.aes \
+-machine virt,accel=tcg,usb=off,dump-guest-core=off,gic-version=2,\
+memory-backend=mach-virt.ram \
+-cpu cortex-a15 \
+-m 1024 \
+-object memory-backend-ram,id=mach-virt.ram,size=1073741824 \
+-overcommit mem-lock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid 496d7ea8-9739-544b-4ebd-ef08be936e8b \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-no-acpi \
+-boot strict=on \
+-tpmdev emulator,id=tpm-tpm0,chardev=chrtpm \
+-chardev socket,id=chrtpm,path=/dev/test \
+-device tpm-tis-device,tpmdev=tpm-tpm0,id=tpm0 \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,\
+resourcecontrol=deny \
+-msg timestamp=on

tests/qemuxml2argvdata/aarch64-tpm.xml

@@ -0,0 +1,15 @@
+<domain type="qemu">
+  <name>aarch64test</name>
+  <uuid>496d7ea8-9739-544b-4ebd-ef08be936e8b</uuid>
+  <memory>1048576</memory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch="aarch64" machine="virt">hvm</type>
+  </os>
+  <devices>
+    <emulator>/usr/bin/qemu-system-aarch64</emulator>
+    <tpm model='tpm-tis'>
+      <backend type='emulator' version='2.0'/>
+    </tpm>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -2478,6 +2478,7 @@ mymain(void)
     DO_TEST_CAPS_LATEST("tpm-emulator-tpm2-enc");
     DO_TEST_CAPS_LATEST("tpm-emulator-tpm2-pstate");
     DO_TEST_CAPS_LATEST_PPC64("tpm-emulator-spapr");
+    DO_TEST_CAPS_ARCH_LATEST("aarch64-tpm", "aarch64");
 
     DO_TEST_PARSE_ERROR("pci-domain-invalid", NONE);
     DO_TEST_PARSE_ERROR("pci-bus-invalid", NONE);