[PATCH v3 7/9] qemu: build command line for the TPM Proxy device

[Daniel Henrique Barboza <danielhb413@xxxxxxxxx>]

This patch wraps it up all the wiring done in previous patches,
enabling a PPC64 guest to launch a guest using a TPM Proxy
device.

Note that device validation is already being done in qemu_validate.c,
qemuValidateDomainDeviceDefTPM(), on domain define time. We don't
need to verify QEMU capabilities for this device again inside
qemu_command.c.

Reviewed-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
Signed-off-by: Daniel Henrique Barboza <danielhb413@xxxxxxxxx>
---
 src/qemu/qemu_alias.c   | 16 ++++++++++++++++
 src/qemu/qemu_command.c | 21 +++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/src/qemu/qemu_alias.c b/src/qemu/qemu_alias.c
index b0ea62af39..08fe5aa501 100644
--- a/src/qemu/qemu_alias.c
+++ b/src/qemu/qemu_alias.c
@@ -413,6 +413,18 @@ qemuAssignDeviceTPMAlias(virDomainTPMDefPtr tpm,
 }
 
 
+static int
+qemuAssignDeviceTPMProxyAlias(virDomainTPMDefPtr tpmproxy,
+                              int idx)
+{
+    if (tpmproxy->info.alias)
+        return 0;
+
+    tpmproxy->info.alias = g_strdup_printf("tpmproxy%d", idx);
+    return 0;
+}
+
+
 int
 qemuAssignDeviceRedirdevAlias(virDomainDefPtr def,
                               virDomainRedirdevDefPtr redirdev,
@@ -673,6 +685,10 @@ qemuAssignDeviceAliases(virDomainDefPtr def, virQEMUCapsPtr qemuCaps)
         if (qemuAssignDeviceTPMAlias(def->tpm, 0) < 0)
             return -1;
     }
+    if (def->tpmproxy) {
+        if (qemuAssignDeviceTPMProxyAlias(def->tpmproxy, 0) < 0)
+            return -1;
+    }
     for (i = 0; i < def->nmems; i++) {
         if (qemuAssignDeviceMemoryAlias(NULL, def->mems[i], false) < 0)
             return -1;
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index bfe70ed228..0b97db7388 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -8981,6 +8981,24 @@ qemuBuildTPMCommandLine(virCommandPtr cmd,
     return 0;
 }
 
+static int
+qemuBuildTPMProxyCommandLine(virCommandPtr cmd,
+                             const virDomainDef *def)
+{
+    const virDomainTPMDef *tpmproxy = def->tpmproxy;
+
+    if (!tpmproxy)
+        return 0;
+
+    virCommandAddArg(cmd, "-device");
+    virCommandAddArgFormat(cmd, "%s,id=%s,host-path=%s",
+                           virDomainTPMModelTypeToString(tpmproxy->model),
+                           tpmproxy->info.alias,
+                           tpmproxy->data.passthrough.source.data.file.path);
+
+    return 0;
+}
+
 static int
 qemuBuildSEVCommandLine(virDomainObjPtr vm, virCommandPtr cmd,
                         virDomainSEVDefPtr sev)
@@ -9662,6 +9680,9 @@ qemuBuildCommandLine(virQEMUDriverPtr driver,
     if (qemuBuildTPMCommandLine(cmd, def, qemuCaps) < 0)
         return NULL;
 
+    if (qemuBuildTPMProxyCommandLine(cmd, def) < 0)
+        return NULL;
+
     if (qemuBuildInputCommandLine(cmd, def, qemuCaps) < 0)
         return NULL;
 
-- 
2.26.2