[PATCH v5 2/6] qemu: Add command-line to generate SGX EPC memory backend

[Haibin Huang <haibin.huang@xxxxxxxxx>]

From: Lin Yang <lin.a.yang@xxxxxxxxx>

According to the result parsing from xml, add the argument of
SGX EPC memory backend into QEMU command line:

    -object memory-backend-epc,id=mem1,size=<epc_size>K,prealloc \
    -sgx-epc id=epc1,memdev=mem1
---
 src/qemu/qemu_command.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 01812cd39b..3993f95988 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -9424,6 +9424,27 @@ qemuBuildSEVCommandLine(virDomainObjPtr vm, virCommandPtr cmd,
     return 0;
 }
 
+
+static int
+qemuBuildSGXCommandLine(virCommandPtr cmd, virDomainSGXDefPtr sgx)
+{
+    if (!sgx)
+        return 0;
+
+    VIR_DEBUG("sgx->epc_size=%lluKiB", sgx->epc_size);
+
+    virCommandAddArg(cmd, "-object");
+    virCommandAddArgFormat(cmd,
+                           "memory-backend-epc,id=mem1,size=%lluK,prealloc",
+                           sgx->epc_size);
+
+    virCommandAddArg(cmd, "-sgx-epc");
+    virCommandAddArg(cmd, "id=epc1,memdev=mem1");
+
+    return 0;
+}
+
+
 static int
 qemuBuildVMCoreInfoCommandLine(virCommandPtr cmd,
                                const virDomainDef *def)
@@ -10114,6 +10135,8 @@ qemuBuildCommandLine(virQEMUDriverPtr driver,
 
     if (qemuBuildSEVCommandLine(vm, cmd, def->sev) < 0)
         return NULL;
+    if (qemuBuildSGXCommandLine(cmd, def->sgx) < 0)
+        return NULL;
 
     if (snapshot)
         virCommandAddArgList(cmd, "-loadvm", snapshot->def->name, NULL);
-- 
2.17.1