[RFC PATCH v4 02/36] i386: Introduce tdx-guest object

[Xiaoyao Li]

Introduce tdx-guest object which implements the interface of
CONFIDENTIAL_GUEST_SUPPORT, and will be used to create TDX VMs (TDs) by

  qemu -machine ...,confidential-guest-support=tdx0     \
       -object tdx-guset,id=tdx0

It has only one property 'attributes' with fixed value 0 and not
configurable so far.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
 configs/devices/i386-softmmu/default.mak |  1 +
 hw/i386/Kconfig                          |  5 +++
 qapi/qom.json                            | 14 +++++++++
 target/i386/kvm/meson.build              |  2 ++
 target/i386/kvm/tdx.c                    | 40 ++++++++++++++++++++++++
 target/i386/kvm/tdx.h                    | 19 +++++++++++
 6 files changed, 81 insertions(+)
 create mode 100644 target/i386/kvm/tdx.c
 create mode 100644 target/i386/kvm/tdx.h

diff --git a/configs/devices/i386-softmmu/default.mak 
b/configs/devices/i386-softmmu/default.mak
index 598c6646dfc0..9b5ec59d65b0 100644
--- a/configs/devices/i386-softmmu/default.mak
+++ b/configs/devices/i386-softmmu/default.mak
@@ -18,6 +18,7 @@
 #CONFIG_QXL=n
 #CONFIG_SEV=n
 #CONFIG_SGA=n
+#CONFIG_TDX=n
 #CONFIG_TEST_DEVICES=n
 #CONFIG_TPM_CRB=n
 #CONFIG_TPM_TIS_ISA=n
diff --git a/hw/i386/Kconfig b/hw/i386/Kconfig
index d22ac4a4b952..9e40ff79fc2d 100644
--- a/hw/i386/Kconfig
+++ b/hw/i386/Kconfig
@@ -10,6 +10,10 @@ config SGX
     bool
     depends on KVM
 
+config TDX
+    bool
+    depends on KVM
+
 config PC
     bool
     imply APPLESMC
@@ -26,6 +30,7 @@ config PC
     imply QXL
     imply SEV
     imply SGX
+    imply TDX
     imply SGA
     imply TEST_DEVICES
     imply TPM_CRB
diff --git a/qapi/qom.json b/qapi/qom.json
index eeb5395ff3b7..fde489e311dc 100644
--- a/qapi/qom.json
+++ b/qapi/qom.json
@@ -785,6 +785,18 @@
             'reduced-phys-bits': 'uint32',
             '*kernel-hashes': 'bool' } }
 
+##
+# @TdxGuestProperties:
+#
+# Properties for tdx-guest objects.
+#
+# @attributes: TDX guest's attributes (default: 0)
+#
+# Since: 7.1
+##
+{ 'struct': 'TdxGuestProperties',
+  'data': { '*attributes': 'uint64' } }
+
 ##
 # @ObjectType:
 #
@@ -837,6 +849,7 @@
       'if': 'CONFIG_SECRET_KEYRING' },
     'sev-guest',
     's390-pv-guest',
+    'tdx-guest',
     'throttle-group',
     'tls-creds-anon',
     'tls-creds-psk',
@@ -900,6 +913,7 @@
       'secret_keyring':             { 'type': 'SecretKeyringProperties',
                                       'if': 'CONFIG_SECRET_KEYRING' },
       'sev-guest':                  'SevGuestProperties',
+      'tdx-guest':                  'TdxGuestProperties',
       'throttle-group':             'ThrottleGroupProperties',
       'tls-creds-anon':             'TlsCredsAnonProperties',
       'tls-creds-psk':              'TlsCredsPskProperties',
diff --git a/target/i386/kvm/meson.build b/target/i386/kvm/meson.build
index 736df8b72e3f..b2d7d41acde2 100644
--- a/target/i386/kvm/meson.build
+++ b/target/i386/kvm/meson.build
@@ -9,6 +9,8 @@ i386_softmmu_kvm_ss.add(files(
 
 i386_softmmu_kvm_ss.add(when: 'CONFIG_SEV', if_false: files('sev-stub.c'))
 
+i386_softmmu_kvm_ss.add(when: 'CONFIG_TDX', if_true: files('tdx.c'))
+
 i386_softmmu_ss.add(when: 'CONFIG_HYPERV', if_true: files('hyperv.c'), 
if_false: files('hyperv-stub.c'))
 
 i386_softmmu_ss.add_all(when: 'CONFIG_KVM', if_true: i386_softmmu_kvm_ss)
diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
new file mode 100644
index 000000000000..d3792d4a3d56
--- /dev/null
+++ b/target/i386/kvm/tdx.c
@@ -0,0 +1,40 @@
+/*
+ * QEMU TDX support
+ *
+ * Copyright Intel
+ *
+ * Author:
+ *      Xiaoyao Li <xiaoyao.li@intel.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qom/object_interfaces.h"
+
+#include "tdx.h"
+
+/* tdx guest */
+OBJECT_DEFINE_TYPE_WITH_INTERFACES(TdxGuest,
+                                   tdx_guest,
+                                   TDX_GUEST,
+                                   CONFIDENTIAL_GUEST_SUPPORT,
+                                   { TYPE_USER_CREATABLE },
+                                   { NULL })
+
+static void tdx_guest_init(Object *obj)
+{
+    TdxGuest *tdx = TDX_GUEST(obj);
+
+    tdx->attributes = 0;
+}
+
+static void tdx_guest_finalize(Object *obj)
+{
+}
+
+static void tdx_guest_class_init(ObjectClass *oc, void *data)
+{
+}
diff --git a/target/i386/kvm/tdx.h b/target/i386/kvm/tdx.h
new file mode 100644
index 000000000000..415aeb5af746
--- /dev/null
+++ b/target/i386/kvm/tdx.h
@@ -0,0 +1,19 @@
+#ifndef QEMU_I386_TDX_H
+#define QEMU_I386_TDX_H
+
+#include "exec/confidential-guest-support.h"
+
+#define TYPE_TDX_GUEST "tdx-guest"
+#define TDX_GUEST(obj)  OBJECT_CHECK(TdxGuest, (obj), TYPE_TDX_GUEST)
+
+typedef struct TdxGuestClass {
+    ConfidentialGuestSupportClass parent_class;
+} TdxGuestClass;
+
+typedef struct TdxGuest {
+    ConfidentialGuestSupport parent_obj;
+
+    uint64_t attributes;    /* TD attributes */
+} TdxGuest;
+
+#endif /* QEMU_I386_TDX_H */
-- 
2.27.0