[PATCH v4 18/23] i386/machine: Add vmstate for cet-shstk and cet-ibt

[Zhao Liu <zhao1.liu@intel.com>]

From: Yang Weijiang <weijiang.yang@intel.com>

Add vmstates for cet-shstk and cet-ibt

Tested-by: Farrah Chen <farrah.chen@intel.com>
Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
Co-developed-by: Chao Gao <chao.gao@intel.com>
Signed-off-by: Chao Gao <chao.gao@intel.com>
Co-developed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
---
Changes Since v3:
 - Rename vmstate_ss to vmstate_shstk.
 - Split pl0_ssp into a seperate vmstate in another patch.

Changes Since v2:
 - Split a subsection "vmstate_ss" since shstk is user-configurable.
---
 target/i386/machine.c | 52 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/target/i386/machine.c b/target/i386/machine.c
index 0a756573b6cd..265388f1fd36 100644
--- a/target/i386/machine.c
+++ b/target/i386/machine.c
@@ -1693,6 +1693,57 @@ static const VMStateDescription vmstate_pl0_ssp = {
     }
 };
 
+static bool shstk_needed(void *opaque)
+{
+    X86CPU *cpu = opaque;
+    CPUX86State *env = &cpu->env;
+
+    return !!(env->features[FEAT_7_0_ECX] & CPUID_7_0_ECX_CET_SHSTK);
+}
+
+static const VMStateDescription vmstate_shstk = {
+    .name = "cpu/cet_shstk",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = shstk_needed,
+    .fields = (VMStateField[]) {
+        /* pl0_ssp has been covered by vmstate_pl0_ssp. */
+        VMSTATE_UINT64(env.pl1_ssp, X86CPU),
+        VMSTATE_UINT64(env.pl2_ssp, X86CPU),
+        VMSTATE_UINT64(env.pl3_ssp, X86CPU),
+#ifdef TARGET_X86_64
+        VMSTATE_UINT64(env.int_ssp_table, X86CPU),
+#endif
+        VMSTATE_UINT64(env.guest_ssp, X86CPU),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static bool cet_needed(void *opaque)
+{
+    X86CPU *cpu = opaque;
+    CPUX86State *env = &cpu->env;
+
+    return !!((env->features[FEAT_7_0_ECX] & CPUID_7_0_ECX_CET_SHSTK) ||
+              (env->features[FEAT_7_0_EDX] & CPUID_7_0_EDX_CET_IBT));
+}
+
+static const VMStateDescription vmstate_cet = {
+    .name = "cpu/cet",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = cet_needed,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT64(env.u_cet, X86CPU),
+        VMSTATE_UINT64(env.s_cet, X86CPU),
+        VMSTATE_END_OF_LIST()
+    },
+    .subsections = (const VMStateDescription * const []) {
+        &vmstate_shstk,
+        NULL,
+    },
+};
+
 const VMStateDescription vmstate_x86_cpu = {
     .name = "cpu",
     .version_id = 12,
@@ -1843,6 +1894,7 @@ const VMStateDescription vmstate_x86_cpu = {
         &vmstate_arch_lbr,
         &vmstate_triple_fault,
         &vmstate_pl0_ssp,
+        &vmstate_cet,
         NULL
     }
 };
-- 
2.34.1