[Qemu-devel] [PATCH v4 2/3] target-i386: add migration support for Intel LMCE

[Haozhong Zhang <haozhong.zhang@intel.com>]

Migration is only allowed between VCPUs with the same lmce option.

Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
---
 target-i386/machine.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/target-i386/machine.c b/target-i386/machine.c
index cb9adf2..00375a3 100644
--- a/target-i386/machine.c
+++ b/target-i386/machine.c
@@ -347,6 +347,12 @@ static int cpu_post_load(void *opaque, int version_id)
         return -EINVAL;
     }
 
+    if (!cpu->enable_lmce && (env->mcg_cap & MCG_LMCE_P)) {
+        error_report("Config mismatch: VCPU has LMCE enabled, "
+                     "but \"lmce\" option is disabled");
+        return -EINVAL;
+    }
+
     /*
      * Real mode guest segments register DPL should be zero.
      * Older KVM version were setting it wrongly.
@@ -896,6 +902,24 @@ static const VMStateDescription vmstate_tsc_khz = {
     }
 };
 
+static bool mcg_ext_ctl_needed(void *opaque)
+{
+    X86CPU *cpu = opaque;
+    CPUX86State *env = &cpu->env;
+    return cpu->enable_lmce && env->mcg_ext_ctl;
+}
+
+static const VMStateDescription vmstate_mcg_ext_ctl = {
+    .name = "cpu/mcg_ext_ctl",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = mcg_ext_ctl_needed,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT64(env.mcg_ext_ctl, X86CPU),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 VMStateDescription vmstate_x86_cpu = {
     .name = "cpu",
     .version_id = 12,
@@ -1022,6 +1046,7 @@ VMStateDescription vmstate_x86_cpu = {
 #ifdef TARGET_X86_64
         &vmstate_pkru,
 #endif
+        &vmstate_mcg_ext_ctl,
         NULL
     }
 };
-- 
2.9.0