diff --git a/src/cpu/cpu.c b/src/cpu/cpu.c
index c461c4839de12f00a6e40b2d49e9328376f0d0ec..631c7553914f4a8f7d7b0b8a3a9444b2ebabf3df 100644
--- a/src/cpu/cpu.c
+++ b/src/cpu/cpu.c
@@ -647,7 +647,8 @@ virCPUUpdateLive(virArch arch,
     if (!driver->updateLive)
         return 1;
 
-    if (cpu->mode == VIR_CPU_MODE_CUSTOM) {
+    if (cpu->mode == VIR_CPU_MODE_CUSTOM ||
+        cpu->check == VIR_CPU_CHECK_FULL) {
         if (driver->updateLive(cpu, dataEnabled, dataDisabled) < 0)
             return -1;
 
diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c
index 5a6b7bb1d8523be3376d78005b4a2cbe3f453ea7..7a8a2e3f3bd6e4e2ac6416888989bc83cf0717d1 100644
--- a/src/cpu/cpu_x86.c
+++ b/src/cpu/cpu_x86.c
@@ -3009,8 +3009,10 @@ virCPUx86UpdateLive(virCPUDefPtr cpu,
                     virCPUDataPtr dataEnabled,
                     virCPUDataPtr dataDisabled)
 {
+    bool hostPassthrough = cpu->mode == VIR_CPU_MODE_HOST_PASSTHROUGH;
     virCPUx86MapPtr map;
     virCPUx86ModelPtr model = NULL;
+    virCPUx86ModelPtr modelDisabled = NULL;
     virCPUx86Data enabled = VIR_CPU_X86_DATA_INIT;
     virCPUx86Data disabled = VIR_CPU_X86_DATA_INIT;
     virBuffer bufAdded = VIR_BUFFER_INITIALIZER;
@@ -3026,6 +3028,10 @@ virCPUx86UpdateLive(virCPUDefPtr cpu,
     if (!(model = x86ModelFromCPU(cpu, map, -1)))
         goto cleanup;
 
+    if (hostPassthrough &&
+        !(modelDisabled = x86ModelFromCPU(cpu, map, VIR_CPU_FEATURE_DISABLE)))
+        goto cleanup;
+
     if (dataEnabled &&
         x86DataCopy(&enabled, &dataEnabled->data.x86) < 0)
         goto cleanup;
@@ -3040,7 +3046,8 @@ virCPUx86UpdateLive(virCPUDefPtr cpu,
 
         if (x86DataIsSubset(&model->data, &feature->data))
             expected = VIR_CPU_FEATURE_REQUIRE;
-        else
+        else if (!hostPassthrough ||
+                 x86DataIsSubset(&modelDisabled->data, &feature->data))
             expected = VIR_CPU_FEATURE_DISABLE;
 
         if (expected == VIR_CPU_FEATURE_DISABLE &&
@@ -3101,6 +3108,7 @@ virCPUx86UpdateLive(virCPUDefPtr cpu,
 
  cleanup:
     x86ModelFree(model);
+    x86ModelFree(modelDisabled);
     virCPUx86DataClear(&enabled);
     virCPUx86DataClear(&disabled);
     VIR_FREE(added);