diff --git a/include/qemu/seqlock.h b/include/qemu/seqlock.h
index fd408b7ec543029249e518c0666879d167eaab82..8b6b4ee4bbcf6a80fee192125afdff21a358a7c5 100644
--- a/include/qemu/seqlock.h
+++ b/include/qemu/seqlock.h
@@ -55,11 +55,11 @@ static inline void seqlock_write_lock_impl(QemuSeqLock *sl, QemuLockable *lock)
 #define seqlock_write_lock(sl, lock) \
     seqlock_write_lock_impl(sl, QEMU_MAKE_LOCKABLE(lock))
 
-/* Lock out other writers and update the count.  */
+/* Update the count and release the lock.  */
 static inline void seqlock_write_unlock_impl(QemuSeqLock *sl, QemuLockable *lock)
 {
+    seqlock_write_end(sl);
     qemu_lockable_unlock(lock);
-    seqlock_write_begin(sl);
 }
 #define seqlock_write_unlock(sl, lock) \
     seqlock_write_unlock_impl(sl, QEMU_MAKE_LOCKABLE(lock))
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index ec8bc9957eae8fb47e3e456948443ade40dcb216..1962f00c774290d9da198a1b5b7eb7bd06decfa4 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -6330,6 +6330,10 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
                        &cpu->mwait.ecx, &cpu->mwait.edx);
             env->features[FEAT_1_ECX] |= CPUID_EXT_MONITOR;
         }
+        if (kvm_enabled() && cpu->ucode_rev == 0) {
+            cpu->ucode_rev = kvm_arch_get_supported_msr_feature(kvm_state,
+                                                                MSR_IA32_UCODE_REV);
+        }
     }
 
     if (cpu->ucode_rev == 0) {
diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index 60060087fddec75abe865b1a159cc83c6a6cc32a..e49a2d2585a1b880f71d67a745cdadb77ada57e5 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -99,6 +99,7 @@ static bool has_msr_smi_count;
 static bool has_msr_arch_capabs;
 static bool has_msr_core_capabs;
 static bool has_msr_vmx_vmfunc;
+static bool has_msr_ucode_rev;
 static bool has_msr_vmx_procbased_ctls2;
 
 static uint32_t has_architectural_pmu_version;
@@ -1985,6 +1986,9 @@ static int kvm_get_supported_msrs(KVMState *s)
 		case MSR_IA32_VMX_VMFUNC:
                     has_msr_vmx_vmfunc = true;
                     break;
+                case MSR_IA32_UCODE_REV:
+                    has_msr_ucode_rev = true;
+                    break;
                 case MSR_IA32_VMX_PROCBASED_CTLS2:
                     has_msr_vmx_procbased_ctls2 = true;
                     break;
@@ -2628,6 +2632,10 @@ static void kvm_init_msrs(X86CPU *cpu)
                           env->features[FEAT_CORE_CAPABILITY]);
     }
 
+    if (has_msr_ucode_rev) {
+        kvm_msr_entry_add(cpu, MSR_IA32_UCODE_REV, cpu->ucode_rev);
+    }
+
     /*
      * Older kernels do not include VMX MSRs in KVM_GET_MSR_INDEX_LIST, but
      * all kernels with MSR features should have them.
diff --git a/vl.c b/vl.c
index b426b3213461210565bd1db15a0c89d71e9fea7c..cec0bfdb444c1b1e6b669ba8cdbfbfc8dc0c790c 100644
--- a/vl.c
+++ b/vl.c
@@ -3532,7 +3532,7 @@ int main(int argc, char **argv, char **envp)
                             gchar **optname = g_strsplit(typename,
                                                          ACCEL_CLASS_SUFFIX, 0);
                             printf("%s\n", optname[0]);
-                            g_free(optname);
+                            g_strfreev(optname);
                         }
                         g_free(typename);
                     }