hw/i386/pc: Let pc_build_feature_control() take a FWCfgState argument

Pass the FWCfgState object by argument, this will
allow us to remove the PCMachineState argument later.
Suggested-by: NSamuel Ortiz <sameo@linux.intel.com>
Signed-off-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190818225414.22590-13-philmd@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/i386/pc.c

@@ -1623,7 +1623,8 @@ void pc_cpus_init(PCMachineState *pcms)
     }
 }
 
-static void pc_build_feature_control_file(PCMachineState *pcms)
+static void pc_build_feature_control_file(PCMachineState *pcms,
+                                          FWCfgState *fw_cfg)
 {
     MachineState *ms = MACHINE(pcms);
     X86CPU *cpu = X86_CPU(ms->possible_cpus->cpus[0].cpu);
@@ -1649,7 +1650,7 @@ static void pc_build_feature_control_file(PCMachineState *pcms)
 
     val = g_malloc(sizeof(*val));
     *val = cpu_to_le64(feature_control_bits | FEATURE_CONTROL_LOCKED);
-    fw_cfg_add_file(pcms->fw_cfg, "etc/msr_feature_control", val, sizeof(*val));
+    fw_cfg_add_file(fw_cfg, "etc/msr_feature_control", val, sizeof(*val));
 }
 
 static void rtc_set_cpus_count(ISADevice *rtc, uint16_t cpus_count)
@@ -1695,7 +1696,7 @@ void pc_machine_done(Notifier *notifier, void *data)
     acpi_setup();
     if (pcms->fw_cfg) {
         fw_cfg_build_smbios(MACHINE(pcms), pcms->fw_cfg);
-        pc_build_feature_control_file(pcms);
+        pc_build_feature_control_file(pcms, pcms->fw_cfg);
         /* update FW_CFG_NB_CPUS to account for -device added CPUs */
         fw_cfg_modify_i16(pcms->fw_cfg, FW_CFG_NB_CPUS, pcms->boot_cpus);
     }