ich9, piix4: add property, smm-compat, to keep compatibility of SMM

The following patch will introduce incompatible behavior of SMM. Introduce a property to keep the old behavior for compatibility. To enable smm compat, use "-global ICH9-LPC.smm-compat=on" or "-global PIIX4_PM.smm-compat=on" Suggested-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com> Message-Id: <47254ae0b8c6cc6945422978b6b2af2d213ef891.1613615732.git.isaku.yamahata@intel.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com>
qemu · Feb 23, 2021 · 24cd04f · 24cd04f
1 parent 7995d9a
commit 24cd04f
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diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
@@ -74,6 +74,7 @@ struct PIIX4PMState {
     qemu_irq irq;
     qemu_irq smi_irq;
     int smm_enabled;
+    bool smm_compat;
     Notifier machine_ready;
     Notifier powerdown_notifier;
 
@@ -642,6 +643,7 @@ static Property piix4_pm_properties[] = {
                      use_acpi_root_pci_hotplug, true),
     DEFINE_PROP_BOOL("memory-hotplug-support", PIIX4PMState,
                      acpi_memory_hotplug.is_enabled, true),
+    DEFINE_PROP_BOOL("smm-compat", PIIX4PMState, smm_compat, false),
     DEFINE_PROP_END_OF_LIST(),
 };
 

diff --git a/hw/isa/lpc_ich9.c b/hw/isa/lpc_ich9.c
@@ -775,6 +775,7 @@ static const VMStateDescription vmstate_ich9_lpc = {
 
 static Property ich9_lpc_properties[] = {
     DEFINE_PROP_BOOL("noreboot", ICH9LPCState, pin_strap.spkr_hi, true),
+    DEFINE_PROP_BOOL("smm-compat", ICH9LPCState, pm.smm_compat, false),
     DEFINE_PROP_BIT64("x-smi-broadcast", ICH9LPCState, smi_host_features,
                       ICH9_LPC_SMI_F_BROADCAST_BIT, true),
     DEFINE_PROP_BIT64("x-smi-cpu-hotplug", ICH9LPCState, smi_host_features,

diff --git a/include/hw/acpi/ich9.h b/include/hw/acpi/ich9.h
@@ -59,6 +59,7 @@ typedef struct ICH9LPCPMRegs {
     uint8_t disable_s4;
     uint8_t s4_val;
     uint8_t smm_enabled;
+    bool smm_compat;
     bool enable_tco;
     TCOIORegs tco_regs;
 } ICH9LPCPMRegs;