hw/loongarch: add virt feature dmsi support

dmsi feature is added in LoongArchVirtMachinState, and it is used
to check whether virt machine supports the directy Message-Interrupts.
and by default set dmsi with ON_OFF_AUTO_AUTO.
LoongArchVirtMachineState adds misc_feature and misc_status for misc
features and status. and set the default dintc feature bit.
Msgint feature is added in LoongArchCPU, and it is used to check
whether th cpu supports the Message-Interrupts and by default set
mesgint with ON_OFF_AUTO_AUTO.

Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Message-ID: <20250916122109.749813-3-gaosong@loongson.cn>

1 files changed, 14 insertions, 0 deletions

diff --git a/include/hw/loongarch/virt.h b/include/hw/loongarch/virt.h
index 7120b46714..98e9bf0737 100644
--- a/include/hw/loongarch/virt.h
+++ b/include/hw/loongarch/virt.h
@@ -23,6 +23,7 @@
 #define IOCSRF_DVFSV1           7
 #define IOCSRF_GMOD             9
 #define IOCSRF_VM               11
+#define IOCSRF_DMSI             15
 
 #define VERSION_REG             0x0
 #define FEATURE_REG             0x8
@@ -31,6 +32,7 @@
 #define MISC_FUNC_REG           0x420
 #define IOCSRM_EXTIOI_EN        48
 #define IOCSRM_EXTIOI_INT_ENCODE 49
+#define IOCSRM_DMSI_EN          51
 
 #define LOONGARCH_MAX_CPUS      256
 
@@ -69,6 +71,7 @@ struct LoongArchVirtMachineState {
     Notifier     powerdown_notifier;
     OnOffAuto    acpi;
     OnOffAuto    veiointc;
+    OnOffAuto    dmsi;
     char         *oem_id;
     char         *oem_table_id;
     DeviceState  *acpi_ged;
@@ -84,6 +87,8 @@ struct LoongArchVirtMachineState {
     DeviceState *extioi;
     struct memmap_entry *memmap_table;
     unsigned int memmap_entries;
+    uint64_t misc_feature;
+    uint64_t misc_status;
 };
 
 #define TYPE_LOONGARCH_VIRT_MACHINE  MACHINE_TYPE_NAME("virt")
@@ -91,6 +96,15 @@ OBJECT_DECLARE_SIMPLE_TYPE(LoongArchVirtMachineState, LOONGARCH_VIRT_MACHINE)
 void virt_acpi_setup(LoongArchVirtMachineState *lvms);
 void virt_fdt_setup(LoongArchVirtMachineState *lvms);
 
+static inline bool virt_has_dmsi(LoongArchVirtMachineState *lvms)
+{
+    if (!(lvms->misc_feature & BIT(IOCSRF_DMSI))) {
+        return false;
+    }
+
+    return true;
+}
+
 static inline bool virt_is_veiointc_enabled(LoongArchVirtMachineState *lvms)
 {
     if (lvms->veiointc == ON_OFF_AUTO_OFF) {