Register IOCSR MISC_FUNC_REG is to enable features about EXTIOI
irqchip. If EXTIOI is emulated in kernel, MISC_FUNC_REG register
should be emulated in kernel also.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 hw/loongarch/virt.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
index 1b504047db..69491fa31f 100644
--- a/hw/loongarch/virt.c
+++ b/hw/loongarch/virt.c
@@ -509,6 +509,10 @@ static MemTxResult virt_iocsr_misc_write(void *opaque, hwaddr addr,
 
     switch (addr) {
     case MISC_FUNC_REG:
+        if (kvm_irqchip_in_kernel()) {
+            return MEMTX_OK;
+        }
+
         if (!virt_is_veiointc_enabled(lvms)) {
             return MEMTX_OK;
         }
@@ -559,6 +563,10 @@ static MemTxResult virt_iocsr_misc_read(void *opaque, hwaddr addr,
         ret = 0x303030354133ULL;     /* "3A5000" */
         break;
     case MISC_FUNC_REG:
+        if (kvm_irqchip_in_kernel()) {
+            return MEMTX_OK;
+        }
+
         if (!virt_is_veiointc_enabled(lvms)) {
             ret |= BIT_ULL(IOCSRM_EXTIOI_EN);
             break;
-- 
2.39.3