From: Bibo Mao <maobibo@loongson.cn>
Date: Fri, 6 Jun 2025 06:35:23 +0000 (+0800)
Subject: hw/loongarch/virt: Disable emulation with IOCSR misc register
X-Git-Tag: v10.1.0-rc0~47^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=17fb88a0fa0a13b0e2976a2fe04756337d95fe1f;p=thirdparty%2Fqemu.git

hw/loongarch/virt: Disable emulation with IOCSR misc register

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.

Reviewed-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Message-ID: <20250606063523.2557513-1-maobibo@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
---

diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
index 34dfbd13e5c..e5468b6af90 100644
--- a/hw/loongarch/virt.c
+++ b/hw/loongarch/virt.c
@@ -522,6 +522,10 @@ 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;
         }
@@ -572,6 +576,10 @@ 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;