hw/intc/loongarch_pch: Set flexible memory access size with iomem region

The original iomem region only supports 4 bytes access size, set it ok
with 1/2/4/8 bytes. Also unaligned memory access is not supported.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20250507023754.1877445-4-maobibo@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>

1 files changed, 10 insertions, 3 deletions

diff --git a/hw/intc/loongarch_pch_pic.c b/hw/intc/loongarch_pch_pic.c
index 076b984d93..e9126a0c1f 100644
--- a/hw/intc/loongarch_pch_pic.c
+++ b/hw/intc/loongarch_pch_pic.c
@@ -262,12 +262,19 @@ static const MemoryRegionOps loongarch_pch_pic_ops = {
     .read = loongarch_pch_pic_read,
     .write = loongarch_pch_pic_write,
     .valid = {
-        .min_access_size = 4,
+        .min_access_size = 1,
         .max_access_size = 8,
+        /*
+         * PCH PIC device would not work correctly if the guest was doing
+         * unaligned access. This might not be a limitation on the real
+         * device but in practice there is no reason for a guest to access
+         * this device unaligned.
+         */
+        .unaligned = false,
     },
     .impl = {
-        .min_access_size = 4,
-        .max_access_size = 4,
+        .min_access_size = 1,
+        .max_access_size = 8,
     },
     .endianness = DEVICE_LITTLE_ENDIAN,
 };