[PULL,16/18] hw/misc: Set valid access size for Exynos4210 RNG

Commit Message

Peter Maydell June 22, 2024, 12:06 p.m. UTC

From: Zheyu Ma <[e-mail]>

The Exynos4210 RNG module requires 32-bit (4-byte) accesses to its registers.
According to the User Manual Section 25.3[1], the registers for RNG operations
are 32-bit. This change ensures that the memory region operations for the
RNG module enforce the correct access sizes, preventing invalid memory accesses.

[1] http://www.mediafire.com/view/8ly2fqls3c9c31c/Exynos_4412_SCP_Users_Manual_Ver.0.10.00_Preliminary0.pdf

Reproducer:
cat << EOF | qemu-system-aarch64 -display none \
-machine accel=qtest, -m 512M -machine smdkc210 -qtest stdio
readb 0x10830454
EOF

Suggested-by: Philippe Mathieu-Daudé <[e-mail]>
Signed-off-by: Zheyu Ma <[e-mail]>
Message-id: [e-mail]
Reviewed-by: Peter Maydell <[e-mail]>
Signed-off-by: Peter Maydell <[e-mail]>
---
 hw/misc/exynos4210_rng.c | 2 ++
 1 file changed, 2 insertions(+)

Patch

diff --git a/hw/misc/exynos4210_rng.c b/hw/misc/exynos4210_rng.c
index 0756bd32059..674d8eece5f 100644
--- a/hw/misc/exynos4210_rng.c
+++ b/hw/misc/exynos4210_rng.c
@@ -217,6 +217,8 @@  static const MemoryRegionOps exynos4210_rng_ops = {
     .read = exynos4210_rng_read,
     .write = exynos4210_rng_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
+    .valid.min_access_size = 4,
+    .valid.max_access_size = 4,
 };
 
 static void exynos4210_rng_reset(DeviceState *dev)