Commit c0306d2b8f for qemu.org

commit c0306d2b8f45a708f7ab45c846bb24851d6e17f2
Author: Thomas Huth <thuth@redhat.com>
Date:   Tue Apr 21 10:29:35 2026 +0200

    hw/misc: Fix the valid access size to the avr-power device

    Accessing the device with in non-single byte mode currently causes
    QEMU to abort:

     $ echo "writew 0x800064 0x4142" | \
       ./qemu-system-avr -M mega2560 -display none -qtest stdio -accel qtest
     [I 0.000000] OPENED
     [R +0.001784] writew 0x800064 0x4142
     qemu-system-avr: ../../devel/qemu/hw/misc/avr_power.c:58: avr_mask_write:
      Assertion `offset == 0' failed.
     Aborted                    (core dumped)

    Set the valid max access size to 1 to fix the problem.

    Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/3393
    Signed-off-by: Thomas Huth <thuth@redhat.com>
    Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
    Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
    Message-ID: <20260421082935.85995-1-thuth@redhat.com>
    Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

diff --git a/hw/misc/avr_power.c b/hw/misc/avr_power.c
index f42cf4fd90..42be265691 100644
--- a/hw/misc/avr_power.c
+++ b/hw/misc/avr_power.c
@@ -73,6 +73,9 @@ static const MemoryRegionOps avr_mask_ops = {
     .impl = {
         .max_access_size = 1,
     },
+    .valid = {
+        .max_access_size = 1,
+    },
 };

 static void avr_mask_init(Object *dev)