[PULL,24/28] rust/pl011: Fix range checks for device ID accesses

Commit Message

Alex Bennée Nov. 25, 2024, 3:21 p.m. UTC

From: Junjie Mao <[e-mail]>

The peripheral and PrimeCell identification registers of pl011 are located at
offset 0xFE0 - 0xFFC. To check if a read falls to such registers, the C
implementation checks if the offset-shifted-by-2 (not the offset itself) is in
the range 0x3F8 - 0x3FF.

Use the same check in the Rust implementation.

This fixes the timeout of the following avocado tests:

  * tests/avocado/boot_linux_console.py:BootLinuxConsole.test_arm_virt
  * tests/avocado/replay_kernel.py:ReplayKernelNormal.test_arm_virt
  * tests/avocado/replay_kernel.py:ReplayKernelNormal.test_arm_vexpressa9

Reported-by: Peter Maydell <[e-mail]>
Signed-off-by: Junjie Mao <[e-mail]>
Tested-by: Alex Bennée <[e-mail]>
Reviewed-by: Alex Bennée <[e-mail]>
Message-Id: <[e-mail]>
Signed-off-by: Alex Bennée <[e-mail]>
Message-Id: <[e-mail]>

Patch

diff --git a/rust/hw/char/pl011/src/device.rs b/rust/hw/char/pl011/src/device.rs
index 2a85960b81..476cacc844 100644
--- a/rust/hw/char/pl011/src/device.rs
+++ b/rust/hw/char/pl011/src/device.rs
@@ -182,7 +182,7 @@  pub fn read(&mut self, offset: hwaddr, _size: c_uint) -> std::ops::ControlFlow<u
         use RegisterOffset::*;
 
         std::ops::ControlFlow::Break(match RegisterOffset::try_from(offset) {
-            Err(v) if (0x3f8..0x400).contains(&v) => {
+            Err(v) if (0x3f8..0x400).contains(&(v >> 2)) => {
                 u64::from(self.device_id[(offset - 0xfe0) >> 2])
             }
             Err(_) => {