On 10/25/24 18:58, Pierrick Bouvier wrote:
When instrumenting memory accesses for plugin, we force memory accesses
to use the slow path for mmu [1]. This create a situation where we end
up calling ptw_setl_slow. This was fixed recently in [2] but the issue
still could appear out of plugins use case.
Since this function gets called during a cpu_exec, start_exclusive then
hangs. This exclusive section was introduced initially for security
reasons [3].
I suspect this code path was never triggered, because ptw_setl_slow
would always be called transitively from cpu_exec, resulting in a hang.
[1]https://gitlab.com/qemu-project/qemu/-/commit/6d03226b42247b68ab2f0b3663e0f624335a4055
[2]https://gitlab.com/qemu-project/qemu/-/commit/115ade42d50144c15b74368d32dc734ea277d853
[3]https://gitlab.com/qemu-project/qemu/-/issues/279
Fixes:https://gitlab.com/qemu-project/qemu/-/issues/2566
Signed-off-by: Pierrick Bouvier<pierrick.bouv...@linaro.org>
---
target/i386/tcg/sysemu/excp_helper.c | 5 +++++
1 file changed, 5 insertions(+)
Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
r~
