Re: [PATCH v2] target/arm: Avoid target_ulong for physical address lookups

[Peter Maydell]

On Fri, 27 Sept 2024 at 08:11, Ard Biesheuvel <ardb+git@google.com> wrote:
>
> From: Ard Biesheuvel <ardb@kernel.org>
>
> target_ulong is typedef'ed as a 32-bit integer when building the
> qemu-system-arm target, and this is smaller than the size of an
> intermediate physical address when LPAE is being used.
>
> Given that Linux may place leaf level user page tables in high memory
> when built for LPAE, the kernel will crash with an external abort as
> soon as it enters user space when running with more than ~3 GiB of
> system RAM.
>
> So replace target_ulong with vaddr in places where it may carry an
> address value that is not representable in 32 bits.
>
> Fixes: f3639a64f602ea ("target/arm: Use softmmu tlbs for page table walking")
> Reported-by: Arnd Bergmann <arnd@arndb.de>
> Tested-by: Arnd Bergmann <arnd@arndb.de>
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

Applied to target-arm.next, thanks (and tagged as for stable).

-- PMM