Re: [PATCH] accel/tcg: Add stub for probe_access()

[David Hildenbrand <david@redhat.com>]

On 23.04.20 09:10, Philippe Mathieu-Daudé wrote:
> The TCG helpers where added in b92e5a22ec3 in softmmu_template.h.
> probe_write() was added in there in 3b4afc9e75a to be moved out
> to accel/tcg/cputlb.c in 3b08f0a9254, and was later refactored
> as probe_access() in c25c283df0f.
> Since it is a TCG specific helper, add a stub to avoid failures
> when building without TCG, such:
> 
>   target/arm/helper.o: In function `probe_read':
>   include/exec/exec-all.h:345: undefined reference to `probe_access'

I think you're missing the most important commit:

0d57b4999220 ("target/arm: Add support for DC CVAP & DC CVADP ins")

I do wonder if dccvap_writefn() and calling code should be compiled for
TCG only (CONFIG_TCG). I assume it is only called from TCG code -
otherwise it would already be semi-broken.

> 
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
> Cc: Richard Henderson <rth@twiddle.net>
> Cc: Emilio G. Cota <cota@braap.org>
> Cc: Alex Bennée <alex.bennee@linaro.org>
> Cc: David Hildenbrand <david@redhat.com>
> ---
>  accel/stubs/tcg-stub.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/accel/stubs/tcg-stub.c b/accel/stubs/tcg-stub.c
> index 677191a69c..e4bbf997aa 100644
> --- a/accel/stubs/tcg-stub.c
> +++ b/accel/stubs/tcg-stub.c
> @@ -22,3 +22,10 @@ void tb_flush(CPUState *cpu)
>  void tlb_set_dirty(CPUState *cpu, target_ulong vaddr)
>  {
>  }
> +
> +void *probe_access(CPUArchState *env, target_ulong addr, int size,
> +                   MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
> +{
> +     /* Handled by hardware accelerator. */
> +     g_assert_not_reached();
> +}
> 

Still, this makes sense to me as well

Reviewed-by: David Hildenbrand <david@redhat.com>

-- 
Thanks,

David / dhildenb