Re: [Qemu-devel] [PATCH 02/10] cuda: don't allow writes to port output pins

[Laurent Vivier]

On 03/02/2018 11:37, Mark Cave-Ayland wrote:
> Use the direction registers as a mask to ensure that only input pins are
> updated upon write.
> 
> Signed-off-by: Mark Cave-Ayland <address@hidden>
> ---
>  hw/misc/macio/cuda.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/misc/macio/cuda.c b/hw/misc/macio/cuda.c
> index 23b7e0f5b0..7214e7adcb 100644
> --- a/hw/misc/macio/cuda.c
> +++ b/hw/misc/macio/cuda.c
> @@ -359,11 +359,11 @@ static void cuda_write(void *opaque, hwaddr addr, 
> uint64_t val, unsigned size)
>  
>      switch(addr) {
>      case CUDA_REG_B:
> -        s->b = val;
> +        s->b = (s->b & ~s->dirb) | (val & s->dirb);
>          cuda_update(s);
>          break;
>      case CUDA_REG_A:
> -        s->a = val;
> +        s->a = (s->a & ~s->dira) | (val & s->dira);
>          break;
>      case CUDA_REG_DIRB:
>          s->dirb = val;
> 

Reviewed-by: Laurent Vivier <address@hidden>