RE: [RFC] hw: nios2: update interrupt_request when STATUS_PIE disabled

[Wu, Wentong]

Hi @Thomas Huth,
It's my first time to send patch in qemu community, not sure if there is 
something wrong sending patch like below and I'm happy to receive any 
suggestions. And by the way, could you please help review the patch? 

Thanks

-----Original Message-----
From: Thomas Huth <thuth@redhat.com> 
Sent: Friday, June 5, 2020 3:07 PM
To: Wu, Wentong <wentong.wu@intel.com>; qemu-devel@nongnu.org
Cc: Chris Wulff <crwulff@gmail.com>; Marek Vasut <marex@denx.de>
Subject: Re: [RFC] hw: nios2: update interrupt_request when STATUS_PIE disabled

On 05/06/2020 07.59, Wu, Wentong wrote:
> Hi all,
> 
> I’m running icount mode on qemu_nios2 with customized  platform(almost 
> same with 10m50_devboard),
> 
> but cpu abort happened(qemu: fatal: Raised interrupt while not in I/O
> function) when guest code changes
> 
> state register with wrctl instruction, add some debug code finding 
> that it’s caused by the interrupt_request
> 
> mismatch, so I made a patch as below, not sure if it’s right, hope I 
> can have some discussion with maintainers

 Hi,

please have a look at the MAINTAINERS file in the main directory of the 
sources, you can find the corresponding maintainers there. Thus if you have 
questions related to nios2, please make sure to put Chris and Marek into CC: so 
that your patch gets the right attention!

 Thanks,
  Thomas



> commit efdb3da4e145a7a34ba8b3ab1cdcfc346ae20a11 (HEAD -> master)
> 
> Author: Wentong Wu <wentong.wu@intel.com>
> 
> Date:   Fri Jun 5 09:29:43 2020 -0400
> 
>  
> 
>     hw: nios2: update interrupt_request when CR_STATUS_PIE disabled
> 
>  
> 
>     Update interrupt_request when external interupt pends for 
> STATUS_PIE
> 
>     disabled. Otherwise on icount enabled nios2 target there will be 
> cpu
> 
>     abort when guest code changes state register with wrctl instruction.
> 
>  
> 
>     Signed-off-by: Wentong Wu <wentong.wu@intel.com>
> 
>  
> 
> diff --git a/hw/nios2/cpu_pic.c b/hw/nios2/cpu_pic.c
> 
> index 1c1989d5..b04db4d7 100644
> 
> --- a/hw/nios2/cpu_pic.c
> 
> +++ b/hw/nios2/cpu_pic.c
> 
> @@ -42,7 +42,9 @@ static void nios2_pic_cpu_handler(void *opaque, int 
> irq, int level)
> 
>          } else if (!level) {
> 
>              env->irq_pending = 0;
> 
>              cpu_reset_interrupt(cs, type);
> 
> -        }
> 
> +        } else {
> 
> +            cs->interrupt_request |= type;
> 
> +       }
> 
>      } else {
> 
>          if (level) {
> 
>              cpu_interrupt(cs, type);
>