[Qemu-devel] Re: [PATCH] A bit optimization for tlb_set_page() (resend)

[Jan Kiszka <jan.kiszka@web.de>]

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Jun Koi wrote:
> This patch avoids handling write watchpoints on read-only memory access.
> It also breaks the searching loop for watchpoint once the setup for
> handling watchpoint later is done.
> 
> Signed-off-by: Jun Koi <junkoi2004@gmail.com>
> 

Works fine.

Acked-by: Jan Kiszka <jan.kiszka@siemens.com>

> 
> diff --git a/exec.c b/exec.c
> index 14d1fd7..6fd859f 100644
> --- a/exec.c
> +++ b/exec.c
> @@ -2236,10 +2236,12 @@ void tlb_set_page(CPUState *env, target_ulong vaddr,
>         watchpoint trap routines.  */
>      QTAILQ_FOREACH(wp, &env->watchpoints, entry) {
>          if (vaddr == (wp->vaddr & TARGET_PAGE_MASK)) {
> -            iotlb = io_mem_watch + paddr;
> -            /* TODO: The memory case can be optimized by not trapping
> -               reads of pages with a write breakpoint.  */
> -            address |= TLB_MMIO;
> +            /* Avoid trapping reads of pages with a write breakpoint. */
> +            if ((prot & PAGE_WRITE) || (wp->flags & BP_MEM_READ)) {
> +                iotlb = io_mem_watch + paddr;
> +                address |= TLB_MMIO;
> +                break;
> +            }
>          }
>      }



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