Re: [PATCH kvm-unit-tests v1 1/4] s390x: user ctl_set/clear_bit for low address protection

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On 24.08.2018 13:50, David Hildenbrand wrote:
> User the provided helper functions now.
> 
> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>

s/User/Use/

Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxx>

> ---
>  lib/s390x/asm/interrupt.h | 12 ++----------
>  1 file changed, 2 insertions(+), 10 deletions(-)
> 
> diff --git a/lib/s390x/asm/interrupt.h b/lib/s390x/asm/interrupt.h
> index b3abd63..013709f 100644
> --- a/lib/s390x/asm/interrupt.h
> +++ b/lib/s390x/asm/interrupt.h
> @@ -23,21 +23,13 @@ void check_pgm_int_code(uint16_t code);
>  /* Activate low-address protection */
>  static inline void low_prot_enable(void)
>  {
> -	uint64_t cr0;
> -
> -	asm volatile (" stctg %%c0,%%c0,%0 " : : "Q"(cr0) : "memory");
> -	cr0 |= 1ULL << (63-35);
> -	asm volatile (" lctlg %%c0,%%c0,%0 " : : "Q"(cr0));
> +	ctl_set_bit(0, 63 - 35);
>  }
>  
>  /* Disable low-address protection */
>  static inline void low_prot_disable(void)
>  {
> -	uint64_t cr0;
> -
> -	asm volatile (" stctg %%c0,%%c0,%0 " : : "Q"(cr0) : "memory");
> -	cr0 &= ~(1ULL << (63-35));
> -	asm volatile (" lctlg %%c0,%%c0,%0 " : : "Q"(cr0));
> +	ctl_clear_bit(0, 63 - 35);
>  }
>  
>  #endif
> 


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