Re: [kvm-unit-tests 1/2] s390x/smp: fix detection of "running"

[Janosch Frank <frankja@linux.ibm.com>]

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On 3/30/20 10:49 AM, Christian Borntraeger wrote:
> On s390x hosts with a single CPU, the smp test case hangs (loops).
> The check is our restart has finished is wrong.
> Sigp sense running status checks if the CPU is currently backed by a
> real CPU. This means that on single CPU hosts a sigp sense running
> will never claim that a target is running. We need to check for not
> being stopped instead.
> 
> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

Reviewed-by: Janosch Frank <frankja@linux.vnet.ibm.com>

> ---
>  lib/s390x/smp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/s390x/smp.c b/lib/s390x/smp.c
> index 2555bf4..5ed8b7b 100644
> --- a/lib/s390x/smp.c
> +++ b/lib/s390x/smp.c
> @@ -128,7 +128,7 @@ static int smp_cpu_restart_nolock(uint16_t addr, struct psw *psw)
>  	 * The order has been accepted, but the actual restart may not
>  	 * have been performed yet, so wait until the cpu is running.
>  	 */
> -	while (!smp_cpu_running(addr))
> +	while (smp_cpu_stopped(addr))
>  		mb();
>  	cpu->active = true;
>  	return 0;
> 



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