Re: [kvm-unit-tests PATCH v3 11/16] s390x: css: No support for MIDAW

[Cornelia Huck <cohuck@redhat.com>]

On Tue,  6 Apr 2021 09:40:48 +0200
Pierre Morel <pmorel@linux.ibm.com> wrote:

> Verify that using MIDAW triggers a operand exception.

This is only for current QEMU; a future QEMU or another hypervisor may
support it. I think in those cases the failure mode may be different
(as the ccw does not use midaws?)

> 
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
>  s390x/css.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/s390x/css.c b/s390x/css.c
> index f8f91cf..56adc16 100644
> --- a/s390x/css.c
> +++ b/s390x/css.c
> @@ -197,6 +197,18 @@ static void ssch_ccw_dma31(void)
>  	free_pages(ccw_high);
>  }
>  
> +static void ssch_orb_midaw(void)
> +{
> +	uint32_t tmp = orb->ctrl;
> +
> +	orb->ctrl |= ORB_CTRL_MIDAW;
> +	expect_pgm_int();
> +	ssch(test_device_sid, orb);
> +	check_pgm_int_code(PGM_INT_CODE_OPERAND);
> +
> +	orb->ctrl = tmp;
> +}
> +
>  static struct tests ssh_tests[] = {
>  	{ "privilege", ssch_privilege },
>  	{ "orb cpa zero", ssch_orb_cpa_zero },
> @@ -204,6 +216,7 @@ static struct tests ssh_tests[] = {
>  	{ "data access", ssch_data_access },
>  	{ "CCW access", ssch_ccw_access },
>  	{ "CCW in DMA31", ssch_ccw_dma31 },
> +	{ "ORB MIDAW unsupported", ssch_orb_midaw },
>  	{ NULL, NULL }
>  };
>