Re: [kvm-unit-tests PATCH v3 4/5] s390x: uv-guest: add share bit test

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

On 2/22/22 15:54, Steffen Eiden wrote:
> The UV facility bits shared/unshared must both be set or none.
> 
> Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>

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

> ---
>   s390x/uv-guest.c | 14 ++++++++++++++
>   1 file changed, 14 insertions(+)
> 
> diff --git a/s390x/uv-guest.c b/s390x/uv-guest.c
> index 728c60aa..77057bd2 100644
> --- a/s390x/uv-guest.c
> +++ b/s390x/uv-guest.c
> @@ -159,6 +159,14 @@ static void test_invalid(void)
>   	report_prefix_pop();
>   }
>   
> +static void test_share_bits(void)
> +{
> +	bool unshare = uv_query_test_call(BIT_UVC_CMD_REMOVE_SHARED_ACCESS);
> +	bool share = uv_query_test_call(BIT_UVC_CMD_SET_SHARED_ACCESS);
> +
> +	report(!(share ^ unshare), "share bits");
> +}
> +
>   int main(void)
>   {
>   	bool has_uvc = test_facility(158);
> @@ -169,6 +177,12 @@ int main(void)
>   		goto done;
>   	}
>   
> +	/*
> +	 * Needs to be done before the guest-fence,
> +	 * as the fence tests if both shared bits are present
> +	 */
> +	test_share_bits();
> +
>   	if (!uv_os_is_guest()) {
>   		report_skip("Not a protected guest");
>   		goto done;