Re: [kvm-unit-tests PATCH 2/3] s390x: skrf: Add exception new skey test and add test to unittests.cfg

[Claudio Imbrenda <imbrenda@linux.ibm.com>]

On Fri, 17 Jul 2020 10:58:12 -0400
Janosch Frank <frankja@linux.ibm.com> wrote:

> If a exception new psw mask contains a key a specification exception
> instead of a special operation exception is presented. Let's test
> that.
> 
> Also let's add the test to unittests.cfg so it is run more often.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> ---
>  s390x/skrf.c        | 81
> +++++++++++++++++++++++++++++++++++++++++++++ s390x/unittests.cfg |
> 4 +++ 2 files changed, 85 insertions(+)
> 
> diff --git a/s390x/skrf.c b/s390x/skrf.c
> index 9cae589..9733412 100644
> --- a/s390x/skrf.c
> +++ b/s390x/skrf.c
> @@ -15,6 +15,8 @@
>  #include <asm/page.h>
>  #include <asm/facility.h>
>  #include <asm/mem.h>
> +#include <asm/sigp.h>
> +#include <smp.h>
>  
>  static uint8_t pagebuf[PAGE_SIZE * 2]
> __attribute__((aligned(PAGE_SIZE * 2))); 
> @@ -106,6 +108,84 @@ static void test_tprot(void)
>  	report_prefix_pop();
>  }
>  
> +#include <asm-generic/barrier.h>
> +static int testflag = 0;
> +
> +static void wait_for_flag(void)
> +{
> +	while (!testflag)
> +		mb();
> +}
> +
> +static void set_flag(int val)
> +{
> +	mb();
> +	testflag = val;
> +	mb();
> +}
> +
> +static void ecall_cleanup(void)
> +{
> +	struct lowcore *lc = (void *)0x0;
> +
> +	lc->ext_new_psw.mask = 0x0000000180000000UL;
> +	lc->sw_int_crs[0] = 0x0000000000040000;
> +
> +	/*
> +	 * PGM old contains the ext new PSW, we need to clean it up,
> +	 * so we don't get a special oepration exception on the lpswe
> +	 * of pgm old.
> +	 */
> +	lc->pgm_old_psw.mask = 0x0000000180000000UL;
> +	lc->pgm_old_psw.addr = (unsigned long)wait_for_flag;
> +
> +	check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);
> +	set_flag(1);
> +}
> +
> +/* Set a key into the external new psw mask and open external call
> masks */ +static void ecall_setup(void)
> +{
> +	struct lowcore *lc = (void *)0x0;
> +	uint64_t mask;
> +
> +	register_pgm_int_func(ecall_cleanup);
> +	expect_pgm_int();
> +	/* Put a skey into the ext new psw */
> +	lc->ext_new_psw.mask = 0x00F0000180000000UL;
> +	/* Open up ext masks */
> +	ctl_set_bit(0, 13);
> +	mask = extract_psw_mask();
> +	mask |= PSW_MASK_EXT;
> +	load_psw_mask(mask);
> +	/* Tell cpu 0 that we're ready */
> +	set_flag(1);
> +}
> +
> +static void test_exception_ext_new(void)
> +{
> +	struct psw psw = {
> +		.mask = extract_psw_mask(),
> +		.addr = (unsigned long)ecall_setup
> +	};
> +
> +	report_prefix_push("exception external new");
> +	if (smp_query_num_cpus() < 2) {
> +		report_skip("Need second cpu for exception external
> new test.");
> +		report_prefix_pop();
> +		return;
> +	}
> +
> +	smp_cpu_setup(1, psw);
> +	wait_for_flag();
> +	set_flag(0);
> +
> +	sigp(1, SIGP_EXTERNAL_CALL, 0, NULL);
> +	wait_for_flag();
> +	smp_cpu_stop(1);
> +	report_prefix_pop();
> +}
> +
>  int main(void)
>  {
>  	report_prefix_push("skrf");
> @@ -121,6 +201,7 @@ int main(void)
>  	test_mvcos();
>  	test_spka();
>  	test_tprot();
> +	test_exception_ext_new();
>  
>  done:
>  	report_prefix_pop();
> diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg
> index 0f156af..b35269b 100644
> --- a/s390x/unittests.cfg
> +++ b/s390x/unittests.cfg
> @@ -88,3 +88,7 @@ extra_params = -m 3G
>  [css]
>  file = css.elf
>  extra_params = -device virtio-net-ccw
> +
> +[skrf]
> +file = skrf.elf
> +smp = 2

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>