Re: [kvm-unit-tests PATCH v3 5/9] lib: s390x: Add access key argument to tprot

[Thomas Huth <thuth@redhat.com>]

On 07/10/2021 10.50, Janosch Frank wrote:
> From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
> 
> Currently there is only one callee passing a non zero key,
> but having the argument will be useful in the future.
> 
> Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
> ---
>   lib/s390x/asm/arch_def.h | 6 +++---
>   lib/s390x/sclp.c         | 2 +-
>   s390x/skrf.c             | 3 +--
>   3 files changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/lib/s390x/asm/arch_def.h b/lib/s390x/asm/arch_def.h
> index c8d2722a..b34aa792 100644
> --- a/lib/s390x/asm/arch_def.h
> +++ b/lib/s390x/asm/arch_def.h
> @@ -233,15 +233,15 @@ static inline uint16_t get_machine_id(void)
>   	return cpuid;
>   }
>   
> -static inline int tprot(unsigned long addr)
> +static inline int tprot(unsigned long addr, char access_key)
>   {
>   	int cc;
>   
>   	asm volatile(
> -		"	tprot	0(%1),0\n"
> +		"	tprot	0(%1),0(%2)\n"
>   		"	ipm	%0\n"
>   		"	srl	%0,28\n"
> -		: "=d" (cc) : "a" (addr) : "cc");
> +		: "=d" (cc) : "a" (addr), "a" (access_key << 4) : "cc");
>   	return cc;
>   }
>   
> diff --git a/lib/s390x/sclp.c b/lib/s390x/sclp.c
> index 9502d161..02722498 100644
> --- a/lib/s390x/sclp.c
> +++ b/lib/s390x/sclp.c
> @@ -217,7 +217,7 @@ void sclp_memory_setup(void)
>   	/* probe for r/w memory up to max memory size */
>   	while (ram_size < max_ram_size) {
>   		expect_pgm_int();
> -		cc = tprot(ram_size + storage_increment_size - 1);
> +		cc = tprot(ram_size + storage_increment_size - 1, 0);
>   		/* stop once we receive an exception or have protected memory */
>   		if (clear_pgm_int() || cc != 0)
>   			break;
> diff --git a/s390x/skrf.c b/s390x/skrf.c
> index 8ca7588c..ca4efbf1 100644
> --- a/s390x/skrf.c
> +++ b/s390x/skrf.c
> @@ -103,8 +103,7 @@ static void test_tprot(void)
>   {
>   	report_prefix_push("tprot");
>   	expect_pgm_int();
> -	asm volatile("tprot	%[addr],0xf0(0)\n"
> -		     : : [addr] "a" (pagebuf) : );
> +	tprot((unsigned long)pagebuf, 0xf);
>   	check_pgm_int_code(PGM_INT_CODE_SPECIAL_OPERATION);
>   	report_prefix_pop();
>   }
> 

Reviewed-by: Thomas Huth <thuth@redhat.com>