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From: David Hildenbrand <david@redhat.com>
To: Claudio Imbrenda <imbrenda@linux.ibm.com>, kvm@vger.kernel.org
Cc: linux-s390@vger.kernel.org, thuth@redhat.com,
	borntraeger@de.ibm.com, frankja@linux.ibm.com
Subject: Re: [kvm-unit-tests PATCH v7 3/4] s390x: lib: add SPX and STPX instruction wrapper
Date: Mon, 13 Jan 2020 11:42:18 +0100
Message-ID: <81301db1-7fd1-c3ef-ded6-fd682fc24af9@redhat.com> (raw)
In-Reply-To: <20200110184050.191506-4-imbrenda@linux.ibm.com>

On 10.01.20 19:40, Claudio Imbrenda wrote:
> Add a wrapper for the SET PREFIX and STORE PREFIX instructions, and
> use it instead of using inline assembly.
> 
> Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
> ---
>  lib/s390x/asm/arch_def.h | 13 +++++++++++++
>  s390x/intercept.c        | 23 ++++++++---------------
>  2 files changed, 21 insertions(+), 15 deletions(-)
> 
> diff --git a/lib/s390x/asm/arch_def.h b/lib/s390x/asm/arch_def.h
> index 1a5e3c6..15a4d49 100644
> --- a/lib/s390x/asm/arch_def.h
> +++ b/lib/s390x/asm/arch_def.h
> @@ -284,4 +284,17 @@ static inline int servc(uint32_t command, unsigned long sccb)
>  	return cc;
>  }
>  
> +static inline void set_prefix(uint32_t new_prefix)
> +{
> +	asm volatile("	spx %0" : : "Q" (new_prefix) : "memory");
> +}
> +
> +static inline uint32_t get_prefix(void)
> +{
> +	uint32_t current_prefix;
> +
> +	asm volatile("	stpx %0" : "=Q" (current_prefix));
> +	return current_prefix;
> +}
> +
>  #endif
> diff --git a/s390x/intercept.c b/s390x/intercept.c
> index 3696e33..cd96121 100644
> --- a/s390x/intercept.c
> +++ b/s390x/intercept.c
> @@ -26,13 +26,10 @@ static void test_stpx(void)
>  	uint32_t new_prefix = (uint32_t)(intptr_t)pagebuf;
>  
>  	/* Can we successfully change the prefix? */
> -	asm volatile (
> -		" stpx	%0\n"
> -		" spx	%2\n"
> -		" stpx	%1\n"
> -		" spx	%0\n"
> -		: "+Q"(old_prefix), "+Q"(tst_prefix)
> -		: "Q"(new_prefix));
> +	old_prefix = get_prefix();
> +	set_prefix(new_prefix);
> +	tst_prefix = get_prefix();
> +	set_prefix(old_prefix);
>  	report(old_prefix == 0 && tst_prefix == new_prefix, "store prefix");
>  
>  	expect_pgm_int();
> @@ -63,14 +60,10 @@ static void test_spx(void)
>  	 * some facility bits there ... at least some of them should be
>  	 * set in our buffer afterwards.
>  	 */
> -	asm volatile (
> -		" stpx	%0\n"
> -		" spx	%1\n"
> -		" stfl	0\n"
> -		" spx	%0\n"
> -		: "+Q"(old_prefix)
> -		: "Q"(new_prefix)
> -		: "memory");
> +	old_prefix = get_prefix();
> +	set_prefix(new_prefix);
> +	asm volatile("	stfl 0" : : : "memory");
> +	set_prefix(old_prefix);
>  	report(pagebuf[GEN_LC_STFL] != 0, "stfl to new prefix");
>  
>  	expect_pgm_int();
> 

Besides the comments from Janosch, looks good to me.

-- 
Thanks,

David / dhildenb


  parent reply index

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-10 18:40 [kvm-unit-tests PATCH v7 0/4] s390x: SCLP Unit test Claudio Imbrenda
2020-01-10 18:40 ` [kvm-unit-tests PATCH v7 1/4] s390x: export sclp_setup_int Claudio Imbrenda
2020-01-10 18:40 ` [kvm-unit-tests PATCH v7 2/4] s390x: sclp: add service call instruction wrapper Claudio Imbrenda
2020-01-10 18:40 ` [kvm-unit-tests PATCH v7 3/4] s390x: lib: add SPX and STPX " Claudio Imbrenda
2020-01-13  9:42   ` Janosch Frank
2020-01-13 12:27     ` Claudio Imbrenda
2020-01-13 10:42   ` David Hildenbrand [this message]
2020-01-10 18:40 ` [kvm-unit-tests PATCH v7 4/4] s390x: SCLP unit test Claudio Imbrenda
2020-01-13 11:00   ` David Hildenbrand
2020-01-13 12:33     ` Claudio Imbrenda
2020-01-13 12:48       ` David Hildenbrand
2020-01-13 12:58         ` Claudio Imbrenda
2020-01-13 13:10           ` David Hildenbrand
2020-01-13 14:05             ` Claudio Imbrenda
2020-01-13 14:43               ` David Hildenbrand
2020-01-13 15:24                 ` Claudio Imbrenda
2020-01-13 16:06                   ` David Hildenbrand
2020-01-13 16:17                     ` Claudio Imbrenda
2020-01-15  9:57                       ` David Hildenbrand

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