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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 4/4] s390x: SCLP unit test
Date: Mon, 13 Jan 2020 12:00:00 +0100
Message-ID: <8d7fb5c4-9e2c-e28a-16c0-658afcc8178d@redhat.com> (raw)
In-Reply-To: <20200110184050.191506-5-imbrenda@linux.ibm.com>

> +/**
> + * Test some bits in the instruction format that are specified to be ignored.
> + */
> +static void test_instbits(void)
> +{
> +	SCCBHeader *h = (SCCBHeader *)pagebuf;
> +	int cc;
> +
> +	expect_pgm_int();
> +	sclp_mark_busy();
> +	h->length = 8;
> +	sclp_setup_int();
> +
> +	asm volatile(
> +		"       .insn   rre,0xb2204200,%1,%2\n"  /* servc %1,%2 */
> +		"       ipm     %0\n"
> +		"       srl     %0,28"
> +		: "=&d" (cc) : "d" (valid_code), "a" (__pa(pagebuf))
> +		: "cc", "memory");
> +	if (lc->pgm_int_code) {
> +		sclp_handle_ext();
> +		cc = 1;
> +	} else if (!cc)
> +		

I wonder if something like the following would be possible:

expect_pgm_int();
...
asm volatiole();
...
sclp_wait_busy();
check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);

We would have to clear "sclp_busy" when we get a progam interrupt on a
servc instruction - shouldn't be too hard to add to the program
exception handler.

> +	report(cc == 0, "Instruction format ignored bits");
> +}
> +
> +/**
> + * Find a valid READ INFO command code; not all codes are always allowed, and
> + * probing should be performed in the right order.
> + */
> +static void find_valid_sclp_code(void)
> +{
> +	const unsigned int commands[] = { SCLP_CMDW_READ_SCP_INFO_FORCED,
> +					  SCLP_CMDW_READ_SCP_INFO };
> +	SCCBHeader *h = (SCCBHeader *)pagebuf;
> +	int i, cc;
> +
> +	for (i = 0; i < ARRAY_SIZE(commands); i++) {
> +		sclp_mark_busy();
> +		memset(h, 0, sizeof(*h));
> +		h->length = 4096;
> +
> +		valid_code = commands[i];
> +		cc = sclp_service_call(commands[i], h);
> +		if (cc)
> +			break;
> +		if (h->response_code == SCLP_RC_NORMAL_READ_COMPLETION)
> +			return;
> +		if (h->response_code != SCLP_RC_INVALID_SCLP_COMMAND)
> +			break;
> +	}
> +	valid_code = 0;

This can be dropped because ...

> +	report_abort("READ_SCP_INFO failed");

... you abort here.


-- 
Thanks,

David / dhildenb


  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
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 [this message]
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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