Re: [kvm-unit-tests PATCH v8 6/6] s390x: SCLP unit test

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On 20.01.20 19:42, Claudio Imbrenda wrote:
> SCLP unit test. Testing the following:
> 
> * Correctly ignoring instruction bits that should be ignored
> * Privileged instruction check
> * Check for addressing exceptions
> * Specification exceptions:
>   - SCCB size less than 8
>   - SCCB unaligned
>   - SCCB overlaps prefix or lowcore
>   - SCCB address higher than 2GB
> * Return codes for
>   - Invalid command
>   - SCCB too short (but at least 8)
>   - SCCB page boundary violation
> 
> Signed-off-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
> Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
> Acked-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
> ---
>  s390x/Makefile      |   1 +
>  s390x/sclp.c        | 474 ++++++++++++++++++++++++++++++++++++++++++++
>  s390x/unittests.cfg |   8 +
>  3 files changed, 483 insertions(+)
>  create mode 100644 s390x/sclp.c
> 
> diff --git a/s390x/Makefile b/s390x/Makefile
> index 3744372..ddb4b48 100644
> --- a/s390x/Makefile
> +++ b/s390x/Makefile
> @@ -16,6 +16,7 @@ tests += $(TEST_DIR)/diag288.elf
>  tests += $(TEST_DIR)/stsi.elf
>  tests += $(TEST_DIR)/skrf.elf
>  tests += $(TEST_DIR)/smp.elf
> +tests += $(TEST_DIR)/sclp.elf
>  tests_binary = $(patsubst %.elf,%.bin,$(tests))
>  
>  all: directories test_cases test_cases_binary
> diff --git a/s390x/sclp.c b/s390x/sclp.c
> new file mode 100644
> index 0000000..215347e
> --- /dev/null
> +++ b/s390x/sclp.c
> @@ -0,0 +1,474 @@
> +/*
> + * Service Call tests
> + *
> + * Copyright (c) 2019 IBM Corp
> + *
> + * Authors:
> + *  Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
> + *
> + * This code is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2.
> + */
> +
> +#include <libcflat.h>
> +#include <asm/page.h>
> +#include <asm/asm-offsets.h>
> +#include <asm/interrupt.h>
> +#include <sclp.h>
> +
> +#define PGM_NONE	1
> +#define PGM_BIT_SPEC	(1ULL << PGM_INT_CODE_SPECIFICATION)
> +#define PGM_BIT_ADDR	(1ULL << PGM_INT_CODE_ADDRESSING)
> +#define PGM_BIT_PRIV	(1ULL << PGM_INT_CODE_PRIVILEGED_OPERATION)
> +#define MKPTR(x) ((void *)(uint64_t)(x))
> +
> +#define LC_SIZE (2 * PAGE_SIZE)
> +
> +static uint8_t pagebuf[LC_SIZE] __attribute__((aligned(LC_SIZE)));	/* scratch pages used for some tests */
> +static uint8_t prefix_buf[LC_SIZE] __attribute__((aligned(LC_SIZE)));	/* temporary lowcore for test_sccb_prefix */
> +static uint8_t sccb_template[PAGE_SIZE];				/* SCCB template to be used */
> +static uint32_t valid_code;						/* valid command code for READ SCP INFO */
> +static struct lowcore *lc;
> +
> +/**
> + * Perform one service call, handling exceptions and interrupts.
> + */
> +static int sclp_service_call_test(unsigned int command, void *sccb)
> +{
> +	int cc;
> +
> +	sclp_mark_busy();
> +	sclp_setup_int();
> +	cc = servc(command, __pa(sccb));
> +	if (lc->pgm_int_code) {
> +		sclp_handle_ext();
> +		return 0;
> +	}
> +	if (!cc)
> +		sclp_wait_busy();
> +	return cc;
> +}
> +
> +/**
> + * Perform one test at the given address, optionally using the SCCB template,
> + * checking for the expected program interrupts and return codes.
> + *
> + * The parameter buf_len indicates the number of bytes of the template that
> + * should be copied to the test address, and should be 0 when the test
> + * address is invalid, in which case nothing is copied.
> + *
> + * The template is used to simplify tests where the same buffer content is
> + * used many times in a row, at different addresses.
> + *
> + * Returns true in case of success or false in case of failure
> + */
> +static bool test_one_sccb(uint32_t cmd, uint8_t *addr, uint16_t buf_len, uint64_t exp_pgm, uint16_t exp_rc)
> +{
> +	SCCBHeader *h = (SCCBHeader *)addr;
> +	int res, pgm;
> +
> +	/* Copy the template to the test address if needed */
> +	if (buf_len)
> +		memcpy(addr, sccb_template, buf_len);
> +	if (exp_pgm != PGM_NONE)
> +		expect_pgm_int();
> +	/* perform the actual call */
> +	res = sclp_service_call_test(cmd, h);
> +	if (res) {
> +		report_info("SCLP not ready (command %#x, address %p, cc %d)", cmd, addr, res);
> +		return false;
> +	}
> +	pgm = clear_pgm_int();
> +	/* Check if the program exception was one of the expected ones */
> +	if (!((1ULL << pgm) & exp_pgm)) {
> +		report_info("First failure at addr %p, buf_len %d, cmd %#x, pgm code %d",
> +				addr, buf_len, cmd, pgm);
> +		return false;
> +	}
> +	/* Check if the response code is the one expected */
> +	if (exp_rc && exp_rc != h->response_code) {
> +		report_info("First failure at addr %p, buf_len %d, cmd %#x, resp code %#x",
> +				addr, buf_len, cmd, h->response_code);
> +		return false;
> +	}
> +	return true;
> +}
> +
> +/**
> + * Wrapper for test_one_sccb to be used when the template should not be
> + * copied and the memory address should not be touched.
> + */
> +static bool test_one_ro(uint32_t cmd, uint8_t *addr, uint64_t exp_pgm, uint16_t exp_rc)
> +{
> +	return test_one_sccb(cmd, addr, 0, exp_pgm, exp_rc);
> +}
> +
> +/**
> + * Wrapper for test_one_sccb to set up a simple SCCB template.
> + *
> + * The parameter sccb_len indicates the value that will be saved in the SCCB
> + * length field of the SCCB, buf_len indicates the number of bytes of
> + * template that need to be copied to the actual test address. In many cases
> + * it's enough to clear/copy the first 8 bytes of the buffer, while the SCCB
> + * itself can be larger.
> + *
> + * Returns true in case of success or false in case of failure
> + */
> +static bool test_one_simple(uint32_t cmd, uint8_t *addr, uint16_t sccb_len,
> +			uint16_t buf_len, uint64_t exp_pgm, uint16_t exp_rc)
> +{
> +	memset(sccb_template, 0, sizeof(sccb_template));
> +	((SCCBHeader *)sccb_template)->length = sccb_len;
> +	return test_one_sccb(cmd, addr, buf_len, exp_pgm, exp_rc);

Doing a fresh ./configure + make on RHEL7 gives me

[linux1@rhkvm01 kvm-unit-tests]$ make
gcc  -std=gnu99 -ffreestanding -I /home/linux1/git/kvm-unit-tests/lib -I /home/linux1/git/kvm-unit-tests/lib/s390x -I lib -O2 -march=zEC12 -fno-delete-null-pointer-checks -g -MMD -MF s390x/.sclp.d -Wall -Wwrite-strings -Wempty-body -Wuninitialized -Wignored-qualifiers -Werror  -fomit-frame-pointer    -Wno-frame-address   -fno-pic    -Wclobbered  -Wunused-but-set-parameter  -Wmissing-parameter-type  -Wold-style-declaration -Woverride-init -Wmissing-prototypes -Wstrict-prototypes   -c -o s390x/sclp.o s390x/sclp.c
s390x/sclp.c: In function 'test_one_simple':
s390x/sclp.c:121:2: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
  ((SCCBHeader *)sccb_template)->length = sccb_len;
  ^
s390x/sclp.c: At top level:
cc1: error: unrecognized command line option "-Wno-frame-address" [-Werror]
cc1: all warnings being treated as errors
make: *** [s390x/sclp.o] Error 1



-- 
Thanks,

David / dhildenb




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