Re: [Qemu-devel] [PATCH v3 08/16] boot-order-test: New; covering just PC for now

[Anthony Liguori <aliguori@us.ibm.com>]

Markus Armbruster <armbru@redhat.com> writes:

> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> ---
>  tests/Makefile          |  2 ++
>  tests/boot-order-test.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 70 insertions(+)
>  create mode 100644 tests/boot-order-test.c
>
> diff --git a/tests/Makefile b/tests/Makefile
> index c107489..394e029 100644
> --- a/tests/Makefile
> +++ b/tests/Makefile
> @@ -54,6 +54,7 @@ gcov-files-i386-y = hw/fdc.c
>  check-qtest-i386-y += tests/ide-test$(EXESUF)
>  check-qtest-i386-y += tests/hd-geo-test$(EXESUF)
>  gcov-files-i386-y += hw/hd-geometry.c
> +check-qtest-i386-y += tests/boot-order-test$(EXESUF)
>  check-qtest-i386-y += tests/rtc-test$(EXESUF)
>  check-qtest-i386-y += tests/i440fx-test$(EXESUF)
>  check-qtest-i386-y += tests/fw_cfg-test$(EXESUF)
> @@ -130,6 +131,7 @@ tests/m48t59-test$(EXESUF): tests/m48t59-test.o
>  tests/fdc-test$(EXESUF): tests/fdc-test.o
>  tests/ide-test$(EXESUF): tests/ide-test.o $(libqos-pc-obj-y)
>  tests/hd-geo-test$(EXESUF): tests/hd-geo-test.o
> +tests/boot-order-test$(EXESUF): tests/boot-order-test.o
>  tests/tmp105-test$(EXESUF): tests/tmp105-test.o $(libqos-omap-obj-y)
>  tests/i440fx-test$(EXESUF): tests/i440fx-test.o $(libqos-pc-obj-y)
>  tests/fw_cfg-test$(EXESUF): tests/fw_cfg-test.o $(libqos-pc-obj-y)
> diff --git a/tests/boot-order-test.c b/tests/boot-order-test.c
> new file mode 100644
> index 0000000..2215710
> --- /dev/null
> +++ b/tests/boot-order-test.c
> @@ -0,0 +1,68 @@
> +/*
> + * Boot order test cases.
> + *
> + * Copyright (c) 2013 Red Hat Inc.
> + *
> + * Authors:
> + *  Markus Armbruster <armbru@redhat.com>,
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> + * See the COPYING file in the top-level directory.
> + */
> +
> +#include <glib.h>
> +#include "libqtest.h"
> +
> +static void test_pc_cmos_byte(int reg, int expected)
> +{
> +    int actual;
> +
> +    outb(0x70, reg);
> +    actual = inb(0x71);
> +    g_assert_cmphex(actual, ==, expected);
> +}
> +
> +static void test_pc_cmos(uint8_t boot1, uint8_t boot2)
> +{
> +    test_pc_cmos_byte(0x38, boot1);
> +    test_pc_cmos_byte(0x3d, boot2);
> +}
> +
> +static void test_pc_with_args(const char *test_args,
> +                              uint8_t boot1, uint8_t boot2,
> +                              uint8_t reboot1, uint8_t reboot2)
> +{
> +    char *args = g_strdup_printf("-nodefaults -display none %s", test_args);
> +
> +    qtest_start(args);
> +    test_pc_cmos(boot1, boot2);
> +    qmp("{ 'execute': 'system_reset' }");

I think this races.  I'd suggest doing a tight loop of this test and
running it a few thousand times to see if you can catch it.

qmp_system_reset() calls qemu_system_reset_requested() which stops all
CPUs but let's control fall back to the main loop which actually does
the device reset.

I think there's a tiny window where this command could return while the
reset routines have not been actually called yet.

Technically speaking, I think it's necessary to wait for a reset event
to know that the device model has been reset.

Regards,

Anthony Liguori

> +    test_pc_cmos(reboot1, reboot2);
> +    qtest_quit(global_qtest);
> +    g_free(args);
> +}
> +
> +static void test_pc_boot_order(void)
> +{
> +    test_pc_with_args("", 0x30, 0x12, 0x30, 0x12);
> +    test_pc_with_args("-no-fd-bootchk", 0x31, 0x12, 0x31, 0x12);
> +    test_pc_with_args("-boot c", 0, 0x02, 0, 0x02);
> +    test_pc_with_args("-boot nda", 0x10, 0x34, 0x10, 0x34);
> +    test_pc_with_args("-boot order=", 0, 0, 0, 0);
> +    test_pc_with_args("-boot order= -boot order=c", 0, 0x02, 0, 0x02);
> +    test_pc_with_args("-boot once=a", 0, 0x01, 0x30, 0x12);
> +    test_pc_with_args("-boot once=a -no-fd-bootchk", 0x01, 0x01, 0x31, 0x12);
> +    test_pc_with_args("-boot once=a,order=c", 0, 0x01, 0, 0x02);
> +    test_pc_with_args("-boot once=d -boot order=nda", 0, 0x03, 0x10, 0x34);
> +    test_pc_with_args("-boot once=a -boot once=b -boot once=c",
> +                      0, 0x02, 0x30, 0x12);
> +}
> +
> +int main(int argc, char *argv[])
> +{
> +    g_test_init(&argc, &argv, NULL);
> +
> +    qtest_add_func("boot-order/pc", test_pc_boot_order);
> +
> +    return g_test_run();
> +}
> -- 
> 1.7.11.7