Re: [PATCH v2 1/3] vt82c686.c: don't raise SCI when PCI_INTERRUPT_PIN isn't setup

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

Hi Isaku,

On 3/23/21 6:24 PM, Isaku Yamahata wrote:
> Without this patch, the following patch will triger clan runtime
> sanitizer warnings as follows. This patch proactively works around it.
> I let v582c686.c maintainer address a correct fix as I'm not sure
> about fuloong2e device model.
> 
>> MALLOC_PERTURB_=${MALLOC_PERTURB_:-$(( ${RANDOM:-0} % 255 + 1))}
>> QTEST_QEMU_IMG=./qemu-img
>> G_TEST_DBUS_DAEMON=/home/petmay01/linaro/qemu-for-merges/tests/dbus-vmstate-daemon.sh
>> QTEST_QEMU_BINARY=./qemu-system-mips64el tests/qtest/qom-test --tap -k
>> PASS 1 qtest-mips64el/qom-test /mips64el/qom/loongson3-virt
>> PASS 2 qtest-mips64el/qom-test /mips64el/qom/none
>> PASS 3 qtest-mips64el/qom-test /mips64el/qom/magnum
>> PASS 4 qtest-mips64el/qom-test /mips64el/qom/mipssim
>> PASS 5 qtest-mips64el/qom-test /mips64el/qom/malta
>> ../../hw/pci/pci.c:252:30: runtime error: shift exponent -1 is negative
>> PASS 6 qtest-mips64el/qom-test /mips64el/qom/fuloong2e
>> PASS 7 qtest-mips64el/qom-test /mips64el/qom/boston
>> PASS 8 qtest-mips64el/qom-test /mips64el/qom/pica61
>>
>> and similarly for eg
>>
>> MALLOC_PERTURB_=${MALLOC_PERTURB_:-$(( ${RANDOM:-0} % 255 + 1))}
>> QTEST_QEMU_IMG=./qemu-img
>> G_TEST_DBUS_DAEMON=/home/petmay01/linaro/qemu-for-merges/tests/dbus-vmstate-daemon.sh
>> QTEST_QEMU_BINARY=./qemu-system-mips64el tests/qtest/endianness-test
>> --tap -k
>> ../../hw/pci/pci.c:252:30: runtime error: shift exponent -1 is negative
>> PASS 1 qtest-mips64el/endianness-test /mips64el/endianness/fuloong2e
>> ../../hw/pci/pci.c:252:30: runtime error: shift exponent -1 is negative
>> PASS 2 qtest-mips64el/endianness-test /mips64el/endianness/split/fuloong2e
>> ../../hw/pci/pci.c:252:30: runtime error: shift exponent -1 is negative
>> PASS 3 qtest-mips64el/endianness-test /mips64el/endianness/combine/fuloong2e
> 
> Cc: Huacai Chen <chenhuacai@kernel.org>
> Cc: "Philippe Mathieu-Daudé" <f4bug@amsat.org>
> Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
> Reported-by: Peter Maydell <Peter.maydel@linaro.org>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
> ---
>  hw/isa/vt82c686.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/isa/vt82c686.c b/hw/isa/vt82c686.c
> index 05d084f698..f0fb309f12 100644
> --- a/hw/isa/vt82c686.c
> +++ b/hw/isa/vt82c686.c
> @@ -144,7 +144,18 @@ static void pm_update_sci(ViaPMState *s)
>                     ACPI_BITMASK_POWER_BUTTON_ENABLE |
>                     ACPI_BITMASK_GLOBAL_LOCK_ENABLE |
>                     ACPI_BITMASK_TIMER_ENABLE)) != 0);
> -    pci_set_irq(&s->dev, sci_level);
> +    if (pci_get_byte(s->dev.config + PCI_INTERRUPT_PIN)) {
> +        /*
> +         * FIXME:
> +         * Fix device model that realizes this PM device and remove
> +         * this work around.
> +         * The device model should wire SCI and setup
> +         * PCI_INTERRUPT_PIN properly.
> +         * If PIN# = 0(interrupt pin isn't used), don't raise SCI as
> +         * work around.
> +         */
> +        pci_set_irq(&s->dev, sci_level);

I'll defer this to Zoltan.

Personally I wouldn't care about SCI_EN on the vt82c686, as
it is not used by x86 machines (IOW, I'd not modify via_pm_reset
and KISS).

> +    }
>      /* schedule a timer interruption if needed */
>      acpi_pm_tmr_update(&s->ar, (s->ar.pm1.evt.en & ACPI_BITMASK_TIMER_ENABLE) &&
>                         !(pmsts & ACPI_BITMASK_TIMER_STATUS));
>