On Wed, May 17, 2023 at 04:16:47PM +0100, Alex Bennée wrote:
>
> Ani Sinha <anisi...@redhat.com> writes:
>
> >> On 17-May-2023, at 8:06 PM, Michael S. Tsirkin <m...@redhat.com> wrote:
> >>
> >> On Wed, May 17, 2023 at 07:57:53PM +0530, Ani Sinha wrote:
> >>>
> >>>
> >>>> On 17-May-2023, at 7:47 PM, Michael S. Tsirkin <m...@redhat.com> wrote:
> >>>>
> >>>> On Wed, May 17, 2023 at 05:37:51PM +0530, Ani Sinha wrote:
> >>>>> Currently the meson based QEMU build process locates the iasl binary
> >>>>> from the
> >>>>> current PATH and other locations [1] and uses that to set CONFIG_IASL
> >>>>> which is
> >>>>> then used by the test.
> >>>>>
> >>>>> This has two disadvantages:
> >>>>> - If iasl was not previously installed in the PATH, one has to install
> >>>>> iasl
> >>>>> and rebuild QEMU in order to pick up the iasl location. One cannot
> >>>>> simply
> >>>>> use the existing bios-tables-test binary because CONFIG_IASL is only
> >>>>> set
> >>>>> during the QEMU build time by meson and then bios-tables-test has to be
> >>>>> rebuilt with CONFIG_IASL set in order to use iasl.
>
> Usually we work the other way by checking at configure time and skipping
> the feature if the prerequisites are not in place. We do this with gdb:
>
> ../../configure
> --gdb=/home/alex/src/tools/binutils-gdb.git/builds/all/install/bin/gdb
>
> which checks gdb is at least new enough to support the features we need:
>
> if test -n "$gdb_bin"; then
> gdb_version=$($gdb_bin --version | head -n 1)
> if version_ge ${gdb_version##* } 9.1; then
> echo "HAVE_GDB_BIN=$gdb_bin" >> $config_host_mak
> gdb_arches=$("$source_path/scripts/probe-gdb-support.py" $gdb_bin)
> else
> gdb_bin=""
> fi
> fi
>
> >>>>> - Sometimes, the stock iasl that comes with distributions is simply not
> >>>>> good
> >>>>> enough because it does not support the latest ACPI changes - newly
> >>>>> introduced tables or new table attributes etc. In order to test ACPI
> >>>>> code
> >>>>> in QEMU, one has to clone the latest acpica upstream repository and
> >>>>> rebuild iasl in order to get support for it. In those cases, one may
> >>>>> want
> >>>>> the test to use the iasl binary from a non-standard location.
>
> I think configure should be checking if iasl is new enough and reporting
> to the user at configure time they need to do something different. We
> don't want to attempt to run tests that will fail unless the user has
> added the right magic to their environment.
iasl is a disassembler we trigger for user convenience in case tests
fail. It will never cause tests to fail.
> >>>>>
> >>>>> In order to overcome the above two disadvantages, we introduce a new
> >>>>> environment variable IASL_PATH that can be set by the tester pointing
> >>>>> to an
> >>>>> possibly non-standard iasl binary location. Bios-tables-test then uses
> >>>>> this
> >>>>> environment variable to set its iasl location, possibly also overriding
> >>>>> the
> >>>>> location that was pointed to by CONFIG_IASL that was set by meson. This
> >>>>> way
> >>>>> developers can not only use this new environment variable to set iasl
> >>>>> location to quickly run bios-tables-test but also can point the test to
> >>>>> a
> >>>>> custom iasl if required.
> >>>>>
> >>>>> [1] https://mesonbuild.com/Reference-manual_functions.html#find_program
> >>>>>
> >>>>> Signed-off-by: Ani Sinha <anisi...@redhat.com>
> >>>>
> >>>> Well I think the point was originally that meson can
> >>>> also test the binary in a variety of ways.
> >>>> Never surfaced so maybe never mind.
> >>>>
> >>>> Would it be easier to just look iasl up on path
> >>>
> >>> But that’s what meson is also doing, only QEMU build time.
> >>
> >>
> >> So you were unhappy it's build time because it is not really
> >> part of build and you want flexibility, right?
> >
> > Hmm, maybe in that case, we might want to resurrect iasl_installed(),
> > basically reverting part of cc8fa0e80836c51ba644d910c.
> >
> > To me its ok if I had to set IASL_PATH=`which iasl` before running the
> > test. I do not have strong opinions.
>
> I don't think so - we should be using the tools configure found, after
> all that is its job.
>
> --
> Alex Bennée
> Virtualisation Tech Lead @ Linaro
Let's say the whole problem does not seem that important to me either.
--
MST
