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Re: [PATCH] libxl: use b_info->{acpi,acpi} when available



On Fri, Sep 18, 2020 at 05:12:52PM +0200, Michal Prívozník wrote:
> On 9/18/20 1:31 PM, Daniel P. Berrangé wrote:
> > On Wed, Sep 16, 2020 at 11:09:31AM +0200, Michal Privoznik wrote:
> > > On 9/10/20 6:18 AM, Marek Marczykowski-Górecki wrote:
> > > > b_info->u.hvm.{acpi,apic} are deprecated. But also, on recent libxl
> > > > version (4.14) the old one seems to be broken. While libxl part should
> > > > be fixed too, update the usage here and at some point drop support for
> > > > the old version.
> > > > b_info->acpi was added in Xen 4.8
> > > > b_info->apic was added in Xen 4.10
> > > > Xen 4.10 is the oldest version that still has security support (until
> > > > December 2020).
> > > > 
> > > > Signed-off-by: Marek Marczykowski-Górecki <marmarek invisiblethingslab com>
> > > > ---
> > > >    src/libxl/libxl_conf.c                              | 13 +++++++++++++
> > > >    tests/libxlxml2domconfigdata/basic-hvm.json         |  4 ++--
> > > >    tests/libxlxml2domconfigdata/cpu-shares-hvm.json    |  4 ++--
> > > >    .../libxlxml2domconfigdata/fullvirt-acpi-slic.json  |  4 ++--
> > > >    .../fullvirt-cpuid-legacy-nest.json                 |  4 ++--
> > > >    tests/libxlxml2domconfigdata/fullvirt-cpuid.json    |  4 ++--
> > > >    .../max-eventchannels-hvm.json                      |  4 ++--
> > > >    tests/libxlxml2domconfigdata/max-gntframes-hvm.json |  4 ++--
> > > >    tests/libxlxml2domconfigdata/moredevs-hvm.json      |  4 ++--
> > > >    .../libxlxml2domconfigdata/variable-clock-hvm.json  |  4 ++--
> > > >    .../vnuma-hvm-legacy-nest.json                      |  4 ++--
> > > >    tests/libxlxml2domconfigdata/vnuma-hvm.json         |  4 ++--
> > > >    12 files changed, 35 insertions(+), 22 deletions(-)
> > > 
> > > This looks good to me.
> > > 
> > > Reviewed-by: Michal Privoznik <mprivozn redhat com>
> > > 
> > > I'll wait a bit with pushing it though in case Jim wants to chime in.
> > 
> > This broke the build on Ubuntu 1804 due to tests failing
> > 
> > TEST: libxlxml2domconfigtest
> >        .!!!!.!!!!                               10  FAIL
> 
> Oh, Ubuntu 18.04 has libxen-dev-4.9.2 and I'm not sure about FreeBSD, but
> probably something old too. So we can't use xen 4.10 APIs even though it was
> released 3 years ago.
> 
> Unfortunately, we will have to support Ubuntu 18.04 for quite some time
> because 20.04 was released only a while ago and we have this two year
> transition period:
> 
> https://libvirt.org/platforms.html
> 
> Marek, are you okay with me reverting the patch?

Technically, the driver code itself should work on both versions (there
is an #ifdef for that). It's only an issue with tests, where we don't have
#ifdef inside json files...

One idea would be to duplicate those affected json files and pick the
right one based on the libxenlight version, but it doesn't sound nice...
Any alternative ideas?

If not, then indeed revert is the simplest solution.

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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