>>> On 4/27/2017 at 10:08 AM, Igor Mammedov <imamm...@redhat.com> wrote:
> On Thu, 27 Apr 2017 09:44:31 -0600
> "Bruce Rogers" <brog...@suse.com> wrote:
>
>> >>> On 4/27/2017 at 03:11 AM, Igor Mammedov <imamm...@redhat.com> wrote:
>> > On Wed, 26 Apr 2017 13:07:02 -0600
>> > Bruce Rogers <brog...@suse.com> wrote:
>> >
>> >> Commit f0c9d64a exposed an issue with the code order in acpi_setup.
>> >> As of that commit, a xenfv machine type guest will no longer start
>> >> if using pci passthrough. Re-order the code in that function to
>> >> allow acpi_set_pci_info to be called before bailing on the other,
>> >> non-related conditions. With this change I can again use pci
>> >> passthrough and xenfv together.
>> >>
>> >> Signed-off-by: Bruce Rogers <brog...@suse.com>
>> > it doesn't look right,
>> > acpi_set_pci_info() is supposed to affect only ACPI based hotplug
>> >
>> > could you elaborate more on what's going on and
>> > what error you see at startup?
>>
>> I am using libvirt, driving the creation of the Xen HVM guest via
>> libxl. libxl dynamically attaches the pci device via QMP. In the
>> context of qmp_device_add(), we get a failure in hw/acpi/pcihp.c:
>> acpi_pcihp_device_plug_cb() when it checks for bsel, and errors
>> with the message: "Unsupported bus. Bus doesn't have property
>> 'acpi-pcihp-bsel' set". I guess it wasn't clear from my description
>> that hotplug was involved.
>>
> is dev->hotplugged in acpi_pcihp_device_plug_cb() true at that time?
>
> the point is that bsel is needed only when there is supporting ACPI code
> and useless otherwise, so acpi_pcihp_device_plug_cb() probably shouldn't
> run under xenfv. I'd try to add compat prop to PIIX4_PM and disable
> acpi_pcihp_device_plug_cb() for xenfv via machine compat property.
So what would be wrong with simply conditionalizing the call to
acpi_pcihp_device_plug_cb() with a check for xen in piix4_device_plug_cb()
as follows:
}
} else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
- acpi_pcihp_device_plug_cb(hotplug_dev, &s->acpi_pci_hotplug, dev,
errp);
+ if (!xen_enabled()) {
+ acpi_pcihp_device_plug_cb(hotplug_dev, &s->acpi_pci_hotplug, dev,
+ errp);
+ }
} else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
if (s->cpu_hotplug_legacy) {
legacy_acpi_cpu_plug_cb(hotplug_dev, &s->gpe_cpu, dev, errp);
Wouldn't that be the solution?
Bruce
