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.
> Bruce
>
> >
> >> ---
> >> hw/i386/acpi-build.c | 14 +++++++-------
> >> 1 file changed, 7 insertions(+), 7 deletions(-)
> >>
> >> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> >> index 2073108..1ec072f 100644
> >> --- a/hw/i386/acpi-build.c
> >> +++ b/hw/i386/acpi-build.c
> >> @@ -2834,6 +2834,13 @@ void acpi_setup(void)
> >> AcpiBuildState *build_state;
> >> Object *vmgenid_dev;
> >>
> >> + if (!acpi_enabled) {
> >> + ACPI_BUILD_DPRINTF("ACPI disabled. Bailing out.\n");
> >> + return;
> >> + }
> >> +
> >> + acpi_set_pci_info();
> >> +
> >> if (!pcms->fw_cfg) {
> >> ACPI_BUILD_DPRINTF("No fw cfg. Bailing out.\n");
> >> return;
> >> @@ -2844,15 +2851,8 @@ void acpi_setup(void)
> >> return;
> >> }
> >>
> >> - if (!acpi_enabled) {
> >> - ACPI_BUILD_DPRINTF("ACPI disabled. Bailing out.\n");
> >> - return;
> >> - }
> >> -
> >> build_state = g_malloc0(sizeof *build_state);
> >>
> >> - acpi_set_pci_info();
> >> -
> >> acpi_build_tables_init(&tables);
> >> acpi_build(&tables, MACHINE(pcms));
> >>
>
>
