[Xen-devel] Commit 9e047b982452c633882b486682966c1d97097015 (piix4: add acpi pci hotplug support) seems to break Xen pci-passthrough

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Grmbll my fat fingers hit the send shortcut too soon by accident ..
let's try again ..

Hi Michael,

A git bisect turned out that commit 9e047b982452c633882b486682966c1d97097015 
breaks pci-passthrough on Xen.

commit 9e047b982452c633882b486682966c1d97097015
Author: Michael S. Tsirkin <mst@xxxxxxxxxx>
Date:   Mon Oct 14 18:01:20 2013 +0300

    piix4: add acpi pci hotplug support

    Add support for acpi pci hotplug using the
    new infrastructure.
    PIIX4 legacy interface is maintained as is for
    machine types 1.7 and older.

    Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>


The error is not very verbose :

libxl: error: libxl_qmp.c:287:qmp_handle_error_response: received an error 
message from QMP server: Device initialization failed.
libxl: error: libxl_qmp.c:287:qmp_handle_error_response: received an error 
message from QMP server: Device initialization failed.
libxl: error: libxl_qmp.c:287:qmp_handle_error_response: received an error 
message from QMP server: Device initialization failed.
libxl: error: libxl_qmp.c:287:qmp_handle_error_response: received an error 
message from QMP server: Device initialization failed.

So it seems there is an issue with preserving the legacy interface.

--
Sander


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