[TestDay] Xen-4.5.0 RC1 bug: with "xen_platform_pci=0" option, the guest with VT-d device fails to boot up

[TestDay] Xen-4.5.0 RC1 bug: with "xen_platform_pci=0" option, the guest with VT-d device fails to boot up

[Hu, Robert]

Best Regards,
Robert Ho

-----Original Message-----
From: bugzilla-daemon@bugzilla.xen.org [mailto:bugzilla-daemon@bugzilla.xen.org] 
Sent: Wednesday, November 12, 2014 9:24 AM
To: Hu, Robert
Subject: [Бъг 1893] Нов: with "xen_platform_pci=0" option, the guest with VT-d device fails to boot up

/bugzilla/show_bug.cgi?id=1893

           Summary: with "xen_platform_pci=0" option, the guest with VT-d
                    device fails to boot up
           Product: Xen
           Version: unstable
          Platform: x86-64
        OS/Version: Linux-2.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Hardware Support
        AssignedTo: xen-bugs@lists.xensource.com
        ReportedBy: songtaox.liu@intel.com
                CC: Robert.Hu@intel.com, longtaox.pang@intel.com,
                    di.zheng@intel.com
   Estimated Hours: 0.0


Environment:
------------
Service Arch (ia32/ia32e/IA64): ia32e
Guest Arch (ia32/ia32e/IA64): ia32e
Guest OS Type (Linux/Windows):ia32e_rhel6u6
Change Set: xen-4.5-rc1
Hardware: HSW-EP


Bug detailed description:
--------------------------
With "xen_platform_pci=0" option, the guest with VT-d device fails to boot up.
Without "xen_platform_pci=0" option, the guest with VT-d device boots up well.
the console shows the "Bus doesn't have property 'acpi-pcihp-bsel' set".


Reproduce steps:
----------------
1. boot up an ia32e_rhel6u6 guest with "xen_platform_pci=0   pci=['85:00.1']"
2. the guest fails to boot up

Current result:
----------------
guest with VT-d fails to boot up with "xen_platform_pci=0"

Expected result:
----------------
guest with VT-d boot up well with "xen_platform_pci=0"

Basic root-causing log:
----------------------
[root@vt-hsw1 carl]# xl cr xlexample.hvm 
Parsing config from xlexample.hvm
libxl: error: libxl_qmp.c:287:qmp_handle_error_response: received an error
message from QMP server: Unsupported bus. Bus doesn't have property
'acpi-pcihp-bsel' set
libxl: error: libxl_create.c:1385:domcreate_attach_pci: libxl_device_pci_add
failed: -3

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Re: [TestDay] Xen-4.5.0 RC1 bug: with "xen_platform_pci=0" option, the guest with VT-d device fails to boot up and qemu-xen

[Konrad Rzeszutek Wilk]

> Basic root-causing log:
> ----------------------
> [root@vt-hsw1 carl]# xl cr xlexample.hvm 
> Parsing config from xlexample.hvm
> libxl: error: libxl_qmp.c:287:qmp_handle_error_response: received an error
> message from QMP server: Unsupported bus. Bus doesn't have property
> 'acpi-pcihp-bsel' set
> libxl: error: libxl_create.c:1385:domcreate_attach_pci: libxl_device_pci_add
> failed: -3

I can reproduce this.

If you use "device_model_version = 'qemu-xen-traditional'" the problem
go aways and you can boot the guest without Xen PCI platform driver.