Re: [Qemu-ppc] [Qemu-devel] [PATCH 0/5] nvram: Refactor OpenBIOS NVRAM code to support -prom-env on pseries, too

[David Gibson]

On Tue, Oct 25, 2016 at 02:22:08PM +0200, Thomas Huth wrote:
> On 24.10.2016 14:04, David Gibson wrote:
> > On Mon, Oct 24, 2016 at 12:36:05PM +0200, Thomas Huth wrote:
> >> On 24.10.2016 12:22, Bharata B Rao wrote:
> >>>
> >>> On Wed, Oct 19, 2016 at 7:46 AM, David Gibson
> >>> <address@hidden <mailto:address@hidden>> wrote:
> >>>
> >>>     On Tue, Oct 18, 2016 at 10:46:39PM +0200, Thomas Huth wrote:
> >>>     > The OpenBIOS NVRAM set-up is based on the layout defined in the CHRP
> >>>     > (Common Hardware Reference Platform) specification. This is the same
> >>>     > layout that is also used by the PAPR specification and thus by the
> >>>     SLOF
> >>>     > firmware of the pseries machine. By refactoring the NVRAM code from
> >>>     > mac_nvram.c, we can use the same functions for setting up the NVRAM
> >>>     > for both, OpenBIOS and SLOF. This way we can support the "-prom-env"
> >>>     > parameter of QEMU for SLOF, too, which is very useful to influence
> >>>     > the firmware boot process.
> >>>     >
> >>>     > Thomas Huth (5):
> >>>     >   nvram: Introduce helper functions for CHRP "system" and "free 
> >>> space"
> >>>     >     partitions
> >>>     >   sparc: Use the new common NVRAM functions for system and free 
> >>> space
> >>>     >     partition
> >>>     >   spapr_nvram: Pre-initialize the NVRAM to support the -prom-env
> >>>     >     parameter
> >>>     >   nvram: Move the remaining CHRP NVRAM related code to 
> >>> chrp_nvram.[ch]
> >>>     >   nvram: Rename openbios_firmware_abi.h into sun_nvram.h
> >>>     >
> >>>     >  hw/nvram/Makefile.objs                             |  1 +
> >>>     >  hw/nvram/chrp_nvram.c                              | 85
> >>>     ++++++++++++++++++++++
> >>>     >  hw/nvram/mac_nvram.c                               | 49 
> >>> +++----------
> >>>     >  hw/nvram/spapr_nvram.c                             |  6 ++
> >>>     >  hw/sparc/sun4m.c                                   | 35 ++-------
> >>>     >  hw/sparc64/sun4u.c                                 | 35 ++-------
> >>>     >  include/hw/nvram/chrp_nvram.h                      | 54
> >>>     ++++++++++++++
> >>>     >  .../nvram/{openbios_firmware_abi.h => sun_nvram.h} | 47 
> >>> +-----------
> >>>     >  tests/postcopy-test.c                              |  8 +-
> >>>     >  9 files changed, 179 insertions(+), 141 deletions(-)
> >>>     >  create mode 100644 hw/nvram/chrp_nvram.c
> >>>     >  create mode 100644 include/hw/nvram/chrp_nvram.h
> >>>     >  rename include/hw/nvram/{openbios_firmware_abi.h => sun_nvram.h}
> >>>     (50%)
> >>>
> >>>     Series,
> >>>
> >>>     Reviewed-by: David Gibson <address@hidden
> >>>     <mailto:address@hidden>>
> >>>
> >>>     I've put it into ppc-for-2.8 tentatively.  However I'd like to get an
> >>>     Acked-by from Mark for the Sparc bits before I send my next pull
> >>>     request.
> >>>
> >>>
> >>> I observe an early boot failure in SLOF with a commit from this patchset
> >>> on ppc-for-2.8 branch.
> >>>
> >>> 4e1257ed41bce16baa8a010 - spapr_nvram: Pre-initialize the NVRAM to
> >>> support the -prom-env parameter
> >>>
> >>> SLOF 
> >>> **********************************************************************
> >>> QEMU Starting
> >>>  Build Date = Oct 19 2016 09:58:38
> >>>  FW Version = git-efd65f49929d7db7
> >>>  Press "s" to enter Open Firmware.
> >>>
> >>> Populating /vdevice methods
> >>> Populating /vdevice/address@hidden
> >>> Populating /vdevice/address@hidden
> >>> Populating /vdevice/address@hidden
> >>>        SCSI: Looking for devices
> >>>           8200000000000000 CD-ROM   : "QEMU     QEMU CD-ROM      2.5+"
> >>> Populating /address@hidden
> >>>                      00 1000 (D) : 1033 0194    serial bus [ usb-xhci ]
> >>>                      00 0800 (D) : 1af4 1001    virtio [ block ]
> >>>                      00 0000 (D) : 1af4 1000    virtio [ net ]
> >>> Scanning USB
> >>>   XHCI: Initializing
> >>> Using default console: /vdevice/address@hidden
> >>>     
> >>>   Welcome to Open Firmware
> >>>
> >>>   Copyright (c) 2004, 2011 IBM Corporation All rights reserved.
> >>>   This program and the accompanying materials are made available
> >>>   under the terms of the BSD License available at
> >>>   http://www.opensource.org/licenses/bsd-license.php
> >>>
> >>>
> >>> Trying to load:  from: /address@hidden/address@hidden ...   Successfully 
> >>> loaded
> >>> error: out of memory.
> >>> out of memory
> >>> Aborted. Press any key to exit.
> >>
> >> Yuck. Confirmed. Sorry for the inconvenience. Seems like SLOF does not
> >> create the properties in the /options device tree node anymore in this 
> >> case.
> >>
> >> David, could you please unqueue the "spapr_nvram: Pre-initialize the
> >> NVRAM to support the -prom-env parameter" patch from the ppc-for-2.8
> >> branch until I figure out a fix for this problem? Thanks!
> > 
> > Done.
> 
> FYI, SLOF patch to fix this issue is on the way:
> https://patchwork.ozlabs.org/patch/686426/

Ok.  So it was a matter of this change exposing a bug in SLOF, rather
than being buggy of itself?

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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