Re: Functionality issues in UDF support

["Yao, Jiewen" <jiewen.yao@intel.com>]

Hi Laszlo/Ruiyu/Star
I went through the whole conversation and have some thought:

For staging, I quote the description from https://github.com/tianocore/edk2-staging

I think UDF matches all below criteria. "edk2 required quality criteria" is the key.

We have lots of features there - such as StandaloneSmm, CustomizedSecureBoot, RiscV, ResetSystem, StructurePcd.

All those features need more validation.
We are following the rule and I think UDF feature can follow the same rule.

If there is quality concern and the quality concern cannot be resolved in a short period of time, the staging tree is a better choice.
(NOTE: "Fix it immediately" is not an alternative; we can't do that.)



========================================================
This repository is used by EDK II as a staging location for new
features that are not yet ready for inclusion in EDK II.

Introduction
=================
Need place on tianocore.org where new features that are not ready for product
integration can be checked in for evaluation by the EDK II community prior to
adding to the edk2 trunk.  This serves several purposes:

* Encourage source code to be shared earlier in the development process
* Allow source code to be shared that does not yet meet all edk2 required quality criteria
* Allow source code to be shared so the EDK II community can help finish and validate new features
* Provide a location to hold new features until they are deemed ready for product integration
* Provide a location to hold new features until there is a natural point in edk2 release cycle to fully validate the new feature.



From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Yao, Jiewen
Sent: Saturday, September 16, 2017 7:39 AM
To: Laszlo Ersek <lersek@redhat.com>; Ni, Ruiyu <ruiyu.ni@intel.com>; Paulo Alcantara <pcacjr@zytor.com>
Cc: Wu, Hao A <hao.a.wu@intel.com>; edk2-devel@lists.01.org; Zeng, Star <star.zeng@intel.com>
Subject: Re: [edk2] Functionality issues in UDF support

Hi Laszlo and Ruiyu
I can think 1 possible alternative, for your consideration only.

1)       Move the feature to OvmfPkg.

As such, it won't block us at this moment.

Once the UDF solution has good quality, we can move it back to MdeModulePkg.

Thank you
Yao Jiewen

From: Laszlo Ersek [mailto:lersek@redhat.com]
Sent: Saturday, September 16, 2017 12:51 AM
To: Ni, Ruiyu <ruiyu.ni@intel.com<mailto:ruiyu.ni@intel.com>>; Paulo Alcantara <pcacjr@zytor.com<mailto:pcacjr@zytor.com>>
Cc: Yao, Jiewen <jiewen.yao@intel.com<mailto:jiewen.yao@intel.com>>; Wu, Hao A <hao.a.wu@intel.com<mailto:hao.a.wu@intel.com>>; edk2-devel@lists.01.org<mailto:edk2-devel@lists.01.org>; Zeng, Star <star.zeng@intel.com<mailto:star.zeng@intel.com>>
Subject: Re: [edk2] Functionality issues in UDF support

On 09/15/17 18:40, Ni, Ruiyu wrote:
> Laszlo,
> Please do not add a PCD for this. Too many PCDs are no good to the project.

I understand that new MdeModulePkg PCDs are not liked, but what do you
propose instead? If we simply revert the PartitionDxe changes, then
people that want to experiment with general UDF support under OVMF won't
be able to do that at all.

I'm in the process of adding -D UDF_ENABLE to OvmfPkg, ArmVirtPkg, and
Nt32Pkg, which would control both the FeaturePCD and the inclusion of
UdfDxe in the build. If you disagree with the FeaturePCD, I can stop
working on this, but I don't know what the alternative is. "Fix it
immediately" is not an alternative; we can't do that. If you want to
revert the change, it's your prerogative, but that will prevent
everybody from testing gradual UDF improvements. (No 3rd parties build
OVMF from any staging branches, so if the feature is only available on a
staging branch, it might as well not exist, for the outside world.)

Thanks
Laszlo
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