[edk2-devel] Use a pcd to control PlatformRecovery

Wed Oct 16 07:42:27 UTC 2019

Thanks for checking this, Zhichao and Ray. 
I just sent a patch to fix it with the subject " [edk2-devel] [PATCH] MdeModulePkg/BdsDxe: Make PlatformRecovery work regardless of OsIndications"

Regards,
Sunny Wang

-----Original Message-----
From: devel at edk2.groups.io [mailto:devel at edk2.groups.io] On Behalf Of Gao, Zhichao
Sent: Wednesday, October 16, 2019 1:57 PM
To: Wang, Sunny (HPS SW) <sunnywang at hpe.com>; devel at edk2.groups.io; Ni, Ray <ray.ni at intel.com>
Cc: Wang, Jian J <jian.j.wang at intel.com>; Wu, Hao A <hao.a.wu at intel.com>; Zeng, Star <star.zeng at intel.com>; Gao, Liming <liming.gao at intel.com>; Sean Brogan <sean.brogan at microsoft.com>; Michael Turner <Michael.Turner at microsoft.com>; Bret Barkelew <Bret.Barkelew at microsoft.com>; Li, Walon <walon.li at hpe.com>; Wei, Kent (HPS SW) <kent.wei at hpe.com>
Subject: Re: [edk2-devel] Use a pcd to control PlatformRecovery
Importance: High

> -----Original Message-----
> From: Gao, Zhichao
> Sent: Wednesday, October 16, 2019 10:09 AM
> To: 'Wang, Sunny (HPS SW)' <sunnywang at hpe.com>; devel at edk2.groups.io; 
> Ni, Ray <ray.ni at intel.com>
> Cc: Wang, Jian J <jian.j.wang at intel.com>; Wu, Hao A 
> <hao.a.wu at intel.com>; Zeng, Star <star.zeng at intel.com>; Gao, Liming 
> <liming.gao at intel.com>; Sean Brogan <sean.brogan at microsoft.com>; 
> Michael Turner <Michael.Turner at microsoft.com>; Bret Barkelew 
> <Bret.Barkelew at microsoft.com>; Li, Walon <walon.li at hpe.com>; Wei, Kent 
> (HPS SW) <kent.wei at hpe.com>
> Subject: RE: Use a pcd to control PlatformRecovery
> 
> First of all, the patch didn't aim to change the other part of the 
> boot flow except PlatformRecovery.
> 
> Local variable PlatformRecovery is controlled by OsIndications 
> variable. When the EFI_OS_INDICATIONS_START_PLATFORM_RECOVERY is set, 
> the firmware should try to platform specific recovery. But that 
> doesn't mean the platform must support the specific recovery. i.e. 
> local PlatformRecovery is controlling the boot flow and the Pcd just 
> indicated whether the platform support recovery or not.
> So, on my opinion, I don't agree with your change.

After discuss with Sunny and Ray, and refer to the spec section 3.4.1 and 3.4.2, the OsRecovery and PlatformRecovery should always be operated regardless of the value of OsIndication variable if fail to boot the BootOrder. I am wrong. We should change to use the PcdPlatformRecoverySupport to control the PlatformRecovery. Please help to send a patch to fix it. Thanks a lot.

> 
> Default Platform Recovery refer to the short file path to boot the OS. 
> If the firmware supports platform recovery, then *short file path* 
> option would be one part of the PlatformRecovery#### in case there are 
> no other boot options. If the firmware doesn't support platform 
> recovery, we still need this default boot thru a short file path and 
> it should not depend on the PlatformRecovery#### variable for the compatibility thinking.
> 
> Thanks,
> Zhichao
> 
> > -----Original Message-----
> > From: Wang, Sunny (HPS SW) [mailto:sunnywang at hpe.com]
> > Sent: Tuesday, October 15, 2019 4:53 PM
> > To: devel at edk2.groups.io; Gao, Zhichao <zhichao.gao at intel.com>; Ni, 
> > Ray <ray.ni at intel.com>
> > Cc: Wang, Jian J <jian.j.wang at intel.com>; Wu, Hao A 
> > <hao.a.wu at intel.com>; Zeng, Star <star.zeng at intel.com>; Gao, Liming 
> > <liming.gao at intel.com>; Sean Brogan <sean.brogan at microsoft.com>; 
> > Michael Turner <Michael.Turner at microsoft.com>; Bret Barkelew 
> > <Bret.Barkelew at microsoft.com>; Li, Walon <walon.li at hpe.com>; Wei,
> Kent
> > (HPS SW) <kent.wei at hpe.com>; Wang, Sunny (HPS SW)
> <sunnywang at hpe.com>
> > Subject: Use a pcd to control PlatformRecovery
> >
> > Hi Zhichao and Ray,
> >
> > I have some questions about this code change. Sorry for being late 
> > to bring my questions here.
> >
> > For now, the code block for iterating the PlatformRecovery#### 
> > variables is controlled by OsIndications variable. However, it looks 
> > to me like that the PlatformRecovery#### should still be attempted 
> > for the case of that processing of BootOrder does NOT result in 
> > success (according to section 3.4 in UEFI 2.8). In other words, I 
> > think we should check PCD "PcdPlatformRecoverySupport" instead of 
> > Local variable
> "PlatformRecovery"
> > (from OsIndications variable) like the code below. What do you guys 
> > think? If you need a meeting or short talk to discuss this, feel 
> > free to let me
> know.
> >
> >   if (!BootSuccess) {
> > -   if (PlatformRecovery) {
> > +  if (PcdGetBool (PcdPlatformRecoverySupport)) {
> >       LoadOptions = EfiBootManagerGetLoadOptions (&LoadOptionCount, 
> > LoadOptionTypePlatformRecovery);
> >       ProcessLoadOptions (LoadOptions, LoadOptionCount);
> >       EfiBootManagerFreeLoadOptions (LoadOptions, LoadOptionCount);
> >     } else {
> >       //
> >       // When platform recovery is not enabled, still boot to 
> > platform default file path.
> >       //
> >       EfiBootManagerProcessLoadOption (&PlatformDefaultBootOption);
> >     }
> >
> >
> > In addition, it looks like EDK2 don't have code to process 
> > OsRecovery#### variables. Do we need to create a Bug on TianoCore
> Bugzilla system?

OsRecovery#### doesn't have an implement yet, we should co-work with the OS vendor to define the operation. For now, there is no requirement.

> >
> > Moreover, I saw that both of you had a discussion about "Default 
> > PlatformRecovery", but I can't figure out the connection between the 
> > discussion and the final code change. Isn't the "Default PlatformRecovery"
> > part of the Platform Recovery feature? At this moment, we don't have 
> > OS recovery support, so I think that NO platform recovery support 
> > can be identified as NO boot option recovery support. For this case, 
> > shouldn't we use PCD "PcdPlatformRecoverySupport" to control 
> > "Default PlatformRecovery" as well? For the next step, I think we 
> > need to get further clarification from USWG to either not tie 
> > "Default Boot Behavior" with PlatformRecovery or update the 
> > description to the
> following:
> >     - If system firmware supports Platform recovery as described in 
> > Section 3.4.2, system firmware must include a PlatformRecovery#### 
> > variable specifying a short-form File Path Media Device Path....

As I said above the 'Default Platform Recovery' refer to the short-form file path boot. When the PcdPlatformRecoverySupport is TRUE, it is part of PlatformRecovery. Ohterwise, it is not part of platform recovery and we still need to support it because of the capability issue. And that isn't conflict with the spec.

Thanks,
Zhichao

> >
> > Regards,
> > Sunny Wang
> >

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