Re: [edk2-devel] [PATCH v2 1/1] OvmfPkg:Add variable store is full debug info

["Oliver Steffen" <osteffen@redhat.com>]

Quoting Yao, Jiewen (2023-09-07 14:26:31)
> I don't think using ASSERT is a good idea here.
>

Some context:

We observed that EDK2 hits an ASSERT (Out of Resources) when booting
with a full variable store. The message provided in this case is not
helpful for non-experts.
I think the goal here is to emit a more user friendly message.

My suggestion is to wrap the newly added DEBUG statement with an if:

   if (OptionIndex == -1) {
     Status = EfiBootManagerAddLoadOptionVariable (&NewOption, MAX_UINTN);
+    if (Status == EFI_OUT_OF_RESOURCES) {
+      DEBUG ((DEBUG_ERROR, "ERROR: Variable store is full.\n"));
+    }
     ASSERT_EFI_ERROR (Status);
   }

The ASSERT_EFI_ERROR was already there. It will halt the execution in
case Status contains an error. Aparently the firmware is not able to
continue with a full variable store.

> Why not return ERROR?
>

This is in VOID PlatformRegisterFvBootOption (), returning ERROR is not
possible.

Thanks,
 Oliver

>
> > -----Original Message-----
> > From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Zhenyu
> > Zhang
> > Sent: Thursday, September 7, 2023 7:11 PM
> > To: devel@edk2.groups.io
> > Cc: zhenyzha@redhat.com; osteffen@redhat.com; kraxel@redhat.com;
> > marcandre.lureau@redhat.com; stefanb@linux.ibm.com;
> > anthony.perard@citrix.com; julien@xen.org
> > Subject: [edk2-devel] [PATCH v2 1/1] OvmfPkg:Add variable store is full debug
> > info
> >
> > From: "Zhenyu Zhang" <zhenyzha@redhat.com>
> >
> > When the variable store is full, edk2 will directly assert.
> > Add debug information to help users understand what caused
> > the assertion.
> >
> >  Actual results:
> >  RecordVarErrorFlag (0xEF) 9A144FE2A47E:937FE521-95AE-4D1A-8929-
> >  48BCD90AD31A - 0x00000003 - 0x7E
> >  CommonVariableSpace = 0x3FF9C - CommonVariableTotalSize =
> >  0x3FF98
> >  RecordVarErrorFlag (0xEF) 9A144FE2A47E:937FE521-95AE-4D1A-8929-
> >  48BCD90AD31A - 0x00000003 - 0x92
> >  CommonVariableSpace = 0x3FF9C - CommonVariableTotalSize = 0x3FF98
> >
> >  Synchronous Exception at 0x000000023CA60374
> >  ......
> >  ASSERT_EFI_ERROR (Status = Out of Resources)
> >  ASSERT /builddir/build/BUILD/edk2-ba91d0292e59/OvmfPkg/Library/
> >  PlatformBootManagerLib/BdsPlatform.c(142): !(((INTN)(RETURN_
> >  STATUS)(Status)) < 0)
> >
> > Cc: Oliver Steffen <osteffen@redhat.com>
> > Cc: Gerd Hoffmann <kraxel@redhat.com>
> > Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
> > Cc: Stefan Berger <stefanb@linux.ibm.com>
> > Cc: Anthony Perard <anthony.perard@citrix.com>
> > Cc: Julien Grall <julien@xen.org>
> > Signed-off-by: Zhenyu Zhang <zhenyzha@redhat.com>
> > ---
> >  OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
> > b/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
> > index 8dc2bbf97371..c95c7931a3f5 100644
> > --- a/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
> > +++ b/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
> > @@ -139,6 +139,7 @@ PlatformRegisterFvBootOption (
> >
> >    if (OptionIndex == -1) {
> >      Status = EfiBootManagerAddLoadOptionVariable (&NewOption, MAX_UINTN);
> > +    DEBUG ((DEBUG_ERROR, "ERROR: Variable store is full.\n"));
> >      ASSERT_EFI_ERROR (Status);
> >    }
> >
> > --
> > 2.39.3
> >



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