OK. To keep the compatibility of existing MM driver. That makes sense. If it is for security, I think EndOfDxe is the only point. ReadyToBoot and ExitBootService cannot be used for security purpose.
Then do we need SmmReadyToLock ? :-) Thank you Yao Jiewen > -----Original Message----- > From: edk2-devel [mailto:edk2-devel-boun...@lists.01.org] On Behalf Of > Ard Biesheuvel > Sent: Tuesday, March 5, 2019 7:58 AM > To: Yao, Jiewen <jiewen....@intel.com> > Cc: edk2-devel@lists.01.org > Subject: Re: [edk2] [PATCH 10/10] ArmPkg/MmCommunicationDxe: signal > architected PI events into MM context > > On Tue, 5 Mar 2019 at 16:56, Yao, Jiewen <jiewen....@intel.com> wrote: > > > > Hi > > In original SMM infrastructure, there are lots of interaction that SMM has > to know the DXE status. > > > > In StandaloneMm, I don't expect we have many interaction. Is there any > specific example? > > > > I am totally OK to add those. And I just want to know more usage. > > > > Reviewed-by: jiewen....@intel.com > > > > Jiewen, > > Thanks for the review. > > It is not 100% clear at the moment, but since existing third party > software designed to run in MM context may make assumptions about > security of the platform (e.g., before vs after end of dxe) based on > these events, we should at least signal the common ones added in this > patch. > > > > > > > -----Original Message----- > > > From: Ard Biesheuvel [mailto:ard.biesheu...@linaro.org] > > > Sent: Tuesday, March 5, 2019 5:33 AM > > > To: edk2-devel@lists.01.org > > > Cc: Ard Biesheuvel <ard.biesheu...@linaro.org>; Achin Gupta > > > <achin.gu...@arm.com>; Supreeth Venkatesh > > > <supreeth.venkat...@arm.com>; Yao, Jiewen <jiewen....@intel.com>; > > > Leif Lindholm <leif.lindh...@linaro.org>; Jagadeesh Ujja > > > <jagadeesh.u...@arm.com> > > > Subject: [PATCH 10/10] ArmPkg/MmCommunicationDxe: signal > architected > > > PI events into MM context > > > > > > PI defines a few architected events that have significance in the MM > > > context as well as in the non-secure DXE context. So register notify > > > handlers for these events, and relay them into the standalone MM world. > > > > > > Contributed-under: TianoCore Contribution Agreement 1.1 > > > Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org> > > > --- > > > ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.inf | 5 > +++ > > > ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c | 47 > > > +++++++++++++++++++- > > > 2 files changed, 50 insertions(+), 2 deletions(-) > > > > > > diff --git > a/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.inf > > > b/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.inf > > > index 88beafa39c05..8bf269270f9d 100644 > > > --- a/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.inf > > > +++ b/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.inf > > > @@ -48,6 +48,11 @@ [LibraryClasses] > > > [Protocols] > > > gEfiMmCommunicationProtocolGuid ## PRODUCES > > > > > > +[Guids] > > > + gEfiEndOfDxeEventGroupGuid > > > + gEfiEventExitBootServicesGuid > > > + gEfiEventReadyToBootGuid > > > + > > > [Pcd.common] > > > gArmTokenSpaceGuid.PcdMmBufferBase > > > gArmTokenSpaceGuid.PcdMmBufferSize > > > diff --git > a/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c > > > b/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c > > > index feb9fa9f4ead..3203cf801a19 100644 > > > --- a/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c > > > +++ b/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c > > > @@ -265,6 +265,43 @@ GetMmCompatibility () > > > return Status; > > > } > > > > > > +STATIC EFI_GUID* CONST mGuidedEventGuid[] = { > > > + &gEfiEndOfDxeEventGroupGuid, > > > + &gEfiEventExitBootServicesGuid, > > > + &gEfiEventReadyToBootGuid, > > > +}; > > > + > > > +STATIC EFI_EVENT mGuidedEvent[ARRAY_SIZE (mGuidedEventGuid)]; > > > + > > > +/** > > > + Event notification that is fired when GUIDed Event Group is signaled. > > > + > > > + @param Event The Event that is being > processed, > > > not used. > > > + @param Context Event Context, not used. > > > + > > > +**/ > > > +STATIC > > > +VOID > > > +EFIAPI > > > +MmGuidedEventNotify ( > > > + IN EFI_EVENT Event, > > > + IN VOID *Context > > > + ) > > > +{ > > > + EFI_MM_COMMUNICATE_HEADER Header; > > > + UINTN Size; > > > + > > > + // > > > + // Use Guid to initialize EFI_SMM_COMMUNICATE_HEADER structure > > > + // > > > + CopyGuid (&Header.HeaderGuid, Context); > > > + Header.MessageLength = 1; > > > + Header.Data[0] = 0; > > > + > > > + Size = sizeof (Header); > > > + MmCommunicationCommunicate (&mMmCommunication, &Header, > > > &Size); > > > +} > > > + > > > /** > > > The Entry Point for MM Communication > > > > > > @@ -287,6 +324,7 @@ MmCommunicationInitialize ( > > > ) > > > { > > > EFI_STATUS Status; > > > + UINTN Index; > > > > > > // Check if we can make the MM call > > > Status = GetMmCompatibility (); > > > @@ -351,8 +389,13 @@ MmCommunicationInitialize ( > > > NULL, > > > &mSetVirtualAddressMapEvent > > > ); > > > - if (Status == EFI_SUCCESS) { > > > - return Status; > > > + ASSERT_EFI_ERROR (Status); > > > + > > > + for (Index = 0; Index < ARRAY_SIZE (mGuidedEventGuid); Index++) { > > > + Status = gBS->CreateEventEx (EVT_NOTIFY_SIGNAL, > TPL_CALLBACK, > > > + MmGuidedEventNotify, > mGuidedEventGuid[Index], > > > + mGuidedEventGuid[Index], > > > &mGuidedEvent[Index]); > > > + ASSERT_EFI_ERROR (Status); > > > } > > > > > > gBS->UninstallProtocolInterface ( > > > -- > > > 2.20.1 > > > _______________________________________________ > edk2-devel mailing list > edk2-devel@lists.01.org > https://lists.01.org/mailman/listinfo/edk2-devel _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
