Re: [PATCH] MdeModulePkg: Add EFI_GCD_MEMORY_SPACE_NOTIFY_PROTOCOL

["Duran, Leo" <leo.duran@amd.com>]

All,

Let's please drop this patch for now... We're evaluating Yao's suggestion (which looks OK so far).

Thanks,
Leo.

From: Yao, Jiewen [mailto:jiewen.yao@intel.com]
Sent: Wednesday, April 12, 2017 10:06 PM
To: Duran, Leo <leo.duran@amd.com>; Zeng, Star <star.zeng@intel.com>; Laszlo Ersek <lersek@redhat.com>; Kinney, Michael D <michael.d.kinney@intel.com>; edk2-devel@ml01.01.org
Cc: Tian, Feng <feng.tian@intel.com>; Singh, Brijesh <brijesh.singh@amd.com>; Yao, Jiewen <jiewen.yao@intel.com>
Subject: RE: [edk2] [PATCH] MdeModulePkg: Add EFI_GCD_MEMORY_SPACE_NOTIFY_PROTOCOL

Yes, exactly.
I hope the default path be as simple as possible.

Then we only need update the page table in the corner case.

Thank you
Yao Jiewen

From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Duran, Leo
Sent: Thursday, April 13, 2017 10:44 AM
To: Yao, Jiewen <jiewen.yao@intel.com<mailto:jiewen.yao@intel.com>>; Zeng, Star <star.zeng@intel.com<mailto:star.zeng@intel.com>>; Laszlo Ersek <lersek@redhat.com<mailto:lersek@redhat.com>>; Kinney, Michael D <michael.d.kinney@intel.com<mailto:michael.d.kinney@intel.com>>; edk2-devel@ml01.01.org<mailto:edk2-devel@ml01.01.org>
Cc: Tian, Feng <feng.tian@intel.com<mailto:feng.tian@intel.com>>; Singh, Brijesh <brijesh.singh@amd.com<mailto:brijesh.singh@amd.com>>
Subject: Re: [edk2] [PATCH] MdeModulePkg: Add EFI_GCD_MEMORY_SPACE_NOTIFY_PROTOCOL


From: Yao, Jiewen [mailto:jiewen.yao@intel.com]
Sent: Wednesday, April 12, 2017 9:40 PM
To: Duran, Leo <leo.duran@amd.com<mailto:leo.duran@amd.com>>; Zeng, Star <star.zeng@intel.com<mailto:star.zeng@intel.com>>; Laszlo Ersek <lersek@redhat.com<mailto:lersek@redhat.com>>; Kinney, Michael D <michael.d.kinney@intel.com<mailto:michael.d.kinney@intel.com>>; edk2-devel@ml01.01.org<mailto:edk2-devel@ml01.01.org>
Cc: Tian, Feng <feng.tian@intel.com<mailto:feng.tian@intel.com>>; Singh, Brijesh <brijesh.singh@amd.com<mailto:brijesh.singh@amd.com>>; Yao, Jiewen <jiewen.yao@intel.com<mailto:jiewen.yao@intel.com>>
Subject: RE: [edk2] [PATCH] MdeModulePkg: Add EFI_GCD_MEMORY_SPACE_NOTIFY_PROTOCOL

Hi Leo
Can we clear SEC for all non-DRAM region, instead of MMIO region?

Then we do not need worried about 'ADD' MMIO.

[Duran, Leo] Ummh... Let me check with Brijesh.
I guess you're suggesting a one-time deal, done once page tables are created.

Thank you
Yao Jiewen

From: Duran, Leo [mailto:leo.duran@amd.com]
Sent: Thursday, April 13, 2017 10:35 AM
To: Zeng, Star <star.zeng@intel.com<mailto:star.zeng@intel.com<mailto:star.zeng@intel.com%3cmailto:star.zeng@intel.com>>>; Laszlo Ersek <lersek@redhat.com<mailto:lersek@redhat.com<mailto:lersek@redhat.com%3cmailto:lersek@redhat.com>>>; Kinney, Michael D <michael.d.kinney@intel.com<mailto:michael.d.kinney@intel.com<mailto:michael.d.kinney@intel.com%3cmailto:michael.d.kinney@intel.com>>>; edk2-devel@ml01.01.org<mailto:edk2-devel@ml01.01.org<mailto:edk2-devel@ml01.01.org%3cmailto:edk2-devel@ml01.01.org>>
Cc: Tian, Feng <feng.tian@intel.com<mailto:feng.tian@intel.com<mailto:feng.tian@intel.com%3cmailto:feng.tian@intel.com>>>; Singh, Brijesh <brijesh.singh@amd.com<mailto:brijesh.singh@amd.com<mailto:brijesh.singh@amd.com%3cmailto:brijesh.singh@amd.com>>>; Yao, Jiewen <jiewen.yao@intel.com<mailto:jiewen.yao@intel.com<mailto:jiewen.yao@intel.com%3cmailto:jiewen.yao@intel.com>>>
Subject: RE: [edk2] [PATCH] MdeModulePkg: Add EFI_GCD_MEMORY_SPACE_NOTIFY_PROTOCOL

Hi Star,

At DxeIpl time we only have the MMIO regions published by descriptor HOB's built during PEI.
But we also need to capture MMIO regions that may be 'added' by DXE drivers (e.g., PciHostBridgeDxe), ideally without making changes to those drivers.

So our thinking is that trapping the 'Add' MMIO requests that come into GCD would be a good place to capture what we need.

Thanks,
Leo.

> -----Original Message-----
> From: Zeng, Star [mailto:star.zeng@intel.com]
> Sent: Wednesday, April 12, 2017 9:14 PM
> To: Duran, Leo <leo.duran@amd.com<mailto:leo.duran@amd.com<mailto:leo.duran@amd.com%3cmailto:leo.duran@amd.com>>>; Laszlo Ersek <lersek@redhat.com<mailto:lersek@redhat.com<mailto:lersek@redhat.com%3cmailto:lersek@redhat.com>>>;
> Kinney, Michael D <michael.d.kinney@intel.com<mailto:michael.d.kinney@intel.com<mailto:michael.d.kinney@intel.com%3cmailto:michael.d.kinney@intel.com>>>; edk2-devel@ml01.01.org<mailto:edk2-devel@ml01.01.org<mailto:edk2-devel@ml01.01.org%3cmailto:edk2-devel@ml01.01.org>>
> Cc: Tian, Feng <feng.tian@intel.com<mailto:feng.tian@intel.com<mailto:feng.tian@intel.com%3cmailto:feng.tian@intel.com>>>; Singh, Brijesh
> <brijesh.singh@amd.com<mailto:brijesh.singh@amd.com<mailto:brijesh.singh@amd.com%3cmailto:brijesh.singh@amd.com>>>; Yao, Jiewen <jiewen.yao@intel.com<mailto:jiewen.yao@intel.com<mailto:jiewen.yao@intel.com%3cmailto:jiewen.yao@intel.com>>>; Zeng, Star
> <star.zeng@intel.com<mailto:star.zeng@intel.com<mailto:star.zeng@intel.com%3cmailto:star.zeng@intel.com>>>
> Subject: RE: [edk2] [PATCH] MdeModulePkg: Add
> EFI_GCD_MEMORY_SPACE_NOTIFY_PROTOCOL
>
> Does the solution Jiewen proposed at https://lists.01.org/pipermail/edk2-
> devel/2017-March/008987.html also work for this case similarly?
>
> Thanks,
> Star
> -----Original Message-----
> From: Kinney, Michael D
> Sent: Thursday, April 13, 2017 8:59 AM
> To: Laszlo Ersek <lersek@redhat.com<mailto:lersek@redhat.com<mailto:lersek@redhat.com%3cmailto:lersek@redhat.com>>>; Leo Duran <leo.duran@amd.com<mailto:leo.duran@amd.com<mailto:leo.duran@amd.com%3cmailto:leo.duran@amd.com>>>;
> edk2-devel@ml01.01.org<mailto:edk2-devel@ml01.01.org<mailto:edk2-devel@ml01.01.org%3cmailto:edk2-devel@ml01.01.org>>; Kinney, Michael D <michael.d.kinney@intel.com<mailto:michael.d.kinney@intel.com<mailto:michael.d.kinney@intel.com%3cmailto:michael.d.kinney@intel.com>>>
> Cc: Tian, Feng <feng.tian@intel.com<mailto:feng.tian@intel.com<mailto:feng.tian@intel.com%3cmailto:feng.tian@intel.com>>>; Brijesh Singh
> <brijesh.singh@amd.com<mailto:brijesh.singh@amd.com<mailto:brijesh.singh@amd.com%3cmailto:brijesh.singh@amd.com>>>; Zeng, Star <star.zeng@intel.com<mailto:star.zeng@intel.com<mailto:star.zeng@intel.com%3cmailto:star.zeng@intel.com>>>
> Subject: RE: [edk2] [PATCH] MdeModulePkg: Add
> EFI_GCD_MEMORY_SPACE_NOTIFY_PROTOCOL
>
> Hi Laszlo and Leo,
>
> If you look at the CpuSetMemoryAttributes() function in
> UefiCpuPkg/CpuDxe/CpuDxe.c, you will see it now calls
> AssignMemoryPageAttributes() at the end.  This function is implemented in
> UefiCpuPkg/CpuDxe/CpuPageTable.c and it updates page table attributes
> based on the request.
>
> This looks like a very similar action to update PTEs.
>
> What MMIO areas are we discussing here?  MMIO ranges associated with PCI
> BARs allocated through PCI Bus Driver and PCI Host Bridge driver?
>
> Mike
>
> > -----Original Message-----
> > From: Laszlo Ersek [mailto:lersek@redhat.com]
> > Sent: Wednesday, April 12, 2017 1:33 PM
> > To: Kinney, Michael D <michael.d.kinney@intel.com<mailto:michael.d.kinney@intel.com<mailto:michael.d.kinney@intel.com%3cmailto:michael.d.kinney@intel.com>>>; Leo Duran
> > <leo.duran@amd.com<mailto:leo.duran@amd.com<mailto:leo.duran@amd.com%3cmailto:leo.duran@amd.com>>>; edk2-devel@ml01.01.org<mailto:edk2-devel@ml01.01.org<mailto:edk2-devel@ml01.01.org%3cmailto:edk2-devel@ml01.01.org>>
> > Cc: Tian, Feng <feng.tian@intel.com<mailto:feng.tian@intel.com<mailto:feng.tian@intel.com%3cmailto:feng.tian@intel.com>>>; Brijesh Singh
> > <brijesh.singh@amd.com<mailto:brijesh.singh@amd.com<mailto:brijesh.singh@amd.com%3cmailto:brijesh.singh@amd.com>>>; Zeng, Star <star.zeng@intel.com<mailto:star.zeng@intel.com<mailto:star.zeng@intel.com%3cmailto:star.zeng@intel.com>>>
> > Subject: Re: [edk2] [PATCH] MdeModulePkg: Add
> > EFI_GCD_MEMORY_SPACE_NOTIFY_PROTOCOL
> >
> > Mike,
> >
> > On 04/12/17 21:39, Kinney, Michael D wrote:
> > > Hi Leo,
> > >
> > > DXE Main is supposed to use Arch Protocols for platform specific
> behavior.
> > >
> > > In this case, can the CPU Arch Protocol SetMemoryAttributes()
> > > function be used to customize behavior?
> > >
> > > In other modules that add/remove/modify MMIO,
> > > gDS->SetMemorySpaceAttributes() Is called to set memory space
> > > attributed such as cachability.  Can the module that is
> > > adding/removing memory regions from GCD also call
> > > gDS-> SetMemorySpaceAttributes() so a CPU specific module can
> > > gDS-> perform
> > > extra actions?
> >
> > The goal is to clear the "C" bit in the PTEs (--> disable encryption
> > in SEV guests) for all MMIO areas in the GCD memory space map, when
> > they are added, and to re-set the "C" bit when the area is removed (or
> > the area's GCD type is changed to something non-MMIO).
> >
> > This behavior should cover all possible gDS->AddMemorySpace() calls
> > (for the MMIO type), regardless of what driver calls gDS-
> >AddMemorySpace().
> > In other words, drivers that add MMIO space should remain unaware of
> > SEV / the "C" bit in PTEs. Otherwise we'd have to enable SEV detection
> > and "C" bit massaging in every affected driver individually (even
> > future ones, possibly pulled in from under MdeModulePkg or UefiCpuPkg).
> > Cacheability and similar attributes for memory ranges are quite
> > universal on all architectures, and it is okay to expect all drivers
> > to manage those attributes manually (whenever that's necessary), but
> > (a) SEV / memory encryption is not that universal, and (b) clearing
> > "C" for MMIO ranges affects all drivers alike, so it would be good to
> > generalize it at a low level.
> >
> > What would be the best general location or API to hook the "C" bit
> > manipulation into MMIO GCD memory space addition / removal?
> >
> > Thank you,
> > Laszlo
> >
> >
> > >
> > > Thanks,
> > >
> > > Mike
> > >
> > >
> > >
> > >> -----Original Message-----
> > >> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf
> > >> Of Leo
> > Duran
> > >> Sent: Wednesday, April 12, 2017 11:57 AM
> > >> To: edk2-devel@ml01.01.org<mailto:edk2-devel@ml01.01.org<mailto:edk2-devel@ml01.01.org%3cmailto:edk2-devel@ml01.01.org>>
> > >> Cc: Laszlo Ersek <lersek@redhat.com<mailto:lersek@redhat.com<mailto:lersek@redhat.com%3cmailto:lersek@redhat.com>>>; Tian, Feng
> > >> <feng.tian@intel.com<mailto:feng.tian@intel.com<mailto:feng.tian@intel.com%3cmailto:feng.tian@intel.com>>>; Leo
> > Duran
> > >> <leo.duran@amd.com<mailto:leo.duran@amd.com<mailto:leo.duran@amd.com%3cmailto:leo.duran@amd.com>>>; Brijesh Singh <brijesh.singh@amd.com<mailto:brijesh.singh@amd.com<mailto:brijesh.singh@amd.com%3cmailto:brijesh.singh@amd.com>>>; Zeng,
> > >> Star <star.zeng@intel.com<mailto:star.zeng@intel.com<mailto:star.zeng@intel.com%3cmailto:star.zeng@intel.com>>>
> > >> Subject: [edk2] [PATCH] MdeModulePkg: Add
> > >> EFI_GCD_MEMORY_SPACE_NOTIFY_PROTOCOL
> > >>
> > >> GCD consumes the protocol to issue a Notify() on Add/Remove
> operations.
> > >>
> > >> The intended use-case is to allow OvmfPkg take actions on behalf of
> > >> an SEV-enabled guest.
> > >>
> > >> The new protocol is simply added to the list of optional protocols
> > >> handled by DxeMain, and as such leverages the existing
> DxeProtocolNotify framework.
> > >>
> > >> Cc: Feng Tian <feng.tian@intel.com<mailto:feng.tian@intel.com<mailto:feng.tian@intel.com%3cmailto:feng.tian@intel.com>>>
> > >> Cc: Star Zeng <star.zeng@intel.com<mailto:star.zeng@intel.com<mailto:star.zeng@intel.com%3cmailto:star.zeng@intel.com>>>
> > >> Cc: Laszlo Ersek <lersek@redhat.com<mailto:lersek@redhat.com<mailto:lersek@redhat.com%3cmailto:lersek@redhat.com>>>
> > >> Cc: Brijesh Singh <brijesh.singh@amd.com<mailto:brijesh.singh@amd.com<mailto:brijesh.singh@amd.com%3cmailto:brijesh.singh@amd.com>>>
> > >> Contributed-under: TianoCore Contribution Agreement 1.0
> > >> Signed-off-by: Leo Duran <leo.duran@amd.com<mailto:leo.duran@amd.com<mailto:leo.duran@amd.com%3cmailto:leo.duran@amd.com>>>
> > >> ---
> > >>  MdeModulePkg/Core/Dxe/DxeMain.h                    | 10 +++-
> > >>  MdeModulePkg/Core/Dxe/DxeMain.inf                  |  4 ++
> > >>  MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c            |  7 +++
> > >>  MdeModulePkg/Core/Dxe/DxeMain/DxeProtocolNotify.c  |  9 ++-
> > >>  MdeModulePkg/Core/Dxe/Gcd/Gcd.c                    |  8 +++
> > >>  .../Include/Protocol/GcdMemorySpaceNotify.h        | 65
> > ++++++++++++++++++++++
> > >>  MdeModulePkg/MdeModulePkg.dec                      |  3 +
> > >>  7 files changed, 100 insertions(+), 6 deletions(-)  create mode
> > >> 100644 MdeModulePkg/Include/Protocol/GcdMemorySpaceNotify.h
> > >>
> > >> diff --git a/MdeModulePkg/Core/Dxe/DxeMain.h
> > >> b/MdeModulePkg/Core/Dxe/DxeMain.h index 1a0babb..8a037ff
> 100644
> > >> --- a/MdeModulePkg/Core/Dxe/DxeMain.h
> > >> +++ b/MdeModulePkg/Core/Dxe/DxeMain.h
> > >> @@ -3,6 +3,8 @@
> > >>    internal structure and functions used by DxeCore module.
> > >>
> > >>  Copyright (c) 2006 - 2017, Intel Corporation. All rights
> > >> reserved.<BR>
> > >> +Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
> > >> +
> > >>  This program and the accompanying materials  are licensed and made
> > >> available under the terms and conditions of the BSD License  which
> > >> accompanies this distribution.  The full text of the license may be
> > found
> > >> at
> > >> @@ -17,7 +19,6 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF
> ANY
> > >> KIND, EITHER EXPRESS OR IMPLIED.
> > >>  #define _DXE_MAIN_H_
> > >>
> > >>
> > >> -
> > >>  #include <PiDxe.h>
> > >>
> > >>  #include <Protocol/LoadedImage.h>
> > >> @@ -53,6 +54,8 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF
> ANY
> > >> KIND, EITHER EXPRESS OR IMPLIED.
> > >>  #include <Protocol/TcgService.h>
> > >>  #include <Protocol/HiiPackageList.h>  #include
> > >> <Protocol/SmmBase2.h>
> > >> +#include <Protocol/GcdMemorySpaceNotify.h>
> > >> +
> > >>  #include <Guid/MemoryTypeInformation.h>  #include
> > >> <Guid/FirmwareFileSystem2.h>  #include
> <Guid/FirmwareFileSystem3.h>
> > >> @@ -296,12 +299,13 @@ extern EFI_RUNTIME_ARCH_PROTOCOL
> > >> gRuntimeTemplate;
> > >>
> > >>  extern EFI_LOAD_FIXED_ADDRESS_CONFIGURATION_TABLE
> > >> gLoadModuleAtFixAddressConfigurationTable;
> > >>  extern BOOLEAN
> > >> gLoadFixedAddressCodeMemoryReady;
> > >> +
> > >> +extern EFI_GCD_MEMORY_SPACE_NOTIFY_PROTOCOL
> *gGcdMemorySpaceNotify;
> > >> +
> > >>  //
> > >>  // Service Initialization Functions  //
> > >>
> > >> -
> > >> -
> > >>  /**
> > >>    Called to initialize the pool.
> > >>
> > >> diff --git a/MdeModulePkg/Core/Dxe/DxeMain.inf
> > >> b/MdeModulePkg/Core/Dxe/DxeMain.inf
> > >> index 30d5984..888a16f 100644
> > >> --- a/MdeModulePkg/Core/Dxe/DxeMain.inf
> > >> +++ b/MdeModulePkg/Core/Dxe/DxeMain.inf
> > >> @@ -4,6 +4,8 @@
> > >>  #  It provides an implementation of DXE Core that is compliant with DXE
> CIS.
> > >>  #
> > >>  #  Copyright (c) 2006 - 2017, Intel Corporation. All rights
> > >> reserved.<BR>
> > >> +#  Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
> > >> +#
> > >>  #  This program and the accompanying materials  #  are licensed
> > >> and made available under the terms and conditions of the BSD
> > >> License  #  which accompanies this distribution.  The full text of
> > >> the license may be found at @@ -162,6 +164,8 @@
> > >>    gEfiSmmBase2ProtocolGuid                      ## SOMETIMES_CONSUMES
> > >>    gEfiBlockIoProtocolGuid                       ## SOMETIMES_CONSUMES
> > >>
> > >> +  gEfiGcdMemorySpaceNotifyProtocolGuid          ## CONSUMES
> > >> +
> > >>    # Arch Protocols
> > >>    gEfiBdsArchProtocolGuid                       ## CONSUMES
> > >>    gEfiCpuArchProtocolGuid                       ## CONSUMES
> > >> diff --git a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
> > >> b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
> > >> index 91e94a7..46b68da 100644
> > >> --- a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
> > >> +++ b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
> > >> @@ -2,6 +2,8 @@
> > >>    DXE Core Main Entry Point
> > >>
> > >>  Copyright (c) 2006 - 2017, Intel Corporation. All rights
> > >> reserved.<BR>
> > >> +Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
> > >> +
> > >>  This program and the accompanying materials  are licensed and made
> > >> available under the terms and conditions of the BSD License  which
> > >> accompanies this distribution.  The full text of the license may be
> > found
> > >> at
> > >> @@ -42,6 +44,11 @@ EFI_GUID                           *gDxeCoreFileName;
> > >>  EFI_LOADED_IMAGE_PROTOCOL          *gDxeCoreLoadedImage;
> > >>
> > >>  //
> > >> +// DXE Core global for GCD notification protocol //
> > >> +EFI_GCD_MEMORY_SPACE_NOTIFY_PROTOCOL
> *gGcdMemorySpaceNotify =
> > >> +NULL;
> > >> +
> > >> +//
> > >>  // DXE Core Module Variables
> > >>  //
> > >>  EFI_BOOT_SERVICES mBootServices = { diff --git
> > >> a/MdeModulePkg/Core/Dxe/DxeMain/DxeProtocolNotify.c
> > >> b/MdeModulePkg/Core/Dxe/DxeMain/DxeProtocolNotify.c
> > >> index ea7c610..2314e34 100644
> > >> --- a/MdeModulePkg/Core/Dxe/DxeMain/DxeProtocolNotify.c
> > >> +++ b/MdeModulePkg/Core/Dxe/DxeMain/DxeProtocolNotify.c
> > >> @@ -4,6 +4,8 @@
> > >>    events that represent the Architectural Protocols.
> > >>
> > >>  Copyright (c) 2006 - 2014, Intel Corporation. All rights
> > >> reserved.<BR>
> > >> +Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
> > >> +
> > >>  This program and the accompanying materials  are licensed and made
> > >> available under the terms and conditions of the BSD License  which
> > >> accompanies this distribution.  The full text of the license may be
> > found
> > >> at
> > >> @@ -45,9 +47,10 @@ EFI_CORE_PROTOCOL_NOTIFY_ENTRY
> mArchProtocols[]
> > >> = {  // Optional protocols that the DXE Core will use if they are
> > >> present  //  EFI_CORE_PROTOCOL_NOTIFY_ENTRY
> mOptionalProtocols[] =
> > >> {
> > >> -  { &gEfiSecurity2ArchProtocolGuid,        (VOID **)&gSecurity2,     NULL,
> > NULL,
> > >> FALSE },
> > >> -  { &gEfiSmmBase2ProtocolGuid,             (VOID **)&gSmmBase2,
> NULL,
> > NULL,
> > >> FALSE },
> > >> -  { NULL,                                  (VOID **)NULL,            NULL,
> > NULL,
> > >> FALSE }
> > >> +  { &gEfiSecurity2ArchProtocolGuid,        (VOID **)&gSecurity2,
> > >> NULL, NULL, FALSE },
> > >> +  { &gEfiSmmBase2ProtocolGuid,             (VOID **)&gSmmBase2,
> > >> NULL, NULL, FALSE },
> > >> +  { &gEfiGcdMemorySpaceNotifyProtocolGuid, (VOID
> > >> + **)&gGcdMemorySpaceNotify,
> > >> NULL, NULL, FALSE },
> > >> +  { NULL,                                  (VOID **)NULL,
> > >> NULL, NULL, FALSE }
> > >>  };
> > >>
> > >>  //
> > >> diff --git a/MdeModulePkg/Core/Dxe/Gcd/Gcd.c
> > >> b/MdeModulePkg/Core/Dxe/Gcd/Gcd.c index a06f8bb..223fcd8 100644
> > >> --- a/MdeModulePkg/Core/Dxe/Gcd/Gcd.c
> > >> +++ b/MdeModulePkg/Core/Dxe/Gcd/Gcd.c
> > >> @@ -4,6 +4,8 @@
> > >>    are accessible to the CPU that is executing the DXE core.
> > >>
> > >>  Copyright (c) 2006 - 2017, Intel Corporation. All rights
> > >> reserved.<BR>
> > >> +Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
> > >> +
> > >>  This program and the accompanying materials  are licensed and made
> > >> available under the terms and conditions of the BSD License  which
> > >> accompanies this distribution.  The full text of the license may be
> > found
> > >> at
> > >> @@ -896,6 +898,9 @@ CoreConvertSpace (
> > >>        } else {
> > >>          Entry->Capabilities  = Capabilities | EFI_MEMORY_RUNTIME;
> > >>        }
> > >> +      if (gGcdMemorySpaceNotify) {
> > >> +        gGcdMemorySpaceNotify->MemorySpaceAddNotify
> > >> + (GcdMemoryType,
> > BaseAddress,
> > >> Length, Entry->Capabilities);
> > >> +      }
> > >>        break;
> > >>      case GCD_ADD_IO_OPERATION:
> > >>        Entry->GcdIoType = GcdIoType; @@ -914,6 +919,9 @@
> > >> CoreConvertSpace (
> > >>      case GCD_REMOVE_MEMORY_OPERATION:
> > >>        Entry->GcdMemoryType = EfiGcdMemoryTypeNonExistent;
> > >>        Entry->Capabilities  = 0;
> > >> +      if (gGcdMemorySpaceNotify) {
> > >> +        gGcdMemorySpaceNotify->MemorySpaceRemoveNotify
> (BaseAddress, Length);
> > >> +      }
> > >>        break;
> > >>      case GCD_REMOVE_IO_OPERATION:
> > >>        Entry->GcdIoType = EfiGcdIoTypeNonExistent; diff --git
> > >> a/MdeModulePkg/Include/Protocol/GcdMemorySpaceNotify.h
> > >> b/MdeModulePkg/Include/Protocol/GcdMemorySpaceNotify.h
> > >> new file mode 100644
> > >> index 0000000..9174957
> > >> --- /dev/null
> > >> +++ b/MdeModulePkg/Include/Protocol/GcdMemorySpaceNotify.h
> > >> @@ -0,0 +1,65 @@
> > >> +/** @file
> > >> +  This file declares the GcdMemorySpaceNotify Protocol.
> > >> +
> > >> +  This Protocol is consumed by GCD to issue notications during
> > >> + ADD/REMOVE
> > >> operations.
> > >> +
> > >> +  Copyright (c) 2017, AMD Inc. All rights reserved.<BR>
> > >> +
> > >> +  This program and the accompanying materials  are licensed and
> > >> + made available under the terms and conditions of the BSD
> > >> License
> > >> +  which accompanies this distribution.  The full text of the
> > >> + license may be
> > >> found at
> > >> +  http://opensource.org/licenses/bsd-license.php
> > >> +
> > >> +  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS
> IS"
> > >> + BASIS,  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND,
> EITHER
> > >> + EXPRESS OR
> > IMPLIED.
> > >> +
> > >> +**/
> > >> +
> > >> +#ifndef __EFI_GCD_MEMORY_SPACE_NOTIFY_H__ #define
> > >> +__EFI_GCD_MEMORY_SPACE_NOTIFY_H__
> > >> +
> > >> +#define EFI_GCD_MEMORY_SPACE_NOTIFY_GUID \
> > >> +  { \
> > >> +    0xc842db69, 0x610e, 0x401a, {0x90, 0xd0, 0x88, 0x41, 0xf1,
> > >> +0xdc, 0x53,
> > 0x79
> > >> } \
> > >> +  }
> > >> +
> > >> +/**
> > >> +  Notify on: Add a segment of memory to GCD map.
> > >> +
> > >> +  @param  GcdMemoryType          Memory type of the segment.
> > >> +  @param  BaseAddress            Base address of the segment.
> > >> +  @param  Length                 Length of the segment.
> > >> +  @param  Capabilities           Alterable attributes of the segment.
> > >> +
> > >> +**/
> > >> +typedef
> > >> +VOID
> > >> +(EFIAPI *GCD_ADD_MEMORY_NOTIFY) (
> > >> +  IN EFI_GCD_MEMORY_TYPE   GcdMemoryType,
> > >> +  IN EFI_PHYSICAL_ADDRESS  BaseAddress,
> > >> +  IN UINT64                Length,
> > >> +  IN UINT64                Capabilities
> > >> +);
> > >> +
> > >> +/**
> > >> +  Notify on: Remove a segment of memory to GCD map.
> > >> +
> > >> +  @param  BaseAddress            Base address of the segment.
> > >> +  @param  Length                 Length of the segment.
> > >> +
> > >> +**/
> > >> +typedef
> > >> +VOID
> > >> +(EFIAPI *GCD_REMOVE_MEMORY_NOTIFY) (
> > >> +  IN EFI_PHYSICAL_ADDRESS  BaseAddress,
> > >> +  IN UINT64                Length
> > >> +);
> > >> +
> > >> +typedef struct {
> > >> +  GCD_ADD_MEMORY_NOTIFY     MemorySpaceAddNotify;
> > >> +  GCD_REMOVE_MEMORY_NOTIFY  MemorySpaceRemoveNotify; }
> > >> +EFI_GCD_MEMORY_SPACE_NOTIFY_PROTOCOL;
> > >> +
> > >> +extern EFI_GUID gEfiGcdMemorySpaceNotifyProtocolGuid;
> > >> +
> > >> +#endif
> > >> diff --git a/MdeModulePkg/MdeModulePkg.dec
> > >> b/MdeModulePkg/MdeModulePkg.dec index ca09cbc..95f9311 100644
> > >> --- a/MdeModulePkg/MdeModulePkg.dec
> > >> +++ b/MdeModulePkg/MdeModulePkg.dec
> > >> @@ -546,6 +546,9 @@
> > >>    ## Include/Protocol/NonDiscoverableDevice.h
> > >>    gEdkiiNonDiscoverableDeviceProtocolGuid = { 0x0d51905b, 0xb77e,
> > >> 0x452a,
> > {0xa2,
> > >> 0xc0, 0xec, 0xa0, 0xcc, 0x8d, 0x51, 0x4a } }
> > >>
> > >> +  ## Include/Protocol/GcdMemorySpaceNotify.h
> > >> +  gEfiGcdMemorySpaceNotifyProtocolGuid  = { 0xc842db69, 0x610e,
> > >> + 0x401a,
> > {0x90,
> > >> 0xd0, 0x88, 0x41, 0xf1, 0xdc, 0x53, 0x79 } }
> > >> +
> > >>  #
> > >>  # [Error.gEfiMdeModulePkgTokenSpaceGuid]
> > >>  #   0x80000001 | Invalid value provided.
> > >> --
> > >> 2.7.4
> > >>
> > >> _______________________________________________
> > >> edk2-devel mailing list
> > >> edk2-devel@lists.01.org<mailto:edk2-devel@lists.01.org<mailto:edk2-devel@lists.01.org%3cmailto:edk2-devel@lists.01.org>>
> > >> https://lists.01.org/mailman/listinfo/edk2-devel
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