On 3/30/20 7:47 PM, Dong, Eric wrote:
Hi Tom,

Sorry for late response. It’s a huge patch, please give me two more weeks to detail review them.

I have rough go through these patches and have some basic comments for them now:

1.It’s better to spit patch if changes files not in same package. Like patch 1/42.

Ok, will do.


2.All functions need to have comments for them. Miss comments in patch 10/42 and others.

Just external functions or both external and internal (STATIC) functions, too?

Thanks,
Tom


Please update patches to fix above basic checks first.

Thanks,

Eric

*From:*devel@edk2.groups.io [mailto:devel@edk2.groups.io] *On Behalf Of *Lendacky, Thomas
*Sent:* Tuesday, March 31, 2020 12:54 AM
*To:* devel@edk2.groups.io
*Cc:* Justen, Jordan L <jordan.l.jus...@intel.com>; Laszlo Ersek <ler...@redhat.com>; Ard Biesheuvel <ard.biesheu...@linaro.org>; Kinney, Michael D <michael.d.kin...@intel.com>; Gao, Liming <liming....@intel.com>; Dong, Eric <eric.d...@intel.com>; Ni, Ray <ray...@intel.com>; Brijesh Singh <brijesh.si...@amd.com>; You, Benjamin <benjamin....@intel.com>; Bi, Dandan <dandan...@intel.com>; Dong, Guo <guo.d...@intel.com>; Wu, Hao A <hao.a...@intel.com>; Wang, Jian J <jian.j.w...@intel.com>; Ma, Maurice <maurice...@intel.com>
*Subject:* Re: [edk2-devel] [PATCH v6 00/42] SEV-ES guest support

I've gotten some nice feedback from Laszlo, especially on the OvmfPkg side
of this patchset, but haven't seen much response from the other
maintainers. Is there any feedback on the MdePkg, MdeModulePkg and
UefiCpuPkg changes that needs to be addressed in order to merge this?

I do have some minor changes on ensuring the per-CPU variable page stays
encrypted, but not much beyond that. Those changes can be submitted
afterwards or as a new version before inclusion.

Thanks,
Tom

On 3/24/20 12:40 PM, Tom Lendacky wrote:
 This patch series provides support for running EDK2/OVMF under SEV-ES.

 Secure Encrypted Virtualization - Encrypted State (SEV-ES) expands on the
 SEV support to protect the guest register state from the hypervisor. See
 "AMD64 Architecture Programmer's Manual Volume 2: System Programming",
 section "15.35 Encrypted State (SEV-ES)" [1].

 In order to allow a hypervisor to perform functions on behalf of a guest,
 there is architectural support for notifying a guest's operating system
 when certain types of VMEXITs are about to occur. This allows the guest to
 selectively share information with the hypervisor to satisfy the requested
 function. The notification is performed using a new exception, the VMM
 Communication exception (#VC). The information is shared through the
 Guest-Hypervisor Communication Block (GHCB) using the VMGEXIT instruction.
 The GHCB format and the protocol for using it is documented in "SEV-ES
 Guest-Hypervisor Communication Block Standardization" [2].

 The main areas of the EDK2 code that are updated to support SEV-ES are
 around the exception handling support and the AP boot support.

 Exception support is required starting in Sec, continuing through Pei
 and into Dxe in order to handle #VC exceptions that are generated.  Each
 AP requires it's own GHCB page as well as a page to hold values specific
 to that AP.

 AP booting poses some interesting challenges. The INIT-SIPI-SIPI sequence
 is typically used to boot the APs. However, the hypervisor is not allowed
 to update the guest registers. The GHCB document [2] talks about how SMP
 booting under SEV-ES is performed.

 Since the GHCB page must be a shared (unencrypted) page, the processor
 must be running in long mode in order for the guest and hypervisor to
 communicate with each other. As a result, SEV-ES is only supported under
 the X64 architecture.

 [1] https://www.amd.com/system/files/TechDocs/24593.pdf
<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.amd.com%2Fsystem%2Ffiles%2FTechDocs%2F24593.pdf&data=02%7C01%7Cthomas.lendacky%40amd.com%7C2ee33c1d932a4906558f08d7d50d1ca2%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637212125835211690&sdata=Q%2BIjeq%2FRDgiovKtPeA4TGDVorCK07jQVNZ7N9kvD%2BuE%3D&reserved=0>
 [2] https://developer.amd.com/wp-content/resources/56421.pdf
<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdeveloper.amd.com%2Fwp-content%2Fresources%2F56421.pdf&data=02%7C01%7Cthomas.lendacky%40amd.com%7C2ee33c1d932a4906558f08d7d50d1ca2%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637212125835221679&sdata=bos02T0YR3i5xji9rhjPl7jpS5uJPKt1Q0hhdy%2FoMR0%3D&reserved=0>

 ---

 These patches are based on commit:
 2f524a745e23 ("BaseTools:Fix build tools print traceback info issue")

 Proper execution of SEV-ES relies on Bugzilla 2340 being fixed.

 A version of the tree (with an extra patch to workaround Bugzilla 2340) can
 be found at:
https://github.com/AMDESE/ovmf/tree/sev-es-v13
<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FAMDESE%2Fovmf%2Ftree%2Fsev-es-v13&data=02%7C01%7Cthomas.lendacky%40amd.com%7C2ee33c1d932a4906558f08d7d50d1ca2%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637212125835221679&sdata=fmIyS5QBB7YGDSqTFiBIe%2BBdH1zatcEplUdNC2wi%2Fhc%3D&reserved=0>

 Cc: Ard Biesheuvel <ard.biesheu...@linaro.org 
<mailto:ard.biesheu...@linaro.org>>
 Cc: Benjamin You <benjamin....@intel.com <mailto:benjamin....@intel.com>>
 Cc: Dandan Bi <dandan...@intel.com <mailto:dandan...@intel.com>>
 Cc: Eric Dong <eric.d...@intel.com <mailto:eric.d...@intel.com>>
 Cc: Guo Dong <guo.d...@intel.com <mailto:guo.d...@intel.com>>
 Cc: Hao A Wu <hao.a...@intel.com <mailto:hao.a...@intel.com>>
 Cc: Jian J Wang <jian.j.w...@intel.com <mailto:jian.j.w...@intel.com>>
 Cc: Jordan Justen <jordan.l.jus...@intel.com 
<mailto:jordan.l.jus...@intel.com>>
 Cc: Laszlo Ersek <ler...@redhat.com <mailto:ler...@redhat.com>>
 Cc: Liming Gao <liming....@intel.com <mailto:liming....@intel.com>>
 Cc: Maurice Ma <maurice...@intel.com <mailto:maurice...@intel.com>>
 Cc: Michael D Kinney <michael.d.kin...@intel.com 
<mailto:michael.d.kin...@intel.com>>
 Cc: Ray Ni <ray...@intel.com <mailto:ray...@intel.com>>

 Changes since v5:
 - Remove extraneous VmgExitLib usage
 - Miscellaneous changes to address feedback (coding style, etc.)

 Changes since v4:
 - Move the SEV-ES protocol negotiation out of the SEC exception handler
    and into the SecMain.c file. As a result:
    - Move the SecGhcb related PCDs out of UefiCpuPkg and into OvmfPkg
    - Combine SecAMDSevVcHandler.c and PeiDxeAMDSevVcHandler.c into a
      single AMDSevVcHandler.c
 - Consolidate VmgExitLib usage into common LibraryClasses sections
 - Add documentation comments to the VmgExitLib functions

 Changes since v3:
 - Remove the need for the MP library finalization routine. The AP
    jump table address will be held by the hypervisor rather than
    communicated via the GHCB MSR. This removes some fragility around
    the UEFI to OS transition.
 - Rename the SEV-ES RIP reset area to SEV-ES workarea and use it to
    communicate the SEV-ES status, so that SEC CPU exception handling is
    only established for an SEV-ES guest.
 - Fix SMM build breakageAdd around QemuFlashPtrWrite().
 - Fix SMM build breakage by adding VC exception support the SMM CPU
    exception handling.
 - Add memory fencing around the invocation of AsmVmgExit().
 - Clarify comments around the SEV-ES AP reset RIP values and usage.
 - Move some PCD definitions from MdeModulePkg to UefiCpuPkg.
 - Remove the 16-bit code selector definition from MdeModulePkg

 Changes since v2:
 - Added a way to locate the SEV-ES fixed AP RIP address for starting
    AP's to avoid updating the actual flash image (build time location
    that is identified with a GUID value).
 - Create a VmgExit library to replace static inline functions.
 - Move some PCDs to the appropriate packages
 - Add support for writing to QEMU flash under SEV-ES
 - Add additional MMIO opcode support
 - Cleaned up the GHCB MSR CPUID protocol support

 Changes since v1:
 - Patches reworked to be more specific to the component/area being updated
    and order of definition/usage
 - Created a library for VMGEXIT-related functions to replace use of inline
    functions
 - Allocation method for GDT changed from AllocatePool to AllocatePages
 - Early caching only enabled for SEV-ES guests
 - Ensure AP loop mode set to halt loop mode for SEV-ES guests
 - Reserved SEC GHCB-related memory areas when S3 is enabled

 Tom Lendacky (42):
    MdePkg: Create PCDs to be used in support of SEV-ES
    MdePkg: Add the MSR definition for the GHCB register
    MdePkg: Add a structure definition for the GHCB
    MdeModulePkg/DxeIplPeim: Support GHCB pages when creating page tables
    MdePkg/BaseLib: Add support for the XGETBV instruction
    MdePkg/BaseLib: Add support for the VMGEXIT instruction
    UefiCpuPkg: Implement library support for VMGEXIT
    OvmfPkg: Prepare OvmfPkg to use the VmgExitLib library
    UefiPayloadPkg: Prepare UefiPayloadPkg to use the VmgExitLib library
    UefiCpuPkg/CpuExceptionHandler: Add base support for the #VC exception
    UefiCpuPkg/CpuExceptionHandler: Add support for IOIO_PROT NAE events
    UefiCpuPkg/CpuExceptionHandler: Support string IO for IOIO_PROT NAE
      events
    UefiCpuPkg/CpuExceptionHandler: Add support for CPUID NAE events
    UefiCpuPkg/CpuExceptionHandler: Add support for MSR_PROT NAE events
    UefiCpuPkg/CpuExceptionHandler: Add support for NPF NAE events (MMIO)
    UefiCpuPkg/CpuExceptionHandler: Add support for WBINVD NAE events
    UefiCpuPkg/CpuExceptionHandler: Add support for RDTSC NAE events
    UefiCpuPkg/CpuExceptionHandler: Add support for RDPMC NAE events
    UefiCpuPkg/CpuExceptionHandler: Add support for INVD NAE events
    UefiCpuPkg/CpuExceptionHandler: Add support for VMMCALL NAE events
    UefiCpuPkg/CpuExceptionHandler: Add support for RDTSCP NAE events
    UefiCpuPkg/CpuExceptionHandler: Add support for MONITOR/MONITORX NAE
      events
    UefiCpuPkg/CpuExceptionHandler: Add support for MWAIT/MWAITX NAE
      events
    UefiCpuPkg/CpuExceptionHandler: Add support for DR7 Read/Write NAE
      events
    OvmfPkg/MemEncryptSevLib: Add an SEV-ES guest indicator function
    OvmfPkg: Add support to perform SEV-ES initialization
    OvmfPkg: Create a GHCB page for use during Sec phase
    OvmfPkg/PlatformPei: Reserve GHCB-related areas if S3 is supported
    OvmfPkg: Create GHCB pages for use during Pei and Dxe phase
    OvmfPkg/PlatformPei: Move early GDT into ram when SEV-ES is enabled
    UefiCpuPkg: Create an SEV-ES workarea PCD
    OvmfPkg: Reserve a page in memory for the SEV-ES usage
    OvmfPkg/ResetVector: Add support for a 32-bit SEV check
    OvmfPkg/Sec: Add #VC exception handling for Sec phase
    OvmfPkg/Sec: Enable cache early to speed up booting
    OvmfPkg/QemuFlashFvbServicesRuntimeDxe: Bypass flash detection with
      SEV-ES is enabled
    UefiCpuPkg: Add a 16-bit protected mode code segment descriptor
    UefiCpuPkg/MpInitLib: Add CPU MP data flag to indicate if SEV-ES is
      enabled
    UefiCpuPkg: Allow AP booting under SEV-ES
    OvmfPkg: Use the SEV-ES work area for the SEV-ES AP reset vector
    OvmfPkg: Move the GHCB allocations into reserved memory
    UefiCpuPkg/MpInitLib: Prepare SEV-ES guest APs for OS use

   MdeModulePkg/MdeModulePkg.dec                 |    9 +
   OvmfPkg/OvmfPkg.dec                           |    9 +
   UefiCpuPkg/UefiCpuPkg.dec                     |   17 +
   OvmfPkg/OvmfPkgIa32.dsc                       |    6 +
   OvmfPkg/OvmfPkgIa32X64.dsc                    |    6 +
   OvmfPkg/OvmfPkgX64.dsc                        |    6 +
   OvmfPkg/OvmfXen.dsc                           |    1 +
   UefiCpuPkg/UefiCpuPkg.dsc                     |    2 +
   UefiPayloadPkg/UefiPayloadPkgIa32.dsc         |    2 +
   UefiPayloadPkg/UefiPayloadPkgIa32X64.dsc      |    2 +
   OvmfPkg/OvmfPkgX64.fdf                        |    9 +
   MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf       |    2 +
   MdePkg/Library/BaseLib/BaseLib.inf            |    4 +
   OvmfPkg/PlatformPei/PlatformPei.inf           |    7 +
   .../FvbServicesRuntimeDxe.inf                 |    2 +
   OvmfPkg/ResetVector/ResetVector.inf           |    8 +
   OvmfPkg/Sec/SecMain.inf                       |    4 +
   .../DxeCpuExceptionHandlerLib.inf             |    5 +
   .../PeiCpuExceptionHandlerLib.inf             |    5 +
   .../SecPeiCpuExceptionHandlerLib.inf          |    5 +
   .../SmmCpuExceptionHandlerLib.inf             |    5 +
   UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf |    4 +
   UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf |    4 +
   UefiCpuPkg/Library/VmgExitLib/VmgExitLib.inf  |   33 +
   .../Core/DxeIplPeim/X64/VirtualMemory.h       |   12 +-
   MdePkg/Include/Library/BaseLib.h              |   31 +
   MdePkg/Include/Register/Amd/Fam17Msr.h        |   42 +
   MdePkg/Include/Register/Amd/Ghcb.h            |  136 ++
   OvmfPkg/Include/Library/MemEncryptSevLib.h    |   12 +
   .../QemuFlash.h                               |    6 +
   UefiCpuPkg/CpuDxe/CpuGdt.h                    |    4 +-
   UefiCpuPkg/Include/Library/VmgExitLib.h       |  111 ++
   .../CpuExceptionHandlerLib/AMDSevVcCommon.h   |   26 +
   .../CpuExceptionCommon.h                      |    2 +
   UefiCpuPkg/Library/MpInitLib/MpLib.h          |   68 +-
   .../Core/DxeIplPeim/Ia32/DxeLoadFunc.c        |    4 +-
   .../Core/DxeIplPeim/X64/DxeLoadFunc.c         |   11 +-
   .../Core/DxeIplPeim/X64/VirtualMemory.c       |   49 +-
   MdePkg/Library/BaseLib/Ia32/GccInline.c       |   45 +
   MdePkg/Library/BaseLib/X64/GccInline.c        |   47 +
   .../MemEncryptSevLibInternal.c                |   75 +-
   OvmfPkg/PlatformPei/AmdSev.c                  |   82 ++
   OvmfPkg/PlatformPei/MemDetect.c               |   23 +
   .../QemuFlash.c                               |   23 +-
   .../QemuFlashDxe.c                            |   15 +
   .../QemuFlashSmm.c                            |    9 +
   OvmfPkg/Sec/SecMain.c                         |  160 ++-
   UefiCpuPkg/CpuDxe/CpuGdt.c                    |    8 +-
   .../CpuExceptionHandlerLib/AMDSevVcHandler.c  |   29 +
   .../CpuExceptionCommon.c                      |    2 +-
   .../Ia32/ArchAMDSevVcHandler.c                |   24 +
   .../PeiDxeSmmCpuException.c                   |   16 +
   .../SecPeiCpuException.c                      |   16 +
   .../X64/ArchAMDSevVcHandler.c                 | 1237 +++++++++++++++++
   UefiCpuPkg/Library/MpInitLib/DxeMpLib.c       |  114 +-
   UefiCpuPkg/Library/MpInitLib/MpLib.c          |  257 +++-
   UefiCpuPkg/Library/MpInitLib/PeiMpLib.c       |   19 +
   UefiCpuPkg/Library/VmgExitLib/VmgExitLib.c    |  249 ++++
   UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmFuncsArch.c  |    2 +-
   MdePkg/Library/BaseLib/Ia32/VmgExit.nasm      |   37 +
   MdePkg/Library/BaseLib/Ia32/XGetBv.nasm       |   31 +
   MdePkg/Library/BaseLib/X64/VmgExit.nasm       |   32 +
   MdePkg/Library/BaseLib/X64/XGetBv.nasm        |   34 +
   OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm  |  100 ++
   OvmfPkg/ResetVector/Ia32/PageTables64.asm     |  351 ++++-
   OvmfPkg/ResetVector/ResetVector.nasmb         |   20 +
   .../X64/ExceptionHandlerAsm.nasm              |   17 +
   UefiCpuPkg/Library/MpInitLib/Ia32/MpEqu.inc   |    2 +-
   .../Library/MpInitLib/Ia32/MpFuncs.nasm       |   15 +
   UefiCpuPkg/Library/MpInitLib/X64/MpEqu.inc    |    4 +-
   UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm |  370 ++++-
   UefiCpuPkg/Library/VmgExitLib/VmgExitLib.uni  |   15 +
   .../ResetVector/Vtf0/Ia16/Real16ToFlat32.asm  |    9 +
   73 files changed, 4061 insertions(+), 99 deletions(-)
   create mode 100644 UefiCpuPkg/Library/VmgExitLib/VmgExitLib.inf
   create mode 100644 MdePkg/Include/Register/Amd/Ghcb.h
   create mode 100644 UefiCpuPkg/Include/Library/VmgExitLib.h
   create mode 100644 UefiCpuPkg/Library/CpuExceptionHandlerLib/AMDSevVcCommon.h
   create mode 100644 
UefiCpuPkg/Library/CpuExceptionHandlerLib/AMDSevVcHandler.c
   create mode 100644 
UefiCpuPkg/Library/CpuExceptionHandlerLib/Ia32/ArchAMDSevVcHandler.c
   create mode 100644 
UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c
   create mode 100644 UefiCpuPkg/Library/VmgExitLib/VmgExitLib.c
   create mode 100644 MdePkg/Library/BaseLib/Ia32/VmgExit.nasm
   create mode 100644 MdePkg/Library/BaseLib/Ia32/XGetBv.nasm
   create mode 100644 MdePkg/Library/BaseLib/X64/VmgExit.nasm
   create mode 100644 MdePkg/Library/BaseLib/X64/XGetBv.nasm
   create mode 100644 OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm
   create mode 100644 UefiCpuPkg/Library/VmgExitLib/VmgExitLib.uni





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