[edk2-devel] [PATCH v7 00/43] SEV-ES guest support
Ni, Ray
ray.ni at intel.com
Mon May 11 05:24:48 UTC 2020
Tom,
I agree with the first issue. I am not quite clear on the second one.
SourceLevelDebugPkg provides source level debugging support early in SEC
through SourceLevelDebugPkg\Library\DebugAgent\SecPeiDebugAgent\.
It hooks all Intel SDM defined exceptions. It hooks INT32 additionally to support breaking from HOST.
It doesn't use CpuExceptionLib because it hooks in very early SEC phase.
Can you use the same way?
Thanks,
Ray
From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Andrew Fish via groups.io
Sent: Sunday, May 10, 2020 3:10 AM
To: devel at edk2.groups.io; thomas.lendacky at amd.com
Cc: Ni, Ray <ray.ni at intel.com>; Justen, Jordan L <jordan.l.justen at intel.com>; Laszlo Ersek <lersek at redhat.com>; Ard Biesheuvel <ard.biesheuvel at linaro.org>; Kinney, Michael D <michael.d.kinney at intel.com>; Gao, Liming <liming.gao at intel.com>; Dong, Eric <eric.dong at intel.com>; Brijesh Singh <brijesh.singh at amd.com>; You, Benjamin <benjamin.you at intel.com>; Bi, Dandan <dandan.bi at intel.com>; Dong, Guo <guo.dong at intel.com>; Wu, Hao A <hao.a.wu at intel.com>; Wang, Jian J <jian.j.wang at intel.com>; Ma, Maurice <maurice.ma at intel.com>
Subject: Re: [edk2-devel] [PATCH v7 00/43] SEV-ES guest support
On May 9, 2020, at 7:34 AM, Lendacky, Thomas <thomas.lendacky at amd.com<mailto:thomas.lendacky at amd.com>> wrote:
On 5/9/20 1:44 AM, Ni, Ray wrote:
Tom,
Hi Ray,
I have a bit concern on your change that directly modifies CpuExceptionHandlerLib to handle
exception #29. Today's CpuExceptionHandlerLib simplify dumps the exception context for
every exception. Any component which wants to do specific handling of certain exceptions
should call RegisterCpuInterruptHandler(). Such as code in CpuDxe driver:
if (HEAP_GUARD_NONSTOP_MODE || NULL_DETECTION_NONSTOP_MODE) {
RegisterCpuInterruptHandler (EXCEPT_IA32_DEBUG, DebugExceptionHandler);
RegisterCpuInterruptHandler (EXCEPT_IA32_PAGE_FAULT, PageFaultExceptionHandler);
}
Is it possible for your feature to follow the same pattern?
There are two problems:
The first is that RegisterCpuInterruptHandler() is not implemented for both the SEC and PEI phases, so it is not currently possible to register a handler that early.
The second is that I need to be able to propagate an exception request from the hypervisor. With the current implementation there doesn't appear to be an easy way to perform this propagation.
If there's a way to accomplish both of the above I wouldn't be opposed to using RegisterCpuInterruptHandler() as long as there are no #VCs that can occur between initializing exception handling and and registering the #VC handler.
Thomas,
As you point out it is tricky dealing with XIP code. You can't have globals that you can write and generally you use a PEI service to look tings up, the most common thing being using a HOB. But SEC has no services and I'm not sure you really want to be calling into the PEI Core on a random exception.
Here are the best options that popped into my head after reading your email
1) IDT in RAM
If your code populates the IDT the IDTR gives you access to the address of the IDTR via an instruction. The PI Spec reserves IDT - sizeof (UNITN) for a cached copy of the PEI Services Table, but otther than that you are good to go. It should be possible to have a global so you can have the table required to implement RegisterCpuInterruptHandler(). There might be some usage of IDT - ( 2* sizeof(UINTN)), I know I'm guilty, so storing data after the IDT would be a good option. In general if your code allocates the memory for the IDT then you can treat the IDT as part of your private context data structure and that gives you access
2) IDT in ROM.
For this it seems like you need a library to link in to the CpuExceptionHandlerLib that allows you to override the handler. If CpuInterruptHandlerOverride() returns NULL you do the current behavior if not NULL then you call the returned handler.
EFI_CPU_INTERRUPT_HANDLER
EFIAPI
OverrideCpuInterruptHandler (
IN EFI_EXCEPTION_TYPE InterruptType
);
Thanks,
Andrew Fish
PS Off topic, but it would also be useful to have a library that overrides the state dump display. For example using Xcode you can always display a stack frame from the exception handler.
Thanks,
Tom
Thanks,
Ray
-----Original Message-----
From: Tom Lendacky <thomas.lendacky at amd.com<mailto:thomas.lendacky at amd.com>>
Sent: Saturday, May 9, 2020 3:16 AM
To: devel at edk2.groups.io<mailto:devel at edk2.groups.io>
Cc: Justen, Jordan L <jordan.l.justen at intel.com<mailto:jordan.l.justen at intel.com>>; Laszlo Ersek <lersek at redhat.com<mailto:lersek at redhat.com>>; Ard Biesheuvel
<ard.biesheuvel at linaro.org<mailto:ard.biesheuvel at linaro.org>>; Kinney, Michael D <michael.d.kinney at intel.com<mailto:michael.d.kinney at intel.com>>; Gao, Liming <liming.gao at intel.com<mailto:liming.gao at intel.com>>; Dong,
Eric <eric.dong at intel.com<mailto:eric.dong at intel.com>>; Ni, Ray <ray.ni at intel.com<mailto:ray.ni at intel.com>>; Brijesh Singh <brijesh.singh at amd.com<mailto:brijesh.singh at amd.com>>; You, Benjamin
<benjamin.you at intel.com<mailto:benjamin.you at intel.com>>; Bi, Dandan <dandan.bi at intel.com<mailto:dandan.bi at intel.com>>; Dong, Guo <guo.dong at intel.com<mailto:guo.dong at intel.com>>; Wu, Hao A
<hao.a.wu at intel.com<mailto:hao.a.wu at intel.com>>; Wang, Jian J <jian.j.wang at intel.com<mailto:jian.j.wang at intel.com>>; Ma, Maurice <maurice.ma at intel.com<mailto:maurice.ma at intel.com>>
Subject: Re: [PATCH v7 00/43] SEV-ES guest support
I was able to use the pull request method that Laszlo documented and fixed
up all of the issues identified by the VS compiler.
An additional change I'm planning to make for the next version (v8) of the
patches is to create a NULL library instance of the VmgExitLib that will
also include the #VC handler function. This will reduce the amount of code
associated with this feature for platforms that don't use/support SEV-ES.
Laszlo, this will mean that I will introduce a version of the VmgExitLib
under OvmfPkg that will provide the majority of the functionality that is
present today in UefiCpuPkg. In essence, the functionality in v7 patches 8
and 11 - 25 will now live under OvmfPkg instead of UefiCpuPkg. I think
this is the better way to do this. Let me know if you have any concerns.
Thanks,
Tom
On 4/22/20 12:41 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://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.amd.com%2Fsystem%2Ffiles%2FTechDocs%2F24593.pdf&data=02%7C01%7Cthomas.lendacky%40amd.com%7Cf5d7875dfcf54e45c42208d7f3e4676b%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637246036118033165&sdata=H74fQl1n2sXzCMSoGm1tGOKc5epMtVkGJFCidwLMl5c%3D&reserved=0
[2] 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%7Cf5d7875dfcf54e45c42208d7f3e4676b%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637246036118033165&sdata=EwW9575nJMaWxizo2XrLHjrbUMJIB0WFTDLjwy%2BM%2F4k%3D&reserved=0
---
These patches are based on commit:
be7295b36405 (".python/SpellCheck: Increase SpellCheck plugin max failures")
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://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FAMDESE%2Fovmf%2Ftree%2Fsev-es-v14&data=02%7C01%7Cthomas.lendacky%40amd.com%7Cf5d7875dfcf54e45c42208d7f3e4676b%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637246036118033165&sdata=U8fIzb%2F4A8WBaiVbScxUuGDw22kyxxnRP5olSyTedvE%3D&reserved=0
Cc: Ard Biesheuvel <ard.biesheuvel at linaro.org<mailto:ard.biesheuvel at linaro.org>>
Cc: Benjamin You <benjamin.you at intel.com<mailto:benjamin.you at intel.com>>
Cc: Dandan Bi <dandan.bi at intel.com<mailto:dandan.bi at intel.com>>
Cc: Eric Dong <eric.dong at intel.com<mailto:eric.dong at intel.com>>
Cc: Guo Dong <guo.dong at intel.com<mailto:guo.dong at intel.com>>
Cc: Hao A Wu <hao.a.wu at intel.com<mailto:hao.a.wu at intel.com>>
Cc: Jian J Wang <jian.j.wang at intel.com<mailto:jian.j.wang at intel.com>>
Cc: Jordan Justen <jordan.l.justen at intel.com<mailto:jordan.l.justen at intel.com>>
Cc: Laszlo Ersek <lersek at redhat.com<mailto:lersek at redhat.com>>
Cc: Liming Gao <liming.gao at intel.com<mailto:liming.gao at intel.com>>
Cc: Maurice Ma <maurice.ma at intel.com<mailto:maurice.ma at intel.com>>
Cc: Michael D Kinney <michael.d.kinney at intel.com<mailto:michael.d.kinney at intel.com>>
Cc: Ray Ni <ray.ni at intel.com<mailto:ray.ni at intel.com>>
Changes since v6:
- Add function comments to all functions, including local functions
- Add function parameter direction to all functions (in/out)
- Add support for MMIO MOVZX/MOVSX instructions
- Ensure the per-CPU variable page remains encrypted
- Coding-style fixes as identified by Ecc
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 (43):
MdeModulePkg: Create PCDs to be used in support of SEV-ES
UefiCpuPkg: Create PCD 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 | 13 +
UefiCpuPkg/CpuDxe/CpuGdt.h | 4 +-
UefiCpuPkg/Include/Library/VmgExitLib.h | 117 ++
.../CpuExceptionHandlerLib/AMDSevVcCommon.h | 49 +
.../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 | 57 +-
MdePkg/Library/BaseLib/Ia32/GccInline.c | 45 +
MdePkg/Library/BaseLib/X64/GccInline.c | 47 +
.../MemEncryptSevLibInternal.c | 75 +-
OvmfPkg/PlatformPei/AmdSev.c | 89 +
OvmfPkg/PlatformPei/MemDetect.c | 23 +
.../QemuFlash.c | 23 +-
.../QemuFlashDxe.c | 22 +
.../QemuFlashSmm.c | 16 +
OvmfPkg/Sec/SecMain.c | 188 +-
UefiCpuPkg/CpuDxe/CpuGdt.c | 8 +-
.../CpuExceptionHandlerLib/AMDSevVcHandler.c | 40 +
.../CpuExceptionCommon.c | 2 +-
.../Ia32/ArchAMDSevVcHandler.c | 38 +
.../PeiDxeSmmCpuException.c | 16 +
.../SecPeiCpuException.c | 16 +
.../X64/ArchAMDSevVcHandler.c | 1699 +++++++++++++++++
UefiCpuPkg/Library/MpInitLib/DxeMpLib.c | 113 +-
UefiCpuPkg/Library/MpInitLib/MpLib.c | 265 ++-
UefiCpuPkg/Library/MpInitLib/PeiMpLib.c | 19 +
UefiCpuPkg/Library/VmgExitLib/VmgExitLib.c | 293 +++
UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmFuncsArch.c | 2 +-
MdeModulePkg/MdeModulePkg.uni | 8 +
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 | 350 +++-
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 +
UefiCpuPkg/UefiCpuPkg.uni | 11 +
75 files changed, 4707 insertions(+), 102 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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