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Mon, 2 Mar 2020 23:07:35 +0000 X-Mailer: git-send-email 2.17.1 X-Originating-IP: [165.204.77.1] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 79922138-88e7-4437-8a76-08d7befe7ef0 X-MS-TrafficTypeDiagnostic: DM6PR12MB4041:|DM6PR12MB4041: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:10000; X-Forefront-PRVS: 033054F29A X-Forefront-Antispam-Report: SFV:NSPM;SFS:(10009020)(4636009)(376002)(39860400002)(366004)(346002)(396003)(136003)(199004)(189003)(478600001)(86362001)(5660300002)(81156014)(36756003)(6916009)(316002)(4326008)(54906003)(2906002)(6486002)(8936002)(81166006)(8676002)(966005)(956004)(2616005)(30864003)(66476007)(66556008)(7696005)(52116002)(66946007)(186003)(26005)(16526019);DIR:OUT;SFP:1101;SCL:1;SRVR:DM6PR12MB4041;H:DM6PR12MB3163.namprd12.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; Received-SPF: None (protection.outlook.com: amd.com does not designate permitted sender hosts) X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-MS-Exchange-AntiSpam-MessageData: wN2F8v5JmjewjupRG55gvuCt4WKYLqeFSynGunUw0a0RHst6SCL2s6jTKRlxq4yz7ety/qa7vZEaVK4WRlbpEcWdLuJRTdr/WO2hBpRCnqrIo57KqTGDpoyc7lTp6Y95nNPN/61CODWi5emlkLuTjQ== X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 79922138-88e7-4437-8a76-08d7befe7ef0 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Mar 2020 23:07:36.0776 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: jivUDewndMus/kOoTyl7h+AdWirWlQKJrgKC/CnCycOq6DDO8sSw5ZsAPoSY3yGBFuFxEqdI2cRdQIwJsCXLKQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4041 Content-Type: text/plain BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198 To support issuing a VMGEXIT instruction, create a library that can be used to perform GHCB and VMGEXIT related operations and to issue the actual VMGEXIT instruction when using the GHCB. Additionally, two VMGEXIT / MMIO related functions are created to support flash emulation. Flash emulation currently is done by marking the flash area as read-only and taking a nested page fault to perform the emulation of the instruction. However, emulation cannot be performed because there is no instruction decode assist support when SEV-ES is enabled. Provide routines to initiate an MMIO request to perform actual writes to flash. Cc: Eric Dong Cc: Ray Ni Cc: Laszlo Ersek Acked-by: Laszlo Ersek Signed-off-by: Tom Lendacky --- UefiCpuPkg/UefiCpuPkg.dec | 3 + UefiCpuPkg/UefiCpuPkg.dsc | 2 + UefiCpuPkg/Library/VmgExitLib/VmgExitLib.inf | 33 +++ UefiCpuPkg/Include/Library/VmgExitLib.h | 111 +++++++++ UefiCpuPkg/Library/VmgExitLib/VmgExitLib.c | 243 +++++++++++++++++++ UefiCpuPkg/Library/VmgExitLib/VmgExitLib.uni | 15 ++ 6 files changed, 407 insertions(+) create mode 100644 UefiCpuPkg/Library/VmgExitLib/VmgExitLib.inf create mode 100644 UefiCpuPkg/Include/Library/VmgExitLib.h create mode 100644 UefiCpuPkg/Library/VmgExitLib/VmgExitLib.c create mode 100644 UefiCpuPkg/Library/VmgExitLib/VmgExitLib.uni diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec index 2f30bf89615f..795d1c8dedba 100644 --- a/UefiCpuPkg/UefiCpuPkg.dec +++ b/UefiCpuPkg/UefiCpuPkg.dec @@ -53,6 +53,9 @@ [LibraryClasses.IA32, LibraryClasses.X64] ## MpInitLib|Include/Library/MpInitLib.h + ## @libraryclass Provides function to support VMGEXIT processing. + VmgExitLib|Include/Library/VmgExitLib.h + [Guids] gUefiCpuPkgTokenSpaceGuid = { 0xac05bf33, 0x995a, 0x4ed4, { 0xaa, 0xb8, 0xef, 0x7a, 0xe8, 0xf, 0x5c, 0xb0 }} gMsegSmramGuid = { 0x5802bce4, 0xeeee, 0x4e33, { 0xa1, 0x30, 0xeb, 0xad, 0x27, 0xf0, 0xe4, 0x39 }} diff --git a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc index d28cb5cccb52..997840452218 100644 --- a/UefiCpuPkg/UefiCpuPkg.dsc +++ b/UefiCpuPkg/UefiCpuPkg.dsc @@ -56,6 +56,7 @@ [LibraryClasses] PeCoffGetEntryPointLib|MdePkg/Library/BasePeCoffGetEntryPointLib/BasePeCoffGetEntryPointLib.inf PeCoffExtraActionLib|MdePkg/Library/BasePeCoffExtraActionLibNull/BasePeCoffExtraActionLibNull.inf TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf + VmgExitLib|UefiCpuPkg/Library/VmgExitLib/VmgExitLib.inf [LibraryClasses.common.SEC] PlatformSecLib|UefiCpuPkg/Library/PlatformSecLibNull/PlatformSecLibNull.inf @@ -136,6 +137,7 @@ [Components.IA32, Components.X64] UefiCpuPkg/Library/SmmCpuPlatformHookLibNull/SmmCpuPlatformHookLibNull.inf UefiCpuPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.inf UefiCpuPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLibStm.inf + UefiCpuPkg/Library/VmgExitLib/VmgExitLib.inf UefiCpuPkg/PiSmmCommunication/PiSmmCommunicationPei.inf UefiCpuPkg/PiSmmCommunication/PiSmmCommunicationSmm.inf UefiCpuPkg/SecCore/SecCore.inf diff --git a/UefiCpuPkg/Library/VmgExitLib/VmgExitLib.inf b/UefiCpuPkg/Library/VmgExitLib/VmgExitLib.inf new file mode 100644 index 000000000000..6acfa779e75a --- /dev/null +++ b/UefiCpuPkg/Library/VmgExitLib/VmgExitLib.inf @@ -0,0 +1,33 @@ +## @file +# VMGEXIT Support Library. +# +# Copyright (c) 2019, Advanced Micro Devices, Inc. All rights reserved.
+# SPDX-License-Identifier: BSD-2-Clause-Patent +# +## + +[Defines] + INF_VERSION = 0x00010005 + BASE_NAME = VmgExitLib + MODULE_UNI_FILE = VmgExitLib.uni + FILE_GUID = 3cd7368f-ef9b-4a9b-9571-2ed93813677e + MODULE_TYPE = BASE + VERSION_STRING = 1.0 + LIBRARY_CLASS = VmgExitLib + +# +# The following information is for reference only and not required by the build tools. +# +# VALID_ARCHITECTURES = IA32 X64 +# + +[Sources] + VmgExitLib.c + +[Packages] + MdePkg/MdePkg.dec + UefiCpuPkg/UefiCpuPkg.dec + +[LibraryClasses] + BaseLib + diff --git a/UefiCpuPkg/Include/Library/VmgExitLib.h b/UefiCpuPkg/Include/Library/VmgExitLib.h new file mode 100644 index 000000000000..602b213f1f63 --- /dev/null +++ b/UefiCpuPkg/Include/Library/VmgExitLib.h @@ -0,0 +1,111 @@ +/** @file + Public header file for the VMGEXIT Support library class. + + This library class defines some routines used when invoking the VMGEXIT + instruction in support of SEV-ES. + + Copyright (c) 2019, Advanced Micro Devices, Inc. All rights reserved.
+ SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + +#ifndef __VMG_EXIT_LIB_H__ +#define __VMG_EXIT_LIB_H__ + +#include + + +/** + Perform VMGEXIT. + + Sets the necessary fields of the GHCB, invokes the VMGEXIT instruction and + then handles the return actions. + + @param[in] GHCB A pointer to the GHCB + @param[in] ExitCode VMGEXIT code to be assigned to the SwExitCode field of + the GHCB. + @param[in] ExitInfo1 VMGEXIT information to be assigned to the SwExitInfo1 + field of the GHCB. + @param[in] ExitInfo2 VMGEXIT information to be assigned to the SwExitInfo2 + field of the GHCB. + + @retval 0 VMGEXIT succeeded. + @retval Others VMGEXIT processing did not succeed. Exception number to + be issued. + +**/ +UINTN +EFIAPI +VmgExit ( + GHCB *Ghcb, + UINT64 ExitCode, + UINT64 ExitInfo1, + UINT64 ExitInfo2 + ); + +/** + Perform pre-VMGEXIT initialization/preparation. + + Performs the necessary steps in preparation for invoking VMGEXIT. + + @param[in] GHCB A pointer to the GHCB + +**/ +VOID +EFIAPI +VmgInit ( + GHCB *Ghcb + ); + +/** + Perform post-VMGEXIT cleanup. + + Performs the necessary steps to cleanup after invoking VMGEXIT. + + @param[in] GHCB A pointer to the GHCB + +**/ +VOID +EFIAPI +VmgDone ( + GHCB *Ghcb + ); + +#define VMGMMIO_READ False +#define VMGMMIO_WRITE True + +/** + Perform MMIO write of a buffer to a non-MMIO marked range. + + Performs an MMIO write without taking a #VC. This is useful + for Flash devices, which are marked read-only. + + @param[in] UINT8 A pointer to the destination buffer + @param[in] UINTN The immediate value to write + @param[in] UINTN Number of bytes to write + +**/ +VOID +EFIAPI +VmgMmioWrite ( + UINT8 *Dest, + UINT8 *Src, + UINTN Bytes + ); + +/** + Issue the GHCB set AP Jump Table VMGEXIT. + + Performs a VMGEXIT using the GHCB AP Jump Table exit code to save the + AP Jump Table address with the hypervisor for retrieval at a later time. + + @param[in] EFI_PHYSICAL_ADDRESS Physical address of the AP Jump Table + +**/ +UINTN +EFIAPI +VmgExitSetAPJumpTable ( + EFI_PHYSICAL_ADDRESS Address + ); + +#endif diff --git a/UefiCpuPkg/Library/VmgExitLib/VmgExitLib.c b/UefiCpuPkg/Library/VmgExitLib/VmgExitLib.c new file mode 100644 index 000000000000..6afff51ad06b --- /dev/null +++ b/UefiCpuPkg/Library/VmgExitLib/VmgExitLib.c @@ -0,0 +1,243 @@ +/** @file + VMGEXIT Support Library. + + Copyright (c) 2019, Advanced Micro Devices, Inc. All rights reserved.
+ SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + +#include +#include +#include +#include +#include + +STATIC +UINT64 +VmgExitErrorCheck ( + GHCB *Ghcb + ) +{ + GHCB_EVENT_INJECTION Event; + GHCB_EXIT_INFO ExitInfo; + UINT64 Status; + + ExitInfo.Uint64 = Ghcb->SaveArea.SwExitInfo1; + ASSERT ((ExitInfo.Elements.Lower32Bits == 0) || + (ExitInfo.Elements.Lower32Bits == 1)); + + Status = 0; + if (ExitInfo.Elements.Lower32Bits == 0) { + return Status; + } + + if (ExitInfo.Elements.Lower32Bits == 1) { + ASSERT (Ghcb->SaveArea.SwExitInfo2 != 0); + + // Check that the return event is valid + Event.Uint64 = Ghcb->SaveArea.SwExitInfo2; + if (Event.Elements.Valid && + Event.Elements.Type == GHCB_EVENT_INJECTION_TYPE_EXCEPTION) { + switch (Event.Elements.Vector) { + case GP_EXCEPTION: + case UD_EXCEPTION: + // Use returned event as return code + Status = Event.Uint64; + } + } + } + + if (Status == 0) { + GHCB_EVENT_INJECTION Event; + + Event.Uint64 = 0; + Event.Elements.Vector = GP_EXCEPTION; + Event.Elements.Type = GHCB_EVENT_INJECTION_TYPE_EXCEPTION; + Event.Elements.Valid = 1; + + Status = Event.Uint64; + } + + return Status; +} + +/** + Perform VMGEXIT. + + Sets the necessary fields of the GHCB, invokes the VMGEXIT instruction and + then handles the return actions. + + @param[in] GHCB A pointer to the GHCB + @param[in] ExitCode VMGEXIT code to be assigned to the SwExitCode field of + the GHCB. + @param[in] ExitInfo1 VMGEXIT information to be assigned to the SwExitInfo1 + field of the GHCB. + @param[in] ExitInfo2 VMGEXIT information to be assigned to the SwExitInfo2 + field of the GHCB. + + @retval 0 VMGEXIT succeeded. + @retval Others VMGEXIT processing did not succeed. Exception number to + be issued. + +**/ +UINT64 +EFIAPI +VmgExit ( + GHCB *Ghcb, + UINT64 ExitCode, + UINT64 ExitInfo1, + UINT64 ExitInfo2 + ) +{ + Ghcb->SaveArea.SwExitCode = ExitCode; + Ghcb->SaveArea.SwExitInfo1 = ExitInfo1; + Ghcb->SaveArea.SwExitInfo2 = ExitInfo2; + + // + // Guest memory is used for the guest-hypervisor communication, so fence + // the invocation of the VMGEXIT instruction to ensure GHCB accesses are + // synchronized properly. + // + MemoryFence (); + AsmVmgExit (); + MemoryFence (); + + return VmgExitErrorCheck (Ghcb); +} + +/** + Perform pre-VMGEXIT initialization/preparation. + + Performs the necessary steps in preparation for invoking VMGEXIT. + + @param[in] GHCB A pointer to the GHCB + +**/ +VOID +EFIAPI +VmgInit ( + GHCB *Ghcb + ) +{ + SetMem (&Ghcb->SaveArea, sizeof (Ghcb->SaveArea), 0); +} + +/** + Perform post-VMGEXIT cleanup. + + Performs the necessary steps to cleanup after invoking VMGEXIT. + + @param[in] GHCB A pointer to the GHCB + +**/ +VOID +EFIAPI +VmgDone ( + GHCB *Ghcb + ) +{ +} + +STATIC +UINTN +EFIAPI +VmgMmio ( + UINT8 *MmioAddress, + UINT8 *Buffer, + UINTN Bytes, + BOOLEAN Write + ) +{ + UINT64 MmioOp, ExitInfo1, ExitInfo2, Status; + GHCB *Ghcb; + MSR_SEV_ES_GHCB_REGISTER Msr; + + Msr.GhcbPhysicalAddress = AsmReadMsr64 (MSR_SEV_ES_GHCB); + Ghcb = Msr.Ghcb; + + VmgInit (Ghcb); + + if (Write) { + MmioOp = SvmExitMmioWrite; + } else { + MmioOp = SvmExitMmioRead; + } + + ExitInfo1 = (UINT64) (UINTN) MmioAddress; + ExitInfo2 = Bytes; + + if (Write) { + CopyMem (Ghcb->SharedBuffer, Buffer, Bytes); + } + + Ghcb->SaveArea.SwScratch = (UINT64) (UINTN) Ghcb->SharedBuffer; + Status = VmgExit (Ghcb, MmioOp, ExitInfo1, ExitInfo2); + if (Status != 0) { + return Status; + } + + if (!Write) { + CopyMem (Buffer, Ghcb->SharedBuffer, Bytes); + } + + VmgDone (Ghcb); + + return 0; +} + +/** + Perform MMIO write of a buffer to a non-MMIO marked range. + + Performs an MMIO write without taking a #VC. This is useful + for Flash devices, which are marked read-only. + + @param[in] UINT8 A pointer to the destination buffer + @param[in] UINTN The immediate value to write + @param[in] UINTN Number of bytes to write + +**/ +VOID +EFIAPI +VmgMmioWrite ( + UINT8 *Dest, + UINT8 *Src, + UINTN Bytes + ) +{ + VmgMmio (Dest, Src, Bytes, TRUE); +} + +/** + Issue the GHCB set AP Jump Table VMGEXIT. + + Performs a VMGEXIT using the GHCB AP Jump Table exit code to save the + AP Jump Table address with the hypervisor for retrieval at a later time. + + @param[in] EFI_PHYSICAL_ADDRESS Physical address of the AP Jump Table + +**/ +UINTN +EFIAPI +VmgExitSetAPJumpTable ( + EFI_PHYSICAL_ADDRESS Address + ) +{ + UINT64 ExitInfo1, ExitInfo2, Status; + GHCB *Ghcb; + MSR_SEV_ES_GHCB_REGISTER Msr; + + Msr.GhcbPhysicalAddress = AsmReadMsr64 (MSR_SEV_ES_GHCB); + Ghcb = Msr.Ghcb; + + VmgInit (Ghcb); + + ExitInfo1 = 0; + ExitInfo2 = (UINT64) (UINTN) Address; + + Status = VmgExit (Ghcb, SvmExitApJumpTable, ExitInfo1, ExitInfo2); + + VmgDone (Ghcb); + + return Status; +} + diff --git a/UefiCpuPkg/Library/VmgExitLib/VmgExitLib.uni b/UefiCpuPkg/Library/VmgExitLib/VmgExitLib.uni new file mode 100644 index 000000000000..e8656aae4726 --- /dev/null +++ b/UefiCpuPkg/Library/VmgExitLib/VmgExitLib.uni @@ -0,0 +1,15 @@ +// /** @file +// VMGEXIT support library instance. +// +// VMGEXIT support library instance. +// +// Copyright (c) 2019, Advanced Micro Devices, Inc. All rights reserved.
+// SPDX-License-Identifier: BSD-2-Clause-Patent +// +// **/ + + +#string STR_MODULE_ABSTRACT #language en-US "VMGEXIT Support Library." + +#string STR_MODULE_DESCRIPTION #language en-US "VMGEXIT Support Library." + -- 2.17.1