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From: "Lendacky, Thomas" <thomas.lendacky@amd.com>
To: "devel@edk2.groups.io" <devel@edk2.groups.io>
Cc: Jordan Justen <jordan.l.justen@intel.com>,
	Laszlo Ersek <lersek@redhat.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Michael D Kinney <michael.d.kinney@intel.com>,
	Liming Gao <liming.gao@intel.com>,
	Eric Dong <eric.dong@intel.com>, Ray Ni <ray.ni@intel.com>,
	"Singh, Brijesh" <brijesh.singh@amd.com>
Subject: [RFC PATCH v2 21/44] MdePkg: Add support for the XGETBV instruction
Date: Thu, 19 Sep 2019 19:52:48 +0000	[thread overview]
Message-ID: <eed51194bf1005d701364cd02b08d535049b06fe.1568922729.git.thomas.lendacky@amd.com> (raw)
In-Reply-To: <cover.1568922728.git.thomas.lendacky@amd.com>

From: Tom Lendacky <thomas.lendacky@amd.com>

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198

Under SEV-ES, a CPUID instruction requires the current value of the XCR0
register. In order to retrieve that value, the XGETBV instruction needs
to be executed.

Provide the necessary support to execute the XGETBV instruction.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
 MdePkg/Library/BaseLib/BaseLib.inf      |  2 ++
 MdePkg/Include/Library/BaseLib.h        | 16 ++++++++++++
 MdePkg/Library/BaseLib/Ia32/GccInline.c | 28 ++++++++++++++++++++
 MdePkg/Library/BaseLib/X64/GccInline.c  | 30 ++++++++++++++++++++++
 MdePkg/Library/BaseLib/Ia32/XGetBv.nasm | 31 ++++++++++++++++++++++
 MdePkg/Library/BaseLib/X64/XGetBv.nasm  | 34 +++++++++++++++++++++++++
 6 files changed, 141 insertions(+)
 create mode 100644 MdePkg/Library/BaseLib/Ia32/XGetBv.nasm
 create mode 100644 MdePkg/Library/BaseLib/X64/XGetBv.nasm

diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf
index 14b3f5721101..ea3e284bf8bf 100644
--- a/MdePkg/Library/BaseLib/BaseLib.inf
+++ b/MdePkg/Library/BaseLib/BaseLib.inf
@@ -153,6 +153,7 @@ [Sources.Ia32]
   Ia32/EnableCache.c | MSFT
   Ia32/DisableCache.c | MSFT
   Ia32/VmgExit.nasm | MSFT
+  Ia32/XGetBv.nasm | MSFT
 
 
   Ia32/GccInline.c | GCC
@@ -288,6 +289,7 @@ [Sources.X64]
   X64/ReadCr0.nasm| MSFT
   X64/ReadEflags.nasm| MSFT
   X64/VmgExit.nasm | MSFT
+  X64/XGetBv.nasm | MSFT
 
 
   X64/Non-existing.c
diff --git a/MdePkg/Include/Library/BaseLib.h b/MdePkg/Include/Library/BaseLib.h
index 80bd5cf57a72..362bc2e05dbc 100644
--- a/MdePkg/Include/Library/BaseLib.h
+++ b/MdePkg/Include/Library/BaseLib.h
@@ -7893,6 +7893,22 @@ AsmVmgExit (
   VOID
   );
 
+/**
+  Executes a XGETBV instruction
+
+  Executes a XGETBV instruction. This function is only available on IA-32 and
+  x64.
+
+  @param[in] Index        Extended control register index
+
+  @retval                 The current value of the extended control register
+**/
+UINT64
+EFIAPI
+AsmXGetBv (
+  IN UINT32  Index
+  );
+
 
 /**
   Patch the immediate operand of an IA32 or X64 instruction such that the byte,
diff --git a/MdePkg/Library/BaseLib/Ia32/GccInline.c b/MdePkg/Library/BaseLib/Ia32/GccInline.c
index 55d2e12bcdc9..9db5e48d9899 100644
--- a/MdePkg/Library/BaseLib/Ia32/GccInline.c
+++ b/MdePkg/Library/BaseLib/Ia32/GccInline.c
@@ -1780,3 +1780,31 @@ AsmVmgExit (
 }
 
 
+/**
+  Executes a XGETBV instruction
+
+  Executes a XGETBV instruction. This function is only available on IA-32 and
+  x64.
+
+  @param[in] Index        Extended control register index
+
+  @retval                 The current value of the extended control register
+**/
+UINT64
+EFIAPI
+AsmXGetBv (
+  IN UINT32 Index
+  )
+{
+  UINT64 Data;
+
+  __asm__ __volatile__ (
+    "xgetbv"
+    : "=A" (Data)
+    : "c"  (Index)
+    );
+
+  return Data;
+}
+
+
diff --git a/MdePkg/Library/BaseLib/X64/GccInline.c b/MdePkg/Library/BaseLib/X64/GccInline.c
index 17539caa0798..0169382978ac 100644
--- a/MdePkg/Library/BaseLib/X64/GccInline.c
+++ b/MdePkg/Library/BaseLib/X64/GccInline.c
@@ -1815,3 +1815,33 @@ AsmVmgExit (
 }
 
 
+/**
+  Executes a XGETBV instruction
+
+  Executes a XGETBV instruction. This function is only available on IA-32 and
+  x64.
+
+  @param[in] Index        Extended control register index
+
+  @retval                 The current value of the extended control register
+**/
+UINT64
+EFIAPI
+AsmXGetBv (
+  IN UINT32 Index
+  )
+{
+  UINT32 LowData;
+  UINT32 HighData;
+
+  __asm__ __volatile__ (
+    "xgetbv"
+    : "=a" (LowData),
+      "=d" (HighData)
+    : "c"  (Index)
+    );
+
+  return (((UINT64)HighData) << 32) | LowData;
+}
+
+
diff --git a/MdePkg/Library/BaseLib/Ia32/XGetBv.nasm b/MdePkg/Library/BaseLib/Ia32/XGetBv.nasm
new file mode 100644
index 000000000000..8d14ba03d4a8
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/XGetBv.nasm
@@ -0,0 +1,31 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2019, Advanced Micro Device, Inc. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+;   XGetBv.Asm
+;
+; Abstract:
+;
+;   AsmXgetBv function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; AsmXGetBv (
+;   IN UINT32  Index
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmXGetBv)
+ASM_PFX(AsmXGetBv):
+    mov     ecx, [esp + 4]
+    xgetbv
+    ret
diff --git a/MdePkg/Library/BaseLib/X64/XGetBv.nasm b/MdePkg/Library/BaseLib/X64/XGetBv.nasm
new file mode 100644
index 000000000000..239ecb58ab13
--- /dev/null
+++ b/MdePkg/Library/BaseLib/X64/XGetBv.nasm
@@ -0,0 +1,34 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2019, Advanced Micro Device, Inc. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+;   XGetBv.Asm
+;
+; Abstract:
+;
+;   AsmXgetBv function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; AsmXGetBv (
+;   IN UINT32  Index
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmXGetBv)
+ASM_PFX(AsmXGetBv):
+    xgetbv
+    shl     rdx, 0x20
+    or      rax, rdx
+    ret
+
-- 
2.17.1


  parent reply	other threads:[~2019-09-19 19:52 UTC|newest]

Thread overview: 106+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-19 19:52 [RFC PATCH v2 00/44] SEV-ES guest support Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 01/44] MdePkg: Create PCDs to be used in support of SEV-ES Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 02/44] OvmfPkg/MemEncryptSevLib: Add an SEV-ES guest indicator function Lendacky, Thomas
2019-09-24 11:53   ` [edk2-devel] " Laszlo Ersek
2019-09-19 19:52 ` [RFC PATCH v2 03/44] OvmfPkg: Add support to perform SEV-ES initialization Lendacky, Thomas
2019-09-24 11:59   ` [edk2-devel] " Laszlo Ersek
2019-09-24 14:43     ` Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 04/44] OvmfPkg/ResetVector: Add support for a 32-bit SEV check Lendacky, Thomas
2019-09-24 13:42   ` [edk2-devel] " Laszlo Ersek
2019-09-24 13:50     ` Laszlo Ersek
2019-09-24 18:57     ` Lendacky, Thomas
2019-09-25 14:45       ` Laszlo Ersek
2019-09-30 19:29       ` Laszlo Ersek
2019-09-30 19:55         ` Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 05/44] MdePkg: Add the MSR definition for the GHCB register Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 06/44] OvmfPkg: Create a GHCB page for use during Sec phase Lendacky, Thomas
2019-09-25  8:09   ` [edk2-devel] " Laszlo Ersek
2019-09-25 17:36     ` Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 07/44] OvmfPkg/PlatformPei: Reserve GHCB-related areas if S3 is supported Lendacky, Thomas
2019-09-25  8:27   ` [edk2-devel] " Laszlo Ersek
2019-09-25 17:52     ` Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 08/44] OvmfPkg: Create GHCB pages for use during Pei and Dxe phase Lendacky, Thomas
2019-09-26  8:00   ` [edk2-devel] " Laszlo Ersek
2019-09-26 14:00     ` Lendacky, Thomas
2019-09-30 18:52       ` Laszlo Ersek
2019-09-30 19:49         ` Lendacky, Thomas
2019-09-30 19:12       ` Laszlo Ersek
2019-09-30 19:51         ` Lendacky, Thomas
2019-10-02 10:23   ` Laszlo Ersek
2019-10-02 14:43     ` Lendacky, Thomas
2019-10-02 15:55       ` Laszlo Ersek
2019-09-19 19:52 ` [RFC PATCH v2 09/44] MdeModulePkg/DxeIplPeim: Support GHCB pages when creating page tables Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 10/44] OvmfPkg: A per-CPU variable area for #VC usage Lendacky, Thomas
2019-09-26  8:17   ` [edk2-devel] " Laszlo Ersek
2019-09-26 14:46     ` Lendacky, Thomas
2019-09-30 19:15       ` Laszlo Ersek
2019-09-30 19:52         ` Lendacky, Thomas
2019-10-02 11:51   ` Laszlo Ersek
2019-10-02 16:06     ` Lendacky, Thomas
2019-10-03  9:06       ` Laszlo Ersek
2019-09-19 19:52 ` [RFC PATCH v2 11/44] OvmfPkg/PlatformPei: Move early GDT into ram when SEV-ES is enabled Lendacky, Thomas
2019-10-02 12:05   ` [edk2-devel] " Laszlo Ersek
2019-10-02 16:10     ` Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 12/44] MdePkg: Add a structure definition for the GHCB Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 13/44] MdePkg/BaseLib: Add support for the VMGEXIT instruction Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 14/44] UefiCpuPkg: Implement library support for VMGEXIT Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 15/44] UefiCpuPkg/CpuExceptionHandler: Add base support for the #VC exception Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 16/44] OvmfPkg/MemEncryptSevLib: Make MemEncryptSevLib available during SEC Lendacky, Thomas
2019-10-02 12:24   ` [edk2-devel] " Laszlo Ersek
2019-10-02 12:30     ` Laszlo Ersek
2019-10-02 16:16       ` Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 17/44] UefiCpuPkg/CpuExceptionHandler: Add #VC exception handling for Sec phase Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 18/44] OvmfPkg/Sec: Enable cache early to speed up booting Lendacky, Thomas
2019-10-02 12:31   ` [edk2-devel] " Laszlo Ersek
2019-09-19 19:52 ` [RFC PATCH v2 19/44] UefiCpuPkg/CpuExceptionHandler: Add support for IOIO_PROT NAE events Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 20/44] UefiCpuPkg/CpuExceptionHandler: Support string IO " Lendacky, Thomas
2019-09-19 19:52 ` Lendacky, Thomas [this message]
2019-09-19 19:52 ` [RFC PATCH v2 22/44] UefiCpuPkg/CpuExceptionHandler: Add support for CPUID " Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 23/44] UefiCpuPkg/CpuExceptionHandler: Add support for MSR_PROT " Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 24/44] UefiCpuPkg/CpuExceptionHandler: Add support for NPF NAE events (MMIO) Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 25/44] UefiCpuPkg/CpuExceptionHandler: Add support for WBINVD NAE events Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 26/44] UefiCpuPkg/CpuExceptionHandler: Add support for RDTSC " Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 27/44] UefiCpuPkg/CpuExceptionHandler: Add support for RDPMC " Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 28/44] UefiCpuPkg/CpuExceptionHandler: Add support for INVD " Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 29/44] UefiCpuPkg/CpuExceptionHandler: Add support for VMMCALL " Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 30/44] UefiCpuPkg/CpuExceptionHandler: Add support for RDTSCP " Lendacky, Thomas
2019-09-19 19:52 ` [RFC PATCH v2 31/44] UefiCpuPkg/CpuExceptionHandler: Add support for MONITOR/MONITORX " Lendacky, Thomas
2019-09-19 19:53 ` [RFC PATCH v2 32/44] UefiCpuPkg/CpuExceptionHandler: Add support for MWAIT/MWAITX " Lendacky, Thomas
2019-09-19 19:53 ` [RFC PATCH v2 33/44] UefiCpuPkg/CpuExceptionHandler: Add support for DR7 Read/Write " Lendacky, Thomas
2019-09-19 19:53 ` [RFC PATCH v2 34/44] UefiCpuPkg/MpInitLib: Update CPU MP data with a flag to indicate if SEV-ES is active Lendacky, Thomas
2019-09-19 19:53 ` [RFC PATCH v2 36/44] UefiCpuPkg: Add a 16-bit protected mode code segment descriptor Lendacky, Thomas
2019-09-19 19:53 ` [RFC PATCH v2 35/44] MdeModulePkg: Reserve " Lendacky, Thomas
2019-09-19 19:53 ` [RFC PATCH v2 37/44] OvmfPkg: Add support for SEV-ES AP reset vector re-directing Lendacky, Thomas
2019-10-02 14:54   ` [edk2-devel] " Laszlo Ersek
2019-10-02 17:33     ` Lendacky, Thomas
2019-10-03  9:09       ` Laszlo Ersek
2019-09-19 19:53 ` [RFC PATCH v2 38/44] UefiCpuPkg: Allow AP booting under SEV-ES Lendacky, Thomas
2019-10-02 15:15   ` [edk2-devel] " Laszlo Ersek
2019-10-02 15:26     ` Laszlo Ersek
2019-10-02 18:07       ` Lendacky, Thomas
2019-10-03 10:12         ` Laszlo Ersek
2019-10-03 10:32           ` Laszlo Ersek
2019-10-03 15:12             ` Lendacky, Thomas
2019-10-10 23:17               ` Lendacky, Thomas
2019-10-10 23:56                 ` Andrew Fish
2019-10-11  8:56                 ` Laszlo Ersek
2019-10-12  6:42                   ` Andrew Fish
2019-10-12  7:46                     ` Liming Gao
2019-10-12 18:50                       ` Andrew Fish
2019-10-14 13:11                     ` Laszlo Ersek
2019-10-14 19:11                       ` Andrew Fish
2019-10-02 17:58     ` Lendacky, Thomas
2019-10-03  9:21       ` Laszlo Ersek
2019-09-19 19:53 ` [RFC PATCH v2 40/44] MdePkg: Add a finalization function to the CPU protocol Lendacky, Thomas
2019-09-20 13:16 ` [RFC PATCH v2 39/44] OvmfPkg: Move the GHCB allocations into reserved memory Lendacky, Thomas
2019-10-02 14:38   ` [edk2-devel] " Laszlo Ersek
2019-09-20 13:16 ` [RFC PATCH v2 42/44] UefiCpuPkg/MpInitLib: Prepare SEV-ES guest APs for OS use Lendacky, Thomas
2019-12-12  8:24   ` Ni, Ray
2019-12-13 16:35     ` Lendacky, Thomas
2019-09-20 13:16 ` [RFC PATCH v2 41/44] UefiCpuPkg/MpInitLib: Add MP finalization interface to MpInitLib Lendacky, Thomas
2019-09-20 13:16 ` [RFC PATCH v2 43/44] UefiCpuPkg/CpuDxe: Provide an DXE MP finalization routine to support SEV-ES Lendacky, Thomas
2019-09-20 13:16 ` [RFC PATCH v2 44/44] MdeModulePkg/DxeCore: Perform the CPU protocol finalization support Lendacky, Thomas
2019-09-20 19:24 ` [RFC PATCH v2 00/44] SEV-ES guest support Lendacky, Thomas
2019-09-24  1:55   ` [edk2-devel] " Dong, Eric
2019-09-24 14:31     ` Lendacky, Thomas
2019-09-25 22:31       ` Ni, Ray

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