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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,thomas.lendacky@amd.com X-Gm-Message-State: Zrwi2LqlxWYBW0SPmcMh6X5Yx1787277AA= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1589925098; bh=sk05aiykP6kGfSwoMiIZlkLZ1p/hhuVBs86Px9nkYgc=; h=Cc:Content-Type:Date:From:Reply-To:Subject:To; b=fy+XJXjLProxt2lGxjvht2aAy9MqnVvt2UH1ZYImV2K49Aa0IUv+VgMjsw9JDsf2FTY d6KLEwn2TabfteWF435XwvwsuKRGsgENLCRk/cgdUBoSIFDP4Z7cMJnE6FYVweuKUBmbe tnllhHXCx3SoN9IloNifkzXDetws7eaPsO8= X-ZohoMail-DKIM: pass (identity @groups.io) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3D2198 VMGEXIT is a new instruction used for Hypervisor/Guest communication when running as an SEV-ES guest. A VMGEXIT will cause an automatic exit (AE) to occur, resulting in a #VMEXIT with an exit code value of 0x403. Provide the necessary support to execute the VMGEXIT instruction, which is "rep; vmmcall". Cc: Michael D Kinney Cc: Liming Gao Signed-off-by: Tom Lendacky --- MdePkg/Library/BaseLib/BaseLib.inf | 2 ++ MdePkg/Include/Library/BaseLib.h | 14 +++++++++ MdePkg/Library/BaseLib/Ia32/GccInline.c | 17 +++++++++++ MdePkg/Library/BaseLib/X64/GccInline.c | 17 +++++++++++ MdePkg/Library/BaseLib/Ia32/VmgExit.nasm | 37 ++++++++++++++++++++++++ MdePkg/Library/BaseLib/X64/VmgExit.nasm | 32 ++++++++++++++++++++ 6 files changed, 119 insertions(+) create mode 100644 MdePkg/Library/BaseLib/Ia32/VmgExit.nasm create mode 100644 MdePkg/Library/BaseLib/X64/VmgExit.nasm diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/Ba= seLib.inf index da6bc22a3e2b..7cf6467fa77b 100644 --- a/MdePkg/Library/BaseLib/BaseLib.inf +++ b/MdePkg/Library/BaseLib/BaseLib.inf @@ -154,6 +154,7 @@ [Sources.Ia32] Ia32/EnableCache.c | MSFT Ia32/DisableCache.c | MSFT Ia32/XGetBv.nasm | MSFT + Ia32/VmgExit.nasm | MSFT =20 =20 Ia32/GccInline.c | GCC @@ -289,6 +290,7 @@ [Sources.X64] X64/ReadCr0.nasm| MSFT X64/ReadEflags.nasm| MSFT X64/XGetBv.nasm | MSFT + X64/VmgExit.nasm | MSFT =20 =20 X64/Non-existing.c diff --git a/MdePkg/Include/Library/BaseLib.h b/MdePkg/Include/Library/Base= Lib.h index 049fd1b872b8..2d131b2ac8a1 100644 --- a/MdePkg/Include/Library/BaseLib.h +++ b/MdePkg/Include/Library/BaseLib.h @@ -7959,6 +7959,20 @@ AsmXGetBv ( ); =20 =20 +/** + Executes a VMGEXIT instruction (VMMCALL with a REP prefix) + + Executes a VMGEXIT instruction. This function is only available on IA-32= and + x64. + +**/ +VOID +EFIAPI +AsmVmgExit ( + VOID + ); + + /** Patch the immediate operand of an IA32 or X64 instruction such that the = byte, word, dword or qword operand is encoded at the end of the instruction's diff --git a/MdePkg/Library/BaseLib/Ia32/GccInline.c b/MdePkg/Library/BaseL= ib/Ia32/GccInline.c index 591f0bb0e097..ee8c62c79c93 100644 --- a/MdePkg/Library/BaseLib/Ia32/GccInline.c +++ b/MdePkg/Library/BaseLib/Ia32/GccInline.c @@ -1791,3 +1791,20 @@ AsmXGetBv ( } =20 =20 +/** + Executes a VMGEXIT instruction. + + Executes a VMGEXIT instruction. This function is only available on IA-32= and + X64. + +**/ +VOID +EFIAPI +AsmVmgExit ( + VOID + ) +{ + __asm__ __volatile__ ("rep; vmmcall":::"memory"); +} + + diff --git a/MdePkg/Library/BaseLib/X64/GccInline.c b/MdePkg/Library/BaseLi= b/X64/GccInline.c index 3eed1205adb2..277974eff9ee 100644 --- a/MdePkg/Library/BaseLib/X64/GccInline.c +++ b/MdePkg/Library/BaseLib/X64/GccInline.c @@ -1828,3 +1828,20 @@ AsmXGetBv ( } =20 =20 +/** + Executes a VMGEXIT instruction. + + Executes a VMGEXIT instruction. This function is only available on IA-32= and + X64. + +**/ +VOID +EFIAPI +AsmVmgExit ( + VOID + ) +{ + __asm__ __volatile__ ("rep; vmmcall":::"memory"); +} + + diff --git a/MdePkg/Library/BaseLib/Ia32/VmgExit.nasm b/MdePkg/Library/Base= Lib/Ia32/VmgExit.nasm new file mode 100644 index 000000000000..a4b37385cc7a --- /dev/null +++ b/MdePkg/Library/BaseLib/Ia32/VmgExit.nasm @@ -0,0 +1,37 @@ +;-------------------------------------------------------------------------= ----- +; +; Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.
+; SPDX-License-Identifier: BSD-2-Clause-Patent +; +; Module Name: +; +; VmgExit.Asm +; +; Abstract: +; +; AsmVmgExit function +; +; Notes: +; +;-------------------------------------------------------------------------= ----- + + SECTION .text + +;-------------------------------------------------------------------------= ----- +; VOID +; EFIAPI +; AsmVmgExit ( +; VOID +; ); +;-------------------------------------------------------------------------= ----- +global ASM_PFX(AsmVmgExit) +ASM_PFX(AsmVmgExit): +; +; NASM doesn't support the vmmcall instruction in 32-bit mode, so work aro= und +; this by temporarily switching to 64-bit mode. +; +BITS 64 + rep vmmcall +BITS 32 + ret + diff --git a/MdePkg/Library/BaseLib/X64/VmgExit.nasm b/MdePkg/Library/BaseL= ib/X64/VmgExit.nasm new file mode 100644 index 000000000000..26f034593c67 --- /dev/null +++ b/MdePkg/Library/BaseLib/X64/VmgExit.nasm @@ -0,0 +1,32 @@ +;-------------------------------------------------------------------------= ----- +; +; Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.
+; SPDX-License-Identifier: BSD-2-Clause-Patent +; +; Module Name: +; +; VmgExit.Asm +; +; Abstract: +; +; AsmVmgExit function +; +; Notes: +; +;-------------------------------------------------------------------------= ----- + + DEFAULT REL + SECTION .text + +;-------------------------------------------------------------------------= ----- +; VOID +; EFIAPI +; AsmVmgExit ( +; VOID +; ); +;-------------------------------------------------------------------------= ----- +global ASM_PFX(AsmVmgExit) +ASM_PFX(AsmVmgExit): + rep vmmcall + ret + --=20 2.17.1 -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#59863): https://edk2.groups.io/g/devel/message/59863 Mute This Topic: https://groups.io/mt/74336559/1787277 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org] -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-