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Wed, 10 Nov 2021 22:15:30 +0000 X-Received: from sbrijesh-desktop.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.17; Wed, 10 Nov 2021 16:15:29 -0600 From: "Brijesh Singh via groups.io" To: CC: James Bottomley , Min Xu , "Jiewen Yao" , Tom Lendacky , "Jordan Justen" , Ard Biesheuvel , Erdem Aktas , "Michael Roth" , Gerd Hoffmann , "Michael D Kinney" , Liming Gao , Zhiguang Liu , Ray Ni , Rahul Kumar , Eric Dong , Brijesh Singh , Michael Roth Subject: [edk2-devel] [PATCH v12 26/32] UefiCpuPkg/MpLib: add support to register GHCB GPA when SEV-SNP is enabled Date: Wed, 10 Nov 2021 16:14:51 -0600 Message-ID: <20211110221457.2397234-27-brijesh.singh@amd.com> In-Reply-To: <20211110221457.2397234-1-brijesh.singh@amd.com> References: <20211110221457.2397234-1-brijesh.singh@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 2eb28da0-f996-4a8a-322c-08d9a4979bbd X-MS-TrafficTypeDiagnostic: SA0PR12MB4511: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:10000; 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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,brijesh.singh@amd.com X-Gm-Message-State: tSNCw6jfHYxuBcfRiGBIUThmx1787277AA= Content-Transfer-Encoding: quoted-printable DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1636582535; bh=tsiWx699Z0jAa3MiBY8s/BkYEMCFmXH1YGapMRw2lVg=; h=CC:Content-Type:Date:From:Reply-To:Subject:To; b=mzVojxjhbszr6wY+uu10Hea71DFBEBM6SMHeJfDJu5IlU7IP643O/HTOEeOb/dy6K/i bNnev/Ymxlr90qC699TQcp/uiSa23pAMU7ANYus5GytzYfjAu0oF6/EGXJOUogzQ2U7Ih 9gveaEz/TNU881xXcWEYZkxMSrhYNlarrC8= X-ZohoMail-DKIM: pass (identity @groups.io) X-ZM-MESSAGEID: 1636582536222100034 Content-Type: text/plain; charset="utf-8" BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3D3275 An SEV-SNP guest requires that the physical address of the GHCB must be registered with the hypervisor before using it. See the GHCB specification section 2.3.2 for more details. Cc: Michael Roth Cc: Eric Dong Cc: Ray Ni Cc: Rahul Kumar Cc: James Bottomley Cc: Min Xu Cc: Jiewen Yao Cc: Tom Lendacky Cc: Jordan Justen Cc: Ard Biesheuvel Cc: Erdem Aktas Cc: Gerd Hoffmann Acked-by: Gerd Hoffmann Signed-off-by: Brijesh Singh --- UefiCpuPkg/Library/MpInitLib/MpLib.h | 2 + UefiCpuPkg/Library/MpInitLib/MpLib.c | 2 + UefiCpuPkg/Library/MpInitLib/MpEqu.inc | 1 + UefiCpuPkg/Library/MpInitLib/X64/AmdSev.nasm | 54 ++++++++++++++++++++ 4 files changed, 59 insertions(+) diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.h b/UefiCpuPkg/Library/MpIn= itLib/MpLib.h index 2107f3f705a2..45bc1de23e3c 100644 --- a/UefiCpuPkg/Library/MpInitLib/MpLib.h +++ b/UefiCpuPkg/Library/MpInitLib/MpLib.h @@ -222,6 +222,7 @@ typedef struct { // BOOLEAN Enable5LevelPaging; BOOLEAN SevEsIsEnabled; + BOOLEAN SevSnpIsEnabled; UINTN GhcbBase; } MP_CPU_EXCHANGE_INFO; =20 @@ -291,6 +292,7 @@ struct _CPU_MP_DATA { BOOLEAN WakeUpByInitSipiSipi; =20 BOOLEAN SevEsIsEnabled; + BOOLEAN SevSnpIsEnabled; UINTN SevEsAPBuffer; UINTN SevEsAPResetStackStart; CPU_MP_DATA *NewCpuMpData; diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c b/UefiCpuPkg/Library/MpIn= itLib/MpLib.c index 9109607c87a9..ab838cbc0ff6 100644 --- a/UefiCpuPkg/Library/MpInitLib/MpLib.c +++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c @@ -889,6 +889,7 @@ FillExchangeInfoData ( DEBUG ((DEBUG_INFO, "%a: 5-Level Paging =3D %d\n", gEfiCallerBaseName, E= xchangeInfo->Enable5LevelPaging)); =20 ExchangeInfo->SevEsIsEnabled =3D CpuMpData->SevEsIsEnabled; + ExchangeInfo->SevSnpIsEnabled =3D CpuMpData->SevSnpIsEnabled; ExchangeInfo->GhcbBase =3D (UINTN) CpuMpData->GhcbBase; =20 // @@ -1817,6 +1818,7 @@ MpInitLibInitialize ( CpuMpData->CpuInfoInHob =3D (UINT64) (UINTN) (CpuMpData->CpuData + M= axLogicalProcessorNumber); InitializeSpinLock(&CpuMpData->MpLock); CpuMpData->SevEsIsEnabled =3D ConfidentialComputingGuestHas (CCAttrAmdSe= vEs); + CpuMpData->SevSnpIsEnabled =3D ConfidentialComputingGuestHas (CCAttrAmdS= evSnp); CpuMpData->SevEsAPBuffer =3D (UINTN) -1; CpuMpData->GhcbBase =3D PcdGet64 (PcdGhcbBase); =20 diff --git a/UefiCpuPkg/Library/MpInitLib/MpEqu.inc b/UefiCpuPkg/Library/Mp= InitLib/MpEqu.inc index 2e9368a374a4..01668638f245 100644 --- a/UefiCpuPkg/Library/MpInitLib/MpEqu.inc +++ b/UefiCpuPkg/Library/MpInitLib/MpEqu.inc @@ -92,6 +92,7 @@ struc MP_CPU_EXCHANGE_INFO .ModeHighSegment: CTYPE_UINT16 1 .Enable5LevelPaging: CTYPE_BOOLEAN 1 .SevEsIsEnabled: CTYPE_BOOLEAN 1 + .SevSnpIsEnabled CTYPE_BOOLEAN 1 .GhcbBase: CTYPE_UINTN 1 endstruc =20 diff --git a/UefiCpuPkg/Library/MpInitLib/X64/AmdSev.nasm b/UefiCpuPkg/Libr= ary/MpInitLib/X64/AmdSev.nasm index 0ccafe25eca4..0034920b2f6b 100644 --- a/UefiCpuPkg/Library/MpInitLib/X64/AmdSev.nasm +++ b/UefiCpuPkg/Library/MpInitLib/X64/AmdSev.nasm @@ -15,6 +15,57 @@ =20 %define SIZE_4KB 0x1000 =20 +RegisterGhcbGpa: + ; + ; Register GHCB GPA when SEV-SNP is enabled + ; + lea edi, [esi + MP_CPU_EXCHANGE_INFO_FIELD (SevSnpIsEnabled)] + cmp byte [edi], 1 ; SevSnpIsEnabled + jne RegisterGhcbGpaDone + + ; Save the rdi and rsi to used for later comparison + push rdi + push rsi + mov edi, eax + mov esi, edx + or eax, 18 ; Ghcb registration request + wrmsr + rep vmmcall + rdmsr + mov r12, rax + and r12, 0fffh + cmp r12, 19 ; Ghcb registration response + jne GhcbGpaRegisterFailure + + ; Verify that GPA is not changed + and eax, 0fffff000h + cmp edi, eax + jne GhcbGpaRegisterFailure + cmp esi, edx + jne GhcbGpaRegisterFailure + pop rsi + pop rdi + jmp RegisterGhcbGpaDone + + ; + ; Request the guest termination + ; +GhcbGpaRegisterFailure: + xor edx, edx + mov eax, 256 ; GHCB terminate + wrmsr + rep vmmcall + + ; We should not return from the above terminate request, but if we do + ; then enter into the hlt loop. +DoHltLoop: + cli + hlt + jmp DoHltLoop + +RegisterGhcbGpaDone: + OneTimeCallRet RegisterGhcbGpa + ; ; The function checks whether SEV-ES is enabled, if enabled ; then setup the GHCB page. @@ -39,6 +90,9 @@ SevEsSetupGhcb: mov rdx, rax shr rdx, 32 mov rcx, 0xc0010130 + + OneTimeCall RegisterGhcbGpa + wrmsr =20 SevEsSetupGhcbExit: --=20 2.25.1 -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- Groups.io Links: You receive all messages sent to this group. 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