From nobody Mon Feb 9 20:46:05 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of groups.io designates 66.175.222.108 as permitted sender) client-ip=66.175.222.108; envelope-from=bounce+27952+94358+1787277+3901457@groups.io; helo=mail02.groups.io; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce+27952+94358+1787277+3901457@groups.io ARC-Seal: i=1; a=rsa-sha256; t=1664220780; cv=none; d=zohomail.com; s=zohoarc; b=Pdih+KH13pR71ahl4I+Z3v/5F31IeSlcJ6Vgw5i2K2yCp/Wg0hWGBC4MiFOY1cqNCHZfURB7kqG8ErvPCQwxQPshxC8yRM6Px32IV90L4h1k4V9lUnO3ipjKtpRrM0EbVlwPgaG7Gtz3EWKigVZ93QG7fCmYPPPMosuFqWWQvlU= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1664220780; h=Content-Type:Cc:Date:From:In-Reply-To:List-Subscribe:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Reply-To:References:Sender:Subject:To; bh=FiwaavWRP1BOOqEdelv9o8fyJJwJYx+QXw14ewAqYHw=; b=PDJ8E2/UrRZ4mFd7ytgo8tjwsbAvsgtABzI/lWBVbVFaADn5F6ixIOQggVjGhDT0QOhEpDdBrkl9hodwwCEIO/dgoNxel8ZR0ikIiGrKr4MKOBQc12/tsLoZLb4r7E/880t9meeCbkbFJ38ISckTO+djS+CZWvmImKRLHUhFOmE= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce+27952+94358+1787277+3901457@groups.io Received: from mail02.groups.io (mail02.groups.io [66.175.222.108]) by mx.zohomail.com with SMTPS id 166422078061696.88252004310857; Mon, 26 Sep 2022 12:33:00 -0700 (PDT) Return-Path: X-Received: by 127.0.0.2 with SMTP id pDn1YY1788612xIWNpwjMV1j; Mon, 26 Sep 2022 12:33:00 -0700 X-Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) by mx.groups.io with SMTP id smtpd.web10.2312.1664220779375373076 for ; Mon, 26 Sep 2022 12:32:59 -0700 X-Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-349423f04dbso71448497b3.13 for ; Mon, 26 Sep 2022 12:32:59 -0700 (PDT) X-Gm-Message-State: qlrFGv2EG7AkDj5FjVTIUN1Fx1787277AA= X-Google-Smtp-Source: AMsMyM7DQrv1aKr7mj4HqDtUFWLONwkwngQCFqjL99rW8cbi6G9mEmOwB7ao6tvK2uRBzmloYIIvCW8EObIATl1S/A== X-Received: from dionnaglaze.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:2ee6]) (user=dionnaglaze job=sendgmr) by 2002:a81:4ec3:0:b0:351:2197:292b with SMTP id c186-20020a814ec3000000b003512197292bmr2266472ywb.273.1664220778533; Mon, 26 Sep 2022 12:32:58 -0700 (PDT) Date: Mon, 26 Sep 2022 19:32:39 +0000 In-Reply-To: <20220926193242.2094502-1-dionnaglaze@google.com> Mime-Version: 1.0 References: <20220926193242.2094502-1-dionnaglaze@google.com> Message-ID: <20220926193242.2094502-2-dionnaglaze@google.com> Subject: [edk2-devel] [PATCH v3 1/4] OvmfPkg: Realize EfiMemoryAcceptProtocol in AmdSevDxe From: "Dionna Glaze via groups.io" To: devel@edk2.groups.io Cc: Dionna Glaze , Gerd Hoffmann , James Bottomley , Jiewen Yao , Tom Lendacky , Sophia Wolf Precedence: Bulk List-Unsubscribe: List-Subscribe: List-Help: Sender: devel@edk2.groups.io List-Id: Mailing-List: list devel@edk2.groups.io; contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,dionnaglaze@google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1664220780; bh=gtcJKsdt97/FZ0ShH5EKe/dP9tfjmj92gEN1bU9mkLo=; h=Cc:Content-Type:Date:From:Reply-To:Subject:To; b=tiUP56Yto20xuGB0F+YNXhS5fhuAleFGEghlvjmEBEd70ROK9sBjknIFdBuRIR1Zw6M 2MC86eLJDqYbNdgGksK4CBMuWi79+3ExnR4DHKhQy8eBrPA8YiPWNZgvHHXhyKFXbAvPq MXDcvuBhcWHxJnB19Ipw3qx1V0sIWymummk= X-ZohoMail-DKIM: pass (identity @groups.io) X-ZM-MESSAGEID: 1664220781891100006 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Sophia Wolf When a guest OS does not support unaccepted memory, the unaccepted memory must be accepted before returning a memory map to the caller. EfiMemoryAcceptProtocol is defined in MdePkg and is implemented / Installed in AmdSevDxe for AMD SEV-SNP memory acceptance. Cc: Gerd Hoffmann Cc: James Bottomley Cc: Jiewen Yao Cc: Tom Lendacky Signed-off-by: Sophia Wolf --- OvmfPkg/AmdSevDxe/AmdSevDxe.c | 34 ++= ++++++++++++++++++ OvmfPkg/AmdSevDxe/AmdSevDxe.inf | 3 ++ OvmfPkg/Library/BaseMemEncryptSevLib/X64/DxeSnpSystemRamValidate.c | 24 ++= +++++++++--- 3 files changed, 57 insertions(+), 4 deletions(-) diff --git a/OvmfPkg/AmdSevDxe/AmdSevDxe.c b/OvmfPkg/AmdSevDxe/AmdSevDxe.c index 662d3c4ccb..09aa15165d 100644 --- a/OvmfPkg/AmdSevDxe/AmdSevDxe.c +++ b/OvmfPkg/AmdSevDxe/AmdSevDxe.c @@ -20,6 +20,7 @@ #include #include #include +#include =20 STATIC CONFIDENTIAL_COMPUTING_SNP_BLOB_LOCATION mSnpBootDxeTable =3D { SIGNATURE_32 ('A', 'M', 'D', 'E'), @@ -31,6 +32,29 @@ STATIC CONFIDENTIAL_COMPUTING_SNP_BLOB_LOCATION mSnpBoo= tDxeTable =3D { FixedPcdGet32 (PcdOvmfCpuidSize), }; =20 +STATIC EFI_HANDLE mAmdSevDxeHandle =3D NULL; + +STATIC +EFI_STATUS +EFIAPI +AmdSevMemoryAccept ( + IN EFI_MEMORY_ACCEPT_PROTOCOL *This, + IN EFI_PHYSICAL_ADDRESS StartAddress, + IN UINTN Size +) +{ + MemEncryptSevSnpPreValidateSystemRam ( + StartAddress, + EFI_SIZE_TO_PAGES (Size) + ); + + return EFI_SUCCESS; +} + +STATIC EFI_MEMORY_ACCEPT_PROTOCOL mMemoryAcceptProtocol =3D { + AmdSevMemoryAccept +}; + EFI_STATUS EFIAPI AmdSevDxeEntryPoint ( @@ -147,6 +171,16 @@ AmdSevDxeEntryPoint ( } } =20 + Status =3D gBS->InstallProtocolInterface ( + &mAmdSevDxeHandle, + &gEfiMemoryAcceptProtocolGuid, + EFI_NATIVE_INTERFACE, + &mMemoryAcceptProtocol + ); + if (EFI_ERROR (Status)) { + DEBUG ((DEBUG_ERROR, "Install EfiMemoryAcceptProtocol failed.\n")); + } + // // If its SEV-SNP active guest then install the CONFIDENTIAL_COMPUTING_S= EV_SNP_BLOB. // It contains the location for both the Secrets and CPUID page. diff --git a/OvmfPkg/AmdSevDxe/AmdSevDxe.inf b/OvmfPkg/AmdSevDxe/AmdSevDxe.= inf index 9acf860cf2..5ddddabc32 100644 --- a/OvmfPkg/AmdSevDxe/AmdSevDxe.inf +++ b/OvmfPkg/AmdSevDxe/AmdSevDxe.inf @@ -47,6 +47,9 @@ gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSnpSecretsBase gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSnpSecretsSize =20 +[Protocols] + gEfiMemoryAcceptProtocolGuid + [Guids] gConfidentialComputingSevSnpBlobGuid =20 diff --git a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/DxeSnpSystemRamValida= te.c b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/DxeSnpSystemRamValidate.c index d3a95e4913..ee3710f7b3 100644 --- a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/DxeSnpSystemRamValidate.c +++ b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/DxeSnpSystemRamValidate.c @@ -14,6 +14,7 @@ #include =20 #include "SnpPageStateChange.h" +#include "VirtualMemory.h" =20 /** Pre-validate the system RAM when SEV-SNP is enabled in the guest VM. @@ -29,12 +30,27 @@ MemEncryptSevSnpPreValidateSystemRam ( IN UINTN NumPages ) { + EFI_STATUS Status; + if (!MemEncryptSevSnpIsEnabled ()) { return; } =20 - // - // All the pre-validation must be completed in the PEI phase. - // - ASSERT (FALSE); + // DXE pre-validation may happen with the memory accept protocol. + // The protocol should only be called outside the prevalidated ranges + // that the PEI stage code explicitly skips. Specifically, only memory + // ranges that are classified as unaccepted. + if (BaseAddress >=3D SIZE_4GB) { + Status =3D InternalMemEncryptSevCreateIdentityMap1G ( + 0, + BaseAddress, + EFI_PAGES_TO_SIZE (NumPages) + ); + if (EFI_ERROR (Status)) { + ASSERT (FALSE); + CpuDeadLoop (); + } + } + + InternalSetPageState (BaseAddress, NumPages, SevSnpPagePrivate, TRUE); } --=20 2.37.3.998.g577e59143f-goog -=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 (#94358): https://edk2.groups.io/g/devel/message/94358 Mute This Topic: https://groups.io/mt/93934990/1787277 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-