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Wed, 13 Oct 2021 16:57:57 +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 15.1.2308.8; Wed, 13 Oct 2021 11:57:54 -0500 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 , Brijesh Singh , Michael Roth , Ray Ni , Rahul Kumar , Eric Dong Subject: [edk2-devel] [PATCH v9 23/32] UefiCpuPkg: add PcdGhcbHypervisorFeatures Date: Wed, 13 Oct 2021 11:57:04 -0500 Message-ID: <20211013165713.727815-24-brijesh.singh@amd.com> In-Reply-To: <20211013165713.727815-1-brijesh.singh@amd.com> References: <20211013165713.727815-1-brijesh.singh@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: ae9e16b2-8ae2-4a79-8896-08d98e6a9b7d X-MS-TrafficTypeDiagnostic: BYAPR12MB2663: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; 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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,brijesh.singh@amd.com X-Gm-Message-State: WlvbpkJAq41Y0btIU1OMwXjHx1787277AA= Content-Transfer-Encoding: quoted-printable DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1634144285; bh=KpF1D4FkBGafHScZU4Z8mluL4C/GwrE7dd15uQESvPQ=; h=CC:Content-Type:Date:From:Reply-To:Subject:To; b=F0Cc7CqPL4lwnTFENvPbBdZISPjdfiH9nSjzO4w61xoWaV2F9xE7WQpQOnMXSYXUXw6 FicLP2tKWwKlyx2JZIeVsK+/F5p/Ks/lAHqbhnz4squUE5eZgxivNDbJXhSsPIOQDadri AZwuiGzmCGyDZCxnEoe+MWpYMRkXQfrgEUs= X-ZohoMail-DKIM: pass (identity @groups.io) X-ZM-MESSAGEID: 1634144287641100051 Content-Type: text/plain; charset="utf-8" BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3D3275 Version 2 of the GHCB specification added a new VMGEXIT that the guest could use for querying the hypervisor features. One of the immediate users for it will be an AP creation code. When SEV-SNP is enabled, the guest can use the newly added AP_CREATE VMGEXIT to create the APs. The MpInitLib will check the hypervisor feature, and if AP_CREATE is available, it will use it. See GHCB spec version 2 for more details on the VMGEXIT. Cc: Michael Roth Cc: Ray Ni Cc: Rahul Kumar Cc: Eric Dong Cc: James Bottomley Cc: Min Xu Cc: Jiewen Yao Cc: Tom Lendacky Cc: Jordan Justen Cc: Ard Biesheuvel Cc: Erdem Aktas Cc: Gerd Hoffmann Signed-off-by: Brijesh Singh Acked-by: Gerd Hoffmann --- UefiCpuPkg/UefiCpuPkg.dec | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec index 9dbaa407c399..c979a0a90a0e 100644 --- a/UefiCpuPkg/UefiCpuPkg.dec +++ b/UefiCpuPkg/UefiCpuPkg.dec @@ -400,5 +400,10 @@ [PcdsDynamic, PcdsDynamicEx] # @Prompt Memory encryption attribute gUefiCpuPkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0|UINT64|0x6= 0000017 =20 + ## This dynamic PCD contains the hypervisor features value obtained thro= ugh the GHCB HYPERVISOR + # features VMGEXIT defined in the version 2 of GHCB spec. + # @Prompt GHCB Hypervisor Features + gUefiCpuPkgTokenSpaceGuid.PcdGhcbHypervisorFeatures|0x0|UINT64|0x60000018 + [UserExtensions.TianoCore."ExtraFiles"] UefiCpuPkgExtra.uni --=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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