From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by mx.groups.io with SMTP id smtpd.web08.44234.1635772732134527695 for ; Mon, 01 Nov 2021 06:18:52 -0700 Authentication-Results: mx.groups.io; dkim=missing; spf=pass (domain: intel.com, ip: 192.55.52.120, mailfrom: min.m.xu@intel.com) X-IronPort-AV: E=McAfee;i="6200,9189,10154"; a="229737748" X-IronPort-AV: E=Sophos;i="5.87,199,1631602800"; d="scan'208";a="229737748" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Nov 2021 06:18:31 -0700 X-IronPort-AV: E=Sophos;i="5.87,199,1631602800"; d="scan'208";a="500035806" Received: from mxu9-mobl1.ccr.corp.intel.com ([10.255.29.216]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Nov 2021 06:18:27 -0700 From: "Min Xu" To: devel@edk2.groups.io Cc: Min Xu , Jian J Wang , Hao A Wu , Brijesh Singh , Erdem Aktas , James Bottomley , Jiewen Yao , Tom Lendacky , Gerd Hoffmann Subject: [PATCH V3 21/29] MdeModulePkg: EFER should not be changed in TDX Date: Mon, 1 Nov 2021 21:16:10 +0800 Message-Id: <4bb35e7313cd66673ee45dcbfbf248d758ec1550.1635769996.git.min.m.xu@intel.com> X-Mailer: git-send-email 2.29.2.windows.2 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429 In TDX IA32_ERER is RO to host VMM. It could not be changed. PcdIa32EferChangeAllowed is added in MdeModulePkg.dec and it is to be set to FALSE in Tdx guest. Cc: Jian J Wang Cc: Hao A Wu Cc: Brijesh Singh Cc: Erdem Aktas Cc: James Bottomley Cc: Jiewen Yao Cc: Tom Lendacky Cc: Gerd Hoffmann Signed-off-by: Min Xu --- MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf | 1 + MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c | 6 ++++++ MdeModulePkg/MdeModulePkg.dec | 5 +++++ 3 files changed, 12 insertions(+) diff --git a/MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf b/MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf index 19b8a4c8aefa..106b679b6bd0 100644 --- a/MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf +++ b/MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf @@ -117,6 +117,7 @@ gEfiMdeModulePkgTokenSpaceGuid.PcdUse5LevelPageTable ## SOMETIMES_CONSUMES gEfiMdeModulePkgTokenSpaceGuid.PcdGhcbBase ## CONSUMES gEfiMdeModulePkgTokenSpaceGuid.PcdGhcbSize ## CONSUMES + gEfiMdeModulePkgTokenSpaceGuid.PcdIa32EferChangeAllowed ## CONSUMES [Pcd.IA32,Pcd.X64,Pcd.ARM,Pcd.AARCH64] gEfiMdeModulePkgTokenSpaceGuid.PcdSetNxForStack ## SOMETIMES_CONSUMES diff --git a/MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c b/MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c index 6831946c54d3..8a3b72509310 100644 --- a/MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c +++ b/MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c @@ -148,6 +148,12 @@ IsEnableNonExecNeeded ( return FALSE; } + // + // Intel TDX sets this flag to FALSE. + // + if (!PcdGetBool (PcdIa32EferChangeAllowed)) { + return FALSE; + } // // XD flag (BIT63) in page table entry is only valid if IA32_EFER.NXE is set. // Features controlled by Following PCDs need this feature to be enabled. diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec index 133e04ee86ca..007044a311c2 100644 --- a/MdeModulePkg/MdeModulePkg.dec +++ b/MdeModulePkg/MdeModulePkg.dec @@ -2138,6 +2138,11 @@ # @Prompt GHCB Pool Size gEfiMdeModulePkgTokenSpaceGuid.PcdGhcbSize|0|UINT64|0x00030008 + ## This dynamic PCD indicates if IA32_EFER can be changed. The default value is TRUE but in + # Intel TDX change of IA32_EFER is not allowed. + # @Prompt The flag which indicates if IA32_EFER is allowed to be changed. + gEfiMdeModulePkgTokenSpaceGuid.PcdIa32EferChangeAllowed|TRUE|BOOLEAN|0x00030009 + [PcdsDynamicEx] ## This dynamic PCD enables the default variable setting. # Its value is the default store ID value. The default value is zero as Standard default. -- 2.29.2.windows.2