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Wed, 20 Nov 2019 20:07:46 +0000 From: "Lendacky, Thomas" To: devel@edk2.groups.io Cc: Jordan Justen , Laszlo Ersek , Ard Biesheuvel , Michael D Kinney , Liming Gao , Eric Dong , Ray Ni , Brijesh Singh Subject: [edk2-devel] [RFC PATCH v3 29/43] OvmfPkg/PlatformPei: Move early GDT into ram when SEV-ES is enabled Date: Wed, 20 Nov 2019 14:06:51 -0600 Message-Id: <4a8c1f5360f7327b26cb141f60c42cbe858eb398.1574280425.git.thomas.lendacky@amd.com> In-Reply-To: References: X-ClientProxiedBy: DM3PR12CA0087.namprd12.prod.outlook.com (2603:10b6:0:57::31) To DM6PR12MB3163.namprd12.prod.outlook.com (2603:10b6:5:15e::26) MIME-Version: 1.0 X-Originating-IP: [165.204.77.1] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: fbe94b5e-f272-4aae-18ad-08d76df54f14 X-MS-TrafficTypeDiagnostic: DM6PR12MB3675: X-MS-Exchange-PUrlCount: 1 X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8273; Received-SPF: pass (zoho.com: domain of groups.io designates 66.175.222.12 as permitted sender) client-ip=66.175.222.12; 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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,thomas.lendacky@amd.com X-Gm-Message-State: eQ57BBEdVjSlFhpEhZJP5kDfx1787277AA= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1574280467; bh=zMro70RXpb7tr318rB8pNeAJXmp0K3rA4iqgV5FSOuY=; h=Cc:Content-Type:Date:From:Reply-To:Subject:To; b=H52n1zj1X9wR819eLr/jzuenwhF2CgR2XG8Wge7J4gJkzCIHf4xvGtUFQBLAhhIk+9d YqJz88sKBztkqdi0QV575slauuHD0UUbalSnY53RaJ6As8tMVwnS5KbDg+a8D67slunm4 mmFwLUd4PCkgjsoewaxTY1RsOSAxrHKJMeE= 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 The SEV support will clear the C-bit from non-RAM areas. The early GDT lives in a non-RAM area, so when an exception occurs (like a #VC) the GDT will be read as un-encrypted even though it is encrypted. This will result in a failure to be able to handle the exception. Move the GDT into RAM so it can be accessed without error when running as an SEV-ES guest. Cc: Jordan Justen Cc: Laszlo Ersek Cc: Ard Biesheuvel Reviewed-by: Laszlo Ersek Signed-off-by: Tom Lendacky --- OvmfPkg/PlatformPei/AmdSev.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c index 900b0d977d61..b3fd2d86541a 100644 --- a/OvmfPkg/PlatformPei/AmdSev.c +++ b/OvmfPkg/PlatformPei/AmdSev.c @@ -37,6 +37,8 @@ AmdSevEsInitialize ( PHYSICAL_ADDRESS GhcbBasePa; UINTN GhcbPageCount; RETURN_STATUS PcdStatus, DecryptStatus; + IA32_DESCRIPTOR Gdtr; + VOID *Gdt; =20 if (!MemEncryptSevEsIsEnabled ()) { return; @@ -74,6 +76,22 @@ AmdSevEsInitialize ( (UINT64)GhcbPageCount, GhcbBase)); =20 AsmWriteMsr64 (MSR_SEV_ES_GHCB, GhcbBasePa); + + // + // The SEV support will clear the C-bit from non-RAM areas. The early G= DT + // lives in a non-RAM area, so when an exception occurs (like a #VC) the= GDT + // will be read as un-encrypted even though it was created before the C-= bit + // was cleared (encrypted). This will result in a failure to be able to + // handle the exception. + // + AsmReadGdtr (&Gdtr); + + Gdt =3D AllocatePages (EFI_SIZE_TO_PAGES ((UINTN) Gdtr.Limit + 1)); + ASSERT (Gdt !=3D NULL); + + CopyMem (Gdt, (VOID *) Gdtr.Base, Gdtr.Limit + 1); + Gdtr.Base =3D (UINTN) Gdt; + AsmWriteGdtr (&Gdtr); } =20 /** --=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 (#50969): https://edk2.groups.io/g/devel/message/50969 Mute This Topic: https://groups.io/mt/60973128/1787277 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-