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Tue, 4 Feb 2020 23:03:05 +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] [PATCH v4 33/40] OvmfPkg/Sec: Enable cache early to speed up booting Date: Tue, 4 Feb 2020 17:01:37 -0600 Message-Id: <7b601b8cf0abc1b71d7a0ccb172e71a39b8b15fa.1580857303.git.thomas.lendacky@amd.com> In-Reply-To: References: X-ClientProxiedBy: SN6PR16CA0062.namprd16.prod.outlook.com (2603:10b6:805:ca::39) To DM6PR12MB3163.namprd12.prod.outlook.com (2603:10b6:5:15e::26) MIME-Version: 1.0 X-Received: from tlendack-t1.amd.com (165.204.77.1) by SN6PR16CA0062.namprd16.prod.outlook.com (2603:10b6:805:ca::39) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2686.32 via Frontend Transport; Tue, 4 Feb 2020 23:02:36 +0000 X-Originating-IP: [165.204.77.1] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 650c0bd6-76c9-4826-6be3-08d7a9c65411 X-MS-TrafficTypeDiagnostic: DM6PR12MB3930:|DM6PR12MB3930: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:9508; 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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,thomas.lendacky@amd.com X-Gm-Message-State: 6htEjzttP28jeNhh9XpMvSUox1787277AA= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1580857388; bh=sBzlCvVtl9atqWY1JVqbYtS64yHqq2m6byFMam0Wjrw=; h=Cc:Content-Type:Date:From:Reply-To:Subject:To; b=boyB1IBV4ldzuJq67reC1p0QT+2A81u/Ts5bCDTYHs/eS06G50Je+dyMjpQ4L4XTHSg Qb8aXPxJCa4TRzbxbS/NnnjJgi2YYZnjUvCW0fytT99jdW9zcGDwDgPaRBhbDTbISq+z1 8UFdfP+0wjXf3QIeP12+cOF7MyQuZc/tvKM= 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 Currently, the OVMF code relies on the hypervisor to enable the cache support on the processor in order to improve the boot speed. However, with SEV-ES, the hypervisor is not allowed to change the CR0 register to enable caching. Update the OVMF Sec support to enable caching in order to improve the boot speed 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/Sec/SecMain.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/OvmfPkg/Sec/SecMain.c b/OvmfPkg/Sec/SecMain.c index 2bab7128ade2..439c8a09be17 100644 --- a/OvmfPkg/Sec/SecMain.c +++ b/OvmfPkg/Sec/SecMain.c @@ -800,6 +800,13 @@ SecCoreStartupWithStack ( // For non SEV-ES guests, just load the IDTR. // AsmWriteIdtr (&IdtDescriptor); + } else { + // + // Under SEV-ES, the hypervisor can't modify CR0 and so can't enable + // caching in order to speed up the boot. Enable caching early for + // an SEV-ES guest. + // + AsmEnableCache (); } =20 DEBUG ((EFI_D_INFO, --=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 (#53780): https://edk2.groups.io/g/devel/message/53780 Mute This Topic: https://groups.io/mt/70985003/1787277 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-