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Fri, 14 Jul 2023 20:28:43 +0000 X-Received: from tlendack-t1.amdoffice.net (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 15.1.2507.23; Fri, 14 Jul 2023 15:28:41 -0500 From: "Lendacky, Thomas via groups.io" To: CC: Ard Biesheuvel , Jiewen Yao , Jordan Justen , "Gerd Hoffmann" , Erdem Aktas , "James Bottomley" , Min Xu , Michael Roth Subject: [edk2-devel] [PATCH] OvmfPkg/ResetVector: Fix assembler bit test flag check Date: Fri, 14 Jul 2023 15:28:26 -0500 Message-ID: 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-TrafficTypeDiagnostic: CO1NAM11FT013:EE_|DM3PR12MB9416:EE_ X-MS-Office365-Filtering-Correlation-Id: 7b3a1363-846f-48fb-0250-08db84a8ead6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Message-Info: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jul 2023 20:28:43.0916 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7b3a1363-846f-48fb-0250-08db84a8ead6 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT013.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM3PR12MB9416 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,thomas.lendacky@amd.com X-Gm-Message-State: nVNvZ1UpgTtkE58mjM041eMpx1787277AA= Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @groups.io) X-ZM-MESSAGEID: 1689366528161100001 Content-Type: text/plain; charset="utf-8" Commit 63c50d3ff2854a76432b752af4f2a76f33ff1974 changed the check that is used to determine if SEV-ES is active. Originally, a CMP instruction with a supporting JZ instruction was used for the check. It was changed to use the BT instruction but not JZ instruction. The result of a BT instruction changes the the carry flag (CF) and not the zero flag (ZF). As a result, the wrong condition is being checked. Update the JZ to a JNC to properly detect if SEV-ES is active. Fixes: 63c50d3ff285 ("OvmfPkg/ResetVector: cache the SEV status MSR...") Signed-off-by: Tom Lendacky --- OvmfPkg/ResetVector/Ia32/Flat32ToFlat64.asm | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/OvmfPkg/ResetVector/Ia32/Flat32ToFlat64.asm b/OvmfPkg/ResetVec= tor/Ia32/Flat32ToFlat64.asm index c5c683ebed3e..429a58c5efd3 100644 --- a/OvmfPkg/ResetVector/Ia32/Flat32ToFlat64.asm +++ b/OvmfPkg/ResetVector/Ia32/Flat32ToFlat64.asm @@ -44,7 +44,7 @@ Transition32FlatTo64Flat: =20 mov ecx, 1 bt [SEV_ES_WORK_AREA_STATUS_MSR], ecx - jz EnablePaging + jnc EnablePaging =20 ; ; SEV-ES is active, perform a quick sanity check against the reported --=20 2.40.1 -=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 (#106946): https://edk2.groups.io/g/devel/message/106946 Mute This Topic: https://groups.io/mt/100149226/1787277 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-