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Peter Anvin" Subject: Re: [RFC 04/16] KVM: selftests: set CPUID before setting sregs in vcpu creation Message-ID: <20211013150534.noxfgms66xkwvhxq@amd.com> References: <20211005234459.430873-1-michael.roth@amd.com> <20211006203617.13045-1-michael.roth@amd.com> <29aa85d5-fcc7-bf25-dd04-2476dc7b6241@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <29aa85d5-fcc7-bf25-dd04-2476dc7b6241@oracle.com> X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: bda0b052-45c5-4342-bf5c-08d98e5b3456 X-MS-TrafficTypeDiagnostic: BN9PR12MB5066: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:10000; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(4636009)(36840700001)(46966006)(508600001)(2616005)(54906003)(44832011)(26005)(4326008)(16526019)(2906002)(186003)(336012)(1076003)(8676002)(316002)(36756003)(70206006)(70586007)(356005)(82310400003)(53546011)(36860700001)(8936002)(7416002)(47076005)(4744005)(6666004)(86362001)(5660300002)(426003)(81166007)(6916009)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Oct 2021 15:07:41.9461 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bda0b052-45c5-4342-bf5c-08d98e5b3456 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: CO1NAM11FT040.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN9PR12MB5066 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 12, 2021 at 06:45:09PM -0700, Krish Sadhukhan wrote: > > On 10/6/21 1:36 PM, Michael Roth wrote: > > KVM_SET_CPUID*, but kselftests currently call KVM_SET_SREGS as part of > > vm_vcpu_add_default(),*prior* to vCPU creation, so there's no > > opportunity to call KVM_SET_CPUID* in advance. As a result, > In the current code, I see that KVM_SET_SREGS is called by vcpu_setup() > which is called after vm_vcpu_add() that calls KVM_CREATE_VCPU. Since you > mentioned "prior", I wanted to check if the wording was wrong or if I missed > something. Ah, yes, just poorly worded. What I meant to convey is that from the perspective the test program the vm_vcpu_add* call that creates the vcpu does the KVM_SET_SREGS, so there's no way to call KVM_SET_CPUID in advance other than to have vm_vcpu_add* do it as part of creating the vcpu. I get the wording fixed up on that.