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helo=lists.xenproject.org; Received-SPF: SoftFail (protection.outlook.com: domain of transitioning amd.com discourages use of 149.199.90.133 as permitted sender) From: Jiaqing Zhao To: CC: Teddy Astie , Andrew Cooper , Jan Beulich , Jiaqing Zhao , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Subject: [PATCH] x86/cpuid: gate the hypervisor PV-only leaf on is_pv_domain() Date: Wed, 26 Aug 2026 15:25:26 +0800 Message-ID: <20260826072526.767424-1-Zhao.Jiaqing@amd.com> X-Mailer: git-send-email 2.53.0 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: satlexmb07.amd.com (10.181.42.216) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE35:EE_|SJ0PR12MB6880:EE_ X-MS-Office365-Filtering-Correlation-Id: 6f762f29-ea15-4440-ef90-08df03434152 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|23010399003|376014|82310400026|1800799024|10067099003|11063799006|18002099003|56012099006|3023799007; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: lYR5LWIrJVI3jBFCfBJn7Si3OFsrKXwpz1tpIfTlKm+TgkwAN8YgUzlYXTK0FLLn3rUHXCn8oR18g9teVfUZbZTPkfySlwAYoJOeyfFh1Yw+PerM+nAFQRam9AR6TxQ+JVHy2bk1WFAeC3d7otVUUMZ0MYgBvWMArhLKijbkntVrC+X1GgN8EHparR/933PEtciP+GlkhGf57/utAFZCFtBn/kmAfnuV6nplOABSryHVN1n9mG+TJdKaFqKw7tbgyLHyxBXz7JyQll4KoFh2CQxVdCmmv/PZDd+gYjQF8ySvZjlG4+99z3+6GZ50cmpad3Aw1toJ8QMxWX7FJe2rIr4ZGK0ALkgCfvzzcEaisBO/Ti1WNODbiOVf8shmR+7/gc91IHg5J28GBw162PVEgxCQm74gFobF48OT7GcCLaVmo3VQGmy7jzbtzwbnPZjd X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Aug 2026 07:25:50.2658 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6f762f29-ea15-4440-ef90-08df03434152 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[149.199.90.133];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EE35.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB6880 X-purgate-ID: tlsNG-720697/1787729166-674BE2AC-05BD3BC5/0/0 X-purgate-type: clean X-purgate-size: 929 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1787729207545158500 Hypervisor leaf 5 is PV-specific, but is gated with !is_hvm_domain(), which stays a runtime test in a build without PV support. Test for a PV domain directly so the compiler can discard the leaf when CONFIG_PV is disabled. Suggested-by: Roger Pau Monn=C3=A9 Signed-off-by: Jiaqing Zhao Acked-by: Roger Pau Monn=C3=A9 Reviewed-by: Jan Beulich --- xen/arch/x86/cpuid.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/arch/x86/cpuid.c b/xen/arch/x86/cpuid.c index 6e9b15c9c3..a9aeb2d268 100644 --- a/xen/arch/x86/cpuid.c +++ b/xen/arch/x86/cpuid.c @@ -157,7 +157,7 @@ static void cpuid_hypervisor_leaves(const struct vcpu *= v, uint32_t leaf, break; =20 case 5: /* PV-specific parameters */ - if ( is_hvm_domain(d) || subleaf !=3D 0 ) + if ( !is_pv_domain(d) || subleaf !=3D 0 ) break; =20 res->b =3D flsl(get_upper_mfn_bound()) + PAGE_SHIFT; --=20 2.53.0