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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by BN3PEPF0000B077.mail.protection.outlook.com (10.167.243.122) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.315.6 via Frontend Transport; Thu, 6 Aug 2026 02:14:42 +0000 Received: from satlexmb08.amd.com (10.181.42.217) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.41; Wed, 5 Aug 2026 21:14:42 -0500 Received: from [172.19.79.34] (10.180.168.240) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server id 15.2.2562.41 via Frontend Transport; Wed, 5 Aug 2026 21:14:41 -0500 Message-ID: Date: Wed, 5 Aug 2026 21:51:34 -0400 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/4] xen: Drop CONFIG_XEN_PVHVM To: Juergen Gross , Andrew Cooper , , CC: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Boris Ostrovsky , Stefano Stabellini , Oleksandr Tyshchenko , References: <20260805082137.1214967-1-jgross@suse.com> <20260805082137.1214967-3-jgross@suse.com> <7179e004-76df-42be-94fd-f314614e65cd@citrix.com> <15824536-dff6-426d-b54c-6a1f362adaa2@suse.com> Content-Language: en-US From: Jason Andryuk In-Reply-To: <15824536-dff6-426d-b54c-6a1f362adaa2@suse.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B077:EE_|CY8PR12MB7708:EE_ X-MS-Office365-Filtering-Correlation-Id: 117afe2a-f8f9-4b26-fe0c-08def3607a3c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|23010399003|82310400026|36860700016|1800799024|18002099003|22082099003|4143699003|10067099003|11063799006|56012099006; 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:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(376014)(7416014)(23010399003)(82310400026)(36860700016)(1800799024)(18002099003)(22082099003)(4143699003)(10067099003)(11063799006)(56012099006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: xv+R/7yqZcLhE13Vq5fJu6lI/PUV0ZrbwRUN3fsGyVgHHPPr28PVk3tfIO/AK+uUlExFxHVBmJc+DtrVA2lkZeb4RFLP32314BcaPX3YbYmU6AA1AW5ieBLbzxW7EbsWCbiBWjo9Ul/vbZFWT1KWbQXehjZVb7yo6nj3gOAgRN1m4wmdlrqdwz+uMf5mzyveFSVJuX4FtguRLRqViS+PTJ4M8rTcBePhyIerZeM4V4T4iEmAf5dIV30iplNR7CmpNL0ETPHMh/5SC1ppzRkpJrYiyiUwi+lDpTSsGoRmloLfvzXB5sjfg7MzT8z0IlOXhp/ite4nFCxEIBIRz9A575rOUAiGKWxzyy4aAv/gVfoVL66vWFhp2QYdUKIyHjQhwguoNSDxeMQBo7pq6+a1e+MJ6wl4jPQ9fZFDmGs6rtHM0+3EADBW7lHgqqFinMmZ X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Aug 2026 02:14:42.5971 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 117afe2a-f8f9-4b26-fe0c-08def3607a3c 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN3PEPF0000B077.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7708 On 2026-08-05 04:36, Juergen Gross wrote: > On 05.08.26 10:28, Andrew Cooper wrote: >> On 05/08/2026 9:21 am, Juergen Gross wrote: >>> On x86 CONFIG_XEN_PVHVM is now a synonym of CONFIG_XEN. >>> >>> In Xen specific x86 code it can be just dropped, in non-Xen specific >>> x86 code it can be replaced with CONFIG_XEN. >>> >>> In architecture independent code it is used only where CONFIG_XEN is >>> defined, so it can be replaced with CONFIG_X86 there. >>> >>> Signed-off-by: Juergen Gross >>> >>> diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/ >>> idtentry.h >>> index 20f548702404..f400cfac69a6 100644 >>> --- a/arch/x86/include/asm/idtentry.h >>> +++ b/arch/x86/include/asm/idtentry.h >>> @@ -745,7 +745,7 @@ >>> DECLARE_IDTENTRY_SYSVEC(HYPERV_STIMER0_VECTOR, >>> sysvec_hyperv_stimer0); >>>   DECLARE_IDTENTRY_SYSVEC(HYPERVISOR_CALLBACK_VECTOR, >>> sysvec_acrn_hv_callback); >>>   #endif >>> -#ifdef CONFIG_XEN_PVHVM >>> +#ifdef CONFIG_XEN >>>   DECLARE_IDTENTRY_SYSVEC(HYPERVISOR_CALLBACK_VECTOR, >>> sysvec_xen_hvm_callback); >>>   #endif >> >> I'm very happy to see a reduction in the number of Kconfig symbols for >> Xen (there are definitely too many), but this looks wonky. >> >> Or are you saying that there really is no way to build a Xen PV guest >> excluding the HVM-only bits? > > Seems so, yes. > > This has been like this for at least several years now. > > What you can do is to configure the kernel to exclude the Xen platform PCI > device (CONFIG_XEN_PVHVM_GUEST=n). I think I caused this inadvertently in 34aff14580d1 ("xen: Remove Xen PVH/PVHVM dependency on PCI") CONFIG_XEN_PVHVM should just be bool, and then XEN_PVH & XEN_PVHVM_GUEST can select it. Then it can be disabled for a PV only build. I'll send it out, so you can evaluate it. Regards, Jason