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Peter Anvin" , Suresh Siddha , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Ajay Kaher , Alexey Makhalov , Broadcom internal kernel review list , Jan Kiszka , Paolo Bonzini , Vitaly Kuznetsov , Juergen Gross , Boris Ostrovsky References: <20260202-x2apic-fix-v1-0-71c8f488a88b@sony.com> <20260202-x2apic-fix-v1-2-71c8f488a88b@sony.com> Content-Language: en-GB From: Andrew Cooper In-Reply-To: <20260202-x2apic-fix-v1-2-71c8f488a88b@sony.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: LO4P265CA0284.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:38f::9) To CH8PR03MB8275.namprd03.prod.outlook.com (2603:10b6:610:2b9::7) Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH8PR03MB8275:EE_|LV4PR03MB8187:EE_ X-MS-Office365-Filtering-Correlation-Id: 0f063a44-8b77-4480-aa43-08de624f34cc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|10070799003|1800799024|7416014|366016|376014|921020; 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There is no such dependency.  VMs for example commonly have x2APIC and no IOMMU, and even native system with fewer than 254 CPUs does not need interrupt remapping for IO-APIC interrupts to function correctly. For native systems with 255 or more CPUs you do want Interrupt Remapping so enabling it in defconfig is a good move, but the justification needs correcting. ~Andrew