From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from CY7PR03CU001.outbound.protection.outlook.com (mail-westcentralusazon11010052.outbound.protection.outlook.com [40.93.198.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 30A4E36F415; Fri, 21 Aug 2026 15:57:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.93.198.52 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787327835; cv=fail; b=AxfZoSElJCKK/a1TJD99iWXAhSp+ZHZ3NOsh5FKa8uJoYmFIez4fxfEKBmHVOahDt82TZEaEvTA59yOWYwLjN5Hfkxu+vW0vUMQ3cb5PkWpZNE6WN3ixXubZVUqxBsV+QiHsnHKm89dbxyp5l3wWOBvIoU55of8ZtmhAOgjI33g= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787327835; c=relaxed/simple; bh=j2DZ0izb/B1ZUYXTGyAmPc/G/8KyRXn7+GQ3KL/RLEc=; h=Message-ID:Date:Subject:To:References:From:In-Reply-To: Content-Type:MIME-Version; b=IPgGn01NBi+h4o+EgqF2XroldynDJ+DSafdAU+Oqb0gCQ/ayP05brEfHKnzYuJmf8Pt0x9w7/qe4BQje7hapwPvK8Q3fbfjpvwtAPy83AQgjVG+vXq9VJCqQOS9G2QH+NhXkfVElIFWydKrX5UIGUN3ymULRylJUtm4x/U/quks= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=htwGdy6C; arc=fail smtp.client-ip=40.93.198.52 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="htwGdy6C" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=VbZjEtHZFNcu9S1b7fK/OWoJkO2TrqO7MEJaRkQq3nW9ngqdm8Dh9Y23XViN9Hg5oyRTabeI0ZgfN8MR2CAwiNlPhOKEL88F2xfI+wRbIWshIrDKbEkO/jSD4or8s1gwBO1DRAlhSEOzYB1mrQPvnG+S/5OTRoe8FvNgF/mPjSw5mQ2bteJ3OhBMtWtHH4wAZyFyulKJE1hIsAskMvW0M6GssCQTrxTz8Lp+1i+UNXmuKJ2rg73YkQHcvsyiclxNdIcozVsbsv1THpHnUUyFDdPcCSYQNXUB/FS/c3m40TLLQT4lsH4PE8X5wIwkfpYDsRI8R6hskzCnmT7n8x9/Mg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=W5cxpxBK8r7i44qID8v5iWFEv531cG8tjKhpPoMjpHs=; b=JwjnCxwsmQr1b45bYES/olfcN1oFRWoqrSVbiSfIrv8gb48Wtlvt6IFN+3Q/DaUHLlFqUbBPEHy8Pdb6v4pLUmgMAk25Znnz6+edQtQVvEfDXPouVwjFxpDU4Y4jF5hKaVzjrgLNOWKpN9jj+qocHsotiCVROWDweNMK2NW26XGaJnMT3k7AW8eDLw/tUm1YJyVsYqTolhZY6VWDv+s1GBjq5uqrYJiZ1qWvUoP8DNC5f9AM9K7VA+1yV8tNy2h08fQcQb6lbmUF0rDxf252u+KuOJJuLdKKEjLWiNvF38QORtMTFAJR7XAAORokR7H+UbeDzTDsprQR7sL/CHxMsA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amd.com; dmarc=pass action=none header.from=amd.com; dkim=pass header.d=amd.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=W5cxpxBK8r7i44qID8v5iWFEv531cG8tjKhpPoMjpHs=; b=htwGdy6CkMUXs1urfEn++9Xjg2Pp3kUIhai4njPAMWa4XJlsbKGagt37HhJeEBigTw0/y1UWW/CjgZliUturNYtwLcGOV8OjUaGBTZCzslLCEeDpQbQoQrKNY8TZPKAvtNgmP8Ec4sSkW5Uajtigvn9RGqblMk5C0h5K8yqGxqY= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from BL4PR12MB9505.namprd12.prod.outlook.com (2603:10b6:208:591::16) by DM4PR12MB8558.namprd12.prod.outlook.com (2603:10b6:8:187::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.339.10; Fri, 21 Aug 2026 15:57:08 +0000 Received: from BL4PR12MB9505.namprd12.prod.outlook.com ([fe80::73aa:eb8c:a86b:5a83]) by BL4PR12MB9505.namprd12.prod.outlook.com ([fe80::73aa:eb8c:a86b:5a83%5]) with mapi id 15.21.0339.010; Fri, 21 Aug 2026 15:57:05 +0000 Message-ID: Date: Fri, 21 Aug 2026 21:26:51 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 4/7] iommu/amd: Program guest-mode IRTEs for GAPPI wakeup when IRTE[IsRun] = 0 To: Sairaj Kodilkar , "Borislav Petkov (AMD)" , "H. Peter Anvin" , "Joerg Roedel (AMD)" , "Paul E. McKenney" , Andrew Morton , Breno Leitao , Christian Brauner , Dapeng Mi , Dave Hansen , Eric Biggers , Ingo Molnar , Jakub Kicinski , Jonathan Corbet , Kiryl Shutsemau , Li RongQing , Marco Elver , Paolo Bonzini , Rick Edgecombe , Robin Murphy , Sean Christopherson , Shuah Khan , Suravee Suthikulpanit , Thomas Gleixner , Will Deacon , iommu@lists.linux.dev, kvm@vger.kernel.org, linux-coco@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org References: <20260821055611.27138-1-sarunkod@amd.com> <20260821055611.27138-5-sarunkod@amd.com> Content-Language: en-US From: Vasant Hegde In-Reply-To: <20260821055611.27138-5-sarunkod@amd.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MA5P287CA0304.INDP287.PROD.OUTLOOK.COM (2603:1096:a01:21e::16) To BL4PR12MB9505.namprd12.prod.outlook.com (2603:10b6:208:591::16) Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL4PR12MB9505:EE_|DM4PR12MB8558:EE_ X-MS-Office365-Filtering-Correlation-Id: bccaa513-1778-4d9b-0d24-08deff9cd89b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|23010399003|1800799024|366016|921020|56012099006|10067099003|11063799006|4143699003|18002099003|22082099003; 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Per the AMD IOMMU specification [1] > (section 2.2.5.4), with GAPPI enabled the IOMMU delivers a physical APIC > interrupt to the CPU described by IRTE[Destination], using > IRTE[GATag][7:0] as the vector, while still updating the guest vAPIC > backing page IRR as usual. > > The AMD IOMMU also allows suppressing GAPPI interrupts using the > IRTE[GAPPIDis] bit when the GAPPIDisSup feature is available in > extended feature register 2. The AMD IOMMU driver sets this bit when > the wakeup_intr flag is not set by KVM. > > Note: amd_iommu_gappi is currently false; a later patch enables it via > the kernel command line. > > [1] https://docs.amd.com/v/u/en-US/48882_3.11_IOMMU_PUB > > Signed-off-by: Sairaj Kodilkar Reviewed-by: Vasant Hegde -Vasant