From nobody Thu Sep 24 19:43:25 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; arc=pass (i=1 dmarc=pass fromdomain=citrix.com); dmarc=pass(p=reject dis=none) header.from=citrix.com ARC-Seal: i=2; a=rsa-sha256; t=1789058474; cv=pass; d=zohomail.com; s=zohoarc; b=MaAAe/RAytPH3pk1z6C0FCmCUZ4BQRWhgFjw+2y+ROl7RUozaR+CSEq8MyUMm7kalcB7EkGcR7+xHH0vFTXVzbj9uzfUN822XTzCAlxNPFvdmkGapQo6YflfGmCAb+kY1gA6G8iBYqSBw6Q8FFaQpR+oiS3opKScjlLJDoZFXF4= ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1789058474; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=EN+seTtA71auXJ8SVZ2qyGkvZ0DPlUOwnVfxlApHbf0=; b=g9rXpiDr0XDfdfZ1nBEAunIIYmHktxLcX40X/OWLtEXFZShUaj/YBkaRzIYJPKtd2hRGGvl/6JuwiiQ0ZDtev5PBJAf/bYSgtctqsO5eaKM02sJ1aIxHXtiH/pI3/MBsmWKniCrHbm4qf/5uNFiW4wJNzdosH9DzP2MrYgbVPlA= ARC-Authentication-Results: i=2; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; arc=pass (i=1 dmarc=pass fromdomain=citrix.com); dmarc=pass header.from= (p=reject dis=none) Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1789058474240989.6844062816692; Thu, 10 Sep 2026 09:41:14 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.1415007.1644606 (Exim 4.92) (envelope-from ) id 1x4hpI-0000Ck-21; Thu, 10 Sep 2026 16:40:40 +0000 Received: by outflank-mailman (output) from mailman id 1415007.1644606; Thu, 10 Sep 2026 16:40:40 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1x4hpH-0000Cd-Vc; Thu, 10 Sep 2026 16:40:39 +0000 Received: by outflank-mailman (input) for mailman id 1415007; Thu, 10 Sep 2026 16:40:38 +0000 Received: from mx.expurgate.net ([195.190.135.20]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1x4hpG-0000CW-Ej for xen-devel@lists.xenproject.org; Thu, 10 Sep 2026 16:40:38 +0000 Received: from mx.expurgate.net (helo=localhost) by mx.expurgate.net with esmtp id 1x4hpA-003J9P-49 for xen-devel@lists.xenproject.org; Thu, 10 Sep 2026 18:40:37 +0200 Received: from [10.42.69.2] (helo=localhost) by localhost with ESMTP (eXpurgate MTA 0.9.1) (envelope-from ) id 6aa2dd73-bab6-0a2a0a5309dd-0a2a4502d94a-18 for ; Thu, 10 Sep 2026 18:40:32 +0200 Received: from [40.107.208.23] (helo=PH0PR06CU001.outbound.protection.outlook.com) by tlsNG-720697.mxtls.expurgate.net with ESMTPS (eXpurgate 4.57.1) (envelope-from ) id 6aa2dd7e-6ca4-0a2a45020019-286bd017479a-3 for ; Thu, 10 Sep 2026 18:40:31 +0200 Received: from CH8PR03MB8274.namprd03.prod.outlook.com (2603:10b6:610:2ba::5) by SJ2PR03MB7527.namprd03.prod.outlook.com (2603:10b6:a03:559::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.406.9; Thu, 10 Sep 2026 16:40:28 +0000 Received: from CH8PR03MB8274.namprd03.prod.outlook.com ([fe80::ebe2:32c1:d2be:a096]) by CH8PR03MB8274.namprd03.prod.outlook.com ([fe80::ebe2:32c1:d2be:a096%4]) with mapi id 15.21.0406.005; Thu, 10 Sep 2026 16:40:27 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" Authentication-Results: eu.smtp.expurgate.cloud; dkim=pass header.s=selector1 header.d=citrix.com header.i="@citrix.com" header.h="From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=W3aes8S04P1I6EKgXB/du7fQHg2nOCfPrtdlVWHmLysZgdG0oOPc7Oyd8+vh6yhQIo9Al+oKEeTusnQnk5XYBMw6aHLfR1lQN9n+AFZLv9r+2WKyovgcK7Hs9pQiDxnvO45YfusKlBHz9SLdqirrCOJAiA4pTrnjwJOLqoJuqO9BOs1/1F1YJccvh0kHtgIZCodILqkGvt/W2SHOg2R7ZqtbxTGynl/aixn0z3n6O45EsFr1fcYnMZGLel63VlmpwCuKBBSESeE5+Pza9gQv1Js4g5ea9MzOs6lEkzwxpRDMLDqhPxC6c7lP3XqqXV3hS4c5Kum66GsJcuHOVPBboA== 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=EN+seTtA71auXJ8SVZ2qyGkvZ0DPlUOwnVfxlApHbf0=; b=IqXURYwR2WyxWtQKZQOZy13lKDYPNeZV0ZbfibmfJtPZwl7jQZsZwK8RFbNAX3SdUqEuFu0owNBEgPVSgMF38XPrvdvKTltH33tOdQ2MPWL/3qaOJLo2LUnaDgRmKV/dXFpW4oal9TMoKuGY4qpcSYLEYTTvD+YD9DZzFeHGfXmp8yJ2xyUQ0Pu3NptCsYAr+Y64tcdm7WyMXBZpr5OmXoRNdcBos79O4Ifs8FrzviU/NuBlvrYcmiXxyErrTtk3e3vIWoKOEBojkNcL2WQ9fLP/gkl4gbS4takn9oM7tAackZ2YsAUdrTdWT/nh4zaj/Jb050+YkCJLrwfIrUHvIQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=citrix.com; dmarc=pass action=none header.from=citrix.com; dkim=pass header.d=citrix.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=citrix.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=EN+seTtA71auXJ8SVZ2qyGkvZ0DPlUOwnVfxlApHbf0=; b=mNN0cJ3hlcA5qr9ptVPHqrK6sGyUpKKh0S0JVq/yEA5hMC5AFm0liol97NXNDIA2LGcL+97fFl09A6O3xCIjEGasO76KnX0Az/8BVbOGYNybYgWuAmlqwacAgI/SmiflfZ7jEUhI8QLk+gNG1lk5KKLNELklJ4X2RBidtdyDUv8= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=citrix.com; From: Ross Lagerwall To: xen-devel@lists.xenproject.org Cc: Ross Lagerwall , Jan Beulich , Andrew Cooper , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Jason Andryuk , Teddy Astie Subject: [PATCH v1] nestedsvm: Fix multi-byte IO port intercept check Date: Thu, 10 Sep 2026 17:39:55 +0100 Message-ID: <20260910163955.1005097-1-ross.lagerwall@citrix.com> X-Mailer: git-send-email 2.53.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: AS9PR04CA0112.eurprd04.prod.outlook.com (2603:10a6:20b:531::13) To CH8PR03MB8274.namprd03.prod.outlook.com (2603:10b6:610:2ba::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH8PR03MB8274:EE_|SJ2PR03MB7527:EE_ X-MS-Office365-Filtering-Correlation-Id: 4fab52ff-3969-4efc-8e9e-08df0f5a3858 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|1800799024|366016|376014|10067099003|18002099003|56012099006|11063799006; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH8PR03MB8274.namprd03.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(23010399003)(1800799024)(366016)(376014)(10067099003)(18002099003)(56012099006)(11063799006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?a3n+8p+IueQctOMf1Sn4t19JJtT+MSPncgbt4874lCLn5A2Iz63PjlNqgHPg?= =?us-ascii?Q?RT/tiv7HAmbcWR7bdZUKcRrROs5hZchRkAq5j5jl11KnsU5re9Sc9/BjprcK?= =?us-ascii?Q?NjLr+whvUpAfdZd3AuEjeUdTu7ZG+3sMisNq8HCau/yK441DOTrsLtnjybIt?= =?us-ascii?Q?0NNIFlz6923lEW2IYwEahCVigtfFwGlVl0JGlBz8pURo4gsn5kGunQqUgju0?= =?us-ascii?Q?MdMynwmFYoWeVVIOS4J1g0wVJGm7yVUcAWhBPpM5VmGJ4pbs7eKdeMtyJu+t?= =?us-ascii?Q?9A/MfH2SU3DN4ZQgsEAF65hBmsfq0YCaDxTw9Fc5R8EAsSFjLiXiw3F56jUB?= =?us-ascii?Q?TA0RHF/gql+fwx3FTZxaVClJQwHNZMaVg7TpqONxszvnojI0NbVmLrC+Hka2?= =?us-ascii?Q?eoke8VQ0EFWjnnjsXvTgTyfCEDNrXz/lXjWlAbIO1yQxXEwa5/iP9FC7+M9s?= =?us-ascii?Q?vZtSfCflqU1e/Av7BOE63q2vSIP1A3pEXwLklAy/6cyWecyMAYlqa4E4T190?= =?us-ascii?Q?3/vk60Oy9pVmrhA+SSpFhtPjMyzztRp8vETwIPCX4t8cnaQ5xFKzCl/T9swA?= =?us-ascii?Q?mI+R0Jgz0In7votKni9XJwCWqgA5Z7b1KIR7hm2UTYQGSoYr85cGUgWC5UeM?= =?us-ascii?Q?ZaMVqdsXqVCEF1yh3vfwwElP0s8trZd8jZBz7RGoB5UWcjsF+wCF35zmSRdN?= =?us-ascii?Q?D+rSP3qrKo+NygaWcfYd0FY7wipAkvbULMDLslMvNg5b4liBKOnqBzHEQeVn?= =?us-ascii?Q?mNRRXqrAHVxbuLU/29/4cIUweyd2ZjrTVdnhF/it45qZFfzfCxqxu1/hKXLe?= =?us-ascii?Q?f0T0dtGH+n0osw3JS1v/sGrx0uLj6u9vCNj2qytMKqADxRU6mVnBqx27u70t?= =?us-ascii?Q?/hqBOqjDAUTmpol2GHbisRnQeBzCdLVnJf2mqaEr2fU893O+AWWC7fkOdkVY?= =?us-ascii?Q?RFwbn9pVkkgIxuYcfqxjg2KRnjrx6DyQEJX6VVqF8azkuLRCxu74WuwZU35o?= =?us-ascii?Q?MtNIbjw+24424YYd2dF4MaFN30R/QFixCKRG3e5KeSWY1pmMNAtDvRUgwb/2?= =?us-ascii?Q?+mZUtJxsQ6swjh2tMltahWNshWgTLCKE20b5c3VwxJWowcaVSyIhiPpqOABi?= =?us-ascii?Q?vMD6zGpEaOYGdB7T0b7lsUEEg8svxdx4R2dmAKySmBdGtKdbsPvTvOg+NOFU?= =?us-ascii?Q?O7xDnHDHjSPWquWAeZiZOwM1t527L2I3AG0W4ReCko3CzY0iOdaQu/tYovOM?= =?us-ascii?Q?mTcWNlNa+9VB2bcdqbiscl2SboLIMnpgD3ICX8IqVeGAZusWvTpc/gXWKghy?= =?us-ascii?Q?y2D9Zj2oi4A201e8wzfjxcHiPoMvvz0SuV1xEitQwrXON+gkmYTvSaxBgjCc?= =?us-ascii?Q?tHcnxowoN9xaD0E75ntchAFOdju+nIQR/lPiUwqUKpQzPBcKP7KMUnPN4pHn?= =?us-ascii?Q?EekL48s7u3k0r28Rlnyw6rZUCpJpB/h36GnBllEOlWSwePwnhosTUR11O1rk?= =?us-ascii?Q?7anjImZ5NXv4a5Hw+WNY+090VSCGs27pnW8mcWr6k4Ces8UigjLs0i2QMEjW?= =?us-ascii?Q?4vmx/UVNNfYbV1l7uqFY3Y3L7o6N9GOkYKDG+Fi4vGqwj4vQkncB8NUctwLI?= =?us-ascii?Q?GcaoO1/Ply3xJcYmYQJhDHrirC8coRUazU1WCsKWgQUTwNJpNmV+HKgSmQVr?= =?us-ascii?Q?+ZQtSAYpqGUxEpCaGy5WMRLfMwnrVd7IIayMQXOz/HcwaZOBnllr7XbDJ+fp?= =?us-ascii?Q?YViVAtcb/8EXja09ESNZ/TVUJi/ESCk=3D?= X-OriginatorOrg: citrix.com X-MS-Exchange-CrossTenant-Network-Message-Id: 4fab52ff-3969-4efc-8e9e-08df0f5a3858 X-MS-Exchange-CrossTenant-AuthSource: CH8PR03MB8274.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Sep 2026 16:40:27.8982 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 335836de-42ef-43a2-b145-348c2ee9ca5b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: C0Dl+u4jd/Mulj/T6+8wXRreBIii8rVWMvaMhrDyFhUhqItb13whwrMwBl3AGGPzXcg2pCrObdXObQYUaSDnEs85ooLGcO8k3hkwgIyknTA= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR03MB7527 X-purgate-ID: tlsNG-720697/1789058432-F10A02AC-18BA0FFF/0/0 X-purgate-type: clean X-purgate-size: 1261 X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1789058476521158500 Content-Type: text/plain; charset="utf-8" For multi-byte IO port accesses, the APM says that SVM should intercept if any of the corresponding permission bits are set. However, the code has this backwards and only intercepts if all the permission bits are set. This affects Hyper-V since it does not generally set all the permission bits of the multi-byte ports it allows its root partition to access. This results in an L2 root partition that cannot do PCI config space accesses and therefore cannot access its NVMe disk to continue booting. Signed-off-by: Ross Lagerwall --- xen/arch/x86/hvm/svm/nestedsvm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/arch/x86/hvm/svm/nestedsvm.c b/xen/arch/x86/hvm/svm/nested= svm.c index 5adb1bd72c4d..249fde43b5be 100644 --- a/xen/arch/x86/hvm/svm/nestedsvm.c +++ b/xen/arch/x86/hvm/svm/nestedsvm.c @@ -852,7 +852,7 @@ nsvm_vmcb_guest_intercepts_ioio(paddr_t iopm_pa, uint64= _t exitinfo1) for ( io_bitmap =3D hvm_map_guest_frame_ro(gfn, 0); ; ) { enabled =3D io_bitmap && test_bit(port, io_bitmap); - if ( !enabled || !--size ) + if ( enabled || !--size ) break; if ( unlikely(++port =3D=3D 8 * PAGE_SIZE) ) { --=20 2.53.0