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helo=lists.xenproject.org; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C From: Michal Orzel To: CC: Michal Orzel , Stefano Stabellini , Julien Grall , Bertrand Marquis , Volodymyr Babchuk Subject: [PATCH] xen/arm: Handle empty grant table region in find_unallocated_memory() Date: Thu, 24 Aug 2023 11:06:40 +0200 Message-ID: <20230824090640.25338-1-michal.orzel@amd.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF00026367:EE_|IA1PR12MB6651:EE_ X-MS-Office365-Filtering-Correlation-Id: 902b5b13-5fa8-4051-d358-08dba4817060 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(4636009)(396003)(376002)(136003)(39860400002)(346002)(451199024)(186009)(1800799009)(82310400011)(46966006)(40470700004)(36840700001)(86362001)(40460700003)(36756003)(40480700001)(44832011)(1076003)(5660300002)(26005)(2616005)(426003)(336012)(4326008)(47076005)(8936002)(8676002)(2906002)(83380400001)(478600001)(70586007)(70206006)(316002)(6916009)(54906003)(41300700001)(356005)(81166007)(82740400003)(36860700001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Aug 2023 09:06:44.5562 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 902b5b13-5fa8-4051-d358-08dba4817060 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF00026367.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6651 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1692868039203100001 Content-Type: text/plain; charset="utf-8" When creating dom0 with grant table support disabled in Xen and no IOMMU, the following assert is triggered (debug build): "Assertion 's <=3D e' failed at common/rangeset.c:189" This is because find_unallocated_memory() (used to find memory holes for extended regions) calls rangeset_remove_range() for an empty grant table region. Fix it by checking if the size of region is not 0. Signed-off-by: Michal Orzel Reviewed-by: Julien Grall --- xen/arch/arm/domain_build.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index 54bf5623c889..2e899458acdf 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -1633,14 +1633,18 @@ static int __init find_unallocated_memory(const str= uct kernel_info *kinfo, } =20 /* Remove grant table region */ - start =3D kinfo->gnttab_start; - end =3D kinfo->gnttab_start + kinfo->gnttab_size; - res =3D rangeset_remove_range(unalloc_mem, PFN_DOWN(start), PFN_DOWN(e= nd - 1)); - if ( res ) + if ( kinfo->gnttab_size ) { - printk(XENLOG_ERR "Failed to remove: %#"PRIpaddr"->%#"PRIpaddr"\n", - start, end); - goto out; + start =3D kinfo->gnttab_start; + end =3D kinfo->gnttab_start + kinfo->gnttab_size; + res =3D rangeset_remove_range(unalloc_mem, PFN_DOWN(start), + PFN_DOWN(end - 1)); + if ( res ) + { + printk(XENLOG_ERR "Failed to remove: %#"PRIpaddr"->%#"PRIpaddr= "\n", + start, end); + goto out; + } } =20 start =3D 0; --=20 2.25.1