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Wed, 5 Apr 2023 11:01:35 -0700 From: To: , , , , , CC: , , , , , , , , , , , , Subject: [PATCH v3 4/6] mm: Add poison error check in fixup_user_fault() for mapped PFN Date: Wed, 5 Apr 2023 11:01:32 -0700 Message-ID: <20230405180134.16932-5-ankita@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230405180134.16932-1-ankita@nvidia.com> References: <20230405180134.16932-1-ankita@nvidia.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT045:EE_|MN0PR12MB6271:EE_ X-MS-Office365-Filtering-Correlation-Id: d58cd556-1e24-452b-abca-08db35ffd3c6 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:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230028)(4636009)(39860400002)(346002)(376002)(136003)(396003)(451199021)(46966006)(40470700004)(36840700001)(2876002)(2906002)(82310400005)(36756003)(86362001)(36860700001)(40480700001)(2616005)(336012)(47076005)(186003)(426003)(83380400001)(6666004)(1076003)(26005)(8676002)(70586007)(478600001)(70206006)(40460700003)(5660300002)(4326008)(82740400003)(356005)(41300700001)(110136005)(316002)(8936002)(7636003)(54906003);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Apr 2023 18:01:48.8221 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d58cd556-1e24-452b-abca-08db35ffd3c6 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT045.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR12MB6271 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230405_110156_785089_AB45F750 X-CRM114-Status: GOOD ( 13.71 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Ankit Agrawal The fixup_user_fault() currently does not expect a VM_FAULT_HWPOISON and hence does not check for it while calling vm_fault_to_errno(). Since we now have a new code path which can trigger such case, change fixup_user_fault to look for VM_FAULT_HWPOISON. Also make hva_to_pfn_remapped check for -EHWPOISON and communicate the poison fault up to the user_mem_abort(). Signed-off-by: Ankit Agrawal --- mm/gup.c | 2 +- virt/kvm/kvm_main.c | 6 ++++++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/mm/gup.c b/mm/gup.c index eab18ba045db..507a96e91bad 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -1290,7 +1290,7 @@ int fixup_user_fault(struct mm_struct *mm, } if (ret & VM_FAULT_ERROR) { - int err = vm_fault_to_errno(ret, 0); + int err = vm_fault_to_errno(ret, FOLL_HWPOISON); if (err) return err; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d255964ec331..09b6973e679d 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2688,6 +2688,12 @@ kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool interruptible, r = hva_to_pfn_remapped(vma, addr, write_fault, writable, &pfn); if (r == -EAGAIN) goto retry; + + if (r == -EHWPOISON) { + pfn = KVM_PFN_ERR_HWPOISON; + goto exit; + } + if (r < 0) pfn = KVM_PFN_ERR_FAULT; } else {