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Wed, 22 Nov 2023 16:35:35 -0800 From: To: , , , , , , , , , , , , , , , , CC: , , , , , , , , , , , , , , , , Subject: [PATCH v2 2/4] mm: Add poison error check in fixup_user_fault() for mapped pfn Date: Thu, 23 Nov 2023 06:05:10 +0530 Message-ID: <20231123003513.24292-3-ankita@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20231123003513.24292-1-ankita@nvidia.com> References: <20231123003513.24292-1-ankita@nvidia.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF0002BA51:EE_|IA1PR12MB8518:EE_ X-MS-Office365-Filtering-Correlation-Id: 41f53125-461b-4c1f-db98-08dbebbc2911 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:216.228.117.161; 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Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF0002BA51.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB8518 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 231711efa390..b78af20a0f52 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -1414,7 +1414,7 @@ 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 486800a7024b..2ff067f21a7c 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2731,6 +2731,12 @@ 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 {