From: Srivatsa Vaddagiri <quic_svaddagi@quicinc.com> To: Elliot Berman <quic_eberman@quicinc.com> Cc: Alex Elder <elder@linaro.org>, Srinivas Kandagatla <srinivas.kandagatla@linaro.org>, Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>, Murali Nalajala <quic_mnalajal@quicinc.com>, Trilok Soni <quic_tsoni@quicinc.com>, Carl van Schaik <quic_cvanscha@quicinc.com>, Dmitry Baryshkov <dmitry.baryshkov@linaro.org>, Bjorn Andersson <andersson@kernel.org>, Konrad Dybcio <konrad.dybcio@linaro.org>, Arnd Bergmann <arnd@arndb.de>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Rob Herring <robh+dt@kernel.org>, "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>, Jonathan Corbet <corbet@lwn.net>, Bagas Sanjaya <bagasdotme@gmail.com>, Catalin Marinas <catalin.marinas@arm.com>, Jassi Brar <jassisinghbrar@gmail.com>, <linux-arm-msm@vger.kernel.org>, <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-doc@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org> Subject: Re: [PATCH v10 13/26] gunyah: vm_mgr: Add ioctls to support basic non-proxy VM boot Date: Mon, 20 Feb 2023 14:45:44 +0530 [thread overview] Message-ID: <20230220091544.GN332@quicinc.com> (raw) In-Reply-To: <20230214212427.3316544-1-quic_eberman@quicinc.com> * Elliot Berman <quic_eberman@quicinc.com> [2023-02-14 13:24:26]: > static void gh_vm_free(struct work_struct *work) > { > struct gh_vm *ghvm = container_of(work, struct gh_vm, free_work); > struct gh_vm_mem *mapping, *tmp; > int ret; > > - mutex_lock(&ghvm->mm_lock); > - list_for_each_entry_safe(mapping, tmp, &ghvm->memory_mappings, list) { > - gh_vm_mem_reclaim(ghvm, mapping); > - kfree(mapping); > + switch (ghvm->vm_status) { > +unknown_state: > + case GH_RM_VM_STATUS_RUNNING: > + gh_vm_stop(ghvm); > + fallthrough; > + case GH_RM_VM_STATUS_INIT_FAILED: > + case GH_RM_VM_STATUS_LOAD: > + case GH_RM_VM_STATUS_LOAD_FAILED: > + mutex_lock(&ghvm->mm_lock); > + list_for_each_entry_safe(mapping, tmp, &ghvm->memory_mappings, list) { > + gh_vm_mem_reclaim(ghvm, mapping); > + kfree(mapping); > + } > + mutex_unlock(&ghvm->mm_lock); > + fallthrough; > + case GH_RM_VM_STATUS_NO_STATE: > + ret = gh_rm_dealloc_vmid(ghvm->rm, ghvm->vmid); > + if (ret) > + pr_warn("Failed to deallocate vmid: %d\n", ret); > + > + gh_rm_notifier_unregister(ghvm->rm, &ghvm->nb); > + put_gh_rm(ghvm->rm); > + kfree(ghvm); > + break; > + default: > + pr_err("VM is unknown state: %d, assuming it's running.\n", ghvm->vm_status); > + goto unknown_state; 'goto unknown_state' here leads to a infinite loop AFAICS. For example consider the case where VM_START failed (due to mem_lend operation) causing VM state to be GH_RM_VM_STATUS_RESET. A subsequent close(vmfd) can leads to that forever loop. //snip > +static int gh_vm_start(struct gh_vm *ghvm) > +{ > + struct gh_vm_mem *mapping; > + u64 dtb_offset; > + u32 mem_handle; > + int ret; > + > + down_write(&ghvm->status_lock); > + if (ghvm->vm_status != GH_RM_VM_STATUS_LOAD) { > + up_write(&ghvm->status_lock); > + return 0; > + } > + > + ghvm->vm_status = GH_RM_VM_STATUS_RESET; > + > + list_for_each_entry(mapping, &ghvm->memory_mappings, list) { We don't seem to have the right lock here while walking the list.
WARNING: multiple messages have this Message-ID (diff)
From: Srivatsa Vaddagiri <quic_svaddagi@quicinc.com> To: Elliot Berman <quic_eberman@quicinc.com> Cc: Alex Elder <elder@linaro.org>, Srinivas Kandagatla <srinivas.kandagatla@linaro.org>, Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>, Murali Nalajala <quic_mnalajal@quicinc.com>, Trilok Soni <quic_tsoni@quicinc.com>, Carl van Schaik <quic_cvanscha@quicinc.com>, Dmitry Baryshkov <dmitry.baryshkov@linaro.org>, Bjorn Andersson <andersson@kernel.org>, Konrad Dybcio <konrad.dybcio@linaro.org>, Arnd Bergmann <arnd@arndb.de>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Rob Herring <robh+dt@kernel.org>, "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>, Jonathan Corbet <corbet@lwn.net>, Bagas Sanjaya <bagasdotme@gmail.com>, Catalin Marinas <catalin.marinas@arm.com>, Jassi Brar <jassisinghbrar@gmail.com>, <linux-arm-msm@vger.kernel.org>, <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-doc@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org> Subject: Re: [PATCH v10 13/26] gunyah: vm_mgr: Add ioctls to support basic non-proxy VM boot Date: Mon, 20 Feb 2023 14:45:44 +0530 [thread overview] Message-ID: <20230220091544.GN332@quicinc.com> (raw) In-Reply-To: <20230214212427.3316544-1-quic_eberman@quicinc.com> * Elliot Berman <quic_eberman@quicinc.com> [2023-02-14 13:24:26]: > static void gh_vm_free(struct work_struct *work) > { > struct gh_vm *ghvm = container_of(work, struct gh_vm, free_work); > struct gh_vm_mem *mapping, *tmp; > int ret; > > - mutex_lock(&ghvm->mm_lock); > - list_for_each_entry_safe(mapping, tmp, &ghvm->memory_mappings, list) { > - gh_vm_mem_reclaim(ghvm, mapping); > - kfree(mapping); > + switch (ghvm->vm_status) { > +unknown_state: > + case GH_RM_VM_STATUS_RUNNING: > + gh_vm_stop(ghvm); > + fallthrough; > + case GH_RM_VM_STATUS_INIT_FAILED: > + case GH_RM_VM_STATUS_LOAD: > + case GH_RM_VM_STATUS_LOAD_FAILED: > + mutex_lock(&ghvm->mm_lock); > + list_for_each_entry_safe(mapping, tmp, &ghvm->memory_mappings, list) { > + gh_vm_mem_reclaim(ghvm, mapping); > + kfree(mapping); > + } > + mutex_unlock(&ghvm->mm_lock); > + fallthrough; > + case GH_RM_VM_STATUS_NO_STATE: > + ret = gh_rm_dealloc_vmid(ghvm->rm, ghvm->vmid); > + if (ret) > + pr_warn("Failed to deallocate vmid: %d\n", ret); > + > + gh_rm_notifier_unregister(ghvm->rm, &ghvm->nb); > + put_gh_rm(ghvm->rm); > + kfree(ghvm); > + break; > + default: > + pr_err("VM is unknown state: %d, assuming it's running.\n", ghvm->vm_status); > + goto unknown_state; 'goto unknown_state' here leads to a infinite loop AFAICS. For example consider the case where VM_START failed (due to mem_lend operation) causing VM state to be GH_RM_VM_STATUS_RESET. A subsequent close(vmfd) can leads to that forever loop. //snip > +static int gh_vm_start(struct gh_vm *ghvm) > +{ > + struct gh_vm_mem *mapping; > + u64 dtb_offset; > + u32 mem_handle; > + int ret; > + > + down_write(&ghvm->status_lock); > + if (ghvm->vm_status != GH_RM_VM_STATUS_LOAD) { > + up_write(&ghvm->status_lock); > + return 0; > + } > + > + ghvm->vm_status = GH_RM_VM_STATUS_RESET; > + > + list_for_each_entry(mapping, &ghvm->memory_mappings, list) { We don't seem to have the right lock here while walking the list. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2023-02-20 9:16 UTC|newest] Thread overview: 222+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-02-14 21:12 [PATCH v10 00/26] Drivers for Gunyah hypervisor Elliot Berman 2023-02-14 21:12 ` Elliot Berman 2023-02-14 21:12 ` [PATCH v10 01/26] docs: gunyah: Introduce Gunyah Hypervisor Elliot Berman 2023-02-14 21:12 ` Elliot Berman 2023-02-23 23:41 ` Alex Elder 2023-02-23 23:41 ` Alex Elder 2023-03-01 0:00 ` Elliot Berman 2023-03-01 0:00 ` Elliot Berman 2023-02-14 21:12 ` [PATCH v10 02/26] dt-bindings: Add binding for gunyah hypervisor Elliot Berman 2023-02-14 21:12 ` Elliot Berman 2023-02-14 21:12 ` [PATCH v10 03/26] gunyah: Common types and error codes for Gunyah hypercalls Elliot Berman 2023-02-14 21:12 ` Elliot Berman 2023-02-23 21:58 ` Alex Elder 2023-02-23 21:58 ` Alex Elder 2023-03-02 1:40 ` Elliot Berman 2023-03-02 1:40 ` Elliot Berman 2023-03-02 7:18 ` Arnd Bergmann 2023-03-02 7:18 ` Arnd Bergmann 2023-02-14 21:12 ` [PATCH v10 04/26] virt: gunyah: Add hypercalls to identify Gunyah Elliot Berman 2023-02-14 21:12 ` Elliot Berman 2023-02-20 13:59 ` Srinivas Kandagatla 2023-02-20 13:59 ` Srinivas Kandagatla 2023-02-24 0:09 ` Alex Elder 2023-02-24 0:09 ` Alex Elder 2023-03-02 1:21 ` Elliot Berman 2023-03-02 1:21 ` Elliot Berman 2023-02-14 21:18 ` Elliot Berman 2023-02-14 21:18 ` Elliot Berman 2023-02-14 21:21 ` [PATCH v10 05/26] virt: gunyah: Identify hypervisor version Elliot Berman 2023-02-14 21:21 ` Elliot Berman 2023-02-14 21:23 ` [PATCH v10 06/26] virt: gunyah: msgq: Add hypercalls to send and receive messages Elliot Berman 2023-02-14 21:23 ` Elliot Berman 2023-02-24 0:15 ` Alex Elder 2023-02-24 0:15 ` Alex Elder 2023-02-24 21:24 ` Elliot Berman 2023-02-24 21:24 ` Elliot Berman 2023-02-14 21:23 ` [PATCH v10 07/26] mailbox: Add Gunyah message queue mailbox Elliot Berman 2023-02-14 21:23 ` Elliot Berman 2023-02-16 4:07 ` kernel test robot 2023-02-16 4:07 ` kernel test robot 2023-02-20 13:59 ` Srinivas Kandagatla 2023-02-20 13:59 ` Srinivas Kandagatla 2023-02-23 0:15 ` Elliot Berman 2023-02-23 0:15 ` Elliot Berman 2023-02-23 10:25 ` Srinivas Kandagatla 2023-02-23 10:25 ` Srinivas Kandagatla 2023-02-23 23:15 ` Elliot Berman 2023-02-23 23:15 ` Elliot Berman 2023-02-24 7:49 ` Srinivas Kandagatla 2023-02-24 7:49 ` Srinivas Kandagatla 2023-02-23 18:24 ` Alex Elder 2023-02-23 18:24 ` Alex Elder 2023-02-23 21:11 ` Alex Elder 2023-02-23 21:11 ` Alex Elder 2023-02-24 21:57 ` Elliot Berman 2023-02-24 21:57 ` Elliot Berman 2023-02-14 21:23 ` [PATCH v10 08/26] gunyah: rsc_mgr: Add resource manager RPC core Elliot Berman 2023-02-14 21:23 ` Elliot Berman 2023-02-16 6:43 ` Greg Kroah-Hartman 2023-02-16 6:43 ` Greg Kroah-Hartman 2023-02-16 17:40 ` Elliot Berman 2023-02-16 17:40 ` Elliot Berman 2023-02-17 7:37 ` Greg Kroah-Hartman 2023-02-17 7:37 ` Greg Kroah-Hartman 2023-02-22 22:52 ` Elliot Berman 2023-02-22 22:52 ` Elliot Berman 2023-02-20 18:10 ` Srinivas Kandagatla 2023-02-20 18:10 ` Srinivas Kandagatla 2023-02-22 23:18 ` Elliot Berman 2023-02-22 23:18 ` Elliot Berman 2023-02-23 10:29 ` Srinivas Kandagatla 2023-02-23 10:29 ` Srinivas Kandagatla 2023-02-23 23:13 ` Elliot Berman 2023-02-23 23:13 ` Elliot Berman 2023-02-28 0:52 ` Alex Elder 2023-02-28 0:52 ` Alex Elder 2023-02-28 22:49 ` Elliot Berman 2023-02-28 22:49 ` Elliot Berman 2023-02-23 23:28 ` Alex Elder 2023-02-23 23:28 ` Alex Elder 2023-02-24 22:39 ` Elliot Berman 2023-02-24 22:39 ` Elliot Berman 2023-02-14 21:23 ` [PATCH v10 09/26] gunyah: rsc_mgr: Add VM lifecycle RPC Elliot Berman 2023-02-14 21:23 ` Elliot Berman 2023-02-16 6:39 ` Greg Kroah-Hartman 2023-02-16 6:39 ` Greg Kroah-Hartman 2023-02-16 17:18 ` Elliot Berman 2023-02-16 17:18 ` Elliot Berman 2023-02-21 7:50 ` Srinivas Kandagatla 2023-02-21 7:50 ` Srinivas Kandagatla 2023-02-23 21:36 ` Alex Elder 2023-02-23 21:36 ` Alex Elder 2023-02-23 23:10 ` Elliot Berman 2023-02-23 23:10 ` Elliot Berman 2023-02-14 21:23 ` [PATCH v10 10/26] gunyah: vm_mgr: Introduce basic VM Manager Elliot Berman 2023-02-14 21:23 ` Elliot Berman 2023-02-21 10:46 ` Srinivas Kandagatla 2023-02-21 10:46 ` Srinivas Kandagatla 2023-02-22 0:27 ` Elliot Berman 2023-02-22 0:27 ` Elliot Berman 2023-02-23 10:08 ` Srinivas Kandagatla 2023-02-23 10:08 ` Srinivas Kandagatla 2023-02-23 22:40 ` Elliot Berman 2023-02-23 22:40 ` Elliot Berman 2023-02-24 10:29 ` Srinivas Kandagatla 2023-02-24 10:29 ` Srinivas Kandagatla 2023-02-24 13:20 ` Arnd Bergmann 2023-02-24 13:20 ` Arnd Bergmann 2023-02-24 22:48 ` Elliot Berman 2023-02-24 22:48 ` Elliot Berman 2023-02-28 1:06 ` Alex Elder 2023-02-28 1:06 ` Alex Elder 2023-02-28 9:19 ` Arnd Bergmann 2023-02-28 9:19 ` Arnd Bergmann 2023-02-21 13:06 ` Srivatsa Vaddagiri 2023-02-21 13:06 ` Srivatsa Vaddagiri 2023-02-14 21:24 ` [PATCH v10 11/26] gunyah: rsc_mgr: Add RPC for sharing memory Elliot Berman 2023-02-14 21:24 ` Elliot Berman 2023-02-21 11:07 ` Srinivas Kandagatla 2023-02-21 11:07 ` Srinivas Kandagatla 2023-02-14 21:24 ` [PATCH v10 12/26] gunyah: vm_mgr: Add/remove user memory regions Elliot Berman 2023-02-14 21:24 ` Elliot Berman 2023-02-16 6:38 ` Greg Kroah-Hartman 2023-02-16 6:38 ` Greg Kroah-Hartman 2023-02-16 17:24 ` Elliot Berman 2023-02-16 17:24 ` Elliot Berman 2023-02-21 12:28 ` Srinivas Kandagatla 2023-02-21 12:28 ` Srinivas Kandagatla 2023-02-21 12:43 ` Srivatsa Vaddagiri 2023-02-21 12:43 ` Srivatsa Vaddagiri 2023-02-24 0:43 ` Elliot Berman 2023-02-24 0:43 ` Elliot Berman 2023-02-24 10:36 ` Srinivas Kandagatla 2023-02-24 10:36 ` Srinivas Kandagatla 2023-02-21 12:45 ` Srivatsa Vaddagiri 2023-02-21 12:45 ` Srivatsa Vaddagiri 2023-02-24 0:34 ` Alex Elder 2023-02-24 0:34 ` Alex Elder 2023-02-25 1:03 ` Elliot Berman 2023-02-25 1:03 ` Elliot Berman 2023-02-24 10:19 ` Fuad Tabba 2023-02-24 10:19 ` Fuad Tabba 2023-02-24 18:08 ` Elliot Berman 2023-02-24 18:08 ` Elliot Berman 2023-02-24 18:58 ` Sean Christopherson 2023-02-24 18:58 ` Sean Christopherson 2023-02-27 9:55 ` Fuad Tabba 2023-02-27 9:55 ` Fuad Tabba 2023-02-14 21:24 ` [PATCH v10 13/26] gunyah: vm_mgr: Add ioctls to support basic non-proxy VM boot Elliot Berman 2023-02-14 21:24 ` Elliot Berman 2023-02-16 6:35 ` Greg Kroah-Hartman 2023-02-16 6:35 ` Greg Kroah-Hartman 2023-02-16 17:20 ` Elliot Berman 2023-02-16 17:20 ` Elliot Berman 2023-02-20 9:15 ` Srivatsa Vaddagiri [this message] 2023-02-20 9:15 ` Srivatsa Vaddagiri 2023-02-20 9:54 ` Srivatsa Vaddagiri 2023-02-20 9:54 ` Srivatsa Vaddagiri 2023-02-21 13:06 ` Srivatsa Vaddagiri 2023-02-21 13:06 ` Srivatsa Vaddagiri 2023-02-21 14:17 ` Srinivas Kandagatla 2023-02-21 14:17 ` Srinivas Kandagatla 2023-02-23 0:50 ` Elliot Berman 2023-02-23 0:50 ` Elliot Berman 2023-02-23 9:21 ` Srinivas Kandagatla 2023-02-23 9:21 ` Srinivas Kandagatla 2023-02-14 21:24 ` [PATCH v10 14/26] samples: Add sample userspace Gunyah VM Manager Elliot Berman 2023-02-14 21:24 ` Elliot Berman 2023-02-14 21:24 ` [PATCH v10 15/26] gunyah: rsc_mgr: Add platform ops on mem_lend/mem_reclaim Elliot Berman 2023-02-14 21:24 ` Elliot Berman 2023-02-21 14:51 ` Srinivas Kandagatla 2023-02-21 14:51 ` Srinivas Kandagatla 2023-02-21 21:22 ` Elliot Berman 2023-02-21 21:22 ` Elliot Berman 2023-02-22 10:21 ` Srinivas Kandagatla 2023-02-22 10:21 ` Srinivas Kandagatla 2023-02-23 1:55 ` Elliot Berman 2023-02-23 1:55 ` Elliot Berman 2023-02-14 21:24 ` [PATCH v10 16/26] firmware: qcom_scm: Register Gunyah platform ops Elliot Berman 2023-02-14 21:24 ` Elliot Berman 2023-02-16 0:22 ` kernel test robot 2023-02-16 0:22 ` kernel test robot 2023-02-16 11:09 ` kernel test robot 2023-02-16 11:09 ` kernel test robot 2023-02-21 14:55 ` Srinivas Kandagatla 2023-02-21 14:55 ` Srinivas Kandagatla 2023-02-14 21:25 ` [PATCH v10 17/26] docs: gunyah: Document Gunyah VM Manager Elliot Berman 2023-02-14 21:25 ` Elliot Berman 2023-02-23 23:55 ` Alex Elder 2023-02-23 23:55 ` Alex Elder 2023-02-14 21:25 ` [PATCH v10 18/26] virt: gunyah: Translate gh_rm_hyp_resource into gunyah_resource Elliot Berman 2023-02-14 21:25 ` Elliot Berman 2023-02-21 17:47 ` Srinivas Kandagatla 2023-02-21 17:47 ` Srinivas Kandagatla 2023-02-14 21:25 ` [PATCH v10 19/26] gunyah: vm_mgr: Add framework to add VM Functions Elliot Berman 2023-02-14 21:25 ` Elliot Berman 2023-02-17 13:23 ` Srivatsa Vaddagiri 2023-02-17 13:23 ` Srivatsa Vaddagiri 2023-02-21 13:07 ` Srivatsa Vaddagiri 2023-02-21 13:07 ` Srivatsa Vaddagiri 2023-02-21 17:58 ` Srinivas Kandagatla 2023-02-21 17:58 ` Srinivas Kandagatla 2023-02-22 14:08 ` Srinivas Kandagatla 2023-02-22 14:08 ` Srinivas Kandagatla 2023-02-24 23:44 ` Elliot Berman 2023-02-24 23:44 ` Elliot Berman 2023-02-14 21:25 ` [PATCH v10 20/26] virt: gunyah: Add resource tickets Elliot Berman 2023-02-14 21:25 ` Elliot Berman 2023-02-14 21:25 ` [PATCH v10 21/26] virt: gunyah: Add IO handlers Elliot Berman 2023-02-14 21:25 ` Elliot Berman 2023-02-14 21:26 ` [PATCH v10 22/26] virt: gunyah: Add proxy-scheduled vCPUs Elliot Berman 2023-02-14 21:26 ` Elliot Berman 2023-02-14 21:26 ` [PATCH v10 23/26] virt: gunyah: Add hypercalls for sending doorbell Elliot Berman 2023-02-14 21:26 ` Elliot Berman 2023-02-14 21:26 ` [PATCH v10 24/26] virt: gunyah: Add irqfd interface Elliot Berman 2023-02-14 21:26 ` Elliot Berman 2023-02-14 21:26 ` [PATCH v10 25/26] virt: gunyah: Add ioeventfd Elliot Berman 2023-02-14 21:26 ` Elliot Berman 2023-02-14 21:26 ` [PATCH v10 26/26] MAINTAINERS: Add Gunyah hypervisor drivers section Elliot Berman 2023-02-14 21:26 ` Elliot Berman 2023-02-23 21:59 ` [PATCH v10 00/26] Drivers for Gunyah hypervisor Alex Elder 2023-02-23 21:59 ` Alex Elder
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