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authorAndra Paraschiv <andraprs@amazon.com>2020-09-21 15:17:21 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-09-22 13:58:41 +0200
commitbd47c995c0e4e7b5ea2b7074a92ca3ff95e25cd0 (patch)
treed6e8f912a9ae6d3bd9412af6e657f977980abc4a /drivers/virt
parente5d616d8bb50a1c1d01e9a89030a8bcb2107fd08 (diff)
nitro_enclaves: Init misc device providing the ioctl interface
The Nitro Enclaves driver provides an ioctl interface to the user space for enclave lifetime management e.g. enclave creation / termination and setting enclave resources such as memory and CPU. This ioctl interface is mapped to a Nitro Enclaves misc device. Changelog v9 -> v10 * Update commit message to include the changelog before the SoB tag(s). v8 -> v9 * Use the ne_devs data structure to get the refs for the NE misc device in the NE PCI device driver logic. v7 -> v8 * Add define for the CID of the primary / parent VM. * Update the NE PCI driver shutdown logic to include misc device deregister. v6 -> v7 * Set the NE PCI device the parent of the NE misc device to be able to use it in the ioctl logic. * Update the naming and add more comments to make more clear the logic of handling full CPU cores and dedicating them to the enclave. v5 -> v6 * Remove the ioctl to query API version. * Update documentation to kernel-doc format. v4 -> v5 * Update the size of the NE CPU pool string from 4096 to 512 chars. v3 -> v4 * Use dev_err instead of custom NE log pattern. * Remove the NE CPU pool init during kernel module loading, as the CPU pool is now setup at runtime, via a sysfs file for the kernel parameter. * Add minimum enclave memory size definition. v2 -> v3 * Remove the GPL additional wording as SPDX-License-Identifier is already in place. * Remove the WARN_ON calls. * Remove linux/bug and linux/kvm_host includes that are not needed. * Remove "ratelimited" from the logs that are not in the ioctl call paths. * Remove file ops that do nothing for now - open and release. v1 -> v2 * Add log pattern for NE. * Update goto labels to match their purpose. * Update ne_cpu_pool data structure to include the global mutex. * Update NE misc device mode to 0660. * Check if the CPU siblings are included in the NE CPU pool, as full CPU cores are given for the enclave(s). Reviewed-by: Alexander Graf <graf@amazon.com> Signed-off-by: Andra Paraschiv <andraprs@amazon.com> Link: https://lore.kernel.org/r/20200921121732.44291-8-andraprs@amazon.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/virt')
-rw-r--r--drivers/virt/nitro_enclaves/ne_misc_dev.c139
-rw-r--r--drivers/virt/nitro_enclaves/ne_pci_dev.c14
2 files changed, 153 insertions, 0 deletions
diff --git a/drivers/virt/nitro_enclaves/ne_misc_dev.c b/drivers/virt/nitro_enclaves/ne_misc_dev.c
new file mode 100644
index 000000000000..c06825070313
--- /dev/null
+++ b/drivers/virt/nitro_enclaves/ne_misc_dev.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ */
+
+/**
+ * DOC: Enclave lifetime management driver for Nitro Enclaves (NE).
+ * Nitro is a hypervisor that has been developed by Amazon.
+ */
+
+#include <linux/anon_inodes.h>
+#include <linux/capability.h>
+#include <linux/cpu.h>
+#include <linux/device.h>
+#include <linux/file.h>
+#include <linux/hugetlb.h>
+#include <linux/limits.h>
+#include <linux/list.h>
+#include <linux/miscdevice.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/nitro_enclaves.h>
+#include <linux/pci.h>
+#include <linux/poll.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <uapi/linux/vm_sockets.h>
+
+#include "ne_misc_dev.h"
+#include "ne_pci_dev.h"
+
+/**
+ * NE_CPUS_SIZE - Size for max 128 CPUs, for now, in a cpu-list string, comma
+ * separated. The NE CPU pool includes CPUs from a single NUMA
+ * node.
+ */
+#define NE_CPUS_SIZE (512)
+
+/**
+ * NE_EIF_LOAD_OFFSET - The offset where to copy the Enclave Image Format (EIF)
+ * image in enclave memory.
+ */
+#define NE_EIF_LOAD_OFFSET (8 * 1024UL * 1024UL)
+
+/**
+ * NE_MIN_ENCLAVE_MEM_SIZE - The minimum memory size an enclave can be launched
+ * with.
+ */
+#define NE_MIN_ENCLAVE_MEM_SIZE (64 * 1024UL * 1024UL)
+
+/**
+ * NE_MIN_MEM_REGION_SIZE - The minimum size of an enclave memory region.
+ */
+#define NE_MIN_MEM_REGION_SIZE (2 * 1024UL * 1024UL)
+
+/**
+ * NE_PARENT_VM_CID - The CID for the vsock device of the primary / parent VM.
+ */
+#define NE_PARENT_VM_CID (3)
+
+static const struct file_operations ne_fops = {
+ .owner = THIS_MODULE,
+ .llseek = noop_llseek,
+};
+
+static struct miscdevice ne_misc_dev = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "nitro_enclaves",
+ .fops = &ne_fops,
+ .mode = 0660,
+};
+
+struct ne_devs ne_devs = {
+ .ne_misc_dev = &ne_misc_dev,
+};
+
+/*
+ * TODO: Update logic to create new sysfs entries instead of using
+ * a kernel parameter e.g. if multiple sysfs files needed.
+ */
+static const struct kernel_param_ops ne_cpu_pool_ops = {
+ .get = param_get_string,
+};
+
+static char ne_cpus[NE_CPUS_SIZE];
+static struct kparam_string ne_cpus_arg = {
+ .maxlen = sizeof(ne_cpus),
+ .string = ne_cpus,
+};
+
+module_param_cb(ne_cpus, &ne_cpu_pool_ops, &ne_cpus_arg, 0644);
+/* https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html#cpu-lists */
+MODULE_PARM_DESC(ne_cpus, "<cpu-list> - CPU pool used for Nitro Enclaves");
+
+/**
+ * struct ne_cpu_pool - CPU pool used for Nitro Enclaves.
+ * @avail_threads_per_core: Available full CPU cores to be dedicated to
+ * enclave(s). The cpumasks from the array, indexed
+ * by core id, contain all the threads from the
+ * available cores, that are not set for created
+ * enclave(s). The full CPU cores are part of the
+ * NE CPU pool.
+ * @mutex: Mutex for the access to the NE CPU pool.
+ * @nr_parent_vm_cores : The size of the available threads per core array.
+ * The total number of CPU cores available on the
+ * primary / parent VM.
+ * @nr_threads_per_core: The number of threads that a full CPU core has.
+ * @numa_node: NUMA node of the CPUs in the pool.
+ */
+struct ne_cpu_pool {
+ cpumask_var_t *avail_threads_per_core;
+ struct mutex mutex;
+ unsigned int nr_parent_vm_cores;
+ unsigned int nr_threads_per_core;
+ int numa_node;
+};
+
+static struct ne_cpu_pool ne_cpu_pool;
+
+static int __init ne_init(void)
+{
+ mutex_init(&ne_cpu_pool.mutex);
+
+ return pci_register_driver(&ne_pci_driver);
+}
+
+static void __exit ne_exit(void)
+{
+ pci_unregister_driver(&ne_pci_driver);
+}
+
+module_init(ne_init);
+module_exit(ne_exit);
+
+MODULE_AUTHOR("Amazon.com, Inc. or its affiliates");
+MODULE_DESCRIPTION("Nitro Enclaves Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/virt/nitro_enclaves/ne_pci_dev.c b/drivers/virt/nitro_enclaves/ne_pci_dev.c
index 6654cc8a1bc3..b9c1de41e300 100644
--- a/drivers/virt/nitro_enclaves/ne_pci_dev.c
+++ b/drivers/virt/nitro_enclaves/ne_pci_dev.c
@@ -523,8 +523,18 @@ static int ne_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
ne_devs.ne_pci_dev = ne_pci_dev;
+ rc = misc_register(ne_devs.ne_misc_dev);
+ if (rc < 0) {
+ dev_err(&pdev->dev, "Error in misc dev register [rc=%d]\n", rc);
+
+ goto disable_ne_pci_dev;
+ }
+
return 0;
+disable_ne_pci_dev:
+ ne_devs.ne_pci_dev = NULL;
+ ne_pci_dev_disable(pdev);
teardown_msix:
ne_teardown_msix(pdev);
iounmap_pci_bar:
@@ -550,6 +560,8 @@ static void ne_pci_remove(struct pci_dev *pdev)
{
struct ne_pci_dev *ne_pci_dev = pci_get_drvdata(pdev);
+ misc_deregister(ne_devs.ne_misc_dev);
+
ne_devs.ne_pci_dev = NULL;
ne_pci_dev_disable(pdev);
@@ -580,6 +592,8 @@ static void ne_pci_shutdown(struct pci_dev *pdev)
if (!ne_pci_dev)
return;
+ misc_deregister(ne_devs.ne_misc_dev);
+
ne_devs.ne_pci_dev = NULL;
ne_pci_dev_disable(pdev);