[PATCH v7 03/18] nitro_enclaves: Define enclave info for internal bookkeeping

[Andra Paraschiv]

The Nitro Enclaves driver keeps an internal info per each enclave.

This is needed to be able to manage enclave resources state, enclave
notifications and have a reference of the PCI device that handles
command requests for enclave lifetime management.

Signed-off-by: Alexandru-Catalin Vasile <lexnv@xxxxxxxxxx>
Signed-off-by: Andra Paraschiv <andraprs@xxxxxxxxxx>
Reviewed-by: Alexander Graf <graf@xxxxxxxxxx>
---
Changelog

v6 -> v7

* 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

* Update documentation to kernel-doc format.
* Include in the enclave memory region data structure the user space
  address and size for duplicate user space memory regions checks.

v4 -> v5

* Include enclave cores field in the enclave metadata.
* Update the vCPU ids data structure to be a cpumask instead of a list.

v3 -> v4

* Add NUMA node field for an enclave metadata as the enclave memory and
  CPUs need to be from the same NUMA node.

v2 -> v3

* Remove the GPL additional wording as SPDX-License-Identifier is
  already in place.

v1 -> v2

* Add enclave memory regions and vcpus count for enclave bookkeeping.
* Update ne_state comments to reflect NE_START_ENCLAVE ioctl naming
  update.
---
 drivers/virt/nitro_enclaves/ne_misc_dev.h | 99 +++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 drivers/virt/nitro_enclaves/ne_misc_dev.h

diff --git a/drivers/virt/nitro_enclaves/ne_misc_dev.h b/drivers/virt/nitro_enclaves/ne_misc_dev.h
new file mode 100644
index 000000000000..a907924de7ca
--- /dev/null
+++ b/drivers/virt/nitro_enclaves/ne_misc_dev.h
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ */
+
+#ifndef _NE_MISC_DEV_H_
+#define _NE_MISC_DEV_H_
+
+#include <linux/cpumask.h>
+#include <linux/list.h>
+#include <linux/miscdevice.h>
+#include <linux/mm.h>
+#include <linux/mutex.h>
+#include <linux/pci.h>
+#include <linux/wait.h>
+
+/**
+ * struct ne_mem_region - Entry in the enclave user space memory regions list.
+ * @mem_region_list_entry:	Entry in the list of enclave memory regions.
+ * @memory_size:		Size of the user space memory region.
+ * @nr_pages:			Number of pages that make up the memory region.
+ * @pages:			Pages that make up the user space memory region.
+ * @userspace_addr:		User space address of the memory region.
+ */
+struct ne_mem_region {
+	struct list_head	mem_region_list_entry;
+	u64			memory_size;
+	unsigned long		nr_pages;
+	struct page		**pages;
+	u64			userspace_addr;
+};
+
+/**
+ * struct ne_enclave - Per-enclave data used for enclave lifetime management.
+ * @enclave_info_mutex :	Mutex for accessing this internal state.
+ * @enclave_list_entry :	Entry in the list of created enclaves.
+ * @eventq:			Wait queue used for out-of-band event notifications
+ *				triggered from the PCI device event handler to
+ *				the enclave process via the poll function.
+ * @has_event:			Variable used to determine if the out-of-band event
+ *				was triggered.
+ * @max_mem_regions:		The maximum number of memory regions that can be
+ *				handled by the hypervisor.
+ * @mem_regions_list:		Enclave user space memory regions list.
+ * @mem_size:			Enclave memory size.
+ * @mm :			Enclave process abstraction mm data struct.
+ * @nr_mem_regions:		Number of memory regions associated with the enclave.
+ * @nr_parent_vm_cores :	The size of the threads per core array. The
+ *				total number of CPU cores available on the
+ *				parent / primary VM.
+ * @nr_threads_per_core:	The number of threads that a full CPU core has.
+ * @nr_vcpus:			Number of vcpus associated with the enclave.
+ * @numa_node:			NUMA node of the enclave memory and CPUs.
+ * @pdev:			PCI device used for enclave lifetime management.
+ * @slot_uid:			Slot unique id mapped to the enclave.
+ * @state:			Enclave state, updated during enclave lifetime.
+ * @threads_per_core:		Enclave full CPU cores array, indexed by core id,
+ *				consisting of cpumasks with all their threads.
+ *				Full CPU cores are taken from the NE CPU pool
+ *				and are available to the enclave.
+ * @vcpu_ids:			Cpumask of the vCPUs that are set for the enclave.
+ */
+struct ne_enclave {
+	struct mutex		enclave_info_mutex;
+	struct list_head	enclave_list_entry;
+	wait_queue_head_t	eventq;
+	bool			has_event;
+	u64			max_mem_regions;
+	struct list_head	mem_regions_list;
+	u64			mem_size;
+	struct mm_struct	*mm;
+	unsigned int		nr_mem_regions;
+	unsigned int		nr_parent_vm_cores;
+	unsigned int		nr_threads_per_core;
+	unsigned int		nr_vcpus;
+	int			numa_node;
+	struct pci_dev		*pdev;
+	u64			slot_uid;
+	u16			state;
+	cpumask_var_t		*threads_per_core;
+	cpumask_var_t		vcpu_ids;
+};
+
+/**
+ * enum ne_state - States available for an enclave.
+ * @NE_STATE_INIT:	The enclave has not been started yet.
+ * @NE_STATE_RUNNING:	The enclave was started and is running as expected.
+ * @NE_STATE_STOPPED:	The enclave exited without userspace interaction.
+ */
+enum ne_state {
+	NE_STATE_INIT		= 0,
+	NE_STATE_RUNNING	= 2,
+	NE_STATE_STOPPED	= U16_MAX,
+};
+
+/* Nitro Enclaves (NE) misc device */
+extern struct miscdevice ne_misc_dev;
+
+#endif /* _NE_MISC_DEV_H_ */
-- 
2.20.1 (Apple Git-117)




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