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From:   Andra Paraschiv <andraprs@amazon.com>
To:     <linux-kernel@vger.kernel.org>
CC:     Anthony Liguori <aliguori@amazon.com>,
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        Andra Paraschiv <andraprs@amazon.com>
Subject: [PATCH v3 03/18] nitro_enclaves: Define enclave info for internal bookkeeping
Date:   Tue, 26 May 2020 01:13:19 +0300
Message-ID: <20200525221334.62966-4-andraprs@amazon.com>
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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@amazon.com>
Signed-off-by: Andra Paraschiv <andraprs@amazon.com>
---
Changelog

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 | 109 ++++++++++++++++++++++
 1 file changed, 109 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..6f1db85fc741
--- /dev/null
+++ b/drivers/virt/nitro_enclaves/ne_misc_dev.h
@@ -0,0 +1,109 @@
+/* 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>
+
+/* Entry in vCPU IDs list. */
+struct ne_vcpu_id {
+	/* CPU id associated with a given slot, apic id on x86. */
+	u32 vcpu_id;
+
+	struct list_head vcpu_id_list_entry;
+};
+
+/* Entry in memory regions list. */
+struct ne_mem_region {
+	struct list_head mem_region_list_entry;
+
+	/* Number of pages that make up the memory region. */
+	unsigned long nr_pages;
+
+	/* Pages that make up the user space memory region. */
+	struct page **pages;
+};
+
+/* Per-enclave data used for enclave lifetime management. */
+struct ne_enclave {
+	/**
+	 * CPU pool with siblings of already allocated CPUs to an enclave.
+	 * This is used when a CPU pool is set, to be able to know the CPU
+	 * siblings for the hyperthreading (HT) setup.
+	 */
+	cpumask_var_t cpu_siblings;
+
+	struct list_head enclave_list_entry;
+
+	/* Mutex for accessing this internal state. */
+	struct mutex enclave_info_mutex;
+
+	/**
+	 * Wait queue used for out-of-band event notifications
+	 * triggered from the PCI device event handler to the enclave
+	 * process via the poll function.
+	 */
+	wait_queue_head_t eventq;
+
+	/* Variable used to determine if the out-of-band event was triggered. */
+	bool has_event;
+
+	/**
+	 * The maximum number of memory regions that can be handled by the
+	 * lower levels.
+	 */
+	u64 max_mem_regions;
+
+	/* Enclave memory regions list. */
+	struct list_head mem_regions_list;
+
+	/* Enclave process abstraction mm data struct. */
+	struct mm_struct *mm;
+
+	/* Number of memory regions associated with the enclave. */
+	u64 nr_mem_regions;
+
+	/* Number of vcpus associated with the enclave. */
+	u64 nr_vcpus;
+
+	/* PCI device used for enclave lifetime management. */
+	struct pci_dev *pdev;
+
+	/* Slot unique id mapped to the enclave. */
+	u64 slot_uid;
+
+	/* Enclave state, updated during enclave lifetime. */
+	u16 state;
+
+	/* Enclave vCPUs list. */
+	struct list_head vcpu_ids_list;
+};
+
+/* States available for an enclave. */
+enum ne_state {
+	/* NE_START_ENCLAVE ioctl was never issued for the enclave. */
+	NE_STATE_INIT = 0,
+
+	/**
+	 * NE_START_ENCLAVE ioctl was issued and the enclave is running
+	 * as expected.
+	 */
+	NE_STATE_RUNNING = 2,
+
+	/* Enclave exited without userspace interaction. */
+	NE_STATE_STOPPED = U16_MAX,
+};
+
+/* Nitro Enclaves (NE) misc device */
+extern struct miscdevice ne_miscdevice;
+
+#endif /* _NE_MISC_DEV_H_ */
-- 
2.20.1 (Apple Git-117)


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