130 lines
3.5 KiB
C
130 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/**
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* Copyright(c) 2016-20 Intel Corporation.
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*
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* Contains the software defined data structures for enclaves.
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*/
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#ifndef _X86_ENCL_H
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#define _X86_ENCL_H
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#include <linux/cpumask.h>
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/mm_types.h>
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#include <linux/mmu_notifier.h>
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#include <linux/mutex.h>
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#include <linux/notifier.h>
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#include <linux/srcu.h>
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#include <linux/workqueue.h>
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#include <linux/xarray.h>
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#include "sgx.h"
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/* 'desc' bits holding the offset in the VA (version array) page. */
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#define SGX_ENCL_PAGE_VA_OFFSET_MASK GENMASK_ULL(11, 3)
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/* 'desc' bit marking that the page is being reclaimed. */
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#define SGX_ENCL_PAGE_BEING_RECLAIMED BIT(3)
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struct sgx_encl_page {
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unsigned long desc;
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unsigned long vm_max_prot_bits:8;
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enum sgx_page_type type:16;
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struct sgx_epc_page *epc_page;
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struct sgx_encl *encl;
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struct sgx_va_page *va_page;
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};
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enum sgx_encl_flags {
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SGX_ENCL_IOCTL = BIT(0),
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SGX_ENCL_DEBUG = BIT(1),
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SGX_ENCL_CREATED = BIT(2),
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SGX_ENCL_INITIALIZED = BIT(3),
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};
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struct sgx_encl_mm {
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struct sgx_encl *encl;
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struct mm_struct *mm;
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struct list_head list;
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struct mmu_notifier mmu_notifier;
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};
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struct sgx_encl {
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unsigned long base;
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unsigned long size;
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unsigned long flags;
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unsigned int page_cnt;
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unsigned int secs_child_cnt;
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struct mutex lock;
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struct xarray page_array;
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struct sgx_encl_page secs;
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unsigned long attributes;
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unsigned long attributes_mask;
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cpumask_t cpumask;
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struct file *backing;
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struct kref refcount;
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struct list_head va_pages;
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unsigned long mm_list_version;
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struct list_head mm_list;
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spinlock_t mm_lock;
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struct srcu_struct srcu;
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};
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#define SGX_VA_SLOT_COUNT 512
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struct sgx_va_page {
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struct sgx_epc_page *epc_page;
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DECLARE_BITMAP(slots, SGX_VA_SLOT_COUNT);
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struct list_head list;
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};
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struct sgx_backing {
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struct page *contents;
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struct page *pcmd;
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unsigned long pcmd_offset;
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};
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extern const struct vm_operations_struct sgx_vm_ops;
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static inline int sgx_encl_find(struct mm_struct *mm, unsigned long addr,
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struct vm_area_struct **vma)
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{
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struct vm_area_struct *result;
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result = vma_lookup(mm, addr);
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if (!result || result->vm_ops != &sgx_vm_ops)
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return -EINVAL;
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*vma = result;
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return 0;
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}
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int sgx_encl_may_map(struct sgx_encl *encl, unsigned long start,
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unsigned long end, unsigned long vm_flags);
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bool current_is_ksgxd(void);
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void sgx_encl_release(struct kref *ref);
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int sgx_encl_mm_add(struct sgx_encl *encl, struct mm_struct *mm);
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const cpumask_t *sgx_encl_cpumask(struct sgx_encl *encl);
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int sgx_encl_alloc_backing(struct sgx_encl *encl, unsigned long page_index,
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struct sgx_backing *backing);
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void sgx_encl_put_backing(struct sgx_backing *backing);
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int sgx_encl_test_and_clear_young(struct mm_struct *mm,
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struct sgx_encl_page *page);
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struct sgx_encl_page *sgx_encl_page_alloc(struct sgx_encl *encl,
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unsigned long offset,
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u64 secinfo_flags);
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void sgx_zap_enclave_ptes(struct sgx_encl *encl, unsigned long addr);
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struct sgx_epc_page *sgx_alloc_va_page(bool reclaim);
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unsigned int sgx_alloc_va_slot(struct sgx_va_page *va_page);
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void sgx_free_va_slot(struct sgx_va_page *va_page, unsigned int offset);
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bool sgx_va_page_full(struct sgx_va_page *va_page);
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void sgx_encl_free_epc_page(struct sgx_epc_page *page);
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struct sgx_encl_page *sgx_encl_load_page(struct sgx_encl *encl,
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unsigned long addr);
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struct sgx_va_page *sgx_encl_grow(struct sgx_encl *encl, bool reclaim);
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void sgx_encl_shrink(struct sgx_encl *encl, struct sgx_va_page *va_page);
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#endif /* _X86_ENCL_H */
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