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