1 files changed, 129 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/sgx/encl.h b/arch/x86/kernel/cpu/sgx/encl.h
new file mode 100644
index 000000000..f94ff14c9
--- /dev/null
+++ b/arch/x86/kernel/cpu/sgx/encl.h
@@ -0,0 +1,129 @@
+/* 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:8;
+	enum sgx_page_type type:16;
+	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 {
+	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);
+
+bool current_is_ksgxd(void);
+void sgx_encl_release(struct kref *ref);
+int sgx_encl_mm_add(struct sgx_encl *encl, struct mm_struct *mm);
+const cpumask_t *sgx_encl_cpumask(struct sgx_encl *encl);
+int sgx_encl_alloc_backing(struct sgx_encl *encl, unsigned long page_index,
+			   struct sgx_backing *backing);
+void sgx_encl_put_backing(struct sgx_backing *backing);
+int sgx_encl_test_and_clear_young(struct mm_struct *mm,
+				  struct sgx_encl_page *page);
+struct sgx_encl_page *sgx_encl_page_alloc(struct sgx_encl *encl,
+					  unsigned long offset,
+					  u64 secinfo_flags);
+void sgx_zap_enclave_ptes(struct sgx_encl *encl, unsigned long addr);
+struct sgx_epc_page *sgx_alloc_va_page(bool reclaim);
+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);
+struct sgx_encl_page *sgx_encl_load_page(struct sgx_encl *encl,
+					 unsigned long addr);
+struct sgx_va_page *sgx_encl_grow(struct sgx_encl *encl, bool reclaim);
+void sgx_encl_shrink(struct sgx_encl *encl, struct sgx_va_page *va_page);
+
+#endif /* _X86_ENCL_H */