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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _X86_SGX_H
#define _X86_SGX_H
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/rwsem.h>
#include <linux/types.h>
#include <asm/asm.h>
#include <asm/sgx.h>
#undef pr_fmt
#define pr_fmt(fmt) "sgx: " fmt
#define EREMOVE_ERROR_MESSAGE \
"EREMOVE returned %d (0x%x) and an EPC page was leaked. SGX may become unusable. " \
"Refer to Documentation/x86/sgx.rst for more information."
#define SGX_MAX_EPC_SECTIONS 8
#define SGX_EEXTEND_BLOCK_SIZE 256
#define SGX_NR_TO_SCAN 16
#define SGX_NR_LOW_PAGES 32
#define SGX_NR_HIGH_PAGES 64
/* Pages, which are being tracked by the page reclaimer. */
#define SGX_EPC_PAGE_RECLAIMER_TRACKED BIT(0)
/* Pages on free list */
#define SGX_EPC_PAGE_IS_FREE BIT(1)
struct sgx_epc_page {
unsigned int section;
u16 flags;
u16 poison;
struct sgx_encl_page *owner;
struct list_head list;
};
/*
* Contains the tracking data for NUMA nodes having EPC pages. Most importantly,
* the free page list local to the node is stored here.
*/
struct sgx_numa_node {
struct list_head free_page_list;
struct list_head sgx_poison_page_list;
unsigned long size;
spinlock_t lock;
};
/*
* The firmware can define multiple chunks of EPC to the different areas of the
* physical memory e.g. for memory areas of the each node. This structure is
* used to store EPC pages for one EPC section and virtual memory area where
* the pages have been mapped.
*/
struct sgx_epc_section {
unsigned long phys_addr;
void *virt_addr;
struct sgx_epc_page *pages;
struct sgx_numa_node *node;
};
extern struct sgx_epc_section sgx_epc_sections[SGX_MAX_EPC_SECTIONS];
static inline unsigned long sgx_get_epc_phys_addr(struct sgx_epc_page *page)
{
struct sgx_epc_section *section = &sgx_epc_sections[page->section];
unsigned long index;
index = ((unsigned long)page - (unsigned long)section->pages) / sizeof(*page);
return section->phys_addr + index * PAGE_SIZE;
}
static inline void *sgx_get_epc_virt_addr(struct sgx_epc_page *page)
{
struct sgx_epc_section *section = &sgx_epc_sections[page->section];
unsigned long index;
index = ((unsigned long)page - (unsigned long)section->pages) / sizeof(*page);
return section->virt_addr + index * PAGE_SIZE;
}
struct sgx_epc_page *__sgx_alloc_epc_page(void);
void sgx_free_epc_page(struct sgx_epc_page *page);
void sgx_mark_page_reclaimable(struct sgx_epc_page *page);
int sgx_unmark_page_reclaimable(struct sgx_epc_page *page);
struct sgx_epc_page *sgx_alloc_epc_page(void *owner, bool reclaim);
#ifdef CONFIG_X86_SGX_KVM
int __init sgx_vepc_init(void);
#else
static inline int __init sgx_vepc_init(void)
{
return -ENODEV;
}
#endif
void sgx_update_lepubkeyhash(u64 *lepubkeyhash);
#endif /* _X86_SGX_H */
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