1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _X86_SGX_H 3 #define _X86_SGX_H 4 5 #include <linux/bitops.h> 6 #include <linux/err.h> 7 #include <linux/io.h> 8 #include <linux/rwsem.h> 9 #include <linux/types.h> 10 #include <asm/asm.h> 11 #include <asm/sgx.h> 12 13 #undef pr_fmt 14 #define pr_fmt(fmt) "sgx: " fmt 15 16 #define EREMOVE_ERROR_MESSAGE \ 17 "EREMOVE returned %d (0x%x) and an EPC page was leaked. SGX may become unusable. " \ 18 "Refer to Documentation/arch/x86/sgx.rst for more information." 19 20 #define SGX_MAX_EPC_SECTIONS 8 21 #define SGX_EEXTEND_BLOCK_SIZE 256 22 #define SGX_NR_TO_SCAN 16 23 #define SGX_NR_LOW_PAGES 32 24 #define SGX_NR_HIGH_PAGES 64 25 26 /* Pages, which are being tracked by the page reclaimer. */ 27 #define SGX_EPC_PAGE_RECLAIMER_TRACKED BIT(0) 28 29 /* Pages on free list */ 30 #define SGX_EPC_PAGE_IS_FREE BIT(1) 31 32 struct sgx_epc_page { 33 unsigned int section; 34 u16 flags; 35 u16 poison; 36 struct sgx_encl_page *owner; 37 struct list_head list; 38 }; 39 40 /* 41 * Contains the tracking data for NUMA nodes having EPC pages. Most importantly, 42 * the free page list local to the node is stored here. 43 */ 44 struct sgx_numa_node { 45 struct list_head free_page_list; 46 struct list_head sgx_poison_page_list; 47 unsigned long size; 48 spinlock_t lock; 49 }; 50 51 /* 52 * The firmware can define multiple chunks of EPC to the different areas of the 53 * physical memory e.g. for memory areas of the each node. This structure is 54 * used to store EPC pages for one EPC section and virtual memory area where 55 * the pages have been mapped. 56 */ 57 struct sgx_epc_section { 58 unsigned long phys_addr; 59 void *virt_addr; 60 struct sgx_epc_page *pages; 61 struct sgx_numa_node *node; 62 }; 63 64 extern struct sgx_epc_section sgx_epc_sections[SGX_MAX_EPC_SECTIONS]; 65 sgx_get_epc_phys_addr(struct sgx_epc_page * page)66static inline unsigned long sgx_get_epc_phys_addr(struct sgx_epc_page *page) 67 { 68 struct sgx_epc_section *section = &sgx_epc_sections[page->section]; 69 unsigned long index; 70 71 index = ((unsigned long)page - (unsigned long)section->pages) / sizeof(*page); 72 73 return section->phys_addr + index * PAGE_SIZE; 74 } 75 sgx_get_epc_virt_addr(struct sgx_epc_page * page)76static inline void *sgx_get_epc_virt_addr(struct sgx_epc_page *page) 77 { 78 struct sgx_epc_section *section = &sgx_epc_sections[page->section]; 79 unsigned long index; 80 81 index = ((unsigned long)page - (unsigned long)section->pages) / sizeof(*page); 82 83 return section->virt_addr + index * PAGE_SIZE; 84 } 85 86 struct sgx_epc_page *__sgx_alloc_epc_page(void); 87 void sgx_free_epc_page(struct sgx_epc_page *page); 88 89 void sgx_reclaim_direct(void); 90 void sgx_mark_page_reclaimable(struct sgx_epc_page *page); 91 int sgx_unmark_page_reclaimable(struct sgx_epc_page *page); 92 struct sgx_epc_page *sgx_alloc_epc_page(void *owner, bool reclaim); 93 94 void sgx_ipi_cb(void *info); 95 96 #ifdef CONFIG_X86_SGX_KVM 97 int __init sgx_vepc_init(void); 98 #else sgx_vepc_init(void)99static inline int __init sgx_vepc_init(void) 100 { 101 return -ENODEV; 102 } 103 #endif 104 105 void sgx_update_lepubkeyhash(u64 *lepubkeyhash); 106 107 #endif /* _X86_SGX_H */ 108