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