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138 lines
5.3 KiB
138 lines
5.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_SET_MEMORY_H |
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#define _ASM_X86_SET_MEMORY_H |
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#include <asm/page.h> |
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#include <asm-generic/set_memory.h> |
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/* |
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* The set_memory_* API can be used to change various attributes of a virtual |
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* address range. The attributes include: |
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* Cachability : UnCached, WriteCombining, WriteThrough, WriteBack |
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* Executability : eXeutable, NoteXecutable |
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* Read/Write : ReadOnly, ReadWrite |
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* Presence : NotPresent |
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* Encryption : Encrypted, Decrypted |
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* |
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* Within a category, the attributes are mutually exclusive. |
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* |
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* The implementation of this API will take care of various aspects that |
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* are associated with changing such attributes, such as: |
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* - Flushing TLBs |
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* - Flushing CPU caches |
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* - Making sure aliases of the memory behind the mapping don't violate |
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* coherency rules as defined by the CPU in the system. |
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* |
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* What this API does not do: |
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* - Provide exclusion between various callers - including callers that |
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* operation on other mappings of the same physical page |
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* - Restore default attributes when a page is freed |
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* - Guarantee that mappings other than the requested one are |
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* in any state, other than that these do not violate rules for |
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* the CPU you have. Do not depend on any effects on other mappings, |
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* CPUs other than the one you have may have more relaxed rules. |
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* The caller is required to take care of these. |
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*/ |
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int __set_memory_prot(unsigned long addr, int numpages, pgprot_t prot); |
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int _set_memory_uc(unsigned long addr, int numpages); |
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int _set_memory_wc(unsigned long addr, int numpages); |
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int _set_memory_wt(unsigned long addr, int numpages); |
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int _set_memory_wb(unsigned long addr, int numpages); |
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int set_memory_uc(unsigned long addr, int numpages); |
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int set_memory_wc(unsigned long addr, int numpages); |
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int set_memory_wb(unsigned long addr, int numpages); |
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int set_memory_np(unsigned long addr, int numpages); |
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int set_memory_4k(unsigned long addr, int numpages); |
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int set_memory_encrypted(unsigned long addr, int numpages); |
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int set_memory_decrypted(unsigned long addr, int numpages); |
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int set_memory_np_noalias(unsigned long addr, int numpages); |
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int set_memory_nonglobal(unsigned long addr, int numpages); |
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int set_memory_global(unsigned long addr, int numpages); |
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int set_pages_array_uc(struct page **pages, int addrinarray); |
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int set_pages_array_wc(struct page **pages, int addrinarray); |
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int set_pages_array_wt(struct page **pages, int addrinarray); |
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int set_pages_array_wb(struct page **pages, int addrinarray); |
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/* |
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* For legacy compatibility with the old APIs, a few functions |
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* are provided that work on a "struct page". |
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* These functions operate ONLY on the 1:1 kernel mapping of the |
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* memory that the struct page represents, and internally just |
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* call the set_memory_* function. See the description of the |
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* set_memory_* function for more details on conventions. |
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* |
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* These APIs should be considered *deprecated* and are likely going to |
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* be removed in the future. |
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* The reason for this is the implicit operation on the 1:1 mapping only, |
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* making this not a generally useful API. |
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* |
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* Specifically, many users of the old APIs had a virtual address, |
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* called virt_to_page() or vmalloc_to_page() on that address to |
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* get a struct page* that the old API required. |
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* To convert these cases, use set_memory_*() on the original |
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* virtual address, do not use these functions. |
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*/ |
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int set_pages_uc(struct page *page, int numpages); |
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int set_pages_wb(struct page *page, int numpages); |
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int set_pages_ro(struct page *page, int numpages); |
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int set_pages_rw(struct page *page, int numpages); |
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int set_direct_map_invalid_noflush(struct page *page); |
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int set_direct_map_default_noflush(struct page *page); |
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bool kernel_page_present(struct page *page); |
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extern int kernel_set_to_readonly; |
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#ifdef CONFIG_X86_64 |
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/* |
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* Prevent speculative access to the page by either unmapping |
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* it (if we do not require access to any part of the page) or |
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* marking it uncacheable (if we want to try to retrieve data |
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* from non-poisoned lines in the page). |
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*/ |
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static inline int set_mce_nospec(unsigned long pfn, bool unmap) |
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{ |
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unsigned long decoy_addr; |
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int rc; |
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/* |
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* We would like to just call: |
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* set_memory_XX((unsigned long)pfn_to_kaddr(pfn), 1); |
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* but doing that would radically increase the odds of a |
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* speculative access to the poison page because we'd have |
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* the virtual address of the kernel 1:1 mapping sitting |
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* around in registers. |
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* Instead we get tricky. We create a non-canonical address |
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* that looks just like the one we want, but has bit 63 flipped. |
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* This relies on set_memory_XX() properly sanitizing any __pa() |
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* results with __PHYSICAL_MASK or PTE_PFN_MASK. |
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*/ |
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decoy_addr = (pfn << PAGE_SHIFT) + (PAGE_OFFSET ^ BIT(63)); |
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if (unmap) |
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rc = set_memory_np(decoy_addr, 1); |
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else |
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rc = set_memory_uc(decoy_addr, 1); |
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if (rc) |
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pr_warn("Could not invalidate pfn=0x%lx from 1:1 map\n", pfn); |
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return rc; |
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} |
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#define set_mce_nospec set_mce_nospec |
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/* Restore full speculative operation to the pfn. */ |
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static inline int clear_mce_nospec(unsigned long pfn) |
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{ |
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return set_memory_wb((unsigned long) pfn_to_kaddr(pfn), 1); |
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} |
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#define clear_mce_nospec clear_mce_nospec |
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#else |
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/* |
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* Few people would run a 32-bit kernel on a machine that supports |
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* recoverable errors because they have too much memory to boot 32-bit. |
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*/ |
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#endif |
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#endif /* _ASM_X86_SET_MEMORY_H */
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