mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 13:13:57 +08:00
77bd2342d4
Add support for changing the memory encryption attribute for one or more memory pages. This will be useful when we have to change the AP trampoline area to not be encrypted. Or when we need to change the SWIOTLB area to not be encrypted in support of devices that can't support the encryption mask range. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@suse.de> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Dave Young <dyoung@redhat.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Larry Woodman <lwoodman@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Toshimitsu Kani <toshi.kani@hpe.com> Cc: kasan-dev@googlegroups.com Cc: kvm@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-doc@vger.kernel.org Cc: linux-efi@vger.kernel.org Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/924ae0d1f6d4c90c5a0e366c291b90a2d86aa79e.1500319216.git.thomas.lendacky@amd.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
91 lines
3.8 KiB
C
91 lines
3.8 KiB
C
#ifndef _ASM_X86_SET_MEMORY_H
|
|
#define _ASM_X86_SET_MEMORY_H
|
|
|
|
#include <asm/page.h>
|
|
#include <asm-generic/set_memory.h>
|
|
|
|
/*
|
|
* The set_memory_* API can be used to change various attributes of a virtual
|
|
* address range. The attributes include:
|
|
* Cachability : UnCached, WriteCombining, WriteThrough, WriteBack
|
|
* Executability : eXeutable, NoteXecutable
|
|
* Read/Write : ReadOnly, ReadWrite
|
|
* Presence : NotPresent
|
|
* Encryption : Encrypted, Decrypted
|
|
*
|
|
* Within a category, the attributes are mutually exclusive.
|
|
*
|
|
* The implementation of this API will take care of various aspects that
|
|
* are associated with changing such attributes, such as:
|
|
* - Flushing TLBs
|
|
* - Flushing CPU caches
|
|
* - Making sure aliases of the memory behind the mapping don't violate
|
|
* coherency rules as defined by the CPU in the system.
|
|
*
|
|
* What this API does not do:
|
|
* - Provide exclusion between various callers - including callers that
|
|
* operation on other mappings of the same physical page
|
|
* - Restore default attributes when a page is freed
|
|
* - Guarantee that mappings other than the requested one are
|
|
* in any state, other than that these do not violate rules for
|
|
* the CPU you have. Do not depend on any effects on other mappings,
|
|
* CPUs other than the one you have may have more relaxed rules.
|
|
* The caller is required to take care of these.
|
|
*/
|
|
|
|
int _set_memory_uc(unsigned long addr, int numpages);
|
|
int _set_memory_wc(unsigned long addr, int numpages);
|
|
int _set_memory_wt(unsigned long addr, int numpages);
|
|
int _set_memory_wb(unsigned long addr, int numpages);
|
|
int set_memory_uc(unsigned long addr, int numpages);
|
|
int set_memory_wc(unsigned long addr, int numpages);
|
|
int set_memory_wt(unsigned long addr, int numpages);
|
|
int set_memory_wb(unsigned long addr, int numpages);
|
|
int set_memory_np(unsigned long addr, int numpages);
|
|
int set_memory_4k(unsigned long addr, int numpages);
|
|
int set_memory_encrypted(unsigned long addr, int numpages);
|
|
int set_memory_decrypted(unsigned long addr, int numpages);
|
|
|
|
int set_memory_array_uc(unsigned long *addr, int addrinarray);
|
|
int set_memory_array_wc(unsigned long *addr, int addrinarray);
|
|
int set_memory_array_wt(unsigned long *addr, int addrinarray);
|
|
int set_memory_array_wb(unsigned long *addr, int addrinarray);
|
|
|
|
int set_pages_array_uc(struct page **pages, int addrinarray);
|
|
int set_pages_array_wc(struct page **pages, int addrinarray);
|
|
int set_pages_array_wt(struct page **pages, int addrinarray);
|
|
int set_pages_array_wb(struct page **pages, int addrinarray);
|
|
|
|
/*
|
|
* For legacy compatibility with the old APIs, a few functions
|
|
* are provided that work on a "struct page".
|
|
* These functions operate ONLY on the 1:1 kernel mapping of the
|
|
* memory that the struct page represents, and internally just
|
|
* call the set_memory_* function. See the description of the
|
|
* set_memory_* function for more details on conventions.
|
|
*
|
|
* These APIs should be considered *deprecated* and are likely going to
|
|
* be removed in the future.
|
|
* The reason for this is the implicit operation on the 1:1 mapping only,
|
|
* making this not a generally useful API.
|
|
*
|
|
* Specifically, many users of the old APIs had a virtual address,
|
|
* called virt_to_page() or vmalloc_to_page() on that address to
|
|
* get a struct page* that the old API required.
|
|
* To convert these cases, use set_memory_*() on the original
|
|
* virtual address, do not use these functions.
|
|
*/
|
|
|
|
int set_pages_uc(struct page *page, int numpages);
|
|
int set_pages_wb(struct page *page, int numpages);
|
|
int set_pages_x(struct page *page, int numpages);
|
|
int set_pages_nx(struct page *page, int numpages);
|
|
int set_pages_ro(struct page *page, int numpages);
|
|
int set_pages_rw(struct page *page, int numpages);
|
|
|
|
extern int kernel_set_to_readonly;
|
|
void set_kernel_text_rw(void);
|
|
void set_kernel_text_ro(void);
|
|
|
|
#endif /* _ASM_X86_SET_MEMORY_H */
|