arch/x86/include/asm/invpcid.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_INVPCID
   3 #define _ASM_X86_INVPCID
   4
   5 static inline void __invpcid(unsigned long pcid, unsigned long addr,
   6                              unsigned long type)
   7 {
   8         struct { u64 d[2]; } desc = { { pcid, addr } };
   9
  10         /*
  11          * The memory clobber is because the whole point is to invalidate
  12          * stale TLB entries and, especially if we're flushing global
  13          * mappings, we don't want the compiler to reorder any subsequent
  14          * memory accesses before the TLB flush.
  15          *
  16          * The hex opcode is invpcid (%ecx), %eax in 32-bit mode and
  17          * invpcid (%rcx), %rax in long mode.
  18          */
  19         asm volatile (".byte 0x66, 0x0f, 0x38, 0x82, 0x01"
  20                       : : "m" (desc), "a" (type), "c" (&desc) : "memory");
  21 }
  22
  23 #define INVPCID_TYPE_INDIV_ADDR         0
  24 #define INVPCID_TYPE_SINGLE_CTXT        1
  25 #define INVPCID_TYPE_ALL_INCL_GLOBAL    2
  26 #define INVPCID_TYPE_ALL_NON_GLOBAL     3
  27
  28 /* Flush all mappings for a given pcid and addr, not including globals. */
  29 static inline void invpcid_flush_one(unsigned long pcid,
  30                                      unsigned long addr)
  31 {
  32         __invpcid(pcid, addr, INVPCID_TYPE_INDIV_ADDR);
  33 }
  34
  35 /* Flush all mappings for a given PCID, not including globals. */
  36 static inline void invpcid_flush_single_context(unsigned long pcid)
  37 {
  38         __invpcid(pcid, 0, INVPCID_TYPE_SINGLE_CTXT);
  39 }
  40
  41 /* Flush all mappings, including globals, for all PCIDs. */
  42 static inline void invpcid_flush_all(void)
  43 {
  44         __invpcid(0, 0, INVPCID_TYPE_ALL_INCL_GLOBAL);
  45 }
  46
  47 /* Flush all mappings for all PCIDs except globals. */
  48 static inline void invpcid_flush_all_nonglobals(void)
  49 {
  50         __invpcid(0, 0, INVPCID_TYPE_ALL_NON_GLOBAL);
  51 }
  52
  53 #endif /* _ASM_X86_INVPCID */