kernel/arch/x86/kernel/paravirt_patch_64.c

   1 #include <asm/paravirt.h>
   2 #include <asm/asm-offsets.h>
   3 #include <linux/stringify.h>
   4
   5 DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
   6 DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
   7 DEF_NATIVE(pv_irq_ops, restore_fl, "pushq %rdi; popfq");
   8 DEF_NATIVE(pv_irq_ops, save_fl, "pushfq; popq %rax");
   9 DEF_NATIVE(pv_mmu_ops, read_cr2, "movq %cr2, %rax");
  10 DEF_NATIVE(pv_mmu_ops, read_cr3, "movq %cr3, %rax");
  11 DEF_NATIVE(pv_mmu_ops, write_cr3, "movq %rdi, %cr3");
  12 DEF_NATIVE(pv_mmu_ops, flush_tlb_single, "invlpg (%rdi)");
  13 DEF_NATIVE(pv_cpu_ops, clts, "clts");
  14 DEF_NATIVE(pv_cpu_ops, wbinvd, "wbinvd");
  15
  16 DEF_NATIVE(pv_cpu_ops, irq_enable_sysexit, "swapgs; sti; sysexit");
  17 DEF_NATIVE(pv_cpu_ops, usergs_sysret64, "swapgs; sysretq");
  18 DEF_NATIVE(pv_cpu_ops, usergs_sysret32, "swapgs; sysretl");
  19 DEF_NATIVE(pv_cpu_ops, swapgs, "swapgs");
  20
  21 DEF_NATIVE(, mov32, "mov %edi, %eax");
  22 DEF_NATIVE(, mov64, "mov %rdi, %rax");
  23
  24 #if defined(CONFIG_PARAVIRT_SPINLOCKS) && defined(CONFIG_QUEUED_SPINLOCKS)
  25 DEF_NATIVE(pv_lock_ops, queued_spin_unlock, "movb $0, (%rdi)");
  26 #endif
  27
  28 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
  29 {
  30         return paravirt_patch_insns(insnbuf, len,
  31                                     start__mov32, end__mov32);
  32 }
  33
  34 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
  35 {
  36         return paravirt_patch_insns(insnbuf, len,
  37                                     start__mov64, end__mov64);
  38 }
  39
  40 extern bool pv_is_native_spin_unlock(void);
  41
  42 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
  43                       unsigned long addr, unsigned len)
  44 {
  45         const unsigned char *start, *end;
  46         unsigned ret;
  47
  48 #define PATCH_SITE(ops, x)                                      \
  49                 case PARAVIRT_PATCH(ops.x):                     \
  50                         start = start_##ops##_##x;              \
  51                         end = end_##ops##_##x;                  \
  52                         goto patch_site
  53         switch(type) {
  54                 PATCH_SITE(pv_irq_ops, restore_fl);
  55                 PATCH_SITE(pv_irq_ops, save_fl);
  56                 PATCH_SITE(pv_irq_ops, irq_enable);
  57                 PATCH_SITE(pv_irq_ops, irq_disable);
  58                 PATCH_SITE(pv_cpu_ops, usergs_sysret32);
  59                 PATCH_SITE(pv_cpu_ops, usergs_sysret64);
  60                 PATCH_SITE(pv_cpu_ops, swapgs);
  61                 PATCH_SITE(pv_mmu_ops, read_cr2);
  62                 PATCH_SITE(pv_mmu_ops, read_cr3);
  63                 PATCH_SITE(pv_mmu_ops, write_cr3);
  64                 PATCH_SITE(pv_cpu_ops, clts);
  65                 PATCH_SITE(pv_mmu_ops, flush_tlb_single);
  66                 PATCH_SITE(pv_cpu_ops, wbinvd);
  67 #if defined(CONFIG_PARAVIRT_SPINLOCKS) && defined(CONFIG_QUEUED_SPINLOCKS)
  68                 case PARAVIRT_PATCH(pv_lock_ops.queued_spin_unlock):
  69                         if (pv_is_native_spin_unlock()) {
  70                                 start = start_pv_lock_ops_queued_spin_unlock;
  71                                 end   = end_pv_lock_ops_queued_spin_unlock;
  72                                 goto patch_site;
  73                         }
  74 #endif
  75
  76         default:
  77                 ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
  78                 break;
  79
  80 patch_site:
  81                 ret = paravirt_patch_insns(ibuf, len, start, end);
  82                 break;
  83         }
  84 #undef PATCH_SITE
  85         return ret;
  86 }