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_cpu_ops, clts, "clts");
  13 DEF_NATIVE(pv_cpu_ops, wbinvd, "wbinvd");
  14
  15 DEF_NATIVE(pv_cpu_ops, irq_enable_sysexit, "swapgs; sti; sysexit");
  16 DEF_NATIVE(pv_cpu_ops, usergs_sysret64, "swapgs; sysretq");
  17 DEF_NATIVE(pv_cpu_ops, usergs_sysret32, "swapgs; sysretl");
  18 DEF_NATIVE(pv_cpu_ops, swapgs, "swapgs");
  19
  20 DEF_NATIVE(, mov32, "mov %edi, %eax");
  21 DEF_NATIVE(, mov64, "mov %rdi, %rax");
  22
  23 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
  24 {
  25         return paravirt_patch_insns(insnbuf, len,
  26                                     start__mov32, end__mov32);
  27 }
  28
  29 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
  30 {
  31         return paravirt_patch_insns(insnbuf, len,
  32                                     start__mov64, end__mov64);
  33 }
  34
  35 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
  36                       unsigned long addr, unsigned len)
  37 {
  38         const unsigned char *start, *end;
  39         unsigned ret;
  40
  41 #define PATCH_SITE(ops, x)                                      \
  42                 case PARAVIRT_PATCH(ops.x):                     \
  43                         start = start_##ops##_##x;              \
  44                         end = end_##ops##_##x;                  \
  45                         goto patch_site
  46         switch(type) {
  47                 PATCH_SITE(pv_irq_ops, restore_fl);
  48                 PATCH_SITE(pv_irq_ops, save_fl);
  49                 PATCH_SITE(pv_irq_ops, irq_enable);
  50                 PATCH_SITE(pv_irq_ops, irq_disable);
  51                 PATCH_SITE(pv_cpu_ops, irq_enable_sysexit);
  52                 PATCH_SITE(pv_cpu_ops, usergs_sysret32);
  53                 PATCH_SITE(pv_cpu_ops, usergs_sysret64);
  54                 PATCH_SITE(pv_cpu_ops, swapgs);
  55                 PATCH_SITE(pv_mmu_ops, read_cr2);
  56                 PATCH_SITE(pv_mmu_ops, read_cr3);
  57                 PATCH_SITE(pv_mmu_ops, write_cr3);
  58                 PATCH_SITE(pv_cpu_ops, clts);
  59                 PATCH_SITE(pv_cpu_ops, wbinvd);
  60
  61         patch_site:
  62                 ret = paravirt_patch_insns(ibuf, len, start, end);
  63                 break;
  64
  65         default:
  66                 ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
  67                 break;
  68         }
  69 #undef PATCH_SITE
  70         return ret;
  71 }