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 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
  25 {
  26         return paravirt_patch_insns(insnbuf, len,
  27                                     start__mov32, end__mov32);
  28 }
  29
  30 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
  31 {
  32         return paravirt_patch_insns(insnbuf, len,
  33                                     start__mov64, end__mov64);
  34 }
  35
  36 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
  37                       unsigned long addr, unsigned len)
  38 {
  39         const unsigned char *start, *end;
  40         unsigned ret;
  41
  42 #define PATCH_SITE(ops, x)                                      \
  43                 case PARAVIRT_PATCH(ops.x):                     \
  44                         start = start_##ops##_##x;              \
  45                         end = end_##ops##_##x;                  \
  46                         goto patch_site
  47         switch(type) {
  48                 PATCH_SITE(pv_irq_ops, restore_fl);
  49                 PATCH_SITE(pv_irq_ops, save_fl);
  50                 PATCH_SITE(pv_irq_ops, irq_enable);
  51                 PATCH_SITE(pv_irq_ops, irq_disable);
  52                 PATCH_SITE(pv_cpu_ops, irq_enable_sysexit);
  53                 PATCH_SITE(pv_cpu_ops, usergs_sysret32);
  54                 PATCH_SITE(pv_cpu_ops, usergs_sysret64);
  55                 PATCH_SITE(pv_cpu_ops, swapgs);
  56                 PATCH_SITE(pv_mmu_ops, read_cr2);
  57                 PATCH_SITE(pv_mmu_ops, read_cr3);
  58                 PATCH_SITE(pv_mmu_ops, write_cr3);
  59                 PATCH_SITE(pv_cpu_ops, clts);
  60                 PATCH_SITE(pv_mmu_ops, flush_tlb_single);
  61                 PATCH_SITE(pv_cpu_ops, wbinvd);
  62
  63         patch_site:
  64                 ret = paravirt_patch_insns(ibuf, len, start, end);
  65                 break;
  66
  67         default:
  68                 ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
  69                 break;
  70         }
  71 #undef PATCH_SITE
  72         return ret;
  73 }