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_cpu_ops, iret, "iretq");
  10 DEF_NATIVE(pv_mmu_ops, read_cr2, "movq %cr2, %rax");
  11 DEF_NATIVE(pv_mmu_ops, read_cr3, "movq %cr3, %rax");
  12 DEF_NATIVE(pv_mmu_ops, write_cr3, "movq %rdi, %cr3");
  13 DEF_NATIVE(pv_mmu_ops, flush_tlb_single, "invlpg (%rdi)");
  14 DEF_NATIVE(pv_cpu_ops, clts, "clts");
  15 DEF_NATIVE(pv_cpu_ops, wbinvd, "wbinvd");
  16
  17 /* the three commands give us more control to how to return from a syscall */
  18 DEF_NATIVE(pv_cpu_ops, irq_enable_syscall_ret, "movq %gs:" __stringify(pda_oldrsp) ", %rsp; swapgs; sysretq;");
  19 DEF_NATIVE(pv_cpu_ops, swapgs, "swapgs");
  20
  21 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
  22                       unsigned long addr, unsigned len)
  23 {
  24         const unsigned char *start, *end;
  25         unsigned ret;
  26
  27 #define PATCH_SITE(ops, x)                                      \
  28                 case PARAVIRT_PATCH(ops.x):                     \
  29                         start = start_##ops##_##x;              \
  30                         end = end_##ops##_##x;                  \
  31                         goto patch_site
  32         switch(type) {
  33                 PATCH_SITE(pv_irq_ops, restore_fl);
  34                 PATCH_SITE(pv_irq_ops, save_fl);
  35                 PATCH_SITE(pv_irq_ops, irq_enable);
  36                 PATCH_SITE(pv_irq_ops, irq_disable);
  37                 PATCH_SITE(pv_cpu_ops, iret);
  38                 PATCH_SITE(pv_cpu_ops, irq_enable_syscall_ret);
  39                 PATCH_SITE(pv_cpu_ops, swapgs);
  40                 PATCH_SITE(pv_mmu_ops, read_cr2);
  41                 PATCH_SITE(pv_mmu_ops, read_cr3);
  42                 PATCH_SITE(pv_mmu_ops, write_cr3);
  43                 PATCH_SITE(pv_cpu_ops, clts);
  44                 PATCH_SITE(pv_mmu_ops, flush_tlb_single);
  45                 PATCH_SITE(pv_cpu_ops, wbinvd);
  46
  47         patch_site:
  48                 ret = paravirt_patch_insns(ibuf, len, start, end);
  49                 break;
  50
  51         default:
  52                 ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
  53                 break;
  54         }
  55 #undef PATCH_SITE
  56         return ret;
  57 }