user/test/x86/hypercall.c

   1 #include "libcflat.h"
   2
   3 #define KVM_HYPERCALL_INTEL ".byte 0x0f,0x01,0xc1"
   4 #define KVM_HYPERCALL_AMD ".byte 0x0f,0x01,0xd9"
   5
   6 static inline long kvm_hypercall0_intel(unsigned int nr)
   7 {
   8         long ret;
   9         asm volatile(KVM_HYPERCALL_INTEL
  10                      : "=a"(ret)
  11                      : "a"(nr));
  12         return ret;
  13 }
  14
  15 static inline long kvm_hypercall0_amd(unsigned int nr)
  16 {
  17         long ret;
  18         asm volatile(KVM_HYPERCALL_AMD
  19                      : "=a"(ret)
  20                      : "a"(nr));
  21         return ret;
  22 }
  23
  24 int main(int ac, char **av)
  25 {
  26         kvm_hypercall0_intel(-1u);
  27         printf("Hypercall via VMCALL: OK\n");
  28         kvm_hypercall0_amd(-1u);
  29         printf("Hypercall via VMMCALL: OK\n");
  30         return 0;
  31 }