Know if we are on a virtual machine thank's to the processor cache trick

is_vm.c

#include <stdio.h>

int main () {
    unsigned char m[2+4], rpill[] = "\x0f\x01\x0d\x00\x00\x00\x00\xc3";
    *((unsigned*) & rpill[3]) = (unsigned)m;
    ((void(*)()) & rpill)();
    printf ("idt base: %#x\n", *((unsigned*) & m[2]));
    
    if (m[5]>0xd0) {
        printf ("Inside Matrix!\n", m[5]);
        return 1;
    }
    else {
        printf ("Not in Matrix.\n");
        return 0;
    }
}