Hi ALL:
I am a novice,I have attempted to call hypercall from userspace.It's
failed.
My OS is Fedora 16(64bit) .
First,I have created a new hypercall.
*xen/include/public*
#define __HYPERVISOR_tmem_op 38
#define __HYPERVISOR_print_string 39/*new addition*/
*xen/arch/x86/x86_64*
ENTRY(hypercall_table)
…
.quad do_tmem_op
.quad do_print_string
…
ENTRY(hypercall_args_table)
.byte 1 /* do_tmem_op */
.byte 1 /* do_print_string */
*Xen/include/asm-x86/hypercall.h*
#ifdef __x86_64__
…
extern int
do_print_string(
char* message);
#else
*xen/arch/x86/mm.c*
int do_print_string(char *message)
{
#ifdef __x86_64__
if(message)
printk(“MESSAGE(x86_64:%s\n)”,message);
else
printk(“MESSAGE(x86_64):Nothing Output!”);
#endif
if(message)
Printk(“MESSAGE(x86_32:%s\n)”,message);
else
printk(“MESSAGE(x86_32):Nothing Output!”);
return 1;
}
hypercall.c
int main(int argc, char *argv[])
{
int fd, ret;
char * message;
if (argc != 2) {
printf("please put one parameter!/n");
return -1;
}
message = (char *) malloc(sizeof(char) * (strlen(argv[1])+1));
strcpy(message, argv[1]);
privcmd_hypercall_t hcall = {
__HYPERVISOR_print_string,
{message, 0, 0, 0, 0}
};
fd = open("/proc/xen/privcmd", O_RDWR);
if (fd < 0) {
perror("open");
exit(1);
} else
printf("fd = %d/n", fd);
ret = ioctl(fd, IOCTL_PRIVCMD_HYPERCALL, &hcall);
printf("ret = %d/n", ret);
}
When I executed ./a.out Hello_world,fd=3 and ret=-1.It's failed.Of course
the command xm dmesg printed nothing.Please tell me where is wrong.Thanks.
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