1.1 --- a/tools/internal/dom0_defs.h	Mon Nov 03 10:25:35 2003 +0000
     1.2 +++ b/tools/internal/dom0_defs.h	Mon Nov 03 11:19:13 2003 +0000
     1.3 @@ -85,6 +85,8 @@ static inline int do_dom0_op(dom0_op_t *
     1.4      int ret = -1;
     1.5      privcmd_hypercall_t hypercall;
     1.6  
     1.7 +    op->interface_version = DOM0_INTERFACE_VERSION;
     1.8 +
     1.9      hypercall.op     = __HYPERVISOR_dom0_op;
    1.10      hypercall.arg[0] = (unsigned long)op;
    1.11  
    1.12 @@ -95,7 +97,12 @@ static inline int do_dom0_op(dom0_op_t *
    1.13      }
    1.14  
    1.15      if ( do_xen_hypercall(&hypercall) < 0 )
    1.16 +    {
    1.17 +        if ( errno == EINVAL )
    1.18 +            fprintf(stderr, "Dom0 operation failed -- need to"
    1.19 +                    " rebuild the user-space tool set?\n");
    1.20          goto out2;
    1.21 +    }
    1.22  
    1.23      ret = 0;
    1.24  

     2.1 --- a/xen/common/dom0_ops.c	Mon Nov 03 10:25:35 2003 +0000
     2.2 +++ b/xen/common/dom0_ops.c	Mon Nov 03 11:19:13 2003 +0000
     2.3 @@ -92,6 +92,9 @@ long do_dom0_op(dom0_op_t *u_dom0_op)
     2.4      if ( copy_from_user(&op, u_dom0_op, sizeof(op)) )
     2.5          return -EFAULT;
     2.6  
     2.7 +    if ( op.interface_version != DOM0_INTERFACE_VERSION )
     2.8 +        return -EINVAL;
     2.9 +
    2.10      switch ( op.cmd )
    2.11      {
    2.12  

     3.1 --- a/xen/include/hypervisor-ifs/dom0_ops.h	Mon Nov 03 10:25:35 2003 +0000
     3.2 +++ b/xen/include/hypervisor-ifs/dom0_ops.h	Mon Nov 03 11:19:13 2003 +0000
     3.3 @@ -12,6 +12,13 @@
     3.4  
     3.5  #include "hypervisor-if.h"
     3.6  
     3.7 +/*
     3.8 + * Make sure you increment the interface version whenever you modify this file!
     3.9 + * This makes sure that old versions of dom0 tools will stop working in a
    3.10 + * well-defined way (rather than crashing the machine, for instance).
    3.11 + */
    3.12 +#define DOM0_INTERFACE_VERSION   0xAAAA0001
    3.13 +
    3.14  
    3.15  /*
    3.16   * The following is all CPU context. Note that the i387_ctxt block is filled 
    3.17 @@ -178,6 +185,7 @@ typedef struct dom0_settime_st
    3.18  typedef struct dom0_op_st
    3.19  {
    3.20      unsigned long cmd;
    3.21 +    unsigned long interface_version; /* DOM0_INTERFACE_VERSION */
    3.22      union
    3.23      {
    3.24          dom0_createdomain_t     createdomain;

     4.1 --- a/xenolinux-2.4.22-sparse/include/asm-xeno/hypervisor.h	Mon Nov 03 10:25:35 2003 +0000
     4.2 +++ b/xenolinux-2.4.22-sparse/include/asm-xeno/hypervisor.h	Mon Nov 03 11:19:13 2003 +0000
     4.3 @@ -265,6 +265,7 @@ static inline int HYPERVISOR_exit(void)
     4.4  static inline int HYPERVISOR_dom0_op(void *dom0_op)
     4.5  {
     4.6      int ret;
     4.7 +    op->interface_version = DOM0_INTERFACE_VERSION;
     4.8      __asm__ __volatile__ (
     4.9          TRAP_INSTR
    4.10          : "=a" (ret) : "0" (__HYPERVISOR_dom0_op),