illumos gate

As part of the work required to add this new mdb dcmd, a new mdb walker was added to mdb API.
The reason behind this change is that the current local mdb walker has a fixed set of flags and this new dcmd
needed a way to signal if the current invocation needed to be PIPED_OUT.

To accomplish that, a new local walker was created mdb_fpwalk_dcmd that has the same functionality as mdb_pwalk_dcmd.
The difference is that this new walker has a flags argument, so a consumer could specify other required flags by their dcmds.

int mdb_fpwalk_dcmd(const char *wname, const char *dcname, it argc, const mdb_arg_t *argv, uintptr_t addr, uint_t flags );

Testing notes:

- Help

> ::help vmm

NAME
  vmm - print virtual machine information

SYNOPSIS
  [ addr ] ::vmm [-n vmname]

DESCRIPTION
  Prints summary information about vmm instances.

  The resulting output is a table of bhyve virtual machines on the system.
  The columns in the output are:

  SOFTC         Soft state, pointer to vmm_softc_t
  VM            state, pointer to 'struct vm'
  TOPO          topology as sockets/cores/threads
  MiB           allocated memory
  F             Flags   G - VMM is created in the global zone.
                        T - VMM is using transient memory.
                        R - VMM is using memory from reservoir.
                        D - VMM is set to auto-destruct.
  NAME          The virtual machine name.
  ZONE          The zone_t pointer to zone where the vm is running.

OPTIONS
  -n <name>     Only show the virtual machine called <name>

NOTES
  The MiB column sums up all memory segments and includes any
  memory allocated for the bootrom or framebuffer.

  Passing the output of this command into a pipeline results in
  the address of the vmm_softc_t in '.'

ATTRIBUTES

  Target: kvm
  Module: vmm
  Interface Stability: Unstable

>

 

- Single invocation :

> ::vmm
           SOFTC               VM             ZONE  TOPO MiB    F   NAME    
fffffe0ac1542040 fffffe0ada88d000 fffffe0adadb8a80 4/1/1 1041    T  test2  

- PIPE_OUT :

> ::vmm  | ::print vmm_softc_t vmm_name
vmm_name = [ "test2" ]

- Walker

> ::walk vmm | ::print vmm_softc_t vmm_kstat_vm
vmm_kstat_vm = 0xfffffe0ac9f47660

- Running vms in the global zone

 > ::vmm
           SOFTC               VM             ZONE  TOPO MiB    F   NAME
fffffe0aca3d5880 fffffe0abb53a000 fffffffffbd16980 4/1/1 1024   GT  vm
fffffe0aca7ed300 fffffe0abe92c000 fffffffffbd16980 4/1/1 1024   GT  vm1
fffffe0ab5d44880 fffffe0ab6597000 fffffffffbd16980 4/1/1 1025   GT  test2
fffffe0ac995cd40 fffffe0abaef3000 fffffffffbd16980 4/1/1 1040   GT  vm2
> fffffffffbd16980::print zone_t zone_name
zone_name = 0xfffffffffbb53c9b "global"