All,

After some looking here and there, I modified my code, but still no
success in mapping kernel wired memory to user vm space. I do not get
any error, but user process in "user mode" do not see, what I write at
allocated space.
If some one could point my mistakes, I shall be very greatful.
rgds,
- nalin

Steps at module load time and user process (open/ioctl) time are:

=========== At Module Load time ================
logPoolSize = (logPoolSize + PGOFSET) & ~PGOFSET;
 /* for char dev, this seems to be api, though not in man page */
 alfLogMgr.uvmObject   = udv_attach( &dev, VM_PROT_WRITE|VM_PROT_READ,
0, logPoolSize);
allocFlags = UVM_KMF_NOWAIT ;
alfLogMgr.wiredMemory = uvm_km_kmemalloc1(kernel_map, alfLogMgr.uvmObject,
                                                  logPoolSize, 1, 0,
allocFlags);
/* alfLogMgr.uvmObject is not kernel object, so we need to wire forcibly */
/* wire the pages */
TAILQ_FOREACH(pg, &alfLogMgr.uvmObject->memq, listq) {
        uvm_lock_pageq();
        uvm_pagewire(pg);
        uvm_unlock_pageq();
 }
 p = (void*)alfLogMgr.wiredMemory;
*p = 0x0a0b0c0d;         //  <<<   this I wish to see from user
process in user mode
=========== [snip] =============================
Here, if I dump using  uvm_object_printit and uvm_page_printit, I see:

OBJECT 0xc0b01800: locked=0, pgops=0xc03cffe8, npages=1, refs=1
  PAGES <pg,offset>:
  <0xc0816500,0x70ef000>

PAGE 0xc0816500:
  flags=4c<TABLED,CLEAN,FAKE>, pqflags=0, wire_count=1, pa=0x465f000
  uobject=0xc0b01800, uanon=0x0, offset=0x70ef000 loan_count=0
  [page ownership tracking disabled]
  checking object list
  page found on object list



=========== At User Process accessing module (open/ioctl) ================
uao_reference(alfLogMgr.uvmObject);
attach_va = 0;   // <<< this should have addr usable from user mode.
/* this should attach phy pages to user virtual addr */
error = uvm_map( &p->p_vmspace->vm_map,  &attach_va, logPoolSize,
                        alfLogMgr.uvmObject,  0, 0,
                        UVM_MAPFLAG(UVM_PROT_RW, UVM_PROT_RW,
UVM_INH_NONE, UVM_ADV_RANDOM, 0)
                      ) ;
=========== [snip] =============================
I dumped uvm_map_printit for userp process and could see uvm_object
as below:

MAP 0xc6fee294: [0x0->0xbfc00000]
        #ent=13, sz=34385920, ref=1, version=35, flags=0x1
        pmap=0xc6fef0e4(resident=111)
[...]
- 0xc702e68c: 0x1410f000->0x14110000: obj=0xc0b01800/0x0, amap=0x0/0
        submap=F, cow=F, nc=F, prot(max)=3/3, inh=2, wc=0, adv=1
[...]

---------------------------------------------------------------------------------------------
So when I pass attach_va value to user process in user mode, and
try to deference it as interger pointer, I read value: 0xf000ff7f