[Qemu-ppc] [PATCH -V3 0/4] target-ppc: Add support for dumping guest memory using qemu gdb server

[Aneesh Kumar K.V]

This patch series implement support for dumping guest memory using qemu gdb 
server.

With this patch series we can now do

(gdb) x/4i htab_call_hpte_insert1
   0xc0000000000470d8 <.htab_call_hpte_insert1>:        bl      
0xc0000000000470d8 <.htab_call_hpte_insert1>
   0xc0000000000470dc <.htab_call_hpte_insert1+4>:      cmpdi   r3,0
   0xc0000000000470e0 <.htab_call_hpte_insert1+8>:      bge     
0xc000000000047190 <htab_pte_insert_ok>
   0xc0000000000470e4 <.htab_call_hpte_insert1+12>:     cmpdi   r3,-2
(gdb) target remote localhost:1234
Remote debugging using localhost:1234
.plpar_hcall_norets () at arch/powerpc/platforms/pseries/hvCall.S:119
119             HCALL_INST_POSTCALL_NORETS
(gdb) x/4i htab_call_hpte_insert1
   0xc0000000000470d8 <.htab_call_hpte_insert1>:        bl      
0xc00000000005f8f0 <pSeries_lpar_hpte_insert>
   0xc0000000000470dc <.htab_call_hpte_insert1+4>:      cmpdi   r3,0
   0xc0000000000470e0 <.htab_call_hpte_insert1+8>:      bge     
0xc000000000047190 <htab_pte_insert_ok>
   0xc0000000000470e4 <.htab_call_hpte_insert1+12>:     cmpdi   r3,-2
(gdb)

NOTE: We still don't support inserting breakpoints.

Before Fix:
(qemu) memsave 0xc0000000000470d8 10 memdump
Invalid parameter 'addr'
(qemu)

After fix:

(qemu)  memsave 0xc0000000000470d8 10 memdump
(qemu)

Changes from V2:
* Address review comments updating "target-ppc: Update slb array with correct 
index values"
* Add new patch "target-ppc: Use #define for max slb entries"
* Drop the patch "target-ppc: Use #define instead of opencoding SLB valid bit"
   because it got picked from last series.

-aneesh