tz_vmm : VM access a address which isn't allowed

[chirag garg]

Hi all,

I am trying to run *tz_vmm* script on the *imx6 platform*. In which I have
tried to put Genode (without trustzone) OS image instead of linux image as
a guest OS which is configured according to normal world. we changed the
CSU also according to imx6 security manual. So now we are getting the
following error :


Starting kernel ...

kernel initialized
Genode 14.08
int main(): --- create local services ---
Core virtual memory allocator
---------------------
Allocator 101318e4 dump:
 Block: [00001000,00002000) size=00001000 avail=00000000 max_avail=00000000
 Block: [00002000,00003000) size=00001000 avail=00000000 max_avail=00000000
 Block: [00003000,00004000) size=00001000 avail=00000000 max_avail=ef9c1000
 Block: [00004000,00005000) size=00001000 avail=00000000 max_avail=00000000
 Block: [00005000,00006000) size=00001000 avail=00000000 max_avail=00000000
 Block: [00006000,10001000) size=0fffb000 avail=0fffb000 max_avail=ef9c1000
 Block: [1062f000,ffff0000) size=ef9c1000 avail=ef9c1000 max_avail=ef9c1000
 => mem_size=4288417792 (4089 MB) / mem_avail=4288397312 (4089 MB)

RAM memory allocator
---------------------
Allocator 10130888 dump:
 Block: [10000000,10001000) size=00001000 avail=00000000 max_avail=00000000
 Block: [1062f000,10630000) size=00001000 avail=00000000 max_avail=00000000
 Block: [10630000,10631000) size=00001000 avail=00000000 max_avail=00000000
 Block: [10631000,10632000) size=00001000 avail=00000000 max_avail=1f9cd000
 Block: [10632000,10633000) size=00001000 avail=00000000 max_avail=00000000
 Block: [10633000,30000000) size=1f9cd000 avail=1f9cd000 max_avail=1f9cd000
 => mem_size=530391040 (505 MB) / mem_avail=530370560 (505 MB)

IO memory allocator
-------------------
Allocator 1013294c dump:
 Block: [00000000,00a00000) size=00a00000 avail=00a00000 max_avail=00a00000
 Block: [00a02000,020d0000) size=016ce000 avail=016ce000 max_avail=016ce000
 Block: [020d4000,021c0000) size=000ec000 avail=000ec000 max_avail=20000000
 Block: [021c1000,021e8000) size=00027000 avail=00027000 max_avail=00027000
 Block: [021ec000,10000000) size=0de14000 avail=0de14000 max_avail=20000000
 Block: [30000000,50000000) size=20000000 avail=20000000 max_avail=20000000
 => mem_size=805261312 (767 MB) / mem_avail=805261312 (767 MB)

IRQ allocator
-------------------
Allocator 101339a8 dump:
 Block: [00000000,00000400) size=00000400 avail=00000400 max_avail=00000400
 => mem_size=1024 (0 MB) / mem_avail=1024 (0 MB)

int main(): --- start init ---
int main(): transferred 505 MB to init
int main(): --- init created, waiting for exit condition ---
[init] Could not open file "ld.lib.so"
[init] parent provides
[init]   service "ROM"
[init]   service "RAM"
[init]   service "IRQ"
[init]   service "IO_MEM"
[init]   service "CAP"
[init]   service "PD"
[init]   service "RM"
[init]   service "CPU"
[init]   service "LOG"
[init]   service "SIGNAL"
[init]   service "VM"
[init] child "tz_vmm"
[init]   RAM quota:  3932160
[init]   ELF binary: tz_vmm
[init]   priority:   0
[init -> tz_vmm] Start virtual machine
[init -> tz_vmm] *Vm tried to access 30008040 which isn't allowed*
[init -> tz_vmm] Cpu state:
[init -> tz_vmm]   Register     Virt     Phys
[init -> tz_vmm] ---------------------------------
[init -> tz_vmm]   r0         = 00000000 [00000000]
[init -> tz_vmm]   r1         = 00000eb9 [00000000]
[init -> tz_vmm]   r2         = 30000100 [00000000]
[init -> tz_vmm]   r3         = 00000000 [00000000]
[init -> tz_vmm]   r4         = 00000000 [00000000]
[init -> tz_vmm]   r5         = 00000000 [00000000]
[init -> tz_vmm]   r6         = 00000000 [00000000]
[init -> tz_vmm]   r7         = 00000000 [00000000]
[init -> tz_vmm]   r8         = 00000000 [00000000]
[init -> tz_vmm]   r9         = 00000000 [00000000]
[init -> tz_vmm]   r10        = 00000000 [00000000]
[init -> tz_vmm]   r11        = 00000000 [00000000]
[init -> tz_vmm]   r12        = 00000000 [00000000]
[init -> tz_vmm]   sp         = 00000000 [00000000]
[init -> tz_vmm]   lr         = 00000000 [00000000]
[init -> tz_vmm]   ip         = 30008000 [00000000]
[init -> tz_vmm]   cpsr       = 00000093
[init -> tz_vmm]   sp_und     = 00000000 [00000000]
[init -> tz_vmm]   lr_und     = 00000000 [00000000]
[init -> tz_vmm]   spsr_und   = 00000000 [00000000]
[init -> tz_vmm]   sp_svc     = 00000000 [00000000]
[init -> tz_vmm]   lr_svc     = 00000000 [00000000]
[init -> tz_vmm]   spsr_svc   = 00000000 [00000000]
[init -> tz_vmm]   sp_abt     = 00000000 [00000000]
[init -> tz_vmm]   lr_abt     = 00000000 [00000000]
[init -> tz_vmm]   spsr_abt   = 00000000 [00000000]
[init -> tz_vmm]   sp_irq     = 00000000 [00000000]
[init -> tz_vmm]   lr_irq     = 00000000 [00000000]
[init -> tz_vmm]   spsr_irq   = 00000000 [00000000]
[init -> tz_vmm]   sp_fiq     = 00000000 [00000000]
[init -> tz_vmm]   lr_fiq     = 00000000 [00000000]
[init -> tz_vmm]   spsr_fiq   = 00000000 [00000000]
[init -> tz_vmm]   ttbr0      = 112a1041
[init -> tz_vmm]   ttbr1      = 93a2c043
[init -> tz_vmm]   ttbrc      = 00000000
[init -> tz_vmm]   dfar       = 00000000 [00000000]
[init -> tz_vmm]   *exception  = data_abort*
[init -> tz_vmm] *Could not handle data-abort will exit!*
[init -> tz_vmm] *Destructing undissolved signal context*

I divided the RAM into two portions: 0x10000000-0x30000000 for secure world
and 0x30000000-0x50000000 for Normal world.

After VM start, we are getting "*VM tried to access 30008040 which isn't
allowed"  *error. Also, tried to compile the image by changing this address
to 0x10001000 in the file spec_hw_imx6.mk file (for the normal world OS
image). We get the same error as above but only with the memory address
changed in the error message.
Kindly let us know the possible reasons behind getting this error.

Thanks in advance.

Regards

Chirag Garg
IIT Madras , Rise Lab
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