Re: [Qemu-devel] Qemu and mmap_min_addr

[Jussi Hakala <jussi.hakala@hut.fi>]

Celebrated too early.

My initial tests without the patch gave permission denied, and with the 
patch an error as expected (lenny's qemu not being able to run binaries 
generated by the cs2008q1 compiler).

Added some patches from [1], and tried running the hello world 
application again but with the GUEST_BASE being different from 0, the 
qemu seems just to hang when trying to mmap. CPU load is ~ 1.0 but 
nothing happens after mmap2() call [2].

Without the GUEST_BASE modification (and with a reasonably low 
mmap_min_addr), the binaries run just fine.

Regards,

   Jussi

[1]
http://qemu-arm-eabi.wiki.sourceforge.net/

[2]
mmap2(0x91000, 4096, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, 0, 0) = 0x91000

Jussi Hakala wrote:
> Paul Brook wrote:
>> You have to use a nonzero GUEST_BASE to offset the guest VM.  However 
>> this hasn't been tested in a while, and has probably bitrotted.
> 
> For preliminary testing, setting GUEST_BASE to 65536 seemed to work. 
> I'll investigate further and report back to you :)