This sounds like it could be the problem fixed by this:
commit a70daba3771e96cc6b8fd3d11ed297ab13717018
Author: Alexander Graf <ag...@suse.de>
Date: Thu Jun 5 11:39:43 2014 +0200
linux-user: Tell guest about big host page sizes
We tell the guest its page size via AUX vectors. The guest process then uses
this page size as information on which boundaries it can mmap() things.
However, if the host has a bigger page size granularity than the guest, it
can
not fulfill these mmap() requests - which falls apart when MAP_FIXED is
passed
to mmap.
So in that case, let the guest know that we're running on a bigger page size
granularity than the target would require.
This fixes running qemu-ppc (TARGET_PAGE_SIZE=4k) on a 64k page size ppc64
host
for me.
Signed-off-by: Alexander Graf <ag...@suse.de>
Reviewed-by: Richard Henderson <r...@twiddle.net>
or possibly by this:
commit f46e9a0b9911fcfbc13f85f3a8808067990a0f5c
Author: Tom Musta <tommu...@gmail.com>
Date: Thu May 29 09:12:23 2014 -0500
target-ppc: Confirm That .bss Pages Are Valid
The existing code does a check to ensure that a .bss region is properly
mmap'd. When additional mmap is required, the (guest) pages are also
validated. However, this code has a bug: when host page size is larger
than target page size, it is possible for the .bss pages to already be
(host) mapped but the guest .bss pages may not be valid.
The check to mmap additional space is separated from the flagging of the
target (guest) pages, thus ensuring that both aspects are done properly.
Signed-off-by: Tom Musta <tommu...@gmail.com>
Signed-off-by: Alexander Graf <ag...@suse.de>
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https://bugs.launchpad.net/bugs/1349941
Title:
qemu-ppc segfault on simple hello world
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