[Qemu-devel] [patch] linux-user: problem with mmap_find_vma

[Richard Henderson]

With host x86_64 target alpha, a trivial recompile started producing 
"MMU faults".  Eventually, I determined that adding "-B 0x100000000" was 
enough to produce the fault with the original working executable.  I 
expect, but have not verified, that a similar failure can be elicited 
with any 64-bit host and any target using such a large explicit base.

The cause is that the default address used by mmap_find_vma may not be 
inside the area defined for use by the guest by GUEST_BASE.  Certainly 
this patch fixes the failure I was seeing.

I cannot see though all the macro ugliness to understand what happens 
when GUEST_BASE is not in use to know what needs happening there. 
Please feel free to edit the ??? comment to match reality.


r~

commit-find-vma
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