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From: Paolo Bonzini <pbonzini@redhat.com>
Date: Wed, 23 Nov 2011 09:45:52 +0100
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To: qemu-devel@nongnu.org
Cc: linaro-toolchain@lists.linaro.org

On 11/22/2011 04:19 PM, Peter Maydell wrote:
>   * coroutine implementation doesn't cope if libc provides a makecontext()
>     that returns ENOSYS (so we abort on startup)

I have a patch that replaces makecontext() with sigaltstack(), i.e. 
going from nice code that does not work to hideous code that works.

I had not submitted it yet because it does not help for OpenBSD so we 
would need anyway coroutine-gthread.c, and because I would like to test 
it more thoroughly on non-Linux hosts.  If anyone can help with the 
testing, it is at git://github.com/bonzini/qemu.git branch coroutine-fix.

>  * the MAP_FIXED static codegen buffer is put at an address which overlaps
>    the glibc heap so we crash about 50% of the time

For 1.1 we can just use USE_STATIC_CODE_GEN_BUFFER.  It should not have 
major problems on Linux, since it is already tested for linux-user. 
That leaves out Windows of course.

Paolo