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Re: [Qemu-devel] [Android-virt] plans for QEMU support for KVM on ARM


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [Android-virt] plans for QEMU support for KVM on ARM
Date: Wed, 23 Nov 2011 09:45:52 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20110930 Thunderbird/7.0.1

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




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