[Xen-devel] X86EMUL_CMPXCHG_FAILED

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

Hello,

Now that "x86/hvm: implement hvmemul_write() using real mappings" is in, 
we can start working again on implementing hvmemul_cmpxchg() with a real 
CMPXCHG, and finally fix the SMP emulation race upstream.
However, in order to do that we would need X86EMUL_CMPXCHG_FAILED which 
has been dropped by Andrew here:
https://patchwork.kernel.org/patch/9449339/

and re-contributed by Jan here:

https://patchwork.kernel.org/patch/9651613/

(the patch is a combination of Jan's patch and my fumbling with CMPXCHG).

However, I remember Jan saying that his patch is no longer the way to go 
here. How should we proceed?

Thanks,
Razvan

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