Re: [Xen-devel] Linux'es SLUB incompatible with Xen?

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-09-25 at 09:23 +0100, Jan Beulich wrote:
> Linux-Xen maintainers,
> 
> are you aware that SLUB's use of percpu_cmpxchg16b_double() is
> currently incompatible with Xen when run on old, not cmpxchg16b
> capable x86-64 CPUs (the problem being this_cpu_cmpxchg16b_emu's
> non-paravirtualized use of CLI)? Or is that a simple "we don't care -
> don't run Xen on such old systems" (despite everything else, including
> the hypervisor, working fine there)?

Out of curiosity what is it about Xen that triggers this, as opposed to
failing on native?

Ian.


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