Re: [Xen-devel] Re: [Xen-changelog] Fix NX/XD enable on secondary CPUs.

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

Does EFER_NX need setting for 32-bit PAE?

We don't set it for *any* cpus in x86_32 builds, even cpu0...

 -- Keir

On 13 Jul 2005, at 11:17, Gerd Knorr wrote:

> I think I have this problem with PAE as well.  Machine is SMP
> (hyperthreaded).  PAE dom0 boots fine on CPU #0.  PAE domU is bound to
> CPU #1 by default and boots to the login prompt as well, but only with
> NX disabled (and network disabled, but that's another story ...).
>
> With NX-enabled domU boot I get this ...
>
>   (XEN) (file=traps.c, line=872) Non-priv domain attempted 
> RDMSR(c0000080,00000000,20100000).
>   (XEN) (file=traps.c, line=864) Non-priv domain attempted 
> WRMSR(c0000080,00000800,00000000).
> ... and the kernel crashes shortly later, I guess due to NX pte entry
> without NX being enabled on CPU #1.  It crashes right after the first
> set_fixmap call which creates a pte entry with NX set.

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