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Re: [Xen-devel] [Patch] Enable SMEP CPU feature support for XEN itself

  • To: "Li, Xin" <xin.li@xxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>, "Yang, Wei Y" <wei.y.yang@xxxxxxxxx>
  • From: Keir Fraser <keir.xen@xxxxxxxxx>
  • Date: Thu, 02 Jun 2011 20:24:24 +0100
  • Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Thu, 02 Jun 2011 12:25:06 -0700
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  • Thread-topic: [Xen-devel] [Patch] Enable SMEP CPU feature support for XEN itself

On 02/06/2011 15:36, "Li, Xin" <xin.li@xxxxxxxxx> wrote:

>> } else
>>> setup_clear_cpu_cap(X86_FEATURE_SMEP);
> This needs to be done on APs too.  Thus I think we still need define
> setup_smep as __cpuinit.

The whole point of setup_clear_cpu_cap() is that it only needs to run on the
BP and the change gets picked up by every AP automatically as it boots.

 -- Keir

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