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Re: CVS commit: src/sys/arch/x86/x86
On Tue, Oct 14, 2014 at 03:16:56AM +0000, John Nemeth wrote:
> Module Name: src
> Committed By: jnemeth
> Date: Tue Oct 14 03:16:56 UTC 2014
> Modified Files:
> src/sys/arch/x86/x86: identcpu.c
> Log Message:
> Force x86_xsave_features to 0 when running under XEN for AMD
> processors. This prevents the use of xsave and xrstor thus fixing
> the problem in PR/49150. The basic problem is that the way AMD
> implements those instructions means that information can leak
> between domains so XEN treats them as privileged.
> XXX If anybody else comes up with a better / more "proper" fix, go
> for it. However, this solves the problem I was having. And, given
> that XEN being broken is pretty much a show-stopper for a release,
> something needed to be done.
One option would be to detect the fault at runtime.
David Laight: david%l8s.co.uk@localhost
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