Re: CVS commit: [netbsd-7] src/sys/arch/x86/x86

[John Nemeth <jnemeth%cue.bc.ca@localhost>]

On Oct 30,  6:58pm, "Martin Husemann" wrote:
} 
} Module Name:	src
} Committed By:	martin
} Date:		Thu Oct 30 18:58:45 UTC 2014
} 
} Modified Files:
} 	src/sys/arch/x86/x86 [netbsd-7]: identcpu.c
} 
} Log Message:
} Pull up following revision(s) (requested by riz in ticket #171):
} 	sys/arch/x86/x86/identcpu.c: revision 1.46
} 	sys/arch/x86/x86/identcpu.c: revision 1.47
} Force x86_xsave_features to 0 when running under XEN.
} 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.

     As discovered by riz, and noted with 1.47, the issue isn't
just restricted to AMD CPUs.  Of course, riz did discover the issue
with an Intel CPU on an aws instance running an ancient version of
Xen, so the issue may be related to that (the ancient version of
Xen).

}-- End of excerpt from "Martin Husemann"