xsaves support broken?

[Dave Hansen]

Hi Fenghua,

I was testing some new MPX code, and realized that MPX had stopped
working completely.  The prctl() failed to turn it on, which I tracked
down to a 0 in "BNDCSR" where we expected to see an enable bit.

I realized that I had managed to remove the "noxsaves" boot option from
my kernel.  Re-adding "noxsaves" made MPX work again, and the BNDCSR
contents were properly passed in to the kernel.

Is it possible that  "xsaves" use inside the kernel is simply broken?

Config is here:

	http://sr71.net/~dave/intel/config-20150302
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/