On Fri, 2018-06-15 at 14:11 +0200, Julian Stecklina wrote: > Yu, > > Regarding your patch to disable AVX with eager fpu disabled in the 4.4 > stable queue: > > https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/queue-4.4/x86-fpu-disable-mpx-when-eagerfpu-is-off.patch > > Why would this be necessary? In the Intel SDM Vol 2, Chapter 2.4, > FPU/SIMD instructions are grouped into different classes and for all of > them CR0.TS triggers a #NM exception in all modes but real mode and > virtual 8086 mode. > > It seems to me lazy context switching of AVX is perfectly functional > (disregarding the recently disclosed security issue). Am I missing > something? > > Julian This is for MPX, not AVX. Yu-cheng
