On Wed, 17 Apr 2019, Fenghua Yu wrote: > The kernel option clearcpuid currently only takes feature bit which > can be changed from kernel to kernel. > > Extend clearcpuid to use cap flag string, which is defined in > x86_cap_flags[] and won't be changed from kernel to kernel. > And user can easily get the cap flag string from /proc/cpuinfo. If your machine dies because init triggers #AC then please explain how that easily can be read from /proc/cpuinfo and how the sysadmin can figure out what the heck he needs to write on the kernel command line. The whole 'clearcpuid' thing should have never been merged. It's a pure testing/debugging thing. And no, we are not going to proliferate it and extend it for dubious value. Quite the contrary, we should simply rip it out. Add a simple 'noac' or whatever command line option, which is documented proper and can easily be mapped to a #AC crash during boot. Thanks, tglx
