On 2018-09-19 07:55:51 [+0200], Paolo Bonzini wrote: > A kthread can do use_mm/unuse_mm. indeed. The FPU struct for the kernel thread isn't valid / does not contain the expected PKRU value. So loading the pkru value from the struct FPU does not work as expected. We could set it to 0 for a kernel thread so we don't end up with a random value. If we want to get this usecase working then we would have to move pkru value from FPU to mm_struct and consider it in use_mm(). Do we want this? > Paolo Sebastian
