• Avi Kivity's avatar
    x86: Eliminate TS_XSAVE · c9ad4882
    Avi Kivity authored
    The fpu code currently uses current->thread_info->status & TS_XSAVE as
    a way to distinguish between XSAVE capable processors and older processors.
    The decision is not really task specific; instead we use the task status to
    avoid a global memory reference - the value should be the same across all
    threads.
    
    Eliminate this tie-in into the task structure by using an alternative
    instruction keyed off the XSAVE cpu feature; this results in shorter and
    faster code, without introducing a global memory reference.
    
    [ hpa: in the future, this probably should use an asm jmp ]
    Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
    Acked-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
    LKML-Reference: <1273135546-29690-2-git-send-email-avi@redhat.com>
    Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
    c9ad4882
common.c 29.6 KB