• Alexander Graf's avatar
    KVM: PPC: Improve split mode · f7bc74e1
    Alexander Graf authored
    When in split mode, instruction relocation and data relocation are not equal.
    
    So far we implemented this mode by reserving a special pseudo-VSID for the
    two cases and flushing all PTEs when going into split mode, which is slow.
    
    Unfortunately 32bit Linux and Mac OS X use split mode extensively. So to not
    slow down things too much, I came up with a different idea: Mark the split
    mode with a bit in the VSID and then treat it like any other segment.
    
    This means we can just flush the shadow segment cache, but keep the PTEs
    intact. I verified that this works with ppc32 Linux and Mac OS X 10.4
    guests and does speed them up.
    Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
    Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
    f7bc74e1
kvm_book3s.h 6.51 KB