• Paul Mackerras's avatar
    powerpc/64: Enable use of radix MMU under hypervisor on POWER9 · cc3d2940
    Paul Mackerras authored
    To use radix as a guest, we first need to tell the hypervisor via
    the ibm,client-architecture call first that we support POWER9 and
    architecture v3.00, and that we can do either radix or hash and
    that we would like to choose later using an hcall (the
    H_REGISTER_PROC_TBL hcall).
    
    Then we need to check whether the hypervisor agreed to us using
    radix.  We need to do this very early on in the kernel boot process
    before any of the MMU initialization is done.  If the hypervisor
    doesn't agree, we can't use radix and therefore clear the radix
    MMU feature bit.
    
    Later, when we have set up our process table, which points to the
    radix tree for each process, we need to install that using the
    H_REGISTER_PROC_TBL hcall.
    Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    cc3d2940
mmu.h 4.09 KB