• Paul Mackerras's avatar
    KVM: PPC: Book3S HV: Add infrastructure for running HPT guests on radix host · 18c3640c
    Paul Mackerras authored
    This sets up the machinery for switching a guest between HPT (hashed
    page table) and radix MMU modes, so that in future we can run a HPT
    guest on a radix host on POWER9 machines.
    
    * The KVM_PPC_CONFIGURE_V3_MMU ioctl can now specify either HPT or
      radix mode, on a radix host.
    
    * The KVM_CAP_PPC_MMU_HASH_V3 capability now returns 1 on POWER9
      with HV KVM on a radix host.
    
    * The KVM_PPC_GET_SMMU_INFO returns information about the HPT MMU on a
      radix host.
    
    * The KVM_PPC_ALLOCATE_HTAB ioctl on a radix host will switch the
      guest to HPT mode and allocate a HPT.
    
    * For simplicity, we now allocate the rmap array for each memslot,
      even on a radix host, since it will be needed if the guest switches
      to HPT mode.
    
    * Since we cannot yet run a HPT guest on a radix host, the KVM_RUN
      ioctl will return an EINVAL error in that case.
    Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
    18c3640c
book3s_64_mmu_radix.c 17.4 KB