• Paul Mackerras's avatar
    KVM: PPC: Book3S HV: Framework and hcall stubs for nested virtualization · 8e3f5fc1
    Paul Mackerras authored
    This starts the process of adding the code to support nested HV-style
    virtualization.  It defines a new H_SET_PARTITION_TABLE hypercall which
    a nested hypervisor can use to set the base address and size of a
    partition table in its memory (analogous to the PTCR register).
    On the host (level 0 hypervisor) side, the H_SET_PARTITION_TABLE
    hypercall from the guest is handled by code that saves the virtual
    PTCR value for the guest.
    
    This also adds code for creating and destroying nested guests and for
    reading the partition table entry for a nested guest from L1 memory.
    Each nested guest has its own shadow LPID value, different in general
    from the LPID value used by the nested hypervisor to refer to it.  The
    shadow LPID value is allocated at nested guest creation time.
    
    Nested hypervisor functionality is only available for a radix guest,
    which therefore means a radix host on a POWER9 (or later) processor.
    Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
    Reviewed-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    8e3f5fc1
book3s_hv_nested.c 7.06 KB