• Chris Metcalf's avatar
    tile: support new Tilera hypervisor · c539914d
    Chris Metcalf authored
    The Tilera hypervisor shipped in releases up through MDE 4.1 launches
    the client operating system (i.e. Linux) at privilege level 1 (PL1).
    Starting with MDE 4.2, as part of the work to enable KVM, the
    Tilera hypervisor launches Linux at PL2 instead.
    This commit makes the KERNEL_PL option default to 2 for tilegx, while
    still saying at 1 for tilepro, which doesn't have an updated hypervisor.
    It also explains how and when you might want to choose another value.
    In addition, we change a small buglet in the on-chip Ethernet driver,
    where we were failing to use the KERNEL_PL constant in an API call.
    To make the transition cleaner, this change also provides the updated
    hv_init() API for the new hypervisor that supports announcing Linux's
    compiled-in PL, so the hypervisor can generate a suitable error in the
    case of a mismatched hypervisor and Linux binary.
    Signed-off-by: default avatarChris Metcalf <cmetcalf@tilera.com>
    Cc: stable@vger.linux.org
tilegx.c 53 KB