• Martin Schwidefsky's avatar
    [S390] kvm guest address space mapping · e5992f2e
    Martin Schwidefsky authored
    Add code that allows KVM to control the virtual memory layout that
    is seen by a guest. The guest address space uses a second page table
    that shares the last level pte-tables with the process page table.
    If a page is unmapped from the process page table it is automatically
    unmapped from the guest page table as well.
    The guest address space mapping starts out empty, KVM can map any
    individual 1MB segments from the process virtual memory to any 1MB
    aligned location in the guest virtual memory. If a target segment in
    the process virtual memory does not exist or is unmapped while a
    guest mapping exists the desired target address is stored as an
    invalid segment table entry in the guest page table.
    The population of the guest page table is fault driven.
    Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>