• Paul Mackerras's avatar
    KVM: PPC: Book3S HV: Create debugfs file for each guest's HPT · e23a808b
    Paul Mackerras authored
    This creates a debugfs directory for each HV guest (assuming debugfs
    is enabled in the kernel config), and within that directory, a file
    by which the contents of the guest's HPT (hashed page table) can be
    read.  The directory is named vmnnnn, where nnnn is the PID of the
    process that created the guest.  The file is named "htab".  This is
    intended to help in debugging problems in the host's management
    of guest memory.
    
    The contents of the file consist of a series of lines like this:
    
      3f48 4000d032bf003505 0000000bd7ff1196 00000003b5c71196
    
    The first field is the index of the entry in the HPT, the second and
    third are the HPT entry, so the third entry contains the real page
    number that is mapped by the entry if the entry's valid bit is set.
    The fourth field is the guest's view of the second doubleword of the
    entry, so it contains the guest physical address.  (The format of the
    second through fourth fields are described in the Power ISA and also
    in arch/powerpc/include/asm/mmu-hash64.h.)
    Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
    e23a808b
book3s_hv.c 65 KB