• Xiao Guangrong's avatar
    KVM: page track: add the framework of guest page tracking · 21ebbeda
    Xiao Guangrong authored
    The array, gfn_track[mode][gfn], is introduced in memory slot for every
    guest page, this is the tracking count for the gust page on different
    modes. If the page is tracked then the count is increased, the page is
    not tracked after the count reaches zero
    We use 'unsigned short' as the tracking count which should be enough as
    shadow page table only can use 2^14 (2^3 for level, 2^1 for cr4_pae, 2^2
    for quadrant, 2^3 for access, 2^1 for nxe, 2^1 for cr0_wp, 2^1 for
    smep_andnot_wp, 2^1 for smap_andnot_wp, and 2^1 for smm) at most, there
    is enough room for other trackers
    Two callbacks, kvm_page_track_create_memslot() and
    kvm_page_track_free_memslot() are implemented in this patch, they are
    internally used to initialize and reclaim the memory of the array
    Currently, only write track mode is supported
    Signed-off-by: default avatarXiao Guangrong <guangrong.xiao@linux.intel.com>
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Makefile 645 Bytes