PML_LOG_NR_ENTRIES
if (vmcs12->guest_pml_index >= PML_LOG_NR_ENTRIES) {
pml_tail_index = (pml_idx >= PML_LOG_NR_ENTRIES) ? 0 : pml_idx + 1;
kvm->arch.cpu_dirty_log_size = PML_LOG_NR_ENTRIES;
#define PML_HEAD_INDEX (PML_LOG_NR_ENTRIES-1)