void ram_handle_compressed(void *host, uint8_t ch, uint64_t size) { if (ch != 0 || !is_zero_range(host, size)) { memset(host, ch, size); #ifndef _WIN32 if (ch == 0 && (!kvm_enabled() || kvm_has_sync_mmu())) { size = size & ~(getpagesize() - 1); if (size > 0) { qemu_madvise(host, size, QEMU_MADV_DONTNEED); } } #endif } }