Hi, For guest all program using sysinfo leaks the thread numbers and the uptime of the complete host. For the thread i sent a little patch that seems to do the job. For the uptime i am unable to make one. from: https://elixir.bootlin.com/linux/latest/source/kernel/sys.c#L2503 do_sysinfo => calls ktime_get_boottime_ts64(&tp); =>that calls ktime_get_boottime(); so "in-fine" all the 'uptime fuinctions need to call these 2 functions that leaks the host uptime , they are: https://elixir.bootlin.com/linux/latest/ident/ktime_get_boottime https://elixir.bootlin.com/linux/latest/ident/ktime_get_coarse_boottime i tried something like static inline ktime_t ktime_get_boottime(void) { - return ktime_get_with_offset(TK_OFFS_BOOT); + if (!vx_flags(VXF_VIRT_TIME, 0)) + return ktime_get_with_offset(TK_OFFS_BOOT); + + timespec64 boottime; + vx_vsi_boottime64(&boottime); + + return timespec64_to_ktime(&boottime); } but it fails. Any ideas ? Reagrds, Ghislain. of course if we change those we need to remove the uptime modifier in uptime.c because it also calls ktime_get_boottime_ts64: --- ../linux-4.9.135/fs/proc/uptime.c 2018-10-21 11:45:32.168493146 +0200 +++ fs/proc/uptime.c 2018-12-09 15:50:34.023848023 +0100 @@ -23,8 +23,9 @@ static int uptime_proc_show(struct seq_f idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem); idle.tv_nsec = rem; - if (vx_flags(VXF_VIRT_UPTIME, 0)) - vx_vsi_uptime(&uptime, &idle); seq_printf(m, "%lu.%02lu %lu.%02lu\n", (unsigned long) uptime.tv_sec,