[src/trunk]: src/sys/arch/x86/x86 Penalize TSC on VirtualBox because it is no...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f668694d38fd
branches:  trunk
changeset: 959562:f668694d38fd
user:      christos <christos%NetBSD.org@localhost>
date:      Fri Feb 19 02:15:58 2021 +0000

description:
Penalize TSC on VirtualBox because it is not accurate enough.

diffstat:

 sys/arch/x86/x86/tsc.c |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (27 lines):

diff -r 3a5b21d9f22a -r f668694d38fd sys/arch/x86/x86/tsc.c
--- a/sys/arch/x86/x86/tsc.c    Fri Feb 19 02:15:24 2021 +0000
+++ b/sys/arch/x86/x86/tsc.c    Fri Feb 19 02:15:58 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: tsc.c,v 1.53 2021/02/17 06:33:47 rillig Exp $  */
+/*     $NetBSD: tsc.c,v 1.54 2021/02/19 02:15:58 christos Exp $        */
 
 /*-
  * Copyright (c) 2008, 2020 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: tsc.c,v 1.53 2021/02/17 06:33:47 rillig Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tsc.c,v 1.54 2021/02/19 02:15:58 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -224,6 +224,8 @@
                invariant = false;
        } else if (vm_guest == VM_GUEST_NO) {
                delay_func = tsc_delay;
+       } else if (vm_guest == VM_GUEST_VIRTUALBOX) {
+               tsc_timecounter.tc_quality = -100;
        }
 
        if (tsc_freq != 0) {