port-amd64/55603: modules/t_x86_pte:svs_g_bit_set test case fails under qemu -accel nvmm

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         55603
>Category:       port-amd64
>Synopsis:       modules/t_x86_pte:svs_g_bit_set test case fails under qemu -accel nvmm
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Aug 24 09:55:00 +0000 2020
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
>Organization:
>Environment:
System: NetBSD
Architecture: x86_64
Machine: amd64
>Description:

The modules/t_x86_pte:svs_g_bit_set test case fails under
"qemu-system-x86_64 -accel nvmm".  For example:

  http://www.gson.org/netbsd/bugs/build/amd64/2020/2020.08.23.22.49.45/test.html#modules_t_x86_pte_svs_g_bit_set

>How-To-Repeat:

>Fix: