CVS commit: src/sys/arch/xen/xen

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Thu May 22 12:08:57 UTC 2025

Modified Files:
        src/sys/arch/xen/xen: xen_clock.c

Log Message:
xen: Use ordered rdtsc() function, rather than inline rdtsc asm.

This will issue either lfence, mfence, or cpuid before the rdtsc
instruction, depending on the CPU identification, in order to prevent
reordering with respect to surrounding loads -- particularly those
used to query the host's systime parameters.

May help with:

PR port-xen/59437: Xen time stability


To generate a diff of this commit:
cvs rdiff -u -r1.21 -r1.22 src/sys/arch/xen/xen/xen_clock.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.