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x86: switch vdso TSC timecounter to RDTSCP on AMD Zen CPUs 

Reported by:	many
Tested by:	gallatin, mikael, rhurlin
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Konstantin Belousov 2021-01-21 14:54:28 +02:00
parent 9f47eeffa3
commit 523d94dbea
1 changed files with 1 additions and 4 deletions
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5
lib/libc/x86/sys/__vdso_gettc.c
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@ -125,7 +125,7 @@ struct tsc_selector_tag {
};
static const struct tsc_selector_tag tsc_selector[] = {
[0] = { /* Intel or AMD Zen+, LFENCE */
[0] = { /* Intel, LFENCE */
.ts_rdtsc32 = rdtsc32_mb_lfence,
.ts_rdtsc_low = rdtsc_low_mb_lfence,
},
@ -164,9 +164,6 @@ tsc_selector_idx(u_int cpu_feature)
do_cpuid(1, p);
cpu_id = p[0];
if (amd_cpu && CPUID_TO_FAMILY(cpu_id) >= 0x17)
return (0);
if (cpu_feature != 0) {
do_cpuid(0x80000000, p);
cpu_exthigh = p[0];