[PATCH v2 2/2] KVM: x86: use x86_get_freq to get freq for kvmclock

zhenwei pi
2021-12-01T02:49:26Z

If the host side supports APERF&MPERF feature, the guest side may get
mismatched frequency.

KVM uses x86_get_cpufreq_khz() to get the same frequency for guest side.

Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
---
arch/x86/kvm/x86.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5a403d92833f..125ed3c8b21a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8305,10 +8305,8 @@ static void tsc_khz_changed(void *data)

if (data)
khz = freq->new;
- else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
- khz = cpufreq_quick_get(raw_smp_processor_id());
if (!khz)
- khz = tsc_khz;
+ khz = x86_get_cpufreq_khz(raw_smp_processor_id());
__this_cpu_write(cpu_tsc_khz, khz);
}

--
2.25.1