On 27/05/21 10:33, Stamatis, Ilias wrote:
#ifdef CONFIG_X86_64
@@ -10444,6 +10461,7 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
return;
vcpu_load(vcpu);
kvm_synchronize_tsc(vcpu, 0);
+ kvm_vcpu_write_tsc_multiplier(vcpu, kvm_default_tsc_scaling_ratio);
Hmm, I'm actually thinking now that this might not be correct. For example in
case we hotplug a new vCPU but the other vCPUs don't use the default ratio.
It is correct, the TSC frequency can be set per CPU (which is useless
except possibly for debugging OS timekeeping, but still). So, the
default kHz after hotplug is the host frequency.
It doesn't really matter because it only affects the fixed delta between
the hotplugged CPU and the others as soon as userspace sets the
frequency to the correct value.
Paolo
