On 19/10/2016 19:24, Radim Krčmář wrote:
>> > +  if (vcpu->arch.st.msr_val & KVM_MSR_ENABLED)
>> > +          if (kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
>> > +                                  &vcpu->arch.st.steal,
>> > +                                  sizeof(struct kvm_steal_time)) == 0) {
>> > +                  vcpu->arch.st.steal.preempted = 1;
>> > +                  kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
>> > +                                  &vcpu->arch.st.steal,
>> > +                                  sizeof(struct kvm_steal_time));
>> > +          }
> Please name this block of code.  Something like
>   kvm_steal_time_set_preempted(vcpu);

While at it:

1) the kvm_read_guest_cached is not necessary.  You can rig the call to
kvm_write_guest_cached so that it only writes vcpu->arch.st.steal.preempted.

2) split the patch in host and guest sides.

Paolo
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