On 30/11/20 14:35, Maxim Levitsky wrote:
+ if (guest_cpuid_has(vcpu, X86_FEATURE_TSC_ADJUST)) {
+ tsc_state.tsc_adjust = vcpu->arch.ia32_tsc_adjust_msr;
+ tsc_state.flags |= KVM_TSC_STATE_TSC_ADJUST_VALID;
+ }
This is mostly useful for userspace that doesn't disable the quirk, right?
+ kvm_get_walltime(&wall_nsec, &host_tsc);
+ diff = wall_nsec - tsc_state.nsec;
+
+ if (diff < 0 || tsc_state.nsec == 0)
+ diff = 0;
+
diff < 0 should be okay. Also why the nsec==0 special case? What about
using a flag instead?
Paolo
