Eiichi Tsukata <eiichi.tsukata@xxxxxxxxxxx> writes: > FYI: The EINVAL in vmx_set_nested_state() is caused by the following condition: > * vcpu->arch.hflags == 0 > * kvm_state->hdr.vmx.smm.flags == KVM_STATE_NESTED_SMM_VMXON This is a weird state indeed, 'vcpu->arch.hflags == 0' means we're not in SMM and not in guest mode but kvm_state->hdr.vmx.smm.flags == KVM_STATE_NESTED_SMM_VMXON is a reflection of vmx->nested.smm.vmxon (see vmx_get_nested_state()). vmx->nested.smm.vmxon gets set (conditioally) in vmx_enter_smm() and gets cleared in vmx_leave_smm() which means the vCPU must be in SMM to have it set. In case the vCPU is in SMM upon migration, HF_SMM_MASK must be set from kvm_vcpu_ioctl_x86_set_vcpu_events() -> kvm_smm_changed() but QEMU's kvm_put_vcpu_events() calls kvm_put_nested_state() _before_ kvm_put_vcpu_events(). This can explain "vcpu->arch.hflags == 0". Paolo, Max, any idea how this is supposed to work? -- Vitaly
