Re: [PATCH 15/19] kvm: x86: Save and restore guest XFD_ERR properly

[Paolo Bonzini]

On 12/8/21 01:03, Yang Zhong wrote:
>   		kvm_steal_time_set_preempted(vcpu);
>   	srcu_read_unlock(&vcpu->kvm->srcu, idx);
>   
> +	if (vcpu->preempted)
> +		fpu_save_guest_xfd_err(&vcpu->arch.guest_fpu);
> +

Instead of checking vcpu->preempted, can you instead check if the active 
FPU is the guest FPU?  That is, save if 
current->thread.fpu->fpstate->is_guest?

Paolo