KVM: arm64: GICv4.1: Allow non-trapping WFI when using HW SGIs

Just like for VLPIs, it is beneficial to avoid trapping on WFI when the
vcpu is using the GICv4.1 SGIs.

Add such a check to vcpu_clear_wfx_traps().
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20200304203330.4967-23-maz@kernel.org

arch/arm64/include/asm/kvm_emulate.h

@@ -89,7 +89,8 @@ static inline unsigned long *vcpu_hcr(struct kvm_vcpu *vcpu)
 static inline void vcpu_clear_wfx_traps(struct kvm_vcpu *vcpu)
 {
 	vcpu->arch.hcr_el2 &= ~HCR_TWE;
-	if (atomic_read(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vlpi_count))
+	if (atomic_read(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vlpi_count) ||
+	    vcpu->kvm->arch.vgic.nassgireq)
 		vcpu->arch.hcr_el2 &= ~HCR_TWI;
 	else
 		vcpu->arch.hcr_el2 |= HCR_TWI;