KVM: arm64: Set kvm_vcpu::pre_pcpu properly

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4BLL0
CVE: NA

--------------------------------

kvm_vcpu::pre_pcpu was introduced in commit bf9f6ac8 ("KVM: Update
Posted-Interrupts Descriptor when vCPU is blocked") but has so far only
been used by x86.

Set it properly on the vcpu_put() path for arm64.
Signed-off-by: NZenghui Yu <yuzenghui@huawei.com>
Reviewed-by: NCheng Jian <cj.chengjian@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

virt/kvm/arm/arm.c

@@ -466,6 +466,7 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 	kvm_vgic_put(vcpu);
 	kvm_vcpu_pmu_restore_host(vcpu);
 
+	vcpu->pre_pcpu = vcpu->cpu;
 	vcpu->cpu = -1;
 
 	kvm_arm_set_running_vcpu(NULL);