KVM: arm64: vgic-v3: Add ICV_BPR0_EL1 handler

[mirror_ubuntu-zesty-kernel.git] / virt / kvm / arm / hyp / vgic-v3-sr.c

diff --git a/virt/kvm/arm/hyp/vgic-v3-sr.c b/virt/kvm/arm/hyp/vgic-v3-sr.c
index 36272a12c19d03afd8a549a6019ed73800ce64df..8e51d9b4f5e911188358dae9522d2ea7aa2b06aa 100644 (file)
--- a/virt/kvm/arm/hyp/vgic-v3-sr.c
+++ b/virt/kvm/arm/hyp/vgic-v3-sr.c
@@ -755,11 +755,33 @@ static void __hyp_text __vgic_v3_write_igrpen1(struct kvm_vcpu *vcpu, u32 vmcr,
        __vgic_v3_write_vmcr(vmcr);
 }
 
+static void __hyp_text __vgic_v3_read_bpr0(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+       vcpu_set_reg(vcpu, rt, __vgic_v3_get_bpr0(vmcr));
+}
+
 static void __hyp_text __vgic_v3_read_bpr1(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
 {
        vcpu_set_reg(vcpu, rt, __vgic_v3_get_bpr1(vmcr));
 }
 
+static void __hyp_text __vgic_v3_write_bpr0(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+       u64 val = vcpu_get_reg(vcpu, rt);
+       u8 bpr_min = __vgic_v3_bpr_min() - 1;
+
+       /* Enforce BPR limiting */
+       if (val < bpr_min)
+               val = bpr_min;
+
+       val <<= ICH_VMCR_BPR0_SHIFT;
+       val &= ICH_VMCR_BPR0_MASK;
+       vmcr &= ~ICH_VMCR_BPR0_MASK;
+       vmcr |= val;
+
+       __vgic_v3_write_vmcr(vmcr);
+}
+
 static void __hyp_text __vgic_v3_write_bpr1(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
 {
        u64 val = vcpu_get_reg(vcpu, rt);
@@ -937,6 +959,12 @@ int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu)
        case ICC_HPPIR1_EL1:
                fn = __vgic_v3_read_hppir;
                break;
+       case ICC_BPR0_EL1:
+               if (is_read)
+                       fn = __vgic_v3_read_bpr0;
+               else
+                       fn = __vgic_v3_write_bpr0;
+               break;
        default:
                return 0;
        }