KVM: arm64: Log an error if trapping a write-to-read-only GICv3 access
A write-to-read-only GICv3 access should UNDEF at EL1. But since
we're in complete paranoia-land with broken CPUs, let's assume the
worse and gracefully handle the case.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
diff --git a/virt/kvm/arm/hyp/vgic-v3-sr.c b/virt/kvm/arm/hyp/vgic-v3-sr.c
index b26ce58..79e3c2d 100644
--- a/virt/kvm/arm/hyp/vgic-v3-sr.c
+++ b/virt/kvm/arm/hyp/vgic-v3-sr.c
@@ -976,6 +976,8 @@ int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu)
switch (sysreg) {
case SYS_ICC_IAR0_EL1:
case SYS_ICC_IAR1_EL1:
+ if (unlikely(!is_read))
+ return 0;
fn = __vgic_v3_read_iar;
break;
case SYS_ICC_EOIR0_EL1:
@@ -1026,6 +1028,8 @@ int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu)
break;
case SYS_ICC_HPPIR0_EL1:
case SYS_ICC_HPPIR1_EL1:
+ if (unlikely(!is_read))
+ return 0;
fn = __vgic_v3_read_hppir;
break;
case SYS_ICC_GRPEN0_EL1:
@@ -1046,6 +1050,8 @@ int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu)
fn = __vgic_v3_write_dir;
break;
case SYS_ICC_RPR_EL1:
+ if (unlikely(!is_read))
+ return 0;
fn = __vgic_v3_read_rpr;
break;
case SYS_ICC_CTLR_EL1: