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KVM: arm64: Log an error if trapping a read-from-write-only GICv3 access

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A read-from-write-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 <[email protected]>
Reviewed-by: Christoffer Dall <[email protected]>
Signed-off-by: Christoffer Dall <[email protected]>
This commit is contained in:
Marc Zyngier 2017-06-09 12:49:55 +01:00
commit e7f1d1eef4
2 changed files with 12 additions and 4 deletions
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4
virt/kvm/arm/hyp/vgic-v3-sr.c
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@ -980,6 +980,8 @@ int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu)
break;
case SYS_ICC_EOIR0_EL1:
case SYS_ICC_EOIR1_EL1:
if (unlikely(is_read))
return 0;
fn = __vgic_v3_write_eoir;
break;
case SYS_ICC_GRPEN1_EL1:
@ -1039,6 +1041,8 @@ int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu)
fn = __vgic_v3_write_bpr0;
break;
case SYS_ICC_DIR_EL1:
if (unlikely(is_read))
return 0;
fn = __vgic_v3_write_dir;
break;
case SYS_ICC_RPR_EL1: