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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 <marc.zyngier@arm.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
This commit is contained in:
Marc Zyngier
2017-06-09 12:49:55 +01:00
parent 2873b5082c
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: