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

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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 <[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 12:49:56 +01:00
commit 7b1dba1f73
2 changed files with 21 additions and 0 deletions
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6
virt/kvm/arm/hyp/vgic-v3-sr.c
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@ -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: