From 7b1dba1f7325629427c0e5bdf014159b229d16c8 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Fri, 9 Jun 2017 12:49:56 +0100 Subject: 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 Reviewed-by: Christoffer Dall Signed-off-by: Christoffer Dall --- virt/kvm/arm/hyp/vgic-v3-sr.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'virt') diff --git a/virt/kvm/arm/hyp/vgic-v3-sr.c b/virt/kvm/arm/hyp/vgic-v3-sr.c index b26ce58b012a..79e3c2d3b754 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: -- cgit