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ARM: KVM: don't special case PC when doing an MMIO
Admitedly, reading a MMIO register to load PC is very weird. Writing PC to a MMIO register is probably even worse. But the architecture doesn't forbid any of these, and injecting a Prefetch Abort is the wrong thing to do anyway. Remove this check altogether, and let the adventurous guest wander into LaLaLand if they feel compelled to do so. Reported-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
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2 changed files with 0 additions and 11 deletions
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@ -65,11 +65,6 @@ static inline bool vcpu_mode_priv(struct kvm_vcpu *vcpu)
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return cpsr_mode > USR_MODE;;
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}
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static inline bool kvm_vcpu_reg_is_pc(struct kvm_vcpu *vcpu, int reg)
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{
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return reg == 15;
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}
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static inline u32 kvm_vcpu_get_hsr(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.fault.hsr;
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@ -86,12 +86,6 @@ static int decode_hsr(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
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sign_extend = kvm_vcpu_dabt_issext(vcpu);
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rt = kvm_vcpu_dabt_get_rd(vcpu);
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if (kvm_vcpu_reg_is_pc(vcpu, rt)) {
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/* IO memory trying to read/write pc */
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kvm_inject_pabt(vcpu, kvm_vcpu_get_hfar(vcpu));
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return 1;
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}
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mmio->is_write = is_write;
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mmio->phys_addr = fault_ipa;
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mmio->len = len;
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