arm64: KVM: Make unexpected reads from WO registers inject an undef

Reads from write-only system registers are generally confined to
EL1 and not propagated to EL2 (that's what the architecture
mantates). In order to be sure that we have a sane behaviour
even in the unlikely event that we have a broken system, we still
handle it in KVM.

In that case, let's inject an undef into the guest.

Let's also remove write_to_read_only which isn't used anywhere.

Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

1 files changed, 0 insertions, 18 deletions

diff --git a/arch/arm64/kvm/sys_regs.h b/arch/arm64/kvm/sys_regs.h
index 9c6ffd0f0196..638f724e45af 100644
--- a/arch/arm64/kvm/sys_regs.h
+++ b/arch/arm64/kvm/sys_regs.h
@@ -83,24 +83,6 @@ static inline bool read_zero(struct kvm_vcpu *vcpu,
 	return true;
 }
 
-static inline bool write_to_read_only(struct kvm_vcpu *vcpu,
-				      const struct sys_reg_params *params)
-{
-	kvm_debug("sys_reg write to read-only register at: %lx\n",
-		  *vcpu_pc(vcpu));
-	print_sys_reg_instr(params);
-	return false;
-}
-
-static inline bool read_from_write_only(struct kvm_vcpu *vcpu,
-					const struct sys_reg_params *params)
-{
-	kvm_debug("sys_reg read to write-only register at: %lx\n",
-		  *vcpu_pc(vcpu));
-	print_sys_reg_instr(params);
-	return false;
-}
-
 /* Reset functions */
 static inline void reset_unknown(struct kvm_vcpu *vcpu,
 				 const struct sys_reg_desc *r)