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authorMarc Zyngier <marc.zyngier@arm.com>2017-03-27 17:03:40 +0100
committerChristoffer Dall <cdall@linaro.org>2017-04-09 07:49:14 -0700
commit7b5b4df1a79954e0b208630fc63b16ec0231a516 (patch)
tree3fba4ba68bdf72da6756e7f5523251ebfd73cd46 /arch/arm64/kvm/sys_regs.h
parentarm64: KVM: PMU: Inject UNDEF on non-privileged accesses (diff)
downloadlinux-dev-7b5b4df1a79954e0b208630fc63b16ec0231a516.tar.xz
linux-dev-7b5b4df1a79954e0b208630fc63b16ec0231a516.zip
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>
Diffstat (limited to '')
-rw-r--r--arch/arm64/kvm/sys_regs.h18
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)