Commit e0443230 authored by Marc Zyngier's avatar Marc Zyngier Committed by Christoffer Dall

arm64: KVM: PMU: Inject UNDEF on read access to PMSWINC_EL0

PMSWINC_EL0 is a WO register, so let's UNDEF when reading from it
(in the highly hypothetical case where this doesn't UNDEF at EL1).
Reviewed-by: default avatarChristoffer Dall <cdall@linaro.org>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent 7b5b4df1
......@@ -772,16 +772,15 @@ static bool access_pmswinc(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
if (!kvm_arm_pmu_v3_ready(vcpu))
return trap_raz_wi(vcpu, p, r);
if (!p->is_write)
return read_from_write_only(vcpu, p);
if (pmu_write_swinc_el0_disabled(vcpu))
return false;
if (p->is_write) {
mask = kvm_pmu_valid_counter_mask(vcpu);
kvm_pmu_software_increment(vcpu, p->regval & mask);
return true;
}
return false;
}
static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
......
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