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arm64: KVM: PMU: Inject UNDEF on non-privileged accesses 

access_pminten() and access_pmuserenr() can only be accessed when
the CPU is in a priviledged mode. If it is not, let's inject an
UNDEF exception.

Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2017-03-27 17:03:39 +01:00 committed by Christoffer Dall
parent 24d5950f6b
commit 9008c235cb
1 changed files with 6 additions and 2 deletions
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8
arch/arm64/kvm/sys_regs.c
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@ -709,8 +709,10 @@ static bool access_pminten(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
if (!kvm_arm_pmu_v3_ready(vcpu))
return trap_raz_wi(vcpu, p, r);
if (!vcpu_mode_priv(vcpu))
if (!vcpu_mode_priv(vcpu)) {
kvm_inject_undefined(vcpu);
return false;
}
if (p->is_write) {
u64 val = p->regval & mask;
@ -780,8 +782,10 @@ static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
return trap_raz_wi(vcpu, p, r);
if (p->is_write) {
if (!vcpu_mode_priv(vcpu))
if (!vcpu_mode_priv(vcpu)) {
kvm_inject_undefined(vcpu);
return false;
}
vcpu_sys_reg(vcpu, PMUSERENR_EL0) = p->regval
& ARMV8_PMU_USERENR_MASK;