On 15/12/15 08:49, Shannon Zhao wrote: > From: Shannon Zhao <shannon.zhao@xxxxxxxxxx> > > These kind of registers include PMEVTYPERn, PMCCFILTR and PMXEVTYPER > which is mapped to PMEVTYPERn or PMCCFILTR. > > The access handler translates all aarch32 register offsets to aarch64 > ones and uses vcpu_sys_reg() to access their values to avoid taking care > of big endian. > > When writing to these registers, create a perf_event for the selected > event type. > > Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx> > --- > arch/arm64/kvm/sys_regs.c | 154 +++++++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 152 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c > index e043224..c52ff15 100644 > --- a/arch/arm64/kvm/sys_regs.c > +++ b/arch/arm64/kvm/sys_regs.c > @@ -504,6 +504,68 @@ static bool access_pmceid(struct kvm_vcpu *vcpu, struct sys_reg_params *p, > return true; > } > > +static inline bool pmu_counter_idx_valid(struct kvm_vcpu *vcpu, u64 idx) > +{ > + u64 pmcr, val; > + > + pmcr = vcpu_sys_reg(vcpu, PMCR_EL0); > + val = (pmcr >> ARMV8_PMCR_N_SHIFT) & ARMV8_PMCR_N_MASK; > + if (idx >= val && idx != ARMV8_CYCLE_IDX) > + return false; > + > + return true; > +} > + > +static bool access_pmu_evtyper(struct kvm_vcpu *vcpu, struct sys_reg_params *p, > + const struct sys_reg_desc *r) > +{ > + u64 idx, reg; > + > + if (r->CRn == 9) { > + /* PMXEVTYPER_EL0 */ > + reg = 0; > + } else { > + if (!p->is_aarch32) { > + /* PMEVTYPERn_EL0 or PMCCFILTR_EL0 */ > + reg = r->reg; > + } else { > + if (r->CRn == 14 && r->CRm == 15 && r->Op2 == 7) { > + reg = PMCCFILTR_EL0; > + } else { > + reg = ((r->CRm & 3) << 3) & (r->Op2 & 7); > + reg += PMEVTYPER0_EL0; > + } > + } > + } > + > + switch (reg) { > + case PMEVTYPER0_EL0 ... PMEVTYPER30_EL0: > + idx = reg - PMEVTYPER0_EL0; > + break; > + case PMCCFILTR_EL0: > + idx = ARMV8_CYCLE_IDX; > + break; > + default: > + /* PMXEVTYPER_EL0 */ > + idx = vcpu_sys_reg(vcpu, PMSELR_EL0) & ARMV8_COUNTER_MASK; > + if (!pmu_counter_idx_valid(vcpu, idx)) > + return true; Shouldn't you check the validity of the index in the first case as well? Thanks, M. -- Jazz is not dead. It just smells funny... -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html