On Mon, Jul 06, 2015 at 10:17:40AM +0800, shannon.zhao@xxxxxxxxxx wrote:
> From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
>
> Since the reset value of PMCCNTR_EL0 is UNKNOWN, use reset_unknown for
> its reset handler. Add access handler which emulates writing and reading
> PMCCNTR_EL0 register.
>
> Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> ---
> arch/arm64/kvm/sys_regs.c | 19 ++++++++++++++++++-
> 1 file changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index 2bcf1a0..29883df 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -375,6 +375,23 @@ static bool access_pmxevcntr(struct kvm_vcpu *vcpu,
> return true;
> }
>
> +static bool access_pmccntr(struct kvm_vcpu *vcpu,
> + const struct sys_reg_params *p,
> + const struct sys_reg_desc *r)
> +{
> + unsigned long val;
> +
> + if (p->is_write) {
> + val = *vcpu_reg(vcpu, p->Rt);
> + kvm_pmu_set_counter_value(vcpu, 31, val);
magic number? do we have some existing define we can use or can we add
one?
> + } else {
> + val = kvm_pmu_get_counter_value(vcpu, 31);
> + *vcpu_reg(vcpu, p->Rt) = val;
> + }
> +
> + return true;
> +}
> +
> /* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */
> #define DBG_BCR_BVR_WCR_WVR_EL1(n) \
> /* DBGBVRn_EL1 */ \
> @@ -590,7 +607,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
> access_pmceid, reset_pmceid, PMCEID1_EL0, },
> /* PMCCNTR_EL0 */
> { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b000),
> - trap_raz_wi },
> + access_pmccntr, reset_unknown, PMCCNTR_EL0 },
> /* PMXEVTYPER_EL0 */
> { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b001),
> access_pmxevtyper, reset_unknown, PMXEVTYPER_EL0 },
> --
> 2.1.0
>
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