On Mon, Jul 06, 2015 at 10:17:42AM +0800, shannon.zhao@xxxxxxxxxx wrote:
> From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
>
> Since the reset value of PMINTENSET_EL1 and PMINTENCLR_EL1 is UNKNOWN,
> use reset_unknown for its reset handler. Add access handler which
> emulates writing and reading PMINTENSET_EL1 or PMINTENCLR_EL1 register.
> When writing to PMINTENSET_EL1, set the interrupt flag true. While
> writing to PMINTENCLR_EL1, set the interrupt flag false. This flag will
> be useful for counter overflow interrupt.
>
> Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> ---
> arch/arm64/kvm/sys_regs.c | 56 +++++++++++++++++++++++++++++++++++++++++++++--
> include/kvm/arm_pmu.h | 4 ++++
> virt/kvm/arm/pmu.c | 28 ++++++++++++++++++++++++
> 3 files changed, 86 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index c14ec8d..cbc07b8 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -444,6 +444,58 @@ static bool access_pmcntenclr(struct kvm_vcpu *vcpu,
> return true;
> }
>
> +/* PMINTENSET_EL1 accessor. */
> +static bool access_pmintenset(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);
> + if (!p->is_aarch32)
> + vcpu_sys_reg(vcpu, r->reg) |= val;
> + else
> + vcpu_cp15(vcpu, r->reg) |= val & 0xffffffffUL;
> +
> + kvm_pmu_enable_interrupt(vcpu, val);
> + } else {
> + if (!p->is_aarch32)
> + val = vcpu_sys_reg(vcpu, r->reg);
> + else
> + val = vcpu_cp15(vcpu, r->reg);
> + *vcpu_reg(vcpu, p->Rt) = val;
> + }
> +
> + return true;
> +}
> +
> +/* PMINTENCLR_EL1 accessor. */
> +static bool access_pmintenclr(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);
> + if (!p->is_aarch32)
> + vcpu_sys_reg(vcpu, r->reg) |= val;
> + else
> + vcpu_cp15(vcpu, r->reg) |= val & 0xffffffffUL;
> +
> + kvm_pmu_disable_interrupt(vcpu, val);
> + } else {
> + if (!p->is_aarch32)
> + val = vcpu_sys_reg(vcpu, r->reg);
> + else
> + val = vcpu_cp15(vcpu, r->reg);
> + *vcpu_reg(vcpu, p->Rt) = val;
> + }
Same comments as in the previous patch, but now I realize what you're
doing with the set/clear registers. These are not separate pieces of
state, but a single register, which are just accessed with two
interfaces, for set/clear patterns.
> +
> + 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 */ \
> @@ -595,10 +647,10 @@ static const struct sys_reg_desc sys_reg_descs[] = {
>
> /* PMINTENSET_EL1 */
> { Op0(0b11), Op1(0b000), CRn(0b1001), CRm(0b1110), Op2(0b001),
> - trap_raz_wi },
> + access_pmintenset, reset_unknown, PMINTENSET_EL1 },
> /* PMINTENCLR_EL1 */
> { Op0(0b11), Op1(0b000), CRn(0b1001), CRm(0b1110), Op2(0b010),
> - trap_raz_wi },
> + access_pmintenclr, reset_unknown, PMINTENCLR_EL1 },
>
> /* MAIR_EL1 */
> { Op0(0b11), Op1(0b000), CRn(0b1010), CRm(0b0010), Op2(0b000),
> diff --git a/include/kvm/arm_pmu.h b/include/kvm/arm_pmu.h
> index 2cfd9be..dee8356 100644
> --- a/include/kvm/arm_pmu.h
> +++ b/include/kvm/arm_pmu.h
> @@ -51,6 +51,8 @@ unsigned long kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu,
> unsigned long select_idx);
> void kvm_pmu_disable_counter(struct kvm_vcpu *vcpu, unsigned long val);
> void kvm_pmu_enable_counter(struct kvm_vcpu *vcpu, unsigned long val);
> +void kvm_pmu_disable_interrupt(struct kvm_vcpu *vcpu, unsigned long val);
> +void kvm_pmu_enable_interrupt(struct kvm_vcpu *vcpu, unsigned long val);
> void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, unsigned long data,
> unsigned long select_idx);
> void kvm_pmu_init(struct kvm_vcpu *vcpu);
> @@ -65,6 +67,8 @@ unsigned long kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu,
> }
> void kvm_pmu_disable_counter(struct kvm_vcpu *vcpu, unsigned long val) {}
> void kvm_pmu_enable_counter(struct kvm_vcpu *vcpu, unsigned long val) {}
> +void kvm_pmu_disable_interrupt(struct kvm_vcpu *vcpu, unsigned long val) {}
> +void kvm_pmu_enable_interrupt(struct kvm_vcpu *vcpu, unsigned long val) {}
> void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, unsigned long data,
> unsigned long select_idx) {}
> static inline void kvm_pmu_init(struct kvm_vcpu *vcpu) {}
> diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c
> index cf59998..7023ad5 100644
> --- a/virt/kvm/arm/pmu.c
> +++ b/virt/kvm/arm/pmu.c
> @@ -175,6 +175,34 @@ void kvm_pmu_disable_counter(struct kvm_vcpu *vcpu, unsigned long val)
> }
>
> /**
> + * kvm_pmu_enable_interrupt - enable selected PMU counter interrupt
> + * @vcpu: The vcpu pointer
> + * @val: the value guest writes to PMINTENSET_EL0 register
> + */
> +void kvm_pmu_enable_interrupt(struct kvm_vcpu *vcpu, unsigned long val)
> +{
> + int select_idx = find_first_bit(&val, 32);
also same as before.
> + struct kvm_pmu *pmu = &vcpu->arch.pmu;
> + struct kvm_pmc *pmc = &pmu->pmc[select_idx];
> +
> + pmc->interrupt = true;
ah, so this was interrupts enabled, I think this is better called
interrupt_enabled on the struct.
Thanks,
-Christoffer
> +}
> +
> +/**
> + * kvm_pmu_disable_interrupt - disable selected PMU counter interrupt
> + * @vcpu: The vcpu pointer
> + * @val: the value guest writes to PMINTENCLR_EL0 register
> + */
> +void kvm_pmu_disable_interrupt(struct kvm_vcpu *vcpu, unsigned long val)
> +{
> + int select_idx = find_first_bit(&val, 32);
> + struct kvm_pmu *pmu = &vcpu->arch.pmu;
> + struct kvm_pmc *pmc = &pmu->pmc[select_idx];
> +
> + pmc->interrupt = false;
> +}
> +
> +/**
> * kvm_pmu_find_hw_event - find hardware event
> * @pmu: The pmu pointer
> * @event_select: The number of selected event type
> --
> 2.1.0
>
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