From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
Since the reset value of PMXEVTYPER_EL0 is UNKNOWN, use reset_unknown
for its reset handler. Add access handler which emulates writing and
reading PMXEVTYPER_EL0 register. When writing to PMXEVTYPER_EL0, call
kvm_pmu_set_counter_event_type create a perf event for the selected
event type.
Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
arch/arm64/kvm/sys_regs.c | 27 ++++++++++++++++++++++++++-
1 file changed, 26 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 1df9ef3..b4f8dd9 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -331,6 +331,31 @@ static bool access_pmceid(struct kvm_vcpu *vcpu,
}
}
+/* PMXEVTYPER_EL0 accessor. */
+static bool access_pmxevtyper(struct kvm_vcpu *vcpu,
+ const struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ unsigned long val;
+
+ if (p->is_write) {
+ if (!p->is_aarch32)
+ vcpu_sys_reg(vcpu, r->reg) = *vcpu_reg(vcpu, p->Rt);
+ else
+ vcpu_cp15(vcpu, r->reg) = *vcpu_reg(vcpu, p->Rt);
+ kvm_pmu_set_counter_event_type(vcpu, *vcpu_reg(vcpu, p->Rt),
+ vcpu_sys_reg(vcpu, PMSELR_EL0));
+ } 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;
+}
+
/* 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 */ \
@@ -549,7 +574,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
trap_raz_wi },
/* PMXEVTYPER_EL0 */
{ Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b001),
- trap_raz_wi },
+ access_pmxevtyper, reset_unknown, PMXEVTYPER_EL0 },
/* PMXEVCNTR_EL0 */
{ Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b010),
trap_raz_wi },
--
2.1.0
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