From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
Add access handler which emulates writing and reading PMSWINC
register and add support for creating software increment event.
Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
arch/arm64/kvm/sys_regs.c | 18 +++++++++++++++++-
include/kvm/arm_pmu.h | 2 ++
virt/kvm/arm/pmu.c | 33 +++++++++++++++++++++++++++++++++
3 files changed, 52 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index b47cd0b..24d00a0 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -335,6 +335,11 @@ static bool access_pmu_regs(struct kvm_vcpu *vcpu,
vcpu_sys_reg(vcpu, PMOVSSET_EL0) &= ~val;
break;
}
+ case PMSWINC_EL0: {
+ val = *vcpu_reg(vcpu, p->Rt);
+ kvm_pmu_software_increment(vcpu, val);
+ break;
+ }
case PMCR_EL0: {
/* Only update writeable bits of PMCR */
val = vcpu_sys_reg(vcpu, r->reg);
@@ -364,6 +369,8 @@ static bool access_pmu_regs(struct kvm_vcpu *vcpu,
*vcpu_reg(vcpu, p->Rt) = val;
break;
}
+ case PMSWINC_EL0:
+ return read_zero(vcpu, p);
default:
*vcpu_reg(vcpu, p->Rt) = vcpu_sys_reg(vcpu, r->reg);
break;
@@ -576,7 +583,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
access_pmu_regs, reset_unknown, PMOVSCLR_EL0 },
/* PMSWINC_EL0 */
{ Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b100),
- trap_raz_wi },
+ access_pmu_regs, reset_unknown, PMSWINC_EL0 },
/* PMSELR_EL0 */
{ Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b101),
access_pmu_regs, reset_unknown, PMSELR_EL0 },
@@ -833,6 +840,11 @@ static bool access_pmu_cp15_regs(struct kvm_vcpu *vcpu,
vcpu_cp15(vcpu, c9_PMOVSSET) &= ~val;
break;
}
+ case c9_PMSWINC: {
+ val = *vcpu_reg(vcpu, p->Rt);
+ kvm_pmu_software_increment(vcpu, val);
+ break;
+ }
case c9_PMCR: {
/* Only update writeable bits of PMCR */
val = vcpu_cp15(vcpu, r->reg);
@@ -862,6 +874,8 @@ static bool access_pmu_cp15_regs(struct kvm_vcpu *vcpu,
*vcpu_reg(vcpu, p->Rt) = val;
break;
}
+ case c9_PMSWINC:
+ return read_zero(vcpu, p);
default:
*vcpu_reg(vcpu, p->Rt) = vcpu_cp15(vcpu, r->reg);
break;
@@ -907,6 +921,8 @@ static const struct sys_reg_desc cp15_regs[] = {
reset_unknown_cp15, c9_PMCNTENCLR },
{ Op1( 0), CRn( 9), CRm(12), Op2( 3), access_pmu_cp15_regs,
reset_unknown_cp15, c9_PMOVSCLR },
+ { Op1( 0), CRn( 9), CRm(12), Op2( 4), access_pmu_cp15_regs,
+ reset_unknown_cp15, c9_PMSWINC },
{ Op1( 0), CRn( 9), CRm(12), Op2( 5), access_pmu_cp15_regs,
reset_unknown_cp15, c9_PMSELR },
{ Op1( 0), CRn( 9), CRm(12), Op2( 6), access_pmu_cp15_regs,
diff --git a/include/kvm/arm_pmu.h b/include/kvm/arm_pmu.h
index 59e70af..1a27357 100644
--- a/include/kvm/arm_pmu.h
+++ b/include/kvm/arm_pmu.h
@@ -41,6 +41,7 @@ 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_software_increment(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);
#else
@@ -51,6 +52,7 @@ 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_software_increment(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) {}
#endif
diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c
index c6cdc4e..5f5a483 100644
--- a/virt/kvm/arm/pmu.c
+++ b/virt/kvm/arm/pmu.c
@@ -163,6 +163,35 @@ void kvm_pmu_disable_counter(struct kvm_vcpu *vcpu, unsigned long val)
}
/**
+ * kvm_pmu_software_increment - do software increment
+ * @vcpu: The vcpu pointer
+ * @val: the value guest writes to PMSWINC register
+ */
+void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, unsigned long val)
+{
+ int i;
+ unsigned int type, enable;
+
+ for (i = 0; i < 32; i++) {
+ if ((val >> i) & 0x1) {
+ if (!vcpu_mode_is_32bit(vcpu)) {
+ type = vcpu_sys_reg(vcpu, PMEVTYPER0_EL0 + i)
+ & ARMV8_EVTYPE_EVENT;
+ enable = vcpu_sys_reg(vcpu, PMCNTENSET_EL0);
+ if ((type == 0) && ((enable >> i) & 0x1))
+ vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i)++;
+ } else {
+ type = vcpu_cp15(vcpu, c14_PMEVTYPER0 + i)
+ & ARMV8_EVTYPE_EVENT;
+ enable = vcpu_cp15(vcpu, c9_PMCNTENSET);
+ if ((type == 0) && ((enable >> i) & 0x1))
+ vcpu_cp15(vcpu, c14_PMEVCNTR0 + i)++;
+ }
+ }
+ }
+}
+
+/**
* kvm_pmu_find_hw_event - find hardware event
* @pmu: The pmu pointer
* @event_select: The number of selected event type
@@ -239,6 +268,10 @@ void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, unsigned long data,
kvm_pmu_stop_counter(vcpu, select_idx);
kvm_pmu_set_evttyper(vcpu, select_idx, data);
+ /* For software increment event we don't need to create perf event */
+ if (new_eventsel == 0)
+ return;
+
config = kvm_pmu_find_hw_event(pmu, new_eventsel);
if (config != PERF_COUNT_HW_MAX) {
type = PERF_TYPE_HARDWARE;
--
2.0.4
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