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Subject[RFC v3 05/10] KVM: arm/arm64: Initialize the emulated EL1 physical timer
Date
Initialize the emulated EL1 physical timer with the default irq number.

Signed-off-by: Jintack Lim <jintack@cs.columbia.edu>
---
arch/arm/kvm/reset.c | 9 ++++++++-
arch/arm64/kvm/reset.c | 9 ++++++++-
include/kvm/arm_arch_timer.h | 3 ++-
virt/kvm/arm/arch_timer.c | 9 +++++++--
4 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/arch/arm/kvm/reset.c b/arch/arm/kvm/reset.c
index 4b5e802..1da8b2d 100644
--- a/arch/arm/kvm/reset.c
+++ b/arch/arm/kvm/reset.c
@@ -37,6 +37,11 @@
.usr_regs.ARM_cpsr = SVC_MODE | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT,
};

+static const struct kvm_irq_level cortexa_ptimer_irq = {
+ { .irq = 30 },
+ .level = 1,
+};
+
static const struct kvm_irq_level cortexa_vtimer_irq = {
{ .irq = 27 },
.level = 1,
@@ -58,6 +63,7 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
{
struct kvm_regs *reset_regs;
const struct kvm_irq_level *cpu_vtimer_irq;
+ const struct kvm_irq_level *cpu_ptimer_irq;

switch (vcpu->arch.target) {
case KVM_ARM_TARGET_CORTEX_A7:
@@ -65,6 +71,7 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
reset_regs = &cortexa_regs_reset;
vcpu->arch.midr = read_cpuid_id();
cpu_vtimer_irq = &cortexa_vtimer_irq;
+ cpu_ptimer_irq = &cortexa_ptimer_irq;
break;
default:
return -ENODEV;
@@ -77,5 +84,5 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
kvm_reset_coprocs(vcpu);

/* Reset arch_timer context */
- return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
+ return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq, cpu_ptimer_irq);
}
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index e95d4f6..d9e9697 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -46,6 +46,11 @@
COMPAT_PSR_I_BIT | COMPAT_PSR_F_BIT),
};

+static const struct kvm_irq_level default_ptimer_irq = {
+ .irq = 30,
+ .level = 1,
+};
+
static const struct kvm_irq_level default_vtimer_irq = {
.irq = 27,
.level = 1,
@@ -104,6 +109,7 @@ int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext)
int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
{
const struct kvm_irq_level *cpu_vtimer_irq;
+ const struct kvm_irq_level *cpu_ptimer_irq;
const struct kvm_regs *cpu_reset;

switch (vcpu->arch.target) {
@@ -117,6 +123,7 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
}

cpu_vtimer_irq = &default_vtimer_irq;
+ cpu_ptimer_irq = &default_ptimer_irq;
break;
}

@@ -130,5 +137,5 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
kvm_pmu_vcpu_reset(vcpu);

/* Reset timer */
- return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
+ return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq, cpu_ptimer_irq);
}
diff --git a/include/kvm/arm_arch_timer.h b/include/kvm/arm_arch_timer.h
index 6445a3d..f1d2fba0 100644
--- a/include/kvm/arm_arch_timer.h
+++ b/include/kvm/arm_arch_timer.h
@@ -58,7 +58,8 @@ struct arch_timer_cpu {
int kvm_timer_hyp_init(void);
int kvm_timer_enable(struct kvm_vcpu *vcpu);
int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
- const struct kvm_irq_level *irq);
+ const struct kvm_irq_level *virt_irq,
+ const struct kvm_irq_level *phys_irq);
void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu);
void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index c42bca5..ae38703 100644
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -327,9 +327,11 @@ void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu)
}

int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
- const struct kvm_irq_level *irq)
+ const struct kvm_irq_level *virt_irq,
+ const struct kvm_irq_level *phys_irq)
{
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
+ struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);

/*
* The vcpu timer irq number cannot be determined in
@@ -337,7 +339,8 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
* kvm_vcpu_set_target(). To handle this, we determine
* vcpu timer irq number when the vcpu is reset.
*/
- vtimer->irq.irq = irq->irq;
+ vtimer->irq.irq = virt_irq->irq;
+ ptimer->irq.irq = phys_irq->irq;

/*
* The bits in CNTV_CTL are architecturally reset to UNKNOWN for ARMv8
@@ -346,6 +349,7 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
* the ARMv7 architecture.
*/
vtimer->cnt_ctl = 0;
+ ptimer->cnt_ctl = 0;
kvm_timer_update_state(vcpu);

return 0;
@@ -369,6 +373,7 @@ void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu)

/* Synchronize cntvoff across all vtimers of a VM. */
update_vtimer_cntvoff(vcpu->kvm, kvm_phys_timer_read());
+ vcpu_ptimer(vcpu)->cntvoff = 0;

INIT_WORK(&timer->expired, kvm_timer_inject_irq_work);
hrtimer_init(&timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
--
1.9.1

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