[RFC PATCH v2 18/19] KVM: arm/arm64: Get rid of kvm_timer_flush_hwstate

Christoffer Dall
2017-07-17T14:27:02Z

Now when both the vtimer and the ptimer when using both the in-kernel
vgic emulation and a userspace IRQ chip are driven by the timer signals
and at the vcpu load/put boundaries, instead of recomputing the timer
state at every entry/exit to/from the guest, we can get entirely rid of
the flush hwstate function.

Signed-off-by: Christoffer Dall <cdall@linaro.org>
---
include/kvm/arm_arch_timer.h | 1 -
virt/kvm/arm/arch_timer.c | 24 ------------------------
virt/kvm/arm/arm.c | 1 -
3 files changed, 26 deletions(-)

diff --git a/include/kvm/arm_arch_timer.h b/include/kvm/arm_arch_timer.h
index 8e5ed54..af29563 100644
--- a/include/kvm/arm_arch_timer.h
+++ b/include/kvm/arm_arch_timer.h
@@ -61,7 +61,6 @@ int kvm_timer_hyp_init(void);
int kvm_timer_enable(struct kvm_vcpu *vcpu);
int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu);
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);
bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu);
void kvm_timer_update_run(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index aa18a5d..f92459a 100644
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -302,12 +302,6 @@ static void kvm_timer_update_state(struct kvm_vcpu *vcpu)
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);

- /*
- * If userspace modified the timer registers via SET_ONE_REG before
- * the vgic was initialized, we mustn't set the vtimer->irq.level value
- * because the guest would never see the interrupt. Instead wait
- * until we call this function from kvm_timer_flush_hwstate.
- */
if (unlikely(!timer->enabled))
return;

@@ -493,24 +487,6 @@ bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu)
ptimer->irq.level != plevel;
}

-/**
- * kvm_timer_flush_hwstate - prepare timers before running the vcpu
- * @vcpu: The vcpu pointer
- *
- * Check if the virtual timer has expired while we were running in the host,
- * and inject an interrupt if that was the case, making sure the timer is
- * masked or disabled on the host so that we keep executing. Also schedule a
- * software timer for the physical timer if it is enabled.
- */
-void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
-{
- struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
- struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
-
- if (unlikely(!timer->enabled))
- return;
-}
-
void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index aed3e5c..6322605 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -651,7 +651,6 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)

local_irq_disable();

- kvm_timer_flush_hwstate(vcpu);
kvm_vgic_flush_hwstate(vcpu);

/*
--
2.9.0