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KVM: arm/arm64: Get rid of kvm_timer_flush_hwstate 

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>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Christoffer Dall 2017-06-20 07:56:20 -07:00 committed by Christoffer Dall
parent bbdd52cfcb
commit 7e90c8e570
3 changed files with 0 additions and 26 deletions
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1
include/kvm/arm_arch_timer.h
View File

@ -66,7 +66,6 @@ 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);

24
virt/kvm/arm/arch_timer.c
View File

@ -305,12 +305,6 @@ 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;
@ -489,24 +483,6 @@ 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;

1
virt/kvm/arm/arm.c
View File

@ -656,7 +656,6 @@ 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);
/*