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arm/arm64: KVM: Fix ordering of timer/GIC on guest entry

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As we now inject the timer interrupt when we're about to enter
the guest, it makes a lot more sense to make sure this happens
before the vgic code queues the pending interrupts.

Otherwise, we get the interrupt on the following exit, which is
not great for latency (and leads to all kind of bizarre issues
when using with active interrupts at the HW level).

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Marc Zyngier 2015-06-05 09:33:28 +01:00
parent 48f8bd5775
commit 9a99d05070
1 changed files with 3 additions and 4 deletions
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7
arch/arm/kvm/arm.c
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@ -523,8 +523,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
if (vcpu->arch.pause)
vcpu_pause(vcpu);
kvm_vgic_flush_hwstate(vcpu);
kvm_timer_flush_hwstate(vcpu);
kvm_vgic_flush_hwstate(vcpu);
preempt_disable();
local_irq_disable();
@ -540,8 +540,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) {
local_irq_enable();
preempt_enable();
kvm_timer_sync_hwstate(vcpu);
kvm_vgic_sync_hwstate(vcpu);
kvm_timer_sync_hwstate(vcpu);
continue;
}
@ -587,9 +587,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
trace_kvm_exit(kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
preempt_enable();
kvm_timer_sync_hwstate(vcpu);
kvm_vgic_sync_hwstate(vcpu);
kvm_timer_sync_hwstate(vcpu);
ret = handle_exit(vcpu, run, ret);
}