Re: [PATCH v3 04/20] KVM: arm/arm64: Guard kvm_vgic_map_is_active against !vgic_initialized

Marc Zyngier
2017-10-09T16:22:13Z

On 23/09/17 01:41, Christoffer Dall wrote:
> If the vgic is not initialized, don't try to grab its spinlocks or
> traverse its data structures.
>
> This is important because we soon have to start considering the active
> state of a virtual interrupts when doing vcpu_load, which may happen
> early on before the vgic is initialized.
>
> Signed-off-by: Christoffer Dall <cdall@linaro.org>
> ---
> virt/kvm/arm/vgic/vgic.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
> index fed717e..e1f7dbc 100644
> --- a/virt/kvm/arm/vgic/vgic.c
> +++ b/virt/kvm/arm/vgic/vgic.c
> @@ -777,6 +777,9 @@ bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int virt_irq)
> struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, virt_irq);
> bool map_is_active;
>
> + if (!vgic_initialized(vcpu->kvm))
> + return false;
> +
> spin_lock(&irq->irq_lock);
> map_is_active = irq->hw && irq->active;
> spin_unlock(&irq->irq_lock);
>

Acked-by: Marc Zyngier <marc.zyngier@arm.com>

M.
--
Jazz is not dead. It just smells funny...