Subject: [PATCH 3/5] arm/arm64: KVM: Add (new) vgic_initialized macro

From: [email-masked] (Eric Auger)
Date: Wed, 10 Dec 2014 11:27:34 +0100

On 12/09/2014 04:44 PM, Christoffer Dall wrote:
> Some code paths will need to check to see if the internal state of the
> vgic has been initialized (such as when creating new VCPUs), so
> introduce such a macro that checks the nr_cpus field which is set when
> the vgic has been initialized.
> 
> Also set nr_cpus = 0 in kvm_vgic_destroy, because the error path in
> vgic_init() will call this function, and code should never errornously
> assume the vgic to be properly initialized after an error.
> 
> Signed-off-by: Christoffer Dall <[email-masked]>
> ---
>  include/kvm/arm_vgic.h | 6 ++++++
>  virt/kvm/arm/vgic.c    | 1 +
>  2 files changed, 7 insertions(+)
> 
> diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
> index 3e262b9..ac4888d 100644
> --- a/include/kvm/arm_vgic.h
> +++ b/include/kvm/arm_vgic.h
> @@ -287,6 +287,7 @@ bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
>  		      struct kvm_exit_mmio *mmio);
>  
>  #define irqchip_in_kernel(k)	(!!((k)->arch.vgic.in_kernel))
> +#define vgic_initialized(k)	(!!((k)->arch.vgic.nr_cpus))
>  #define vgic_ready(k)		((k)->arch.vgic.ready)
>  
>  int vgic_v2_probe(struct device_node *vgic_node,
> @@ -369,6 +370,11 @@ static inline int irqchip_in_kernel(struct kvm *kvm)
>  	return 0;
>  }
>  
> +static inline bool vgic_initialized(struct kvm *kvm)
> +{
> +	return true;
> +}
> +
>  static inline bool vgic_ready(struct kvm *kvm)
>  {
>  	return true;
> diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
> index 6293349..c98cc6b 100644
> --- a/virt/kvm/arm/vgic.c
> +++ b/virt/kvm/arm/vgic.c
> @@ -1774,6 +1774,7 @@ void kvm_vgic_destroy(struct kvm *kvm)
>  	dist->irq_spi_cpu = NULL;
>  	dist->irq_spi_target = NULL;
>  	dist->irq_pending_on_cpu = NULL;
> +	dist->nr_cpus = 0;
Reviewed-by: Eric Auger <[email-masked]>
we could use that new vgic_initialized at the entry of vgic_init instead
of testing dist->nr_cpus, hence introducing one user.

Eric
>  }
>  /*