Re: [PATCH v4 07/26] KVM: arm/arm64: GICv4: Add property field and per-VM predicate

[Christoffer Dall <cdall@linaro.org>]

On Fri, Oct 06, 2017 at 04:33:42PM +0100, Marc Zyngier wrote:
> Add a new has_gicv4 field in the global VGIC state that indicates
> whether the HW is GICv4 capable, as a per-VM predicate indicating
> if there is a possibility for a VM to support direct injection
> (the above being true and the VM having an ITS).
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>

> ---
>  include/kvm/arm_vgic.h           | 3 +++
>  virt/kvm/arm/vgic/vgic-mmio-v3.c | 5 +++++
>  virt/kvm/arm/vgic/vgic.h         | 2 ++
>  3 files changed, 10 insertions(+)
> 
> diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
> index 53f631bdec75..ba9fb450aa1b 100644
> --- a/include/kvm/arm_vgic.h
> +++ b/include/kvm/arm_vgic.h
> @@ -73,6 +73,9 @@ struct vgic_global {
>  	/* Only needed for the legacy KVM_CREATE_IRQCHIP */
>  	bool			can_emulate_gicv2;
>  
> +	/* Hardware has GICv4? */
> +	bool			has_gicv4;
> +
>  	/* GIC system register CPU interface */
>  	struct static_key_false gicv3_cpuif;
>  
> diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c
> index 408ef06638fc..f87fd17b2eb9 100644
> --- a/virt/kvm/arm/vgic/vgic-mmio-v3.c
> +++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c
> @@ -54,6 +54,11 @@ bool vgic_has_its(struct kvm *kvm)
>  	return dist->has_its;
>  }
>  
> +bool vgic_supports_direct_msis(struct kvm *kvm)
> +{
> +	return kvm_vgic_global_state.has_gicv4 && vgic_has_its(kvm);
> +}
> +
>  static unsigned long vgic_mmio_read_v3_misc(struct kvm_vcpu *vcpu,
>  					    gpa_t addr, unsigned int len)
>  {
> diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
> index 31b70326b966..e67ccb6a6250 100644
> --- a/virt/kvm/arm/vgic/vgic.h
> +++ b/virt/kvm/arm/vgic/vgic.h
> @@ -240,4 +240,6 @@ int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,
>  			 u32 devid, u32 eventid, struct vgic_irq **irq);
>  struct vgic_its *vgic_msi_to_its(struct kvm *kvm, struct kvm_msi *msi);
>  
> +bool vgic_supports_direct_msis(struct kvm *kvm);
> +
>  #endif
> -- 
> 2.14.1
>