Re: [Xen-devel] [PATCH v3 31/39] ARM: new VGIC: Provide system register emulation stub

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Wed, 21 Mar 2018, Andre Przywara wrote:
> The Xen arch code traps system registers writes from the guest and will
> relay anything GIC related to the VGIC.
> Since this affects only GICv3 (which we don't yet emulate), provide a
> stub implementation of vgic_emulate() for now.
> 
> Signed-off-by: Andre Przywara <andre.przywara@xxxxxxxxxx>
> Acked-by: Julien Grall <julien.grall@xxxxxxx>

Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> ---
>  xen/arch/arm/vgic/vgic.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/xen/arch/arm/vgic/vgic.c b/xen/arch/arm/vgic/vgic.c
> index 79c6a5553d..ffab0b2635 100644
> --- a/xen/arch/arm/vgic/vgic.c
> +++ b/xen/arch/arm/vgic/vgic.c
> @@ -814,6 +814,13 @@ struct irq_desc *vgic_get_hw_irq_desc(struct domain *d, 
> struct vcpu *v,
>      return desc;
>  }
>  
> +bool vgic_emulate(struct cpu_user_regs *regs, union hsr hsr)
> +{
> +    ASSERT(current->domain->arch.vgic.version == GIC_V3);
> +
> +    return false;
> +}
> +
>  /*
>   * was:
>   *      int kvm_vgic_map_phys_irq(struct vcpu *vcpu, u32 virt_irq, u32 
> phys_irq)
> -- 
> 2.14.1
> 

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