Re: [Xen-devel] [PATCH v8 09/13] xen/arm: second irq injection while the first irq is still inflight

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 05/23/2014 03:50 PM, Stefano Stabellini wrote:
> The following change works:
> 
> diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
> index 33141e3..2a8456f 100644
> --- a/xen/arch/arm/domain.c
> +++ b/xen/arch/arm/domain.c
> @@ -644,6 +644,8 @@ int arch_set_info_guest(
>      else
>          set_bit(_VPF_down, &v->pause_flags);
>  
> +    vgic_vcpu_inject_irq(v, v->domain->arch.evtchn_irq);
> +

This is racy, we may not clear the _VPF_down bit in this function
(depending if VGCF_online is set or not).

Hopefully for ARM, libxc is setting this flags by default but it's not
always true.

>      return 0;
>  }
>  
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index af5cd6c..d597f63 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -1087,6 +1087,8 @@ int construct_dom0(struct domain *d)
>      }
>  #endif
>  
> +    vgic_vcpu_inject_irq(v, v->domain->arch.evtchn_irq);
> +

I think it needs a comment in code.

Regards,

-- 
Julien Grall

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