Re: [PATCH v4 19/28] x86/vioapic: extend vioapic_get_vector() to support remapping format RTE

["Roger Pau Monné" <roger.pau@citrix.com>]

On Fri, Nov 17, 2017 at 02:22:26PM +0800, Chao Gao wrote:
> When IOAPIC RTE is in remapping format, it doesn't contain the vector of
> interrupt. For this case, the RTE contains an index of interrupt remapping
> table where the vector of interrupt is stored. This patchs gets the vector
> through a vIOMMU interface.

I think this should be merged with the previous patch.

> Signed-off-by: Chao Gao <chao.gao@intel.com>
> Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
> ---
>  xen/arch/x86/hvm/vioapic.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/xen/arch/x86/hvm/vioapic.c b/xen/arch/x86/hvm/vioapic.c
> index 0f20e3f..8b34b21 100644
> --- a/xen/arch/x86/hvm/vioapic.c
> +++ b/xen/arch/x86/hvm/vioapic.c
> @@ -560,11 +560,23 @@ int vioapic_get_vector(const struct domain *d, unsigned int gsi)
>  {
>      unsigned int pin;
>      const struct hvm_vioapic *vioapic = gsi_vioapic(d, gsi, &pin);
> +    struct arch_irq_remapping_request request;
>  
>      if ( !vioapic )
>          return -EINVAL;
>  
> -    return vioapic->redirtbl[pin].fields.vector;
> +    irq_request_ioapic_fill(&request, vioapic->id, vioapic->redirtbl[pin].bits);
> +    if ( viommu_check_irq_remapping(vioapic->domain, &request) )
> +    {
> +        struct arch_irq_remapping_info info;
> +
> +        return unlikely(viommu_get_irq_info(vioapic->domain, &request, &info))
> +                   ? : info.vector;
> +    }
> +    else
> +    {
> +        return vioapic->redirtbl[pin].fields.vector;
> +    }

Unneeded braces.

Thanks, Roger.

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