Re: [PATCH] interrupt remapping: Disallow interrupt remapping ifnot all ioapic under interrupt remapping

[Suresh Siddha]

On Mon, 2009-09-07 at 07:58 -0700, Song, Youquan wrote:
> Current kernel enable interrupt remapping only when all the vt-d unit support
> interrupt remapping. So it is reasonable we should also disallow enabling
> intr-remapping if there any io-apics that are not listed under vt-d units. 
> Otherwise we can run into issues.
> 
> Acked-by: Suresh Siddha <suresh.b.siddha@xxxxxxxxx> 
> Signed-off-by: Youquan Song <youquan.song@xxxxxxxxx>
> ---
> 
> diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
> index 7b287cb..a8a4383 100644
> --- a/drivers/pci/dmar.c
> +++ b/drivers/pci/dmar.c
> @@ -570,9 +570,6 @@ int __init dmar_table_init(void)
>  		printk(KERN_INFO PREFIX "No ATSR found\n");
>  #endif
>  
> -#ifdef CONFIG_INTR_REMAP
> -	parse_ioapics_under_ir();
> -#endif
>  	return 0;
>  }
>  
> diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
> index 4f5b871..ebfa47b 100644
> --- a/drivers/pci/intr_remapping.c
> +++ b/drivers/pci/intr_remapping.c
> @@ -626,6 +626,11 @@ int __init enable_intr_remapping(int eim)
>  	struct dmar_drhd_unit *drhd;
>  	int setup = 0;
>  
> +	if (parse_ioapics_under_ir() != 1) {
> +		printk(KERN_INFO "Not enable interrupt remapping\n");
> +		return -1;
> +	}
> +
>  	for_each_drhd_unit(drhd) {
>  		struct intel_iommu *iommu = drhd->iommu;
>  

David, Can you also pick this up please?

thanks,
suresh

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