linux-kernel - Re: [v8 3/9] iommu, x86: Implement irq_set_vcpu_affinity for intel_ir

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Message-ID: <alpine.DEB.2.11.1506021501070.3786@nanos>
Date:	Tue, 2 Jun 2015 15:59:09 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Feng Wu <feng.wu@...el.com>
cc:	joro@...tes.org, dwmw2@...radead.org, jiang.liu@...ux.intel.com,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [v8 3/9] iommu, x86: Implement irq_set_vcpu_affinity for
 intel_ir_chip

On Wed, 27 May 2015, Feng Wu wrote:
> +	/* stop posting interrupts, back to remapping mode */
> +	if (!vcpu_info) {
> +		modify_irte(&ir_data->irq_2_iommu, &ir_data->irte_entry);
> +	} else {
> +		vcpu_pi_info = (struct vcpu_data *)vcpu_info;
> +
> +		/*
> +		 * "ir_data->irte_entry" saves the remapped format of IRTE,
> +		 * which being a cached irte is still updated when setting
> +		 * the affinity even when we are in posted mode. So this make

s/make/makes/

> +		 * it possible to switch back to remapped mode from posted mode,
> +		 * we can just set "ir_data->irte_entry" to hardware for that
> +		 * purpose. Here we store the posted format of IRTE in another
> +		 * new member "ir_data->irte_pi_entry" to not corrupt

Remove the 'another new member' please. That member is not longer new
once that patch is applied.

Now there is another question. Are we actually using that pi_entry
cached value for anything else than this code here? If not, we can do
this on the stack and avoid the extra storage in ir_data.

Thanks,

	tglx
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