linux-kernel - Re: [PATCH v5 03/23] iommu/vt-d: add a flag for pasid table bound status

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Date:   Sun, 13 May 2018 16:01:50 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>
Cc:     Rafael Wysocki <rafael.j.wysocki@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Jean Delvare <khali@...ux-fr.org>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH v5 03/23] iommu/vt-d: add a flag for pasid table bound
 status

Hi again,

On 05/12/2018 04:53 AM, Jacob Pan wrote:
> Adding a flag in device domain into to track whether a guest or
> user PASID table is bound to a device.
>
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>  include/linux/intel-iommu.h | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
> index 304afae..ddc7d79 100644
> --- a/include/linux/intel-iommu.h
> +++ b/include/linux/intel-iommu.h
> @@ -473,6 +473,7 @@ struct device_domain_info {
>  	u8 pri_enabled:1;
>  	u8 ats_supported:1;
>  	u8 ats_enabled:1;
> +	u8 pasid_table_bound:1;

Can you please add some comments here? So that, people can
understand the purpose for this bit exactly.

Best regards,
Lu Baolu

>  	u8 ats_qdep;
>  	u64 fault_mask;	/* selected IOMMU faults to be reported */
>  	struct device *dev; /* it's NULL for PCIe-to-PCI bridge */