linux-kernel - Re: [RFC PATCH v6 2/4] iommu/vt-d: don's issue devTLB flush request when device is disconnected

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Date: Sun, 24 Dec 2023 11:32:25 +0100
From: Lukas Wunner <lukas@...ner.de>
To: Ethan Zhao <haifeng.zhao@...ux.intel.com>
Cc: bhelgaas@...gle.com, baolu.lu@...ux.intel.com, dwmw2@...radead.org,
	will@...nel.org, robin.murphy@....com, linux-pci@...r.kernel.org,
	iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v6 2/4] iommu/vt-d: don's issue devTLB flush request
 when device is disconnected

On Sun, Dec 24, 2023 at 12:06:55AM -0500, Ethan Zhao wrote:
> --- a/drivers/iommu/intel/pasid.c
> +++ b/drivers/iommu/intel/pasid.c
> @@ -481,6 +481,9 @@ devtlb_invalidation_with_pasid(struct intel_iommu *iommu,
>  	if (!info || !info->ats_enabled)
>  		return;
>  
> +	if (pci_dev_is_disconnected(to_pci_dev(dev)))
> +		return;
> +
>  	sid = info->bus << 8 | info->devfn;
>  	qdep = info->ats_qdep;
>  	pfsid = info->pfsid;

Do you even need this or is patch [4/4] sufficient?
Is there a benefit to the hunk above on top of patch [4/4]?

Thanks,

Lukas