linux-kernel - Re: [PATCH v3 07/10] iommu/vt-d: Keep swiotlb on if bounce page is necessary

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Date:   Tue, 23 Apr 2019 10:00:32 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Christoph Hellwig <hch@....de>
Cc:     baolu.lu@...ux.intel.com, David Woodhouse <dwmw2@...radead.org>,
        Joerg Roedel <joro@...tes.org>, ashok.raj@...el.com,
        jacob.jun.pan@...el.com, alan.cox@...el.com, kevin.tian@...el.com,
        mika.westerberg@...ux.intel.com, pengfei.xu@...el.com,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...el.com>
Subject: Re: [PATCH v3 07/10] iommu/vt-d: Keep swiotlb on if bounce page is
 necessary

Hi,

On 4/23/19 12:47 AM, Christoph Hellwig wrote:
> On Sun, Apr 21, 2019 at 09:17:16AM +0800, Lu Baolu wrote:
>> +static inline bool platform_has_untrusted_device(void)
>>   {
>> +	bool has_untrusted_device = false;
>>   	struct pci_dev *pdev = NULL;
>>   
>>   	for_each_pci_dev(pdev) {
>>   		if (pdev->untrusted) {
>> +			has_untrusted_device = true;
>>   			break;
>>   		}
>>   	}
>>   
>> +	return has_untrusted_device;
> 
> This shouldn't really be in the intel-iommu driver, should it?
> This probably should be something like pci_has_untrusted_devices
> and be moved to the PCI code.
> 

Fair enough.

Best regards,
Lu Baolu