linux-kernel - Re: [PATCH v8 3/7] swiotlb: Zero out bounce buffer for untrusted device

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Message-ID: <a5edd268-5ba7-a8b6-d883-f4761e52fdff@linux.intel.com>
Date:   Mon, 2 Sep 2019 09:58:27 +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>,
        Bjorn Helgaas <bhelgaas@...gle.com>, ashok.raj@...el.com,
        jacob.jun.pan@...el.com, alan.cox@...el.com, kevin.tian@...el.com,
        mika.westerberg@...ux.intel.com, Ingo Molnar <mingo@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        pengfei.xu@...el.com,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Jonathan Corbet <corbet@....net>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 3/7] swiotlb: Zero out bounce buffer for untrusted
 device

Hi Christoph,

On 8/30/19 3:31 PM, Christoph Hellwig wrote:
> On Fri, Aug 30, 2019 at 03:17:14PM +0800, Lu Baolu wrote:
>> +#include <linux/pci.h>
> 
>> +	if (dev_is_untrusted(hwdev) && zero_size)
>> +		memset(zero_addr, 0, zero_size);
> 
> As said before swiotlb must not grow pci dependencies like this.

I understand your concern. I will try to remove this dependency in the
next version.

> Please move the untrusted flag to struct device.

The untrusted flag is introduced in another series. I agree that we
could consider to move it to struct device, but I think making it
in a separated patch looks better.

Best regards,
Lu Baolu