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

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Date:   Fri, 30 Aug 2019 09:31:30 +0200
From:   Christoph Hellwig <hch@....de>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Joerg Roedel <joro@...tes.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Christoph Hellwig <hch@....de>, 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

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.
Please move the untrusted flag to struct device.