From: Christoph Hellwig <hch@lst.de>
To: Lu Baolu <baolu.lu@linux.intel.com>
Cc: Christoph Hellwig <hch@lst.de>,
David Woodhouse <dwmw2@infradead.org>,
Joerg Roedel <joro@8bytes.org>,
ashok.raj@intel.com, jacob.jun.pan@intel.com, alan.cox@intel.com,
kevin.tian@intel.com, mika.westerberg@linux.intel.com,
pengfei.xu@intel.com,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Robin Murphy <robin.murphy@arm.com>,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 02/10] swiotlb: Factor out slot allocation and free
Date: Fri, 26 Apr 2019 17:04:33 +0200 [thread overview]
Message-ID: <20190426150433.GA19930@lst.de> (raw)
In-Reply-To: <a189444b-15c9-8069-901d-8cdf9af7fc3c@linux.intel.com>
On Thu, Apr 25, 2019 at 10:07:19AM +0800, Lu Baolu wrote:
> This is not VT-d specific. It's just how generic IOMMU works.
>
> Normally, IOMMU works in paging mode. So if a driver issues DMA with
> IOVA 0xAAAA0123, IOMMU can remap it with a physical address 0xBBBB0123.
> But we should never expect IOMMU to remap 0xAAAA0123 with physical
> address of 0xBBBB0000. That's the reason why I said that IOMMU will not
> work there.
Well, with the iommu it doesn't happen. With swiotlb it obviosuly
can happen, so drivers are fine with it. Why would that suddenly
become an issue when swiotlb is called from the iommu code?
next prev parent reply other threads:[~2019-04-26 15:04 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-21 1:17 [PATCH v3 00/10] iommu: Bounce page for untrusted devices Lu Baolu
2019-04-21 1:17 ` [PATCH v3 01/10] iommu: Add helper to get minimal page size of domain Lu Baolu
2019-04-29 10:55 ` Robin Murphy
2019-04-30 0:40 ` Lu Baolu
2019-04-21 1:17 ` [PATCH v3 02/10] swiotlb: Factor out slot allocation and free Lu Baolu
2019-04-22 16:45 ` Christoph Hellwig
2019-04-23 1:58 ` Lu Baolu
2019-04-23 6:12 ` Christoph Hellwig
2019-04-23 7:32 ` Lu Baolu
2019-04-24 14:45 ` Christoph Hellwig
2019-04-25 2:07 ` Lu Baolu
2019-04-26 15:04 ` Christoph Hellwig [this message]
2019-04-29 5:10 ` Lu Baolu
2019-04-29 11:06 ` Robin Murphy
2019-04-29 11:44 ` Christoph Hellwig
2019-05-06 1:54 ` Lu Baolu
2019-05-13 7:05 ` Christoph Hellwig
2019-05-16 1:53 ` Lu Baolu
2019-04-30 2:02 ` Lu Baolu
2019-04-30 9:53 ` Robin Murphy
2019-05-02 1:47 ` Lu Baolu
2019-04-21 1:17 ` [PATCH v3 03/10] swiotlb: Limit tlb address range inside slot pool Lu Baolu
2019-04-21 1:17 ` [PATCH v3 04/10] swiotlb: Extend swiotlb to support page bounce Lu Baolu
2019-04-21 1:17 ` [PATCH v3 05/10] iommu: Add bounce page APIs Lu Baolu
2019-04-21 1:17 ` [PATCH v3 06/10] iommu/vt-d: Add trace events for domain map/unmap Lu Baolu
2019-04-21 1:17 ` [PATCH v3 07/10] iommu/vt-d: Keep swiotlb on if bounce page is necessary Lu Baolu
2019-04-22 16:47 ` Christoph Hellwig
2019-04-23 2:00 ` Lu Baolu
2019-04-21 1:17 ` [PATCH v3 08/10] iommu/vt-d: Check whether device requires bounce buffer Lu Baolu
2019-04-22 16:47 ` Christoph Hellwig
2019-04-23 2:03 ` Lu Baolu
2019-04-23 6:08 ` Christoph Hellwig
2019-04-23 7:35 ` Lu Baolu
2019-04-24 18:27 ` Konrad Rzeszutek Wilk
2019-04-21 1:17 ` [PATCH v3 09/10] iommu/vt-d: Add dma sync ops for untrusted devices Lu Baolu
2019-04-21 1:17 ` [PATCH v3 10/10] iommu/vt-d: Use bounce buffer " Lu Baolu
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