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Re: [RFC PATCH v3 3/6] swiotlb: Use restricted DMA pool if available
- To: Claire Chang <tientzu@xxxxxxxxxxxx>, robh+dt@xxxxxxxxxx, mpe@xxxxxxxxxxxxxx, benh@xxxxxxxxxxxxxxxxxxx, paulus@xxxxxxxxx, joro@xxxxxxxxxx, will@xxxxxxxxxx, frowand.list@xxxxxxxxx, konrad.wilk@xxxxxxxxxx, boris.ostrovsky@xxxxxxxxxx, jgross@xxxxxxxx, sstabellini@xxxxxxxxxx, hch@xxxxxx, m.szyprowski@xxxxxxxxxxx, robin.murphy@xxxxxxx
- From: Florian Fainelli <f.fainelli@xxxxxxxxx>
- Date: Tue, 12 Jan 2021 15:39:23 -0800
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- Cc: grant.likely@xxxxxxx, xypron.glpk@xxxxxx, treding@xxxxxxxxxx, mingo@xxxxxxxxxx, bauerman@xxxxxxxxxxxxx, peterz@xxxxxxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, saravanak@xxxxxxxxxx, rafael.j.wysocki@xxxxxxxxx, heikki.krogerus@xxxxxxxxxxxxxxx, andriy.shevchenko@xxxxxxxxxxxxxxx, rdunlap@xxxxxxxxxxxxx, dan.j.williams@xxxxxxxxx, bgolaszewski@xxxxxxxxxxxx, devicetree@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, tfiga@xxxxxxxxxxxx, drinkcat@xxxxxxxxxxxx
- Delivery-date: Tue, 12 Jan 2021 23:39:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 1/5/21 7:41 PM, Claire Chang wrote:
> Regardless of swiotlb setting, the restricted DMA pool is preferred if
> available.
>
> The restricted DMA pools provide a basic level of protection against
> the DMA overwriting buffer contents at unexpected times. However, to
> protect against general data leakage and system memory corruption, the
> system needs to provide a way to restrict the DMA to a predefined memory
> region.
>
> Signed-off-by: Claire Chang <tientzu@xxxxxxxxxxxx>
You could probably split this patch into two:
- one that introduces the get_io_tlb_mem() getter, updates all callers
of is_swiotlb_buffer() to gain a 'struct device' argument
- another one that does add support for a non-default swiotlb pool and
adds dev->dma_io_tlb_mem
Other than that, LGTM!
--
Florian
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