Date:   Thu, 7 Jan 2021 13:00:32 -0500
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     Claire Chang <tientzu@...omium.org>
Cc:     Rob Herring <robh+dt@...nel.org>, mpe@...erman.id.au,
        benh@...nel.crashing.org, paulus@...ba.org,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg
        Roedel <joro@...tes.org>," <joro@...tes.org>, will@...nel.org,
        Frank Rowand <frowand.list@...il.com>,
        boris.ostrovsky@...cle.com, jgross@...e.com,
        sstabellini@...nel.org, Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>, grant.likely@....com,
        xypron.glpk@....de, Thierry Reding <treding@...dia.com>,
        mingo@...nel.org, bauerman@...ux.ibm.com, peterz@...radead.org,
        Greg KH <gregkh@...uxfoundation.org>,
        Saravana Kannan <saravanak@...gle.com>,
        rafael.j.wysocki@...el.com, heikki.krogerus@...ux.intel.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        rdunlap@...radead.org, dan.j.williams@...el.com,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-devicetree <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        linuxppc-dev@...ts.ozlabs.org,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg
        Roedel <joro@...tes.org>," <iommu@...ts.linux-foundation.org>,
        xen-devel@...ts.xenproject.org, Tomasz Figa <tfiga@...omium.org>,
        Nicolas Boichat <drinkcat@...omium.org>
Subject: Re: [RFC PATCH v3 5/6] dt-bindings: of: Add restricted DMA pool

On Fri, Jan 08, 2021 at 01:39:43AM +0800, Claire Chang wrote:
> On Thu, Jan 7, 2021 at 2:58 AM Konrad Rzeszutek Wilk
> <konrad.wilk@...cle.com> wrote:
> >
> > On Wed, Jan 06, 2021 at 11:41:23AM +0800, Claire Chang wrote:
> > > Introduce the new compatible string, restricted-dma-pool, for restricted
> > > DMA. One can specify the address and length of the restricted DMA memory
> > > region by restricted-dma-pool in the device tree.
> > >
> > > Signed-off-by: Claire Chang <tientzu@...omium.org>
> > > ---
> > >  .../reserved-memory/reserved-memory.txt       | 24 +++++++++++++++++++
> > >  1 file changed, 24 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt b/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
> > > index e8d3096d922c..44975e2a1fd2 100644
> > > --- a/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
> > > +++ b/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
> > > @@ -51,6 +51,20 @@ compatible (optional) - standard definition
> > >            used as a shared pool of DMA buffers for a set of devices. It can
> > >            be used by an operating system to instantiate the necessary pool
> > >            management subsystem if necessary.
> > > +        - restricted-dma-pool: This indicates a region of memory meant to be
> > > +          used as a pool of restricted DMA buffers for a set of devices. The
> > > +          memory region would be the only region accessible to those devices.
> > > +          When using this, the no-map and reusable properties must not be set,
> > > +          so the operating system can create a virtual mapping that will be used
> > > +          for synchronization. The main purpose for restricted DMA is to
> > > +          mitigate the lack of DMA access control on systems without an IOMMU,
> > > +          which could result in the DMA accessing the system memory at
> > > +          unexpected times and/or unexpected addresses, possibly leading to data
> > > +          leakage or corruption. The feature on its own provides 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 way to restrict
> > > +          the DMA to a predefined memory region.
> >
> > Heya!
> >
> > I think I am missing something obvious here so please bear with my
> > questions:
> >
> >  - This code adds the means of having the SWIOTLB pool tied to a specific
> >    memory correct?
> 
> It doesn't affect the existing SWIOTLB. It just utilizes the existing SWIOTLB
> code to create another DMA pool tied to a specific memory region for a given set
> of devices. It bounces the streaming DMA (map/unmap) in and out of that region
> and does the memory allocation (dma_direct_alloc) from the same region.

Right, so why can't it follow the same mechanism that Xen SWIOTLB does - which
had exactly the same problem (needed special handling on the pool) - and do
a similar code?

> 
> >
> >
> >  - Nothing stops the physical device from bypassing the SWIOTLB buffer.
> >    That is if an errant device screwed up the length or DMA address, the
> >    SWIOTLB would gladly do what the device told it do?
> 
> So the system needs to provide a way to lock down the memory access, e.g. MPU.

OK! Would it be prudent to have this in the description above perhaps?
> 
> >
> >  - This has to be combined with SWIOTLB-force-ish to always use the
> >    bounce buffer, otherwise you could still do DMA without using
> >    SWIOTLB (by not hitting the criteria for needing to use SWIOTLB)?
> 
> Since restricted DMA is for the devices that are not behind an IOMMU, I change
> the criteria
> `if (unlikely(swiotlb_force == SWIOTLB_FORCE))`
> to
> `if (unlikely(swiotlb_force == SWIOTLB_FORCE) || dev->dma_io_tlb_mem)`
> in dma_direct_map_page().
> 
> Also, even if SWIOTLB=force, the restricted DMA pool is preferred if available
> (get_io_tlb_mem in https://lore.kernel.org/patchwork/patch/1360995/).
> 
> Thanks!

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