On 04/09/2020 16:04, Leonardo Bras wrote:
On Thu, 2020-09-03 at 14:41 +1000, Alexey Kardashevskiy wrote:
I am new to this, so I am trying to understand how a memory page mapped
as DMA, and used for something else could be a problem.
From the device prospective, there is PCI space and
On Thu, 2020-09-03 at 14:41 +1000, Alexey Kardashevskiy wrote:
> I am new to this, so I am trying to understand how a memory page mapped
> > as DMA, and used for something else could be a problem.
>
> From the device prospective, there is PCI space and everything from 0
> till 1<<64 is
On 02/09/2020 08:34, Leonardo Bras wrote:
On Mon, 2020-08-31 at 10:47 +1000, Alexey Kardashevskiy wrote:
Maybe testing with host 64k pagesize and IOMMU 16MB pagesize in qemu
should be enough, is there any chance to get indirect mapping in qemu
like this? (DDW but with smaller DMA window
On Mon, 2020-08-31 at 10:47 +1000, Alexey Kardashevskiy wrote:
> >
> > Maybe testing with host 64k pagesize and IOMMU 16MB pagesize in qemu
> > should be enough, is there any chance to get indirect mapping in qemu
> > like this? (DDW but with smaller DMA window available)
>
> You will have to
On 29/08/2020 06:41, Leonardo Bras wrote:
> On Fri, 2020-08-28 at 11:40 +1000, Alexey Kardashevskiy wrote:
>>> I think it would be better to keep the code as much generic as possible
>>> regarding page sizes.
>>
>> Then you need to test it. Does 4K guest even boot (it should but I would
>> not
On Fri, 2020-08-28 at 11:40 +1000, Alexey Kardashevskiy wrote:
> > I think it would be better to keep the code as much generic as possible
> > regarding page sizes.
>
> Then you need to test it. Does 4K guest even boot (it should but I would
> not bet much on it)?
Maybe testing with host 64k
On 28/08/2020 02:51, Leonardo Bras wrote:
> On Sat, 2020-08-22 at 20:07 +1000, Alexey Kardashevskiy wrote:
>>
>> On 18/08/2020 09:40, Leonardo Bras wrote:
>>> Both iommu_alloc_coherent() and iommu_free_coherent() assume that once
>>> size is aligned to PAGE_SIZE it will be aligned to
On Sat, 2020-08-22 at 20:07 +1000, Alexey Kardashevskiy wrote:
>
> On 18/08/2020 09:40, Leonardo Bras wrote:
> > Both iommu_alloc_coherent() and iommu_free_coherent() assume that once
> > size is aligned to PAGE_SIZE it will be aligned to IOMMU_PAGE_SIZE.
>
> The only case when it is not aligned
On 18/08/2020 09:40, Leonardo Bras wrote:
> Both iommu_alloc_coherent() and iommu_free_coherent() assume that once
> size is aligned to PAGE_SIZE it will be aligned to IOMMU_PAGE_SIZE.
The only case when it is not aligned is when IOMMU_PAGE_SIZE > PAGE_SIZE
which is unlikely but not
Both iommu_alloc_coherent() and iommu_free_coherent() assume that once
size is aligned to PAGE_SIZE it will be aligned to IOMMU_PAGE_SIZE.
Update those functions to guarantee alignment with requested size
using IOMMU_PAGE_ALIGN() before doing iommu_alloc() / iommu_free().
Also, on
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