On Tue, Oct 27, 2020 at 08:43:57AM +, Christoph Hellwig wrote:
> On Wed, Oct 21, 2020 at 01:03:22PM -0300, Jason Gunthorpe wrote:
> > Oh, interesting.. Yes the issue is no userspace DMA stuff uses the DMA
> > API correctly (because it is in userspace)
> >
> > So SWIOTLB tricks don't work, I wi
On Wed, Oct 21, 2020 at 01:03:22PM -0300, Jason Gunthorpe wrote:
> Oh, interesting.. Yes the issue is no userspace DMA stuff uses the DMA
> API correctly (because it is in userspace)
>
> So SWIOTLB tricks don't work, I wish the dma_map could fail for these
> situations
Userspace DMA by definition
On Wed, Oct 21, 2020 at 10:30:23AM -0500, Tom Lendacky wrote:
> On 10/21/20 6:59 AM, Jason Gunthorpe wrote:
> > On Mon, Oct 19, 2020 at 11:36:16AM -0500, Tom Lendacky wrote:
> >
> >>> io_remap_pfn_range()? Is there use cases where a caller actually wants
> >>> encrypted io memory?
> >>
> >> As lon
On 10/21/20 6:59 AM, Jason Gunthorpe wrote:
> On Mon, Oct 19, 2020 at 11:36:16AM -0500, Tom Lendacky wrote:
>
>>> io_remap_pfn_range()? Is there use cases where a caller actually wants
>>> encrypted io memory?
>>
>> As long as you never have physical memory / ram being mapped in this path,
>> it s
On Mon, Oct 19, 2020 at 11:36:16AM -0500, Tom Lendacky wrote:
> > io_remap_pfn_range()? Is there use cases where a caller actually wants
> > encrypted io memory?
>
> As long as you never have physical memory / ram being mapped in this path,
> it seems that applying pgprot_decrypted() would be ok.
On Mon, Oct 19, 2020 at 12:11:36PM -0500, Tom Lendacky wrote:
> > Hum, I assume it is broken also. Actually quite a swath of drivers
> > and devices will be broken under this :\
>
> Not sure what you mean by the last statement - in general or when running
> under VFIO/DPDK? In general, traditiona
On 10/19/20 12:00 PM, Jason Gunthorpe wrote:
> On Mon, Oct 19, 2020 at 11:36:16AM -0500, Tom Lendacky wrote:
>
>>> Is RDMA missing something? I don't see anything special in VFIO for
>>> instance and the two are very similar - does VFIO work with SME, eg
>>> DPDK or something unrelated to virtuali
On Mon, Oct 19, 2020 at 11:36:16AM -0500, Tom Lendacky wrote:
> > Is RDMA missing something? I don't see anything special in VFIO for
> > instance and the two are very similar - does VFIO work with SME, eg
> > DPDK or something unrelated to virtualization?
>
> If user space is mapping un-encrypte
On 10/19/20 10:25 AM, Jason Gunthorpe wrote:
> Hi Tom,
Hi Jason,
>
> We've found a bug where systems that have the AMD SME turned on are
> not able to run RDMA work loads. It seems the kernel is automatically
> encrypting VMA's pointing at PCI BAR memory created by
> io_remap_pfn_range() - addin
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