On Mon, 13 May 2024 20:46:08 -0500, Gaurav Batra wrote:
> Dynamic DMA Window (DDW) supports TCEs that are backed by 2MB page size.
> In most configurations, DDW is big enough to pre-map all of LPAR memory
> for IO. Pre-mapping of memory for DMA results in improvements in IO
> performance.
>
> Persistent memory, vPMEM, can be assigned to an LPAR as well. vPMEM is not
> contiguous with LPAR memory and usually is assigned at high memory
> addresses. This makes is not possible to pre-map both vPMEM and LPAR
> memory in the same DDW.
>
> [...]
Applied to powerpc/next.
[1/1] powerpc/pseries/iommu: Split Dynamic DMA Window to be used in Hybrid mode
https://git.kernel.org/powerpc/c/ff5163bb7000a0254ffdd7b50cb6df43add94f33
cheers
