On Mon, 3 Aug 2020, Christoph Hellwig wrote: > On Sun, Aug 02, 2020 at 09:14:41PM -0700, David Rientjes wrote: > > Christoph: since we have atomic DMA coherent pools in 5.8 now, recall our > > previous discussions, including Greg KH, regarding backports to stable > > trees (we are interested in 5.4 and 5.6) of this support for the purposes > > of confidential VM users who wish to run their own SEV-enabled guests in > > cloud. > > > > Would you have any objections to backports being offered for this support > > now? We can prepare them immediately. Or, if you would prefer we hold > > off for a while, please let me know and we can delay it until you are more > > comfortable. (For confidential VM users, the ability to run your own > > unmodified stable kernel is a much different security story than a guest > > modified by the cloud provider.) > > Before we start backporting I think we need the two fixes from > the "dma pool fixes" series. Can you start reviewing them? I also > think we should probably wait at least until -rc2 for any fallout > before starting the backport. >
Thanks Christoph, this makes perfect sense. I see Nicolas has refreshed the two patches: dma-pool: fix coherent pool allocations for IOMMU mappings dma-pool: Only allocate from CMA when in same memory zone and posted them again today on LKML for review. I'll review those and we'll send a full series of backports for stable consideration for 5.4 LTS and 5.6 around 5.9-rc2 timeframe. Thanks! _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
