[PATCH v7 16/22] dma-direct: make dma_direct_map_phys() honor DMA_ATTR_CC_SHARED

[Jason Gunthorpe]

On Sat, Jul 11, 2026 at 12:39:49AM +0530, Aneesh Kumar K.V wrote:

> > But if you really want to it should be
> > cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT) *only* and get rid of the wrong
> > force_dma_unencrypted().
> >
> 
> Ok, I will update the changes to so we preserve the previous behaviour
> for SME?
> 
> 	if (attrs & DMA_ATTR_MMIO) {
> 		/*
> 		 * For host memory encryption treat MMIO memory as shared
> 		 */
> 		if (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT))
> 			attrs |= DMA_ATTR_CC_SHARED;
> 	}

I'm OK with this, with the expectation we should aim to remove it when
fixing the callers.

> > But IMHO, I'd rather this series treat ATTR_MMIO as private MMIO and
> > ATTR_MMIO|CC_SHARED as shared MMIO and that's the right and correct
> > thing for the DMA API.
> >
> 
> If you think the rest of the series is ready for upstream, could you
> please ack it so it can be picked up for the next merge window? I'll
> repost v8, rebased on top of the pKVM topic branch.

Yeah

Jason