Re: [RFC PATCH kernel 10/17] x86, dma: Allow accepted devices to map private memory

[Jason Gunthorpe]

On Wed, Sep 16, 2026 at 09:51:50PM +1000, Alexey Kardashevskiy wrote:
>  bool force_dma_unencrypted(struct device *dev)
>  {
>  	/*
> -	 * For SEV, all DMA must be to unencrypted addresses.
> +	 * Require unencrypted DMA unless the device has been "accepted",
> +	 * enabled by a TSM driver to DMA to private encrypted memory.
>  	 */
>  	if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
> -		return true;
> +		return !__device_cc_accepted(dev);

I want this out of arch code, after Aneesh's recent rework Nicolin is trying
this approach:

https://lore.kernel.org/all/abddd433493324a6bfdf8ba9710e96d90f0d1ccc.1789010941.git.nicolinc@xxxxxxxxxx/

Jason