[PATCH v2 02/12] mm: Introduce a function to check for virtualization protection features

[Christoph Hellwig]

On Fri, Aug 13, 2021 at 11:59:21AM -0500, Tom Lendacky wrote:
> +#define PATTR_MEM_ENCRYPT		0	/* Encrypted memory */
> +#define PATTR_HOST_MEM_ENCRYPT		1	/* Host encrypted memory */
> +#define PATTR_GUEST_MEM_ENCRYPT		2	/* Guest encrypted memory */
> +#define PATTR_GUEST_PROT_STATE		3	/* Guest encrypted state */

Please write an actual detailed explanaton of what these mean, that
is what implications it has on the kernel.