Re: [PATCH 07/11] treewide: Replace the use of mem_encrypt_active() with prot_guest_has()

On Tue, Jul 27, 2021, Tom Lendacky wrote:

@@ -451,7 +450,7 @@ void __init mem_encrypt_free_decrypted_mem(void) * The unused memory range was mapped decrypted, change the encryption * attribute from decrypted to encrypted before freeing it. */

• if (mem_encrypt_active()) {

• if (sme_me_mask) {

Any reason this uses sme_me_mask? The helper it calls, __set_memory_enc_dec(), uses prot_guest_has(PATTR_MEM_ENCRYPT) so I assume it's available?

r = set_memory_encrypted(vaddr, npages);
if (r) {
	pr_warn("failed to free unused decrypted pages\n");