Commit 867400af authored by Pankaj Gupta's avatar Pankaj Gupta Committed by Andrew Morton
Browse files

mm/memremap.c: map FS_DAX device memory as decrypted 

virtio_pmem use devm_memremap_pages() to map the device memory.  By
default this memory is mapped as encrypted with SEV.  Guest reboot changes
the current encryption key and guest no longer properly decrypts the FSDAX
device meta data.

Mark the corresponding device memory region for FSDAX devices (mapped with
memremap_pages) as decrypted to retain the persistent memory property.

Link: https://lkml.kernel.org/r/20221102160728.3184016-1-pankaj.gupta@amd.com


Fixes: b7b3c01b ("mm/memremap_pages: support multiple ranges per invocation")
Signed-off-by: default avatarPankaj Gupta <pankaj.gupta@amd.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 624a2c94

mm/memremap.c

+1 −0
Original line number Diff line number Diff line
@@ -335,6 +335,7 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid) 
			WARN(1, "File system DAX not supported\n");

			return ERR_PTR(-EINVAL);

		}

		params.pgprot = pgprot_decrypted(params.pgprot);

		break;

	case MEMORY_DEVICE_GENERIC:

		break;