The patch titled
Subject: mm/memremap.c: map FS_DAX device memory as decrypted
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-memremapc-map-fs_dax-device-memory-as-decrypted.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memremapc-map-fs_dax-device-memory-as-decrypted.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Pankaj Gupta <pankaj.gupta@xxxxxxx>
Subject: mm/memremap.c: map FS_DAX device memory as decrypted
Date: Wed, 2 Nov 2022 11:07:28 -0500
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@xxxxxxx
Fixes: b7b3c01b19159 ("mm/memremap_pages: support multiple ranges per invocation")
Signed-off-by: Pankaj Gupta <pankaj.gupta@xxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memremap.c | 1 +
1 file changed, 1 insertion(+)
--- a/mm/memremap.c~mm-memremapc-map-fs_dax-device-memory-as-decrypted
+++ a/mm/memremap.c
@@ -335,6 +335,7 @@ void *memremap_pages(struct dev_pagemap
WARN(1, "File system DAX not supported\n");
return ERR_PTR(-EINVAL);
}
+ params.pgprot = pgprot_decrypted(params.pgprot);
break;
case MEMORY_DEVICE_GENERIC:
break;
_
Patches currently in -mm which might be from pankaj.gupta@xxxxxxx are
mm-memremapc-map-fs_dax-device-memory-as-decrypted.patch
