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

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commit 867400af90f1f953ff9e10b1b87ecaf9369a7eb8 upstream.

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: b7b3c01b19159 ("mm/memremap_pages: support multiple ranges per invocation")
Signed-off-by: Pankaj 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pankaj Gupta 2022-11-02 11:07:28 -05:00 committed by Greg Kroah-Hartman
parent 03f9582a6a
commit 0b692d41ee
1 changed files with 1 additions and 0 deletions
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mm/memremap.c
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@ -348,6 +348,7 @@ 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;