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| author |   Dov Murik <dovmurik@linux.ibm.com> | 2022-04-12 21:21:26 +0000 |
|---|---|---|
| committer |   Ard Biesheuvel <ardb@kernel.org> | 2022-04-13 19:11:20 +0200 |
| commit | 20ffd9205ef60fca8912bc9df1602bb627756602 (patch) | |
| tree | ac5b80804d72393998b4fd017c23cffea7ed772a | |
| parent | virt: Add efi_secret module to expose confidential computing secrets (diff) | |
| download | linux-dev-20ffd9205ef60fca8912bc9df1602bb627756602.tar.xz linux-dev-20ffd9205ef60fca8912bc9df1602bb627756602.zip | |
efi: Register efi_secret platform device if EFI secret area is declared
During efi initialization, check if coco_secret is defined in the EFI
configuration table; in such case, register platform device
"efi_secret". This allows udev to automatically load the efi_secret
module (platform driver), which in turn will populate the
<securityfs>/secrets/coco directory in guests into which secrets were
injected.
Note that a declared address of an EFI secret area doesn't mean that
secrets where indeed injected to that area; if the secret area is not
populated, the driver will not load (but the platform device will still
be registered).
Signed-off-by: Dov Murik <dovmurik@linux.ibm.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://lore.kernel.org/r/20220412212127.154182-4-dovmurik@linux.ibm.com
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
| -rw-r--r-- | drivers/firmware/efi/efi.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index e0f43262d451..860534bcfdac 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -425,6 +425,11 @@ static int __init efisubsys_init(void) if (efi_enabled(EFI_DBG) && efi_enabled(EFI_PRESERVE_BS_REGIONS)) efi_debugfs_init(); +#ifdef CONFIG_EFI_COCO_SECRET + if (efi.coco_secret != EFI_INVALID_TABLE_ADDR) + platform_device_register_simple("efi_secret", 0, NULL, 0); +#endif + return 0; err_remove_group: |