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crypto: ccp - Name -1 return value as SEV_RET_NO_FW_CALL

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The PSP can return a "firmware error" code of -1 in circumstances where
the PSP has not actually been called. To make this protocol unambiguous,
name the value SEV_RET_NO_FW_CALL.

  [ bp: Massage a bit. ]

Signed-off-by: Peter Gonda <pgonda@google.com>
Signed-off-by: Dionna Glaze <dionnaglaze@google.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20221207010210.2563293-2-dionnaglaze@google.com
This commit is contained in:
Peter Gonda 2023-03-07 20:24:39 +01:00 • committed by Borislav Petkov (AMD)
parent e8d018dd02
commit efb339a833
3 changed files with 14 additions and 5 deletions
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7
include/uapi/linux/psp-sev.h
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@ -36,6 +36,13 @@ enum {
* SEV Firmware status code
*/
typedef enum {
/*
* This error code is not in the SEV spec. Its purpose is to convey that
* there was an error that prevented the SEV firmware from being called.
* The SEV API error codes are 16 bits, so the -1 value will not overlap
* with possible values from the specification.
*/
SEV_RET_NO_FW_CALL = -1,
SEV_RET_SUCCESS = 0,
SEV_RET_INVALID_PLATFORM_STATE,
SEV_RET_INVALID_GUEST_STATE,