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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __TSM_H
#define __TSM_H
#include <linux/sizes.h>
#include <linux/types.h>
#define TSM_INBLOB_MAX 64
#define TSM_OUTBLOB_MAX SZ_32K
/*
* Privilege level is a nested permission concept to allow confidential
* guests to partition address space, 4-levels are supported.
*/
#define TSM_PRIVLEVEL_MAX 3
/**
* struct tsm_desc - option descriptor for generating tsm report blobs
* @privlevel: optional privilege level to associate with @outblob
* @inblob_len: sizeof @inblob
* @inblob: arbitrary input data
*/
struct tsm_desc {
unsigned int privlevel;
size_t inblob_len;
u8 inblob[TSM_INBLOB_MAX];
};
/**
* struct tsm_report - track state of report generation relative to options
* @desc: input parameters to @report_new()
* @outblob_len: sizeof(@outblob)
* @outblob: generated evidence to provider to the attestation agent
* @auxblob_len: sizeof(@auxblob)
* @auxblob: (optional) auxiliary data to the report (e.g. certificate data)
*/
struct tsm_report {
struct tsm_desc desc;
size_t outblob_len;
u8 *outblob;
size_t auxblob_len;
u8 *auxblob;
};
/**
* struct tsm_ops - attributes and operations for tsm instances
* @name: tsm id reflected in /sys/kernel/config/tsm/report/$report/provider
* @privlevel_floor: convey base privlevel for nested scenarios
* @report_new: Populate @report with the report blob and auxblob
* (optional), return 0 on successful population, or -errno otherwise
*
* Implementation specific ops, only one is expected to be registered at
* a time i.e. only one of "sev-guest", "tdx-guest", etc.
*/
struct tsm_ops {
const char *name;
const unsigned int privlevel_floor;
int (*report_new)(struct tsm_report *report, void *data);
};
extern const struct config_item_type tsm_report_default_type;
/* publish @privlevel, @privlevel_floor, and @auxblob attributes */
extern const struct config_item_type tsm_report_extra_type;
int tsm_register(const struct tsm_ops *ops, void *priv,
const struct config_item_type *type);
int tsm_unregister(const struct tsm_ops *ops);
#endif /* __TSM_H */
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