mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 06:28:09 +07:00
e2683957fb
This is a complete rewrite of the Xen TPM frontend driver, taking advantage of a simplified frontend/backend interface and adding support for cancellation and timeouts. The backend for this driver is provided by a vTPM stub domain using the interface in Xen 4.3. Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Acked-by: Matthew Fioravante <matthew.fioravante@jhuapl.edu> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Acked-by: Peter Huewe <peterhuewe@gmx.de> Reviewed-by: Peter Huewe <peterhuewe@gmx.de> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
/******************************************************************************
|
|
* tpmif.h
|
|
*
|
|
* TPM I/O interface for Xen guest OSes, v2
|
|
*
|
|
* This file is in the public domain.
|
|
*
|
|
*/
|
|
|
|
#ifndef __XEN_PUBLIC_IO_TPMIF_H__
|
|
#define __XEN_PUBLIC_IO_TPMIF_H__
|
|
|
|
/*
|
|
* Xenbus state machine
|
|
*
|
|
* Device open:
|
|
* 1. Both ends start in XenbusStateInitialising
|
|
* 2. Backend transitions to InitWait (frontend does not wait on this step)
|
|
* 3. Frontend populates ring-ref, event-channel, feature-protocol-v2
|
|
* 4. Frontend transitions to Initialised
|
|
* 5. Backend maps grant and event channel, verifies feature-protocol-v2
|
|
* 6. Backend transitions to Connected
|
|
* 7. Frontend verifies feature-protocol-v2, transitions to Connected
|
|
*
|
|
* Device close:
|
|
* 1. State is changed to XenbusStateClosing
|
|
* 2. Frontend transitions to Closed
|
|
* 3. Backend unmaps grant and event, changes state to InitWait
|
|
*/
|
|
|
|
enum vtpm_shared_page_state {
|
|
VTPM_STATE_IDLE, /* no contents / vTPM idle / cancel complete */
|
|
VTPM_STATE_SUBMIT, /* request ready / vTPM working */
|
|
VTPM_STATE_FINISH, /* response ready / vTPM idle */
|
|
VTPM_STATE_CANCEL, /* cancel requested / vTPM working */
|
|
};
|
|
/* The backend should only change state to IDLE or FINISH, while the
|
|
* frontend should only change to SUBMIT or CANCEL. */
|
|
|
|
|
|
struct vtpm_shared_page {
|
|
uint32_t length; /* request/response length in bytes */
|
|
|
|
uint8_t state; /* enum vtpm_shared_page_state */
|
|
uint8_t locality; /* for the current request */
|
|
uint8_t pad;
|
|
|
|
uint8_t nr_extra_pages; /* extra pages for long packets; may be zero */
|
|
uint32_t extra_pages[0]; /* grant IDs; length in nr_extra_pages */
|
|
};
|
|
|
|
#endif
|