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s390/zcrypt: externalize AP config info query

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KVM has a need to fetch the crypto configuration information
as it is returned by the PQAP(QCI) instruction. This patch
introduces a new API ap_query_configuration() which provides
this info in a handy way for the caller.

Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Harald Freudenberger 2016-11-08 11:54:28 +01:00 committed by Martin Schwidefsky
parent e7fc5146cf
commit 050349b5b7
3 changed files with 42 additions and 16 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

26
arch/s390/include/asm/ap.h
View file

@ -61,4 +61,30 @@ struct ap_queue_status ap_test_queue(ap_qid_t qid,
int tbit,
unsigned long *info);
struct ap_config_info {
unsigned int apsc : 1; /* S bit */
unsigned int apxa : 1; /* N bit */
unsigned int qact : 1; /* C bit */
unsigned int rc8a : 1; /* R bit */
unsigned char _reserved1 : 4;
unsigned char _reserved2[3];
unsigned char Na; /* max # of APs - 1 */
unsigned char Nd; /* max # of Domains - 1 */
unsigned char _reserved3[10];
unsigned int apm[8]; /* AP ID mask */
unsigned int aqm[8]; /* AP queue mask */
unsigned int adm[8]; /* AP domain mask */
unsigned char _reserved4[16];
} __aligned(8);
/*
* ap_query_configuration(): Fetch cryptographic config info
*
* Returns the ap configuration info fetched via PQAP(QCI).
* On success 0 is returned, on failure a negative errno
* is returned, e.g. if the PQAP(QCI) instruction is not
* available, the return value will be -EOPNOTSUPP.
*/
int ap_query_configuration(struct ap_config_info *info);
#endif /* _ASM_S390_AP_H_ */

21
drivers/s390/crypto/ap_bus.c
View file

@ -194,12 +194,23 @@ struct ap_queue_status ap_test_queue(ap_qid_t qid,
}
EXPORT_SYMBOL(ap_test_queue);
static inline int ap_query_configuration(void)
/*
* ap_query_configuration(): Fetch cryptographic config info
*
* Returns the ap configuration info fetched via PQAP(QCI).
* On success 0 is returned, on failure a negative errno
* is returned, e.g. if the PQAP(QCI) instruction is not
* available, the return value will be -EOPNOTSUPP.
*/
int ap_query_configuration(struct ap_config_info *info)
{
if (!ap_configuration)
if (!ap_configuration_available())
return -EOPNOTSUPP;
return ap_qci(ap_configuration);
if (!info)
return -EINVAL;
return ap_qci(info);
}
EXPORT_SYMBOL(ap_query_configuration);
/**
* ap_init_configuration(): Allocate and query configuration array.
@ -212,7 +223,7 @@ static void ap_init_configuration(void)
ap_configuration = kzalloc(sizeof(*ap_configuration), GFP_KERNEL);
if (!ap_configuration)
return;
if (ap_query_configuration() != 0) {
if (ap_query_configuration(ap_configuration) != 0) {
kfree(ap_configuration);
ap_configuration = NULL;
return;
@ -1009,7 +1020,7 @@ static void ap_scan_bus(struct work_struct *unused)
AP_DBF(DBF_DEBUG, "ap_scan_bus running\n");
ap_query_configuration();
ap_query_configuration(ap_configuration);
if (ap_select_domain() != 0)
goto out;

11
drivers/s390/crypto/ap_bus.h
View file

@ -204,17 +204,6 @@ struct ap_message {
struct ap_message *);
};
struct ap_config_info {
unsigned int special_command:1;
unsigned int ap_extended:1;
unsigned char reserved1:6;
unsigned char reserved2[15];
unsigned int apm[8]; /* AP ID mask */
unsigned int aqm[8]; /* AP queue mask */
unsigned int adm[8]; /* AP domain mask */
unsigned char reserved4[16];
} __packed;
/**
* ap_init_message() - Initialize ap_message.
* Initialize a message before using. Otherwise this might result in