[SRU,B,D,2/2] s390/zcrypt: Fix wrong dispatching for control domain CPRBs (backport)
diff mbox series

Message ID 1561666403-11046-3-git-send-email-frank.heimes@canonical.com
State New
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Series
  • Fix wrong dispatching for control domain CPRBs (LP: 1832624)
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Commit Message

Frank Heimes June 27, 2019, 8:13 p.m. UTC
From: Harald Freudenberger <freude@linux.ibm.com>

BugLink: https://bugs.launchpad.net/bugs/1832624

The zcrypt device driver does not handle CPRBs which address
a control domain correctly. This fix introduces a workaround:
The domain field of the request CPRB is checked if there is
a valid domain value in there. If this is true and the value
is a control only domain (a domain which is enabled in the
crypto config ADM mask but disabled in the AQM mask) the
CPRB is forwarded to the default usage domain. If there is
no default domain, the request is rejected with an ENODEV.

This fix is important for maintaining crypto adapters. For
example one LPAR can use a crypto adapter domain ('Control
and Usage') but another LPAR needs to be able to maintain
this adapter domain ('Control'). Scenarios like this did
not work properly and the patch enables this.

OriginalAuthor: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
(backported from commit 7379e652797c0b9b5f6caea1576f2dff9ce6a708)
Signed-off-by: Frank Heimes <frank.heimes@canonical.com>
---
 arch/s390/include/asm/ap.h       |  4 ++--
 drivers/s390/crypto/ap_bus.c     | 28 +++++++++++++++++++++++-----
 drivers/s390/crypto/ap_bus.h     |  3 +++
 drivers/s390/crypto/zcrypt_api.c | 17 ++++++++++++++---
 4 files changed, 42 insertions(+), 10 deletions(-)

Patch
diff mbox series

diff --git a/arch/s390/include/asm/ap.h b/arch/s390/include/asm/ap.h
index 887494aa164f..949335bdd422 100644
--- a/arch/s390/include/asm/ap.h
+++ b/arch/s390/include/asm/ap.h
@@ -160,8 +160,8 @@  struct ap_config_info {
 	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 int aqm[8];		/* AP (usage) queue mask */
+	unsigned int adm[8];		/* AP (control) domain mask */
 	unsigned char _reserved4[16];
 } __aligned(8);
 
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 1bf1ef355da0..f029aef21978 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -255,19 +255,37 @@  static inline int ap_test_config_card_id(unsigned int id)
 }
 
 /*
- * ap_test_config_domain(): Test, whether an AP usage domain is configured.
+ * ap_test_config_usage_domain(): Test, whether an AP usage domain
+ * is configured.
  * @domain AP usage domain ID
  *
  * Returns 0 if the usage domain is not configured
  *	   1 if the usage domain is configured or
  *	     if the configuration information is not available
  */
-static inline int ap_test_config_domain(unsigned int domain)
+int ap_test_config_usage_domain(unsigned int domain)
 {
 	if (!ap_configuration)	/* QCI not supported */
 		return domain < 16;
 	return ap_test_config(ap_configuration->aqm, domain);
 }
+EXPORT_SYMBOL(ap_test_config_usage_domain);
+
+/*
+ * ap_test_config_ctrl_domain(): Test, whether an AP control domain
+ * is configured.
+ * @domain AP control domain ID
+ *
+ * Returns 1 if the control domain is configured
+ *	   0 in all other cases
+ */
+int ap_test_config_ctrl_domain(unsigned int domain)
+{
+	if (!ap_configuration)	/* QCI not supported */
+		return 0;
+	return ap_test_config(ap_configuration->adm, domain);
+}
+EXPORT_SYMBOL(ap_test_config_ctrl_domain);
 
 /**
  * ap_query_queue(): Check if an AP queue is available.
@@ -1247,7 +1265,7 @@  static int ap_select_domain(void)
 	best_domain = -1;
 	max_count = 0;
 	for (i = 0; i < AP_DOMAINS; i++) {
-		if (!ap_test_config_domain(i) ||
+		if (!ap_test_config_usage_domain(i) ||
 		    !test_bit_inv(i, ap_perms.aqm))
 			continue;
 		count = 0;
@@ -1386,7 +1404,7 @@  static void ap_scan_bus(struct work_struct *unused)
 					      (void *)(long) qid,
 					      __match_queue_device_with_qid);
 			aq = dev ? to_ap_queue(dev) : NULL;
-			if (!ap_test_config_domain(dom)) {
+			if (!ap_test_config_usage_domain(dom)) {
 				if (dev) {
 					/* Queue device exists but has been
 					 * removed from configuration.
@@ -1489,7 +1507,7 @@  static void ap_reset_all(void)
 	int i, j;
 
 	for (i = 0; i < AP_DOMAINS; i++) {
-		if (!ap_test_config_domain(i))
+		if (!ap_test_config_usage_domain(i))
 			continue;
 		for (j = 0; j < AP_DEVICES; j++) {
 			if (!ap_test_config_card_id(j))
diff --git a/drivers/s390/crypto/ap_bus.h b/drivers/s390/crypto/ap_bus.h
index 7e85d238767b..1959c8f5beda 100644
--- a/drivers/s390/crypto/ap_bus.h
+++ b/drivers/s390/crypto/ap_bus.h
@@ -248,6 +248,9 @@  void ap_wait(enum ap_wait wait);
 void ap_request_timeout(struct timer_list *t);
 void ap_bus_force_rescan(void);
 
+int ap_test_config_usage_domain(unsigned int domain);
+int ap_test_config_ctrl_domain(unsigned int domain);
+
 void ap_queue_init_reply(struct ap_queue *aq, struct ap_message *ap_msg);
 struct ap_queue *ap_queue_create(ap_qid_t qid, int device_type);
 void ap_queue_remove(struct ap_queue *aq);
diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
index e6854127b434..e862369a5436 100644
--- a/drivers/s390/crypto/zcrypt_api.c
+++ b/drivers/s390/crypto/zcrypt_api.c
@@ -368,7 +368,7 @@  long zcrypt_send_cprb(struct ica_xcRB *xcRB)
 	struct ap_message ap_msg;
 	unsigned int weight, pref_weight;
 	unsigned int func_code;
-	unsigned short *domain;
+	unsigned short *domain, tdom;
 	int qid = 0, rc = -ENODEV;
 
 	trace_s390_zcrypt_req(xcRB, TB_ZSECSENDCPRB);
@@ -378,6 +378,17 @@  long zcrypt_send_cprb(struct ica_xcRB *xcRB)
 	if (rc)
 		goto out;
 
+	/*
+	 * If a valid target domain is set and this domain is NOT a usage
+	 * domain but a control only domain, use the default domain as target.
+	 */
+	tdom = *domain;
+	if (tdom >= 0 && tdom < AP_DOMAINS &&
+	    !ap_test_config_usage_domain(tdom) &&
+	    ap_test_config_ctrl_domain(tdom) &&
+	    ap_domain_index >= 0)
+		tdom = ap_domain_index;
+
 	pref_zc = NULL;
 	pref_zq = NULL;
 	spin_lock(&zcrypt_list_lock);
@@ -397,8 +408,8 @@  long zcrypt_send_cprb(struct ica_xcRB *xcRB)
 			/* check if device is online and eligible */
 			if (!zq->online ||
 			    !zq->ops->send_cprb ||
-			    ((*domain != (unsigned short) AUTOSELECT) &&
-			     (*domain != AP_QID_QUEUE(zq->queue->qid))))
+			    (tdom != (unsigned short) AUTOSELECT &&
+			     tdom != AP_QID_QUEUE(zq->queue->qid)))
 				continue;
 			if (zcrypt_queue_compare(zq, pref_zq,
 						 weight, pref_weight))