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authorHarald Freudenberger <freude@linux.ibm.com>2019-05-21 13:50:09 +0200
committerHeiko Carstens <heiko.carstens@de.ibm.com>2019-05-28 14:49:38 +0200
commit7379e652797c0b9b5f6caea1576f2dff9ce6a708 (patch)
treee961b5617c10a79bd594bc1b7db433d49c39d993 /drivers/s390/crypto/ap_bus.c
parentdcd33b23c9f322274efb94d6e86370bac2b3c68f (diff)
s390/zcrypt: Fix wrong dispatching for control domain CPRBs
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. Signed-off-by: Harald Freudenberger <freude@linux.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'drivers/s390/crypto/ap_bus.c')
-rw-r--r--drivers/s390/crypto/ap_bus.c26
1 files changed, 22 insertions, 4 deletions
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index cc30e4f07fff..b9fc502c58c2 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -254,19 +254,37 @@ 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.
@@ -1267,7 +1285,7 @@ static void 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;
@@ -1442,7 +1460,7 @@ static void _ap_scan_bus_adapter(int id)
(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.

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