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s390/crypto: Display Query and Query Authentication Information in sysfs

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Displays the query (fc=0) and query authentication information (fc=127)
as binary in sysfs per CPACF instruction. Files are located in
/sys/devices/system/cpu/cpacf/. These information can be fetched via
asm already except for PCKMO because this instruction is privileged. To
offer a unified interface all CPACF instructions will have this
information displayed in sysfs in files <instruction>_query_raw and
<instruction>_query_auth_info_raw.

A new tool introduced into s390-tools called cpacfinfo will use this
information to convert and display in human readable form.

Suggested-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Finn Callies <fcallies@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Finn Callies 2024-09-11 09:21:09 +02:00 committed by Vasily Gorbik
parent 9bbd1bfb86
commit 9fed8d7c46
2 changed files with 120 additions and 0 deletions
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1
arch/s390/kernel/Makefile
View File

@ -50,6 +50,7 @@ extra-y += vmlinux.lds
obj-$(CONFIG_SYSFS) += nospec-sysfs.o
CFLAGS_REMOVE_nospec-branch.o += $(CC_FLAGS_EXPOLINE)
obj-$(CONFIG_SYSFS) += cpacf.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_SCHED_TOPOLOGY) += topology.o hiperdispatch.o
obj-$(CONFIG_NUMA) += numa.o

119
arch/s390/kernel/cpacf.c Normal file
View File

@ -0,0 +1,119 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright IBM Corp. 2024
*/
#define KMSG_COMPONENT "cpacf"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/cpu.h>
#include <linux/device.h>
#include <linux/sysfs.h>
#include <asm/cpacf.h>
#define CPACF_QUERY(name, instruction) \
static ssize_t name##_query_raw_read(struct file *fp, \
struct kobject *kobj, \
struct bin_attribute *attr, \
char *buf, loff_t offs, \
size_t count) \
{ \
cpacf_mask_t mask; \
\
if (!cpacf_query(CPACF_##instruction, &mask)) \
return -EOPNOTSUPP; \
return memory_read_from_buffer(buf, count, &offs, &mask, sizeof(mask)); \
} \
static BIN_ATTR_RO(name##_query_raw, sizeof(cpacf_mask_t))
CPACF_QUERY(km, KM);
CPACF_QUERY(kmc, KMC);
CPACF_QUERY(kimd, KIMD);
CPACF_QUERY(klmd, KLMD);
CPACF_QUERY(kmac, KMAC);
CPACF_QUERY(pckmo, PCKMO);
CPACF_QUERY(kmf, KMF);
CPACF_QUERY(kmctr, KMCTR);
CPACF_QUERY(kmo, KMO);
CPACF_QUERY(pcc, PCC);
CPACF_QUERY(prno, PRNO);
CPACF_QUERY(kma, KMA);
CPACF_QUERY(kdsa, KDSA);
#define CPACF_QAI(name, instruction) \
static ssize_t name##_query_auth_info_raw_read( \
struct file *fp, struct kobject *kobj, \
struct bin_attribute *attr, char *buf, loff_t offs, \
size_t count) \
{ \
cpacf_qai_t qai; \
\
if (!cpacf_qai(CPACF_##instruction, &qai)) \
return -EOPNOTSUPP; \
return memory_read_from_buffer(buf, count, &offs, &qai, \
sizeof(qai)); \
} \
static BIN_ATTR_RO(name##_query_auth_info_raw, sizeof(cpacf_qai_t))
CPACF_QAI(km, KM);
CPACF_QAI(kmc, KMC);
CPACF_QAI(kimd, KIMD);
CPACF_QAI(klmd, KLMD);
CPACF_QAI(kmac, KMAC);
CPACF_QAI(pckmo, PCKMO);
CPACF_QAI(kmf, KMF);
CPACF_QAI(kmctr, KMCTR);
CPACF_QAI(kmo, KMO);
CPACF_QAI(pcc, PCC);
CPACF_QAI(prno, PRNO);
CPACF_QAI(kma, KMA);
CPACF_QAI(kdsa, KDSA);
static struct bin_attribute *cpacf_attrs[] = {
&bin_attr_km_query_raw,
&bin_attr_kmc_query_raw,
&bin_attr_kimd_query_raw,
&bin_attr_klmd_query_raw,
&bin_attr_kmac_query_raw,
&bin_attr_pckmo_query_raw,
&bin_attr_kmf_query_raw,
&bin_attr_kmctr_query_raw,
&bin_attr_kmo_query_raw,
&bin_attr_pcc_query_raw,
&bin_attr_prno_query_raw,
&bin_attr_kma_query_raw,
&bin_attr_kdsa_query_raw,
&bin_attr_km_query_auth_info_raw,
&bin_attr_kmc_query_auth_info_raw,
&bin_attr_kimd_query_auth_info_raw,
&bin_attr_klmd_query_auth_info_raw,
&bin_attr_kmac_query_auth_info_raw,
&bin_attr_pckmo_query_auth_info_raw,
&bin_attr_kmf_query_auth_info_raw,
&bin_attr_kmctr_query_auth_info_raw,
&bin_attr_kmo_query_auth_info_raw,
&bin_attr_pcc_query_auth_info_raw,
&bin_attr_prno_query_auth_info_raw,
&bin_attr_kma_query_auth_info_raw,
&bin_attr_kdsa_query_auth_info_raw,
NULL,
};
static const struct attribute_group cpacf_attr_grp = {
.name = "cpacf",
.bin_attrs = cpacf_attrs,
};
static int __init cpacf_init(void)
{
struct device *cpu_root;
int rc = 0;
cpu_root = bus_get_dev_root(&cpu_subsys);
if (cpu_root) {
rc = sysfs_create_group(&cpu_root->kobj, &cpacf_attr_grp);
put_device(cpu_root);
}
return rc;
}
device_initcall(cpacf_init);