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/*
* s390 storage key device
*
* Copyright 2015 IBM Corp.
* Author(s): Jason J. Herne <jjherne@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at
* your option) any later version. See the COPYING file in the top-level
* directory.
*/
#include "hw/boards.h"
#include "qmp-commands.h"
#include "hw/s390x/storage-keys.h"
#include "qemu/error-report.h"
#define S390_SKEYS_BUFFER_SIZE 131072 /* Room for 128k storage keys */
S390SKeysState *s390_get_skeys_device(void)
{
S390SKeysState *ss;
ss = S390_SKEYS(object_resolve_path_type("", TYPE_S390_SKEYS, NULL));
assert(ss);
return ss;
}
void s390_skeys_init(void)
{
Object *obj;
if (kvm_enabled()) {
obj = object_new(TYPE_KVM_S390_SKEYS);
} else {
obj = object_new(TYPE_QEMU_S390_SKEYS);
}
object_property_add_child(qdev_get_machine(), TYPE_S390_SKEYS,
obj, NULL);
object_unref(obj);
qdev_init_nofail(DEVICE(obj));
}
static void write_keys(QEMUFile *f, uint8_t *keys, uint64_t startgfn,
uint64_t count, Error **errp)
{
uint64_t curpage = startgfn;
uint64_t maxpage = curpage + count - 1;
const char *fmt = "page=%03" PRIx64 ": key(%d) => ACC=%X, FP=%d, REF=%d,"
" ch=%d, reserved=%d\n";
char buf[128];
int len;
for (; curpage <= maxpage; curpage++) {
uint8_t acc = (*keys & 0xF0) >> 4;
int fp = (*keys & 0x08);
int ref = (*keys & 0x04);
int ch = (*keys & 0x02);
int res = (*keys & 0x01);
len = snprintf(buf, sizeof(buf), fmt, curpage,
*keys, acc, fp, ref, ch, res);
assert(len < sizeof(buf));
qemu_put_buffer(f, (uint8_t *)buf, len);
keys++;
}
}
void qmp_dump_skeys(const char *filename, Error **errp)
{
S390SKeysState *ss = s390_get_skeys_device();
S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
const uint64_t total_count = ram_size / TARGET_PAGE_SIZE;
uint64_t handled_count = 0, cur_count;
Error *lerr = NULL;
vaddr cur_gfn = 0;
uint8_t *buf;
int ret;
QEMUFile *f;
/* Quick check to see if guest is using storage keys*/
if (!skeyclass->skeys_enabled(ss)) {
error_setg(errp, "This guest is not using storage keys - "
"nothing to dump");
return;
}
f = qemu_fopen(filename, "wb");
if (!f) {
error_setg_file_open(errp, errno, filename);
return;
}
buf = g_try_malloc(S390_SKEYS_BUFFER_SIZE);
if (!buf) {
error_setg(errp, "Could not allocate memory");
goto out;
}
/* we'll only dump initial memory for now */
while (handled_count < total_count) {
/* Calculate how many keys to ask for & handle overflow case */
cur_count = MIN(total_count - handled_count, S390_SKEYS_BUFFER_SIZE);
ret = skeyclass->get_skeys(ss, cur_gfn, cur_count, buf);
if (ret < 0) {
error_setg(errp, "get_keys error %d", ret);
goto out_free;
}
/* write keys to stream */
write_keys(f, buf, cur_gfn, cur_count, &lerr);
if (lerr) {
goto out_free;
}
cur_gfn += cur_count;
handled_count += cur_count;
}
out_free:
error_propagate(errp, lerr);
g_free(buf);
out:
qemu_fclose(f);
}
static void qemu_s390_skeys_init(Object *obj)
{
QEMUS390SKeysState *skeys = QEMU_S390_SKEYS(obj);
MachineState *machine = MACHINE(qdev_get_machine());
skeys->key_count = machine->maxram_size / TARGET_PAGE_SIZE;
skeys->keydata = g_malloc0(skeys->key_count);
}
static int qemu_s390_skeys_enabled(S390SKeysState *ss)
{
return 1;
}
/*
* TODO: for memory hotplug support qemu_s390_skeys_set and qemu_s390_skeys_get
* will have to make sure that the given gfn belongs to a memory region and not
* a memory hole.
*/
static int qemu_s390_skeys_set(S390SKeysState *ss, uint64_t start_gfn,
uint64_t count, uint8_t *keys)
{
QEMUS390SKeysState *skeydev = QEMU_S390_SKEYS(ss);
int i;
/* Check for uint64 overflow and access beyond end of key data */
if (start_gfn + count > skeydev->key_count || start_gfn + count < count) {
error_report("Error: Setting storage keys for page beyond the end "
"of memory: gfn=%" PRIx64 " count=%" PRId64 "\n", start_gfn,
count);
return -EINVAL;
}
for (i = 0; i < count; i++) {
skeydev->keydata[start_gfn + i] = keys[i];
}
return 0;
}
static int qemu_s390_skeys_get(S390SKeysState *ss, uint64_t start_gfn,
uint64_t count, uint8_t *keys)
{
QEMUS390SKeysState *skeydev = QEMU_S390_SKEYS(ss);
int i;
/* Check for uint64 overflow and access beyond end of key data */
if (start_gfn + count > skeydev->key_count || start_gfn + count < count) {
error_report("Error: Getting storage keys for page beyond the end "
"of memory: gfn=%" PRIx64 " count=%" PRId64 "\n", start_gfn,
count);
return -EINVAL;
}
for (i = 0; i < count; i++) {
keys[i] = skeydev->keydata[start_gfn + i];
}
return 0;
}
static void qemu_s390_skeys_class_init(ObjectClass *oc, void *data)
{
S390SKeysClass *skeyclass = S390_SKEYS_CLASS(oc);
skeyclass->skeys_enabled = qemu_s390_skeys_enabled;
skeyclass->get_skeys = qemu_s390_skeys_get;
skeyclass->set_skeys = qemu_s390_skeys_set;
}
static const TypeInfo qemu_s390_skeys_info = {
.name = TYPE_QEMU_S390_SKEYS,
.parent = TYPE_S390_SKEYS,
.instance_init = qemu_s390_skeys_init,
.instance_size = sizeof(QEMUS390SKeysState),
.class_init = qemu_s390_skeys_class_init,
.instance_size = sizeof(S390SKeysClass),
};
static void s390_skeys_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
dc->hotpluggable = false;
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
}
static const TypeInfo s390_skeys_info = {
.name = TYPE_S390_SKEYS,
.parent = TYPE_DEVICE,
.instance_size = sizeof(S390SKeysState),
.class_init = s390_skeys_class_init,
.class_size = sizeof(S390SKeysClass),
.abstract = true,
};
static void qemu_s390_skeys_register_types(void)
{
type_register_static(&s390_skeys_info);
type_register_static(&qemu_s390_skeys_info);
}
type_init(qemu_s390_skeys_register_types)
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