qemu/hw/s390x/s390-stattrib.c

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/*
* s390 storage attributes device
*
* Copyright 2016 IBM Corp.
* Author(s): Claudio Imbrenda <imbrenda@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 "qemu/osdep.h"
#include "qemu/units.h"
#include "cpu.h"
#include "migration/qemu-file.h"
#include "migration/register.h"
#include "hw/s390x/storage-attributes.h"
#include "qemu/error-report.h"
#include "exec/ram_addr.h"
#include "qapi/error.h"
#include "qapi/qmp/qdict.h"
/* 512KiB cover 2GB of guest memory */
#define CMMA_BLOCK_SIZE (512 * KiB)
#define STATTR_FLAG_EOS 0x01ULL
#define STATTR_FLAG_MORE 0x02ULL
#define STATTR_FLAG_ERROR 0x04ULL
#define STATTR_FLAG_DONE 0x08ULL
static S390StAttribState *s390_get_stattrib_device(void)
{
S390StAttribState *sas;
sas = S390_STATTRIB(object_resolve_path_type("", TYPE_S390_STATTRIB, NULL));
assert(sas);
return sas;
}
void s390_stattrib_init(void)
{
Object *obj;
obj = kvm_s390_stattrib_create();
if (!obj) {
obj = object_new(TYPE_QEMU_S390_STATTRIB);
}
object_property_add_child(qdev_get_machine(), TYPE_S390_STATTRIB,
qom: Drop parameter @errp of object_property_add() & friends The only way object_property_add() can fail is when a property with the same name already exists. Since our property names are all hardcoded, failure is a programming error, and the appropriate way to handle it is passing &error_abort. Same for its variants, except for object_property_add_child(), which additionally fails when the child already has a parent. Parentage is also under program control, so this is a programming error, too. We have a bit over 500 callers. Almost half of them pass &error_abort, slightly fewer ignore errors, one test case handles errors, and the remaining few callers pass them to their own callers. The previous few commits demonstrated once again that ignoring programming errors is a bad idea. Of the few ones that pass on errors, several violate the Error API. The Error ** argument must be NULL, &error_abort, &error_fatal, or a pointer to a variable containing NULL. Passing an argument of the latter kind twice without clearing it in between is wrong: if the first call sets an error, it no longer points to NULL for the second call. ich9_pm_add_properties(), sparc32_ledma_realize(), sparc32_dma_realize(), xilinx_axidma_realize(), xilinx_enet_realize() are wrong that way. When the one appropriate choice of argument is &error_abort, letting users pick the argument is a bad idea. Drop parameter @errp and assert the preconditions instead. There's one exception to "duplicate property name is a programming error": the way object_property_add() implements the magic (and undocumented) "automatic arrayification". Don't drop @errp there. Instead, rename object_property_add() to object_property_try_add(), and add the obvious wrapper object_property_add(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20200505152926.18877-15-armbru@redhat.com> [Two semantic rebase conflicts resolved]
2020-05-05 23:29:22 +08:00
obj);
object_unref(obj);
qdev_realize(DEVICE(obj), NULL, &error_fatal);
}
/* Console commands: */
void hmp_migrationmode(Monitor *mon, const QDict *qdict)
{
S390StAttribState *sas = s390_get_stattrib_device();
S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
uint64_t what = qdict_get_int(qdict, "mode");
int r;
r = sac->set_migrationmode(sas, what);
if (r < 0) {
monitor_printf(mon, "Error: %s", strerror(-r));
}
}
void hmp_info_cmma(Monitor *mon, const QDict *qdict)
{
S390StAttribState *sas = s390_get_stattrib_device();
S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
uint64_t addr = qdict_get_int(qdict, "addr");
uint64_t buflen = qdict_get_try_int(qdict, "count", 8);
uint8_t *vals;
int cx, len;
vals = g_try_malloc(buflen);
if (!vals) {
monitor_printf(mon, "Error: %s\n", strerror(errno));
return;
}
len = sac->peek_stattr(sas, addr / TARGET_PAGE_SIZE, buflen, vals);
if (len < 0) {
monitor_printf(mon, "Error: %s", strerror(-len));
goto out;
}
monitor_printf(mon, " CMMA attributes, "
"pages %" PRIu64 "+%d (0x%" PRIx64 "):\n",
addr / TARGET_PAGE_SIZE, len, addr & ~TARGET_PAGE_MASK);
for (cx = 0; cx < len; cx++) {
if (cx % 8 == 7) {
monitor_printf(mon, "%02x\n", vals[cx]);
} else {
monitor_printf(mon, "%02x", vals[cx]);
}
}
monitor_printf(mon, "\n");
out:
g_free(vals);
}
/* Migration support: */
static int cmma_load(QEMUFile *f, void *opaque, int version_id)
{
S390StAttribState *sas = S390_STATTRIB(opaque);
S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
uint64_t count, cur_gfn;
int flags, ret = 0;
ram_addr_t addr;
uint8_t *buf;
while (!ret) {
addr = qemu_get_be64(f);
flags = addr & ~TARGET_PAGE_MASK;
addr &= TARGET_PAGE_MASK;
switch (flags) {
case STATTR_FLAG_MORE: {
cur_gfn = addr / TARGET_PAGE_SIZE;
count = qemu_get_be64(f);
buf = g_try_malloc(count);
if (!buf) {
error_report("cmma_load could not allocate memory");
ret = -ENOMEM;
break;
}
qemu_get_buffer(f, buf, count);
ret = sac->set_stattr(sas, cur_gfn, count, buf);
if (ret < 0) {
error_report("Error %d while setting storage attributes", ret);
}
g_free(buf);
break;
}
case STATTR_FLAG_ERROR: {
error_report("Storage attributes data is incomplete");
ret = -EINVAL;
break;
}
case STATTR_FLAG_DONE:
/* This is after the last pre-copied value has been sent, nothing
* more will be sent after this. Pre-copy has finished, and we
* are done flushing all the remaining values. Now the target
* system is about to take over. We synchronize the buffer to
* apply the actual correct values where needed.
*/
sac->synchronize(sas);
break;
case STATTR_FLAG_EOS:
/* Normal exit */
return 0;
default:
error_report("Unexpected storage attribute flag data: %#x", flags);
ret = -EINVAL;
}
}
return ret;
}
static int cmma_save_setup(QEMUFile *f, void *opaque)
{
S390StAttribState *sas = S390_STATTRIB(opaque);
S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
int res;
/*
* Signal that we want to start a migration, thus needing PGSTE dirty
* tracking.
*/
res = sac->set_migrationmode(sas, 1);
if (res) {
return res;
}
qemu_put_be64(f, STATTR_FLAG_EOS);
return 0;
}
static void cmma_save_pending(QEMUFile *f, void *opaque, uint64_t max_size,
uint64_t *res_precopy_only,
uint64_t *res_compatible,
uint64_t *res_postcopy_only)
{
S390StAttribState *sas = S390_STATTRIB(opaque);
S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
long long res = sac->get_dirtycount(sas);
if (res >= 0) {
*res_precopy_only += res;
}
}
static int cmma_save(QEMUFile *f, void *opaque, int final)
{
S390StAttribState *sas = S390_STATTRIB(opaque);
S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
uint8_t *buf;
int r, cx, reallen = 0, ret = 0;
uint32_t buflen = CMMA_BLOCK_SIZE;
uint64_t start_gfn = sas->migration_cur_gfn;
buf = g_try_malloc(buflen);
if (!buf) {
error_report("Could not allocate memory to save storage attributes");
return -ENOMEM;
}
while (final ? 1 : qemu_file_rate_limit(f) == 0) {
reallen = sac->get_stattr(sas, &start_gfn, buflen, buf);
if (reallen < 0) {
g_free(buf);
return reallen;
}
ret = 1;
if (!reallen) {
break;
}
qemu_put_be64(f, (start_gfn << TARGET_PAGE_BITS) | STATTR_FLAG_MORE);
qemu_put_be64(f, reallen);
for (cx = 0; cx < reallen; cx++) {
qemu_put_byte(f, buf[cx]);
}
if (!sac->get_dirtycount(sas)) {
break;
}
}
sas->migration_cur_gfn = start_gfn + reallen;
g_free(buf);
if (final) {
qemu_put_be64(f, STATTR_FLAG_DONE);
}
qemu_put_be64(f, STATTR_FLAG_EOS);
r = qemu_file_get_error(f);
if (r < 0) {
return r;
}
return ret;
}
static int cmma_save_iterate(QEMUFile *f, void *opaque)
{
return cmma_save(f, opaque, 0);
}
static int cmma_save_complete(QEMUFile *f, void *opaque)
{
return cmma_save(f, opaque, 1);
}
static void cmma_save_cleanup(void *opaque)
{
S390StAttribState *sas = S390_STATTRIB(opaque);
S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
sac->set_migrationmode(sas, 0);
}
static bool cmma_active(void *opaque)
{
S390StAttribState *sas = S390_STATTRIB(opaque);
S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
return sac->get_active(sas);
}
/* QEMU object: */
static void qemu_s390_stattrib_instance_init(Object *obj)
{
}
static int qemu_s390_peek_stattr_stub(S390StAttribState *sa, uint64_t start_gfn,
uint32_t count, uint8_t *values)
{
return 0;
}
static void qemu_s390_synchronize_stub(S390StAttribState *sa)
{
}
static int qemu_s390_get_stattr_stub(S390StAttribState *sa, uint64_t *start_gfn,
uint32_t count, uint8_t *values)
{
return 0;
}
static long long qemu_s390_get_dirtycount_stub(S390StAttribState *sa)
{
return 0;
}
static int qemu_s390_set_migrationmode_stub(S390StAttribState *sa, bool value)
{
return 0;
}
static int qemu_s390_get_active(S390StAttribState *sa)
{
return sa->migration_enabled;
}
static void qemu_s390_stattrib_class_init(ObjectClass *oc, void *data)
{
S390StAttribClass *sa_cl = S390_STATTRIB_CLASS(oc);
DeviceClass *dc = DEVICE_CLASS(oc);
sa_cl->synchronize = qemu_s390_synchronize_stub;
sa_cl->get_stattr = qemu_s390_get_stattr_stub;
sa_cl->set_stattr = qemu_s390_peek_stattr_stub;
sa_cl->peek_stattr = qemu_s390_peek_stattr_stub;
sa_cl->set_migrationmode = qemu_s390_set_migrationmode_stub;
sa_cl->get_dirtycount = qemu_s390_get_dirtycount_stub;
sa_cl->get_active = qemu_s390_get_active;
/* Reason: Can only be instantiated one time (internally) */
dc->user_creatable = false;
}
static const TypeInfo qemu_s390_stattrib_info = {
.name = TYPE_QEMU_S390_STATTRIB,
.parent = TYPE_S390_STATTRIB,
.instance_init = qemu_s390_stattrib_instance_init,
.instance_size = sizeof(QEMUS390StAttribState),
.class_init = qemu_s390_stattrib_class_init,
.class_size = sizeof(S390StAttribClass),
};
/* Generic abstract object: */
static void s390_stattrib_realize(DeviceState *dev, Error **errp)
{
bool ambiguous = false;
object_resolve_path_type("", TYPE_S390_STATTRIB, &ambiguous);
if (ambiguous) {
error_setg(errp, "storage_attributes device already exists");
}
}
static void s390_stattrib_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
dc->hotpluggable = false;
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
dc->realize = s390_stattrib_realize;
}
static inline bool s390_stattrib_get_migration_enabled(Object *obj,
Error **errp)
{
S390StAttribState *s = S390_STATTRIB(obj);
return s->migration_enabled;
}
static inline void s390_stattrib_set_migration_enabled(Object *obj, bool value,
Error **errp)
{
S390StAttribState *s = S390_STATTRIB(obj);
s->migration_enabled = value;
}
static SaveVMHandlers savevm_s390_stattrib_handlers = {
.save_setup = cmma_save_setup,
.save_live_iterate = cmma_save_iterate,
.save_live_complete_precopy = cmma_save_complete,
.save_live_pending = cmma_save_pending,
.save_cleanup = cmma_save_cleanup,
.load_state = cmma_load,
.is_active = cmma_active,
};
static void s390_stattrib_instance_init(Object *obj)
{
S390StAttribState *sas = S390_STATTRIB(obj);
register_savevm_live(TYPE_S390_STATTRIB, 0, 0,
&savevm_s390_stattrib_handlers, sas);
object_property_add_bool(obj, "migration-enabled",
s390_stattrib_get_migration_enabled,
qom: Drop parameter @errp of object_property_add() & friends The only way object_property_add() can fail is when a property with the same name already exists. Since our property names are all hardcoded, failure is a programming error, and the appropriate way to handle it is passing &error_abort. Same for its variants, except for object_property_add_child(), which additionally fails when the child already has a parent. Parentage is also under program control, so this is a programming error, too. We have a bit over 500 callers. Almost half of them pass &error_abort, slightly fewer ignore errors, one test case handles errors, and the remaining few callers pass them to their own callers. The previous few commits demonstrated once again that ignoring programming errors is a bad idea. Of the few ones that pass on errors, several violate the Error API. The Error ** argument must be NULL, &error_abort, &error_fatal, or a pointer to a variable containing NULL. Passing an argument of the latter kind twice without clearing it in between is wrong: if the first call sets an error, it no longer points to NULL for the second call. ich9_pm_add_properties(), sparc32_ledma_realize(), sparc32_dma_realize(), xilinx_axidma_realize(), xilinx_enet_realize() are wrong that way. When the one appropriate choice of argument is &error_abort, letting users pick the argument is a bad idea. Drop parameter @errp and assert the preconditions instead. There's one exception to "duplicate property name is a programming error": the way object_property_add() implements the magic (and undocumented) "automatic arrayification". Don't drop @errp there. Instead, rename object_property_add() to object_property_try_add(), and add the obvious wrapper object_property_add(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20200505152926.18877-15-armbru@redhat.com> [Two semantic rebase conflicts resolved]
2020-05-05 23:29:22 +08:00
s390_stattrib_set_migration_enabled);
object_property_set_bool(obj, true, "migration-enabled", NULL);
sas->migration_cur_gfn = 0;
}
static const TypeInfo s390_stattrib_info = {
.name = TYPE_S390_STATTRIB,
.parent = TYPE_DEVICE,
.instance_init = s390_stattrib_instance_init,
.instance_size = sizeof(S390StAttribState),
.class_init = s390_stattrib_class_init,
.class_size = sizeof(S390StAttribClass),
.abstract = true,
};
static void s390_stattrib_register_types(void)
{
type_register_static(&s390_stattrib_info);
type_register_static(&qemu_s390_stattrib_info);
}
type_init(s390_stattrib_register_types)