405 lines
11 KiB
C
405 lines
11 KiB
C
/*
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* s390 storage attributes device
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*
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* Copyright 2016 IBM Corp.
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* Author(s): Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#include "qemu/osdep.h"
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#include "hw/boards.h"
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#include "qmp-commands.h"
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#include "migration/qemu-file.h"
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#include "migration/register.h"
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#include "hw/s390x/storage-attributes.h"
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#include "qemu/error-report.h"
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#include "sysemu/kvm.h"
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#include "exec/ram_addr.h"
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#include "qapi/error.h"
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#define CMMA_BLOCK_SIZE (1 << 10)
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#define STATTR_FLAG_EOS 0x01ULL
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#define STATTR_FLAG_MORE 0x02ULL
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#define STATTR_FLAG_ERROR 0x04ULL
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#define STATTR_FLAG_DONE 0x08ULL
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static S390StAttribState *s390_get_stattrib_device(void)
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{
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S390StAttribState *sas;
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sas = S390_STATTRIB(object_resolve_path_type("", TYPE_S390_STATTRIB, NULL));
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assert(sas);
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return sas;
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}
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void s390_stattrib_init(void)
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{
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Object *obj;
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obj = kvm_s390_stattrib_create();
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if (!obj) {
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obj = object_new(TYPE_QEMU_S390_STATTRIB);
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}
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object_property_add_child(qdev_get_machine(), TYPE_S390_STATTRIB,
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obj, NULL);
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object_unref(obj);
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qdev_init_nofail(DEVICE(obj));
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}
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/* Console commands: */
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void hmp_migrationmode(Monitor *mon, const QDict *qdict)
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{
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S390StAttribState *sas = s390_get_stattrib_device();
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S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
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uint64_t what = qdict_get_int(qdict, "mode");
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int r;
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r = sac->set_migrationmode(sas, what);
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if (r < 0) {
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monitor_printf(mon, "Error: %s", strerror(-r));
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}
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}
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void hmp_info_cmma(Monitor *mon, const QDict *qdict)
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{
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S390StAttribState *sas = s390_get_stattrib_device();
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S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
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uint64_t addr = qdict_get_int(qdict, "addr");
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uint64_t buflen = qdict_get_try_int(qdict, "count", 8);
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uint8_t *vals;
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int cx, len;
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vals = g_try_malloc(buflen);
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if (!vals) {
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monitor_printf(mon, "Error: %s\n", strerror(errno));
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return;
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}
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len = sac->peek_stattr(sas, addr / TARGET_PAGE_SIZE, buflen, vals);
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if (len < 0) {
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monitor_printf(mon, "Error: %s", strerror(-len));
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goto out;
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}
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monitor_printf(mon, " CMMA attributes, "
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"pages %" PRIu64 "+%d (0x%" PRIx64 "):\n",
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addr / TARGET_PAGE_SIZE, len, addr & ~TARGET_PAGE_MASK);
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for (cx = 0; cx < len; cx++) {
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if (cx % 8 == 7) {
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monitor_printf(mon, "%02x\n", vals[cx]);
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} else {
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monitor_printf(mon, "%02x", vals[cx]);
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}
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}
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monitor_printf(mon, "\n");
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out:
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g_free(vals);
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}
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/* Migration support: */
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static int cmma_load(QEMUFile *f, void *opaque, int version_id)
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{
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S390StAttribState *sas = S390_STATTRIB(opaque);
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S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
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uint64_t count, cur_gfn;
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int flags, ret = 0;
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ram_addr_t addr;
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uint8_t *buf;
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while (!ret) {
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addr = qemu_get_be64(f);
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flags = addr & ~TARGET_PAGE_MASK;
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addr &= TARGET_PAGE_MASK;
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switch (flags) {
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case STATTR_FLAG_MORE: {
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cur_gfn = addr / TARGET_PAGE_SIZE;
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count = qemu_get_be64(f);
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buf = g_try_malloc(count);
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if (!buf) {
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error_report("cmma_load could not allocate memory");
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ret = -ENOMEM;
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break;
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}
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qemu_get_buffer(f, buf, count);
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ret = sac->set_stattr(sas, cur_gfn, count, buf);
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if (ret < 0) {
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error_report("Error %d while setting storage attributes", ret);
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}
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g_free(buf);
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break;
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}
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case STATTR_FLAG_ERROR: {
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error_report("Storage attributes data is incomplete");
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ret = -EINVAL;
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break;
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}
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case STATTR_FLAG_DONE:
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/* This is after the last pre-copied value has been sent, nothing
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* more will be sent after this. Pre-copy has finished, and we
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* are done flushing all the remaining values. Now the target
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* system is about to take over. We synchronize the buffer to
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* apply the actual correct values where needed.
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*/
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sac->synchronize(sas);
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break;
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case STATTR_FLAG_EOS:
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/* Normal exit */
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return 0;
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default:
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error_report("Unexpected storage attribute flag data: %#x", flags);
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ret = -EINVAL;
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}
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}
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return ret;
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}
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static int cmma_save_setup(QEMUFile *f, void *opaque)
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{
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S390StAttribState *sas = S390_STATTRIB(opaque);
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S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
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int res;
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/*
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* Signal that we want to start a migration, thus needing PGSTE dirty
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* tracking.
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*/
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res = sac->set_migrationmode(sas, 1);
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if (res) {
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return res;
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}
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qemu_put_be64(f, STATTR_FLAG_EOS);
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return 0;
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}
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static void cmma_save_pending(QEMUFile *f, void *opaque, uint64_t max_size,
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uint64_t *non_postcopiable_pending,
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uint64_t *postcopiable_pending)
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{
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S390StAttribState *sas = S390_STATTRIB(opaque);
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S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
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long long res = sac->get_dirtycount(sas);
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if (res >= 0) {
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*non_postcopiable_pending += res;
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}
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}
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static int cmma_save(QEMUFile *f, void *opaque, int final)
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{
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S390StAttribState *sas = S390_STATTRIB(opaque);
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S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
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uint8_t *buf;
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int r, cx, reallen = 0, ret = 0;
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uint32_t buflen = 1 << 19; /* 512kB cover 2GB of guest memory */
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uint64_t start_gfn = sas->migration_cur_gfn;
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buf = g_try_malloc(buflen);
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if (!buf) {
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error_report("Could not allocate memory to save storage attributes");
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return -ENOMEM;
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}
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while (final ? 1 : qemu_file_rate_limit(f) == 0) {
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reallen = sac->get_stattr(sas, &start_gfn, buflen, buf);
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if (reallen < 0) {
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g_free(buf);
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return reallen;
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}
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ret = 1;
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if (!reallen) {
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break;
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}
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qemu_put_be64(f, (start_gfn << TARGET_PAGE_BITS) | STATTR_FLAG_MORE);
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qemu_put_be64(f, reallen);
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for (cx = 0; cx < reallen; cx++) {
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qemu_put_byte(f, buf[cx]);
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}
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if (!sac->get_dirtycount(sas)) {
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break;
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}
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}
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sas->migration_cur_gfn = start_gfn + reallen;
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g_free(buf);
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if (final) {
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qemu_put_be64(f, STATTR_FLAG_DONE);
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}
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qemu_put_be64(f, STATTR_FLAG_EOS);
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r = qemu_file_get_error(f);
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if (r < 0) {
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return r;
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}
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return ret;
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}
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static int cmma_save_iterate(QEMUFile *f, void *opaque)
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{
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return cmma_save(f, opaque, 0);
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}
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static int cmma_save_complete(QEMUFile *f, void *opaque)
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{
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return cmma_save(f, opaque, 1);
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}
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static void cmma_save_cleanup(void *opaque)
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{
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S390StAttribState *sas = S390_STATTRIB(opaque);
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S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
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sac->set_migrationmode(sas, 0);
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}
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static bool cmma_active(void *opaque)
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{
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S390StAttribState *sas = S390_STATTRIB(opaque);
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S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
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return sac->get_active(sas);
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}
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/* QEMU object: */
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static void qemu_s390_stattrib_instance_init(Object *obj)
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{
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}
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static int qemu_s390_peek_stattr_stub(S390StAttribState *sa, uint64_t start_gfn,
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uint32_t count, uint8_t *values)
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{
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return 0;
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}
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static void qemu_s390_synchronize_stub(S390StAttribState *sa)
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{
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}
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static int qemu_s390_get_stattr_stub(S390StAttribState *sa, uint64_t *start_gfn,
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uint32_t count, uint8_t *values)
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{
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return 0;
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}
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static long long qemu_s390_get_dirtycount_stub(S390StAttribState *sa)
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{
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return 0;
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}
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static int qemu_s390_set_migrationmode_stub(S390StAttribState *sa, bool value)
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{
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return 0;
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}
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static int qemu_s390_get_active(S390StAttribState *sa)
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{
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return sa->migration_enabled;
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}
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static void qemu_s390_stattrib_class_init(ObjectClass *oc, void *data)
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{
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S390StAttribClass *sa_cl = S390_STATTRIB_CLASS(oc);
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sa_cl->synchronize = qemu_s390_synchronize_stub;
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sa_cl->get_stattr = qemu_s390_get_stattr_stub;
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sa_cl->set_stattr = qemu_s390_peek_stattr_stub;
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sa_cl->peek_stattr = qemu_s390_peek_stattr_stub;
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sa_cl->set_migrationmode = qemu_s390_set_migrationmode_stub;
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sa_cl->get_dirtycount = qemu_s390_get_dirtycount_stub;
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sa_cl->get_active = qemu_s390_get_active;
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}
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static const TypeInfo qemu_s390_stattrib_info = {
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.name = TYPE_QEMU_S390_STATTRIB,
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.parent = TYPE_S390_STATTRIB,
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.instance_init = qemu_s390_stattrib_instance_init,
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.instance_size = sizeof(QEMUS390StAttribState),
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.class_init = qemu_s390_stattrib_class_init,
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.class_size = sizeof(S390StAttribClass),
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};
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/* Generic abstract object: */
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static void s390_stattrib_realize(DeviceState *dev, Error **errp)
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{
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bool ambiguous = false;
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object_resolve_path_type("", TYPE_S390_STATTRIB, &ambiguous);
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if (ambiguous) {
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error_setg(errp, "storage_attributes device already exists");
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}
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}
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static void s390_stattrib_class_init(ObjectClass *oc, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(oc);
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dc->hotpluggable = false;
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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dc->realize = s390_stattrib_realize;
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}
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static inline bool s390_stattrib_get_migration_enabled(Object *obj, Error **e)
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{
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S390StAttribState *s = S390_STATTRIB(obj);
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return s->migration_enabled;
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}
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static inline void s390_stattrib_set_migration_enabled(Object *obj, bool value,
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Error **errp)
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{
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S390StAttribState *s = S390_STATTRIB(obj);
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s->migration_enabled = value;
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}
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static void s390_stattrib_instance_init(Object *obj)
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{
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S390StAttribState *sas = S390_STATTRIB(obj);
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SaveVMHandlers *ops;
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/* ops will always be freed by qemu when unregistering */
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ops = g_new0(SaveVMHandlers, 1);
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ops->save_setup = cmma_save_setup;
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ops->save_live_iterate = cmma_save_iterate;
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ops->save_live_complete_precopy = cmma_save_complete;
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ops->save_live_pending = cmma_save_pending;
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ops->save_cleanup = cmma_save_cleanup;
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ops->load_state = cmma_load;
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ops->is_active = cmma_active;
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register_savevm_live(NULL, TYPE_S390_STATTRIB, 0, 0, ops, sas);
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object_property_add_bool(obj, "migration-enabled",
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s390_stattrib_get_migration_enabled,
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s390_stattrib_set_migration_enabled, NULL);
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object_property_set_bool(obj, true, "migration-enabled", NULL);
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sas->migration_cur_gfn = 0;
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}
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static const TypeInfo s390_stattrib_info = {
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.name = TYPE_S390_STATTRIB,
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.parent = TYPE_DEVICE,
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.instance_init = s390_stattrib_instance_init,
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.instance_size = sizeof(S390StAttribState),
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.class_init = s390_stattrib_class_init,
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.class_size = sizeof(S390StAttribClass),
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.abstract = true,
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};
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static void s390_stattrib_register_types(void)
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{
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type_register_static(&s390_stattrib_info);
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type_register_static(&qemu_s390_stattrib_info);
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}
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type_init(s390_stattrib_register_types)
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