430 lines
12 KiB
C
430 lines
12 KiB
C
/*
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* s390 storage key device
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*
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* Copyright 2015 IBM Corp.
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* Author(s): Jason J. Herne <jjherne@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 "hw/s390x/storage-keys.h"
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#include "qapi/error.h"
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#include "qapi/qapi-commands-misc.h"
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#include "qapi/qmp/qdict.h"
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#include "qemu/error-report.h"
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#include "sysemu/kvm.h"
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#include "migration/register.h"
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#define S390_SKEYS_BUFFER_SIZE 131072 /* Room for 128k storage keys */
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#define S390_SKEYS_SAVE_FLAG_EOS 0x01
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#define S390_SKEYS_SAVE_FLAG_SKEYS 0x02
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#define S390_SKEYS_SAVE_FLAG_ERROR 0x04
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S390SKeysState *s390_get_skeys_device(void)
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{
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S390SKeysState *ss;
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ss = S390_SKEYS(object_resolve_path_type("", TYPE_S390_SKEYS, NULL));
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assert(ss);
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return ss;
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}
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void s390_skeys_init(void)
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{
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Object *obj;
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if (kvm_enabled()) {
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obj = object_new(TYPE_KVM_S390_SKEYS);
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} else {
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obj = object_new(TYPE_QEMU_S390_SKEYS);
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}
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object_property_add_child(qdev_get_machine(), TYPE_S390_SKEYS,
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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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static void write_keys(FILE *f, uint8_t *keys, uint64_t startgfn,
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uint64_t count, Error **errp)
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{
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uint64_t curpage = startgfn;
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uint64_t maxpage = curpage + count - 1;
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for (; curpage <= maxpage; curpage++) {
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uint8_t acc = (*keys & 0xF0) >> 4;
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int fp = (*keys & 0x08);
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int ref = (*keys & 0x04);
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int ch = (*keys & 0x02);
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int res = (*keys & 0x01);
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fprintf(f, "page=%03" PRIx64 ": key(%d) => ACC=%X, FP=%d, REF=%d,"
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" ch=%d, reserved=%d\n",
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curpage, *keys, acc, fp, ref, ch, res);
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keys++;
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}
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}
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void hmp_info_skeys(Monitor *mon, const QDict *qdict)
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{
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S390SKeysState *ss = s390_get_skeys_device();
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S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
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uint64_t addr = qdict_get_int(qdict, "addr");
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uint8_t key;
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int r;
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/* Quick check to see if guest is using storage keys*/
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if (!skeyclass->skeys_enabled(ss)) {
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monitor_printf(mon, "Error: This guest is not using storage keys\n");
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return;
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}
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r = skeyclass->get_skeys(ss, addr / TARGET_PAGE_SIZE, 1, &key);
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if (r < 0) {
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monitor_printf(mon, "Error: %s\n", strerror(-r));
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return;
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}
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monitor_printf(mon, " key: 0x%X\n", key);
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}
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void hmp_dump_skeys(Monitor *mon, const QDict *qdict)
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{
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const char *filename = qdict_get_str(qdict, "filename");
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Error *err = NULL;
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qmp_dump_skeys(filename, &err);
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if (err) {
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error_report_err(err);
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}
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}
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void qmp_dump_skeys(const char *filename, Error **errp)
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{
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S390SKeysState *ss = s390_get_skeys_device();
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S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
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const uint64_t total_count = ram_size / TARGET_PAGE_SIZE;
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uint64_t handled_count = 0, cur_count;
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Error *lerr = NULL;
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vaddr cur_gfn = 0;
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uint8_t *buf;
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int ret;
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int fd;
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FILE *f;
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/* Quick check to see if guest is using storage keys*/
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if (!skeyclass->skeys_enabled(ss)) {
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error_setg(errp, "This guest is not using storage keys - "
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"nothing to dump");
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return;
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}
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fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
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if (fd < 0) {
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error_setg_file_open(errp, errno, filename);
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return;
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}
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f = fdopen(fd, "wb");
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if (!f) {
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close(fd);
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error_setg_file_open(errp, errno, filename);
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return;
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}
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buf = g_try_malloc(S390_SKEYS_BUFFER_SIZE);
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if (!buf) {
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error_setg(errp, "Could not allocate memory");
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goto out;
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}
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/* we'll only dump initial memory for now */
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while (handled_count < total_count) {
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/* Calculate how many keys to ask for & handle overflow case */
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cur_count = MIN(total_count - handled_count, S390_SKEYS_BUFFER_SIZE);
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ret = skeyclass->get_skeys(ss, cur_gfn, cur_count, buf);
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if (ret < 0) {
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error_setg(errp, "get_keys error %d", ret);
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goto out_free;
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}
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/* write keys to stream */
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write_keys(f, buf, cur_gfn, cur_count, &lerr);
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if (lerr) {
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goto out_free;
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}
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cur_gfn += cur_count;
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handled_count += cur_count;
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}
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out_free:
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error_propagate(errp, lerr);
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g_free(buf);
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out:
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fclose(f);
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}
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static void qemu_s390_skeys_init(Object *obj)
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{
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QEMUS390SKeysState *skeys = QEMU_S390_SKEYS(obj);
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MachineState *machine = MACHINE(qdev_get_machine());
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skeys->key_count = machine->maxram_size / TARGET_PAGE_SIZE;
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skeys->keydata = g_malloc0(skeys->key_count);
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}
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static int qemu_s390_skeys_enabled(S390SKeysState *ss)
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{
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return 1;
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}
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/*
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* TODO: for memory hotplug support qemu_s390_skeys_set and qemu_s390_skeys_get
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* will have to make sure that the given gfn belongs to a memory region and not
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* a memory hole.
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*/
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static int qemu_s390_skeys_set(S390SKeysState *ss, uint64_t start_gfn,
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uint64_t count, uint8_t *keys)
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{
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QEMUS390SKeysState *skeydev = QEMU_S390_SKEYS(ss);
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int i;
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/* Check for uint64 overflow and access beyond end of key data */
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if (start_gfn + count > skeydev->key_count || start_gfn + count < count) {
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error_report("Error: Setting storage keys for page beyond the end "
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"of memory: gfn=%" PRIx64 " count=%" PRId64,
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start_gfn, count);
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return -EINVAL;
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}
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for (i = 0; i < count; i++) {
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skeydev->keydata[start_gfn + i] = keys[i];
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}
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return 0;
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}
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static int qemu_s390_skeys_get(S390SKeysState *ss, uint64_t start_gfn,
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uint64_t count, uint8_t *keys)
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{
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QEMUS390SKeysState *skeydev = QEMU_S390_SKEYS(ss);
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int i;
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/* Check for uint64 overflow and access beyond end of key data */
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if (start_gfn + count > skeydev->key_count || start_gfn + count < count) {
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error_report("Error: Getting storage keys for page beyond the end "
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"of memory: gfn=%" PRIx64 " count=%" PRId64,
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start_gfn, count);
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return -EINVAL;
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}
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for (i = 0; i < count; i++) {
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keys[i] = skeydev->keydata[start_gfn + i];
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}
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return 0;
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}
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static void qemu_s390_skeys_class_init(ObjectClass *oc, void *data)
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{
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S390SKeysClass *skeyclass = S390_SKEYS_CLASS(oc);
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DeviceClass *dc = DEVICE_CLASS(oc);
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skeyclass->skeys_enabled = qemu_s390_skeys_enabled;
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skeyclass->get_skeys = qemu_s390_skeys_get;
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skeyclass->set_skeys = qemu_s390_skeys_set;
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/* Reason: Internal device (only one skeys device for the whole memory) */
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dc->user_creatable = false;
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}
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static const TypeInfo qemu_s390_skeys_info = {
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.name = TYPE_QEMU_S390_SKEYS,
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.parent = TYPE_S390_SKEYS,
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.instance_init = qemu_s390_skeys_init,
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.instance_size = sizeof(QEMUS390SKeysState),
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.class_init = qemu_s390_skeys_class_init,
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.class_size = sizeof(S390SKeysClass),
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};
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static void s390_storage_keys_save(QEMUFile *f, void *opaque)
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{
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S390SKeysState *ss = S390_SKEYS(opaque);
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S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
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uint64_t pages_left = ram_size / TARGET_PAGE_SIZE;
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uint64_t read_count, eos = S390_SKEYS_SAVE_FLAG_EOS;
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vaddr cur_gfn = 0;
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int error = 0;
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uint8_t *buf;
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if (!skeyclass->skeys_enabled(ss)) {
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goto end_stream;
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}
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buf = g_try_malloc(S390_SKEYS_BUFFER_SIZE);
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if (!buf) {
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error_report("storage key save could not allocate memory");
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goto end_stream;
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}
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/* We only support initial memory. Standby memory is not handled yet. */
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qemu_put_be64(f, (cur_gfn * TARGET_PAGE_SIZE) | S390_SKEYS_SAVE_FLAG_SKEYS);
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qemu_put_be64(f, pages_left);
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while (pages_left) {
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read_count = MIN(pages_left, S390_SKEYS_BUFFER_SIZE);
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if (!error) {
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error = skeyclass->get_skeys(ss, cur_gfn, read_count, buf);
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if (error) {
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/*
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* If error: we want to fill the stream with valid data instead
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* of stopping early so we pad the stream with 0x00 values and
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* use S390_SKEYS_SAVE_FLAG_ERROR to indicate failure to the
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* reading side.
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*/
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error_report("S390_GET_KEYS error %d", error);
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memset(buf, 0, S390_SKEYS_BUFFER_SIZE);
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eos = S390_SKEYS_SAVE_FLAG_ERROR;
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}
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}
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qemu_put_buffer(f, buf, read_count);
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cur_gfn += read_count;
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pages_left -= read_count;
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}
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g_free(buf);
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end_stream:
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qemu_put_be64(f, eos);
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}
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static int s390_storage_keys_load(QEMUFile *f, void *opaque, int version_id)
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{
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S390SKeysState *ss = S390_SKEYS(opaque);
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S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
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int ret = 0;
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while (!ret) {
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ram_addr_t addr;
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int flags;
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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 S390_SKEYS_SAVE_FLAG_SKEYS: {
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const uint64_t total_count = qemu_get_be64(f);
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uint64_t handled_count = 0, cur_count;
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uint64_t cur_gfn = addr / TARGET_PAGE_SIZE;
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uint8_t *buf = g_try_malloc(S390_SKEYS_BUFFER_SIZE);
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if (!buf) {
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error_report("storage key load could not allocate memory");
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ret = -ENOMEM;
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break;
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}
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while (handled_count < total_count) {
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cur_count = MIN(total_count - handled_count,
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S390_SKEYS_BUFFER_SIZE);
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qemu_get_buffer(f, buf, cur_count);
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ret = skeyclass->set_skeys(ss, cur_gfn, cur_count, buf);
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if (ret < 0) {
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error_report("S390_SET_KEYS error %d", ret);
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break;
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}
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handled_count += cur_count;
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cur_gfn += cur_count;
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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 S390_SKEYS_SAVE_FLAG_ERROR: {
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error_report("Storage key data is incomplete");
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ret = -EINVAL;
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break;
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}
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case S390_SKEYS_SAVE_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 key 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 inline bool s390_skeys_get_migration_enabled(Object *obj, Error **errp)
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{
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S390SKeysState *ss = S390_SKEYS(obj);
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return ss->migration_enabled;
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}
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static SaveVMHandlers savevm_s390_storage_keys = {
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.save_state = s390_storage_keys_save,
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.load_state = s390_storage_keys_load,
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};
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static inline void s390_skeys_set_migration_enabled(Object *obj, bool value,
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Error **errp)
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{
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S390SKeysState *ss = S390_SKEYS(obj);
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/* Prevent double registration of savevm handler */
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if (ss->migration_enabled == value) {
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return;
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}
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ss->migration_enabled = value;
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if (ss->migration_enabled) {
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register_savevm_live(NULL, TYPE_S390_SKEYS, 0, 1,
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&savevm_s390_storage_keys, ss);
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} else {
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unregister_savevm(DEVICE(ss), TYPE_S390_SKEYS, ss);
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}
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}
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static void s390_skeys_instance_init(Object *obj)
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{
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object_property_add_bool(obj, "migration-enabled",
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s390_skeys_get_migration_enabled,
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s390_skeys_set_migration_enabled, NULL);
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object_property_set_bool(obj, true, "migration-enabled", NULL);
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}
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static void s390_skeys_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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}
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static const TypeInfo s390_skeys_info = {
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.name = TYPE_S390_SKEYS,
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.parent = TYPE_DEVICE,
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.instance_init = s390_skeys_instance_init,
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.instance_size = sizeof(S390SKeysState),
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.class_init = s390_skeys_class_init,
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.class_size = sizeof(S390SKeysClass),
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.abstract = true,
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};
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static void qemu_s390_skeys_register_types(void)
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{
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type_register_static(&s390_skeys_info);
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type_register_static(&qemu_s390_skeys_info);
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}
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type_init(qemu_s390_skeys_register_types)
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