Provide a dump-skeys qmp command to allow the end user to dump storage keys. This is useful for debugging problems with guest storage key support within Qemu and for guest operating system developers. Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Eric Blake <eblake@redhat.com>
229 lines
6.4 KiB
C
229 lines
6.4 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 "hw/boards.h"
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#include "qmp-commands.h"
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#include "hw/s390x/storage-keys.h"
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#include "qemu/error-report.h"
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#define S390_SKEYS_BUFFER_SIZE 131072 /* Room for 128k storage keys */
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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(QEMUFile *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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const char *fmt = "page=%03" PRIx64 ": key(%d) => ACC=%X, FP=%d, REF=%d,"
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" ch=%d, reserved=%d\n";
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char buf[128];
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int len;
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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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len = snprintf(buf, sizeof(buf), fmt, curpage,
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*keys, acc, fp, ref, ch, res);
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assert(len < sizeof(buf));
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qemu_put_buffer(f, (uint8_t *)buf, len);
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keys++;
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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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QEMUFile *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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f = qemu_fopen(filename, "wb");
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if (!f) {
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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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qemu_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 "\n", start_gfn,
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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 "\n", start_gfn,
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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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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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}
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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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.instance_size = sizeof(S390SKeysClass),
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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_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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