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]
432 lines
12 KiB
C
432 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 "qemu/units.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-target.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/qemu-file-types.h"
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#include "migration/register.h"
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#define S390_SKEYS_BUFFER_SIZE (128 * KiB) /* 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);
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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->ram_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(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(VMSTATE_IF(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);
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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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