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4f8cf323e8
migration_channel_read_peek() calls qio_channel_readv_full() and handles
both cases of return value == 0 and return value < 0 the same way, by
calling error_setg() with errp. However, if return value < 0, errp is
already set, so calling error_setg() with errp will lead to an assert.
Fix it by handling these cases separately, calling error_setg() with
errp only in return value == 0 case.
Fixes: 6720c2b327 ("migration: check magic value for deciding the mapping of channels")
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Link: https://lore.kernel.org/r/20231231093016.14204-10-avihaih@nvidia.com
Signed-off-by: Peter Xu <peterx@redhat.com>
143 lines
3.8 KiB
C
143 lines
3.8 KiB
C
/*
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* QEMU live migration channel operations
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*
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* Copyright Red Hat, Inc. 2016
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*
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* Authors:
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* Daniel P. Berrange <berrange@redhat.com>
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu/osdep.h"
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#include "channel.h"
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#include "tls.h"
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#include "migration.h"
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#include "qemu-file.h"
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#include "trace.h"
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#include "qapi/error.h"
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#include "io/channel-tls.h"
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#include "io/channel-socket.h"
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#include "qemu/yank.h"
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#include "yank_functions.h"
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/**
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* @migration_channel_process_incoming - Create new incoming migration channel
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*
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* Notice that TLS is special. For it we listen in a listener socket,
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* and then create a new client socket from the TLS library.
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*
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* @ioc: Channel to which we are connecting
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*/
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void migration_channel_process_incoming(QIOChannel *ioc)
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{
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MigrationState *s = migrate_get_current();
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Error *local_err = NULL;
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trace_migration_set_incoming_channel(
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ioc, object_get_typename(OBJECT(ioc)));
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if (migrate_channel_requires_tls_upgrade(ioc)) {
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migration_tls_channel_process_incoming(s, ioc, &local_err);
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} else {
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migration_ioc_register_yank(ioc);
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migration_ioc_process_incoming(ioc, &local_err);
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}
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if (local_err) {
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error_report_err(local_err);
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}
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}
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/**
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* @migration_channel_connect - Create new outgoing migration channel
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*
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* @s: Current migration state
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* @ioc: Channel to which we are connecting
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* @hostname: Where we want to connect
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* @error: Error indicating failure to connect, free'd here
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*/
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void migration_channel_connect(MigrationState *s,
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QIOChannel *ioc,
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const char *hostname,
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Error *error)
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{
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trace_migration_set_outgoing_channel(
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ioc, object_get_typename(OBJECT(ioc)), hostname, error);
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if (!error) {
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if (migrate_channel_requires_tls_upgrade(ioc)) {
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migration_tls_channel_connect(s, ioc, hostname, &error);
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if (!error) {
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/* tls_channel_connect will call back to this
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* function after the TLS handshake,
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* so we mustn't call migrate_fd_connect until then
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*/
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return;
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}
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} else {
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QEMUFile *f = qemu_file_new_output(ioc);
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migration_ioc_register_yank(ioc);
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qemu_mutex_lock(&s->qemu_file_lock);
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s->to_dst_file = f;
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qemu_mutex_unlock(&s->qemu_file_lock);
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}
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}
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migrate_fd_connect(s, error);
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error_free(error);
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}
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/**
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* @migration_channel_read_peek - Peek at migration channel, without
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* actually removing it from channel buffer.
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*
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* @ioc: the channel object
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* @buf: the memory region to read data into
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* @buflen: the number of bytes to read in @buf
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* @errp: pointer to a NULL-initialized error object
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*
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* Returns 0 if successful, returns -1 and sets @errp if fails.
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*/
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int migration_channel_read_peek(QIOChannel *ioc,
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const char *buf,
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const size_t buflen,
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Error **errp)
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{
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ssize_t len = 0;
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struct iovec iov = { .iov_base = (char *)buf, .iov_len = buflen };
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while (true) {
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len = qio_channel_readv_full(ioc, &iov, 1, NULL, NULL,
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QIO_CHANNEL_READ_FLAG_MSG_PEEK, errp);
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if (len < 0 && len != QIO_CHANNEL_ERR_BLOCK) {
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return -1;
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}
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if (len == 0) {
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error_setg(errp, "Failed to peek at channel");
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return -1;
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}
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if (len == buflen) {
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break;
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}
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/* 1ms sleep. */
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if (qemu_in_coroutine()) {
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qemu_co_sleep_ns(QEMU_CLOCK_REALTIME, 1000000);
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} else {
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g_usleep(1000);
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}
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}
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return 0;
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}
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