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migration: Enable TLS for preempt channel

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This patch is based on the async preempt channel creation.  It continues
wiring up the new channel with TLS handshake to destionation when enabled.

Note that only the src QEMU needs such operation; the dest QEMU does not
need any change for TLS support due to the fact that all channels are
established synchronously there, so all the TLS magic is already properly
handled by migration_tls_channel_process_incoming().

Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20220707185518.27529-1-peterx@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Peter Xu 2022-07-07 14:55:18 -04:00 committed by Dr. David Alan Gilbert
parent 9a26662752
commit f0afaf6ce4
2 changed files with 50 additions and 8 deletions
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57
migration/postcopy-ram.c
View file

@ -36,6 +36,7 @@
#include "socket.h"
#include "qemu-file.h"
#include "yank_functions.h"
#include "tls.h"
/* Arbitrary limit on size of each discard command,
* keeps them around ~200 bytes
@ -1552,15 +1553,15 @@ bool postcopy_preempt_new_channel(MigrationIncomingState *mis, QEMUFile *file)
return true;
}
/*
* Setup the postcopy preempt channel with the IOC. If ERROR is specified,
* setup the error instead. This helper will free the ERROR if specified.
*/
static void
postcopy_preempt_send_channel_new(QIOTask *task, gpointer opaque)
postcopy_preempt_send_channel_done(MigrationState *s,
QIOChannel *ioc, Error *local_err)
{
MigrationState *s = opaque;
QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task));
Error *local_err = NULL;
if (qio_task_propagate_error(task, &local_err)) {
/* Something wrong happened.. */
if (local_err) {
migrate_set_error(s, local_err);
error_free(local_err);
} else {
@ -1574,7 +1575,47 @@ postcopy_preempt_send_channel_new(QIOTask *task, gpointer opaque)
* postcopy_qemufile_src to know whether it failed or not.
*/
qemu_sem_post(&s->postcopy_qemufile_src_sem);
object_unref(OBJECT(ioc));
}
static void
postcopy_preempt_tls_handshake(QIOTask *task, gpointer opaque)
{
g_autoptr(QIOChannel) ioc = QIO_CHANNEL(qio_task_get_source(task));
MigrationState *s = opaque;
Error *local_err = NULL;
qio_task_propagate_error(task, &local_err);
postcopy_preempt_send_channel_done(s, ioc, local_err);
}
static void
postcopy_preempt_send_channel_new(QIOTask *task, gpointer opaque)
{
g_autoptr(QIOChannel) ioc = QIO_CHANNEL(qio_task_get_source(task));
MigrationState *s = opaque;
QIOChannelTLS *tioc;
Error *local_err = NULL;
if (qio_task_propagate_error(task, &local_err)) {
goto out;
}
if (migrate_channel_requires_tls_upgrade(ioc)) {
tioc = migration_tls_client_create(s, ioc, s->hostname, &local_err);
if (!tioc) {
goto out;
}
trace_postcopy_preempt_tls_handshake();
qio_channel_set_name(QIO_CHANNEL(tioc), "migration-tls-preempt");
qio_channel_tls_handshake(tioc, postcopy_preempt_tls_handshake,
s, NULL, NULL);
/* Setup the channel until TLS handshake finished */
return;
}
out:
/* This handles both good and error cases */
postcopy_preempt_send_channel_done(s, ioc, local_err);
}
/* Returns 0 if channel established, -1 for error. */

1
migration/trace-events
View file

@ -287,6 +287,7 @@ postcopy_request_shared_page(const char *sharer, const char *rb, uint64_t rb_off
postcopy_request_shared_page_present(const char *sharer, const char *rb, uint64_t rb_offset) "%s already %s offset 0x%"PRIx64
postcopy_wake_shared(uint64_t client_addr, const char *rb) "at 0x%"PRIx64" in %s"
postcopy_page_req_del(void *addr, int count) "resolved page req %p total %d"
postcopy_preempt_tls_handshake(void) ""
postcopy_preempt_new_channel(void) ""
postcopy_preempt_thread_entry(void) ""
postcopy_preempt_thread_exit(void) ""