[PULL 00/29] Migration pull patches (second try)

[PULL 00/29] Migration pull patches (second try)

[Juan Quintela]

The following changes since commit 3c8a6575985b1652b45bfa670b5e1907d642cfa0:

  Merge remote-tracking branch 'remotes/kraxel/tags/usb-20200113-pull-request' into staging (2020-01-13 14:19:57 +0000)

are available in the Git repository at:

  https://github.com/juanquintela/qemu.git tags/migration-pull-pull-request

for you to fetch changes up to 4eafab585c091050b5ae63130f46fe46ac919c3a:

  migration: Support QLIST migration (2020-01-14 10:17:12 +0100)

----------------------------------------------------------------
Migration pull request
- updated QList patch
- initialize local msg variable

----------------------------------------------------------------

Alexey Romko (1):
  Bug #1829242 correction.

Daniel Henrique Barboza (1):
  ram.c: remove unneeded labels

Dr. David Alan Gilbert (1):
  migration: Rate limit inside host pages

Eric Auger (1):
  migration: Support QLIST migration

Fangrui Song (1):
  migration: Fix incorrect integer->float conversion caught by clang

Jiahui Cen (2):
  migration/multifd: fix nullptr access in terminating multifd threads
  migration/multifd: fix destroyed mutex access in terminating multifd
    threads

Juan Quintela (4):
  multifd: Initialize local variable
  migration-test: Add migration multifd test
  migration: Make sure that we don't call write() in case of error
  migration-test: introduce functions to handle string parameters

Laurent Vivier (2):
  migration-test: ppc64: fix FORTH test program
  runstate: ignore finishmigrate -> prelaunch transition

Marc-André Lureau (1):
  misc: use QEMU_IS_ALIGNED

Peter Xu (3):
  migration: Define VMSTATE_INSTANCE_ID_ANY
  migration: Change SaveStateEntry.instance_id into uint32_t
  apic: Use 32bit APIC ID for migration instance ID

Scott Cheloha (2):
  migration: add savevm_state_handler_remove()
  migration: savevm_state_handler_insert: constant-time element
    insertion

Wei Yang (8):
  migration/postcopy: reduce memset when it is zero page and
    matches_target_page_size
  migration/postcopy: wait for decompress thread in precopy
  migration/postcopy: count target page number to decide the
    place_needed
  migration/postcopy: set all_zero to true on the first target page
  migration/postcopy: enable random order target page arrival
  migration/postcopy: enable compress during postcopy
  migration/multifd: clean pages after filling packet
  migration/multifd: not use multifd during postcopy

Yury Kotov (2):
  migration: Fix the re-run check of the migrate-incoming command
  migration/ram: Yield periodically to the main loop

 backends/dbus-vmstate.c      |   3 +-
 exec.c                       |   4 +-
 hw/arm/stellaris.c           |   2 +-
 hw/core/qdev.c               |   3 +-
 hw/display/ads7846.c         |   2 +-
 hw/i2c/core.c                |   2 +-
 hw/input/stellaris_input.c   |   3 +-
 hw/intc/apic_common.c        |   7 +-
 hw/misc/max111x.c            |   3 +-
 hw/net/eepro100.c            |   3 +-
 hw/pci/pci.c                 |   2 +-
 hw/ppc/spapr.c               |   2 +-
 hw/timer/arm_timer.c         |   2 +-
 hw/tpm/tpm_emulator.c        |   3 +-
 include/migration/register.h |   2 +-
 include/migration/vmstate.h  |  25 ++++-
 include/qemu/queue.h         |  39 ++++++++
 migration/migration.c        |  72 +++++++-------
 migration/migration.h        |   1 +
 migration/ram.c              | 183 ++++++++++++++++++++++++++---------
 migration/savevm.c           |  61 ++++++++----
 migration/trace-events       |   9 +-
 migration/vmstate-types.c    |  70 ++++++++++++++
 stubs/vmstate.c              |   2 +-
 tests/qtest/migration-test.c |  97 ++++++++++++++++++-
 tests/test-vmstate.c         | 170 ++++++++++++++++++++++++++++++++
 vl.c                         |  10 +-
 27 files changed, 653 insertions(+), 129 deletions(-)

-- 
2.24.1

[PULL 01/29] multifd: Initialize local variable

[Juan Quintela]

Fill everything with zero, so the padding fields are also initialized.
---
 migration/ram.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/migration/ram.c b/migration/ram.c
index 96feb4062c..b9147bcca3 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -703,7 +703,7 @@ typedef struct {
 
 static int multifd_send_initial_packet(MultiFDSendParams *p, Error **errp)
 {
-    MultiFDInit_t msg;
+    MultiFDInit_t msg = {};
     int ret;
 
     msg.magic = cpu_to_be32(MULTIFD_MAGIC);
-- 
2.24.1

[PULL 02/29] migration-test: Add migration multifd test

[Juan Quintela]

We set multifd-channels.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Tested-by: Wei Yang <richardw.yang@linux.intel.com>
---
 tests/qtest/migration-test.c | 56 ++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
index 53afec4395..fb70214f44 100644
--- a/tests/qtest/migration-test.c
+++ b/tests/qtest/migration-test.c
@@ -1202,6 +1202,61 @@ static void test_migrate_auto_converge(void)
     test_migrate_end(from, to, true);
 }
 
+static void test_multifd_tcp(void)
+{
+    MigrateStart *args = migrate_start_new();
+    QTestState *from, *to;
+    QDict *rsp;
+    char *uri;
+
+    if (test_migrate_start(&from, &to, "defer", args)) {
+        return;
+    }
+
+    /*
+     * We want to pick a speed slow enough that the test completes
+     * quickly, but that it doesn't complete precopy even on a slow
+     * machine, so also set the downtime.
+     */
+    /* 1 ms should make it not converge*/
+    migrate_set_parameter_int(from, "downtime-limit", 1);
+    /* 1GB/s */
+    migrate_set_parameter_int(from, "max-bandwidth", 1000000000);
+
+    migrate_set_parameter_int(from, "multifd-channels", 16);
+    migrate_set_parameter_int(to, "multifd-channels", 16);
+
+    migrate_set_capability(from, "multifd", "true");
+    migrate_set_capability(to, "multifd", "true");
+
+    /* Start incoming migration from the 1st socket */
+    rsp = wait_command(to, "{ 'execute': 'migrate-incoming',"
+                           "  'arguments': { 'uri': 'tcp:127.0.0.1:0' }}");
+    qobject_unref(rsp);
+
+    /* Wait for the first serial output from the source */
+    wait_for_serial("src_serial");
+
+    uri = migrate_get_socket_address(to, "socket-address");
+
+    migrate_qmp(from, uri, "{}");
+
+    wait_for_migration_pass(from);
+
+    /* 300ms it should converge */
+    migrate_set_parameter_int(from, "downtime-limit", 300);
+
+    if (!got_stop) {
+        qtest_qmp_eventwait(from, "STOP");
+    }
+    qtest_qmp_eventwait(to, "RESUME");
+
+    wait_for_serial("dest_serial");
+    wait_for_migration_complete(from);
+    test_migrate_end(from, to, true);
+    free(uri);
+}
+
 int main(int argc, char **argv)
 {
     char template[] = "/tmp/migration-test-XXXXXX";
@@ -1266,6 +1321,7 @@ int main(int argc, char **argv)
                    test_validate_uuid_dst_not_set);
 
     qtest_add_func("/migration/auto_converge", test_migrate_auto_converge);
+    qtest_add_func("/migration/multifd/tcp", test_multifd_tcp);
 
     ret = g_test_run();
 
-- 
2.24.1

[PULL 03/29] migration: Make sure that we don't call write() in case of error

[Juan Quintela]

If we are exiting due to an error/finish/.... Just don't try to even
touch the channel with one IO operation.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 migration/ram.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/migration/ram.c b/migration/ram.c
index b9147bcca3..f946282adb 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -900,6 +900,12 @@ struct {
     uint64_t packet_num;
     /* send channels ready */
     QemuSemaphore channels_ready;
+    /*
+     * Have we already run terminate threads.  There is a race when it
+     * happens that we got one error while we are exiting.
+     * We will use atomic operations.  Only valid values are 0 and 1.
+     */
+    int exiting;
 } *multifd_send_state;
 
 /*
@@ -928,6 +934,10 @@ static int multifd_send_pages(RAMState *rs)
     MultiFDPages_t *pages = multifd_send_state->pages;
     uint64_t transferred;
 
+    if (atomic_read(&multifd_send_state->exiting)) {
+        return -1;
+    }
+
     qemu_sem_wait(&multifd_send_state->channels_ready);
     for (i = next_channel;; i = (i + 1) % migrate_multifd_channels()) {
         p = &multifd_send_state->params[i];
@@ -1009,6 +1019,16 @@ static void multifd_send_terminate_threads(Error *err)
         }
     }
 
+    /*
+     * We don't want to exit each threads twice.  Depending on where
+     * we get the error, or if there are two independent errors in two
+     * threads at the same time, we can end calling this function
+     * twice.
+     */
+    if (atomic_xchg(&multifd_send_state->exiting, 1)) {
+        return;
+    }
+
     for (i = 0; i < migrate_multifd_channels(); i++) {
         MultiFDSendParams *p = &multifd_send_state->params[i];
 
@@ -1118,6 +1138,10 @@ static void *multifd_send_thread(void *opaque)
 
     while (true) {
         qemu_sem_wait(&p->sem);
+
+        if (atomic_read(&multifd_send_state->exiting)) {
+            break;
+        }
         qemu_mutex_lock(&p->mutex);
 
         if (p->pending_job) {
@@ -1224,6 +1248,7 @@ int multifd_save_setup(void)
     multifd_send_state->params = g_new0(MultiFDSendParams, thread_count);
     multifd_send_state->pages = multifd_pages_init(page_count);
     qemu_sem_init(&multifd_send_state->channels_ready, 0);
+    atomic_set(&multifd_send_state->exiting, 0);
 
     for (i = 0; i < thread_count; i++) {
         MultiFDSendParams *p = &multifd_send_state->params[i];
-- 
2.24.1

[PULL 04/29] migration-test: introduce functions to handle string parameters

[Juan Quintela]

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 tests/qtest/migration-test.c | 37 ++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
index fb70214f44..b0580dd541 100644
--- a/tests/qtest/migration-test.c
+++ b/tests/qtest/migration-test.c
@@ -356,6 +356,43 @@ static void migrate_set_parameter_int(QTestState *who, const char *parameter,
     migrate_check_parameter_int(who, parameter, value);
 }
 
+static char *migrate_get_parameter_str(QTestState *who,
+                                       const char *parameter)
+{
+    QDict *rsp;
+    char *result;
+
+    rsp = wait_command(who, "{ 'execute': 'query-migrate-parameters' }");
+    result = g_strdup(qdict_get_str(rsp, parameter));
+    qobject_unref(rsp);
+    return result;
+}
+
+static void migrate_check_parameter_str(QTestState *who, const char *parameter,
+                                        const char *value)
+{
+    char *result;
+
+    result = migrate_get_parameter_str(who, parameter);
+    g_assert_cmpstr(result, ==, value);
+    g_free(result);
+}
+
+__attribute__((unused))
+static void migrate_set_parameter_str(QTestState *who, const char *parameter,
+                                      const char *value)
+{
+    QDict *rsp;
+
+    rsp = qtest_qmp(who,
+                    "{ 'execute': 'migrate-set-parameters',"
+                    "'arguments': { %s: %s } }",
+                    parameter, value);
+    g_assert(qdict_haskey(rsp, "return"));
+    qobject_unref(rsp);
+    migrate_check_parameter_str(who, parameter, value);
+}
+
 static void migrate_pause(QTestState *who)
 {
     QDict *rsp;
-- 
2.24.1

[PULL 05/29] migration-test: ppc64: fix FORTH test program

[Juan Quintela]

From: Laurent Vivier <lvivier@redhat.com>

Commit e51e711b1bef has moved the initialization of start_address and
end_address after the definition of the command line argument,
where the nvramrc is initialized, and thus the loop is between 0 and 0
rather than 1 MiB and 100 MiB.

It doesn't affect the result of the test if all the tests are run in
sequence because the two first tests don't run the loop, so the
values are correctly initialized when we actually need them.

But it hangs when we ask to run only one test, for instance:

    QTEST_QEMU_BINARY=ppc64-softmmu/qemu-system-ppc64 \
    tests/migration-test -m=quick -p /ppc64/migration/validate_uuid_error

Fixes: e51e711b1bef ("tests/migration: Add migration-test header file")
Cc: wei@redhat.com
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 tests/qtest/migration-test.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
index b0580dd541..26e2e77289 100644
--- a/tests/qtest/migration-test.c
+++ b/tests/qtest/migration-test.c
@@ -517,14 +517,14 @@ static int test_migrate_start(QTestState **from, QTestState **to,
     } else if (strcmp(arch, "ppc64") == 0) {
         machine_opts = "vsmt=8";
         memory_size = "256M";
+        start_address = PPC_TEST_MEM_START;
+        end_address = PPC_TEST_MEM_END;
         arch_source = g_strdup_printf("-nodefaults "
                                       "-prom-env 'use-nvramrc?=true' -prom-env "
                                       "'nvramrc=hex .\" _\" begin %x %x "
                                       "do i c@ 1 + i c! 1000 +loop .\" B\" 0 "
                                       "until'", end_address, start_address);
         arch_target = g_strdup("");
-        start_address = PPC_TEST_MEM_START;
-        end_address = PPC_TEST_MEM_END;
     } else if (strcmp(arch, "aarch64") == 0) {
         init_bootfile(bootpath, aarch64_kernel, sizeof(aarch64_kernel));
         machine_opts = "virt,gic-version=max";
-- 
2.24.1

[PULL 06/29] runstate: ignore finishmigrate -> prelaunch transition

[Juan Quintela]

From: Laurent Vivier <lvivier@redhat.com>

Commit 1bd71dce4bf2 tries to prevent a finishmigrate -> prelaunch
transition by exiting at the beginning of the main_loop_should_exit()
function if the state is already finishmigrate.

As the finishmigrate state is set in the migration thread it can
happen concurrently to the function. The migration thread and the
function are normally protected by the iothread mutex and thus the
state should no evolve between the start of the function and its end.

Unfortunately during the function life the lock is released by
pause_all_vcpus() just before the point we need to be sure we are
not in finishmigrate state and if the migration thread is waiting
for the lock it will take the opportunity to change the state
to finishmigrate.

The only way to be sure we are not in the finishmigrate state when
we need is to check the state after the pause_all_vcpus() function.

Fixes: 1bd71dce4bf2 ("runstate: ignore exit request in finish migrate state")
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 vl.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/vl.c b/vl.c
index 158a05ed32..ba3e176094 100644
--- a/vl.c
+++ b/vl.c
@@ -1604,9 +1604,6 @@ static bool main_loop_should_exit(void)
     RunState r;
     ShutdownCause request;
 
-    if (runstate_check(RUN_STATE_FINISH_MIGRATE)) {
-        return false;
-    }
     if (preconfig_exit_requested) {
         if (runstate_check(RUN_STATE_PRECONFIG)) {
             runstate_set(RUN_STATE_PRELAUNCH);
@@ -1635,8 +1632,13 @@ static bool main_loop_should_exit(void)
         pause_all_vcpus();
         qemu_system_reset(request);
         resume_all_vcpus();
+        /*
+         * runstate can change in pause_all_vcpus()
+         * as iothread mutex is unlocked
+         */
         if (!runstate_check(RUN_STATE_RUNNING) &&
-                !runstate_check(RUN_STATE_INMIGRATE)) {
+                !runstate_check(RUN_STATE_INMIGRATE) &&
+                !runstate_check(RUN_STATE_FINISH_MIGRATE)) {
             runstate_set(RUN_STATE_PRELAUNCH);
         }
     }
-- 
2.24.1

[PULL 07/29] ram.c: remove unneeded labels

[Juan Quintela]

From: Daniel Henrique Barboza <danielhb413@gmail.com>

ram_save_queue_pages() has an 'err' label that can be replaced by
'return -1' instead.

Same thing with ram_discard_range(), and in this case we can also
get rid of the 'ret' variable and return either '-1' on error
or the result of ram_block_discard_range().

CC: Juan Quintela <quintela@redhat.com>
CC: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/ram.c | 18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index f946282adb..17cd8d524b 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2459,7 +2459,7 @@ int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len)
              * it's the 1st request.
              */
             error_report("ram_save_queue_pages no previous block");
-            goto err;
+            return -1;
         }
     } else {
         ramblock = qemu_ram_block_by_name(rbname);
@@ -2467,7 +2467,7 @@ int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len)
         if (!ramblock) {
             /* We shouldn't be asked for a non-existent RAMBlock */
             error_report("ram_save_queue_pages no block '%s'", rbname);
-            goto err;
+            return -1;
         }
         rs->last_req_rb = ramblock;
     }
@@ -2476,7 +2476,7 @@ int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len)
         error_report("%s request overrun start=" RAM_ADDR_FMT " len="
                      RAM_ADDR_FMT " blocklen=" RAM_ADDR_FMT,
                      __func__, start, len, ramblock->used_length);
-        goto err;
+        return -1;
     }
 
     struct RAMSrcPageRequest *new_entry =
@@ -2492,9 +2492,6 @@ int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len)
     qemu_mutex_unlock(&rs->src_page_req_mutex);
 
     return 0;
-
-err:
-    return -1;
 }
 
 static bool save_page_use_compression(RAMState *rs)
@@ -3097,8 +3094,6 @@ int ram_postcopy_send_discard_bitmap(MigrationState *ms)
  */
 int ram_discard_range(const char *rbname, uint64_t start, size_t length)
 {
-    int ret = -1;
-
     trace_ram_discard_range(rbname, start, length);
 
     RCU_READ_LOCK_GUARD();
@@ -3106,7 +3101,7 @@ int ram_discard_range(const char *rbname, uint64_t start, size_t length)
 
     if (!rb) {
         error_report("ram_discard_range: Failed to find block '%s'", rbname);
-        goto err;
+        return -1;
     }
 
     /*
@@ -3118,10 +3113,7 @@ int ram_discard_range(const char *rbname, uint64_t start, size_t length)
                      length >> qemu_target_page_bits());
     }
 
-    ret = ram_block_discard_range(rb, start, length);
-
-err:
-    return ret;
+    return ram_block_discard_range(rb, start, length);
 }
 
 /*
-- 
2.24.1

[PULL 08/29] migration: Rate limit inside host pages

[Juan Quintela]

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

When using hugepages, rate limiting is necessary within each huge
page, since a 1G huge page can take a significant time to send, so
you end up with bursty behaviour.

Fixes: 4c011c37ecb3 ("postcopy: Send whole huge pages")
Reported-by: Lin Ma <LMa@suse.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/migration.c  | 57 ++++++++++++++++++++++++------------------
 migration/migration.h  |  1 +
 migration/ram.c        |  2 ++
 migration/trace-events |  4 +--
 4 files changed, 37 insertions(+), 27 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index 354ad072fa..27500d09a9 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -3224,6 +3224,37 @@ void migration_consume_urgent_request(void)
     qemu_sem_wait(&migrate_get_current()->rate_limit_sem);
 }
 
+/* Returns true if the rate limiting was broken by an urgent request */
+bool migration_rate_limit(void)
+{
+    int64_t now = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+    MigrationState *s = migrate_get_current();
+
+    bool urgent = false;
+    migration_update_counters(s, now);
+    if (qemu_file_rate_limit(s->to_dst_file)) {
+        /*
+         * Wait for a delay to do rate limiting OR
+         * something urgent to post the semaphore.
+         */
+        int ms = s->iteration_start_time + BUFFER_DELAY - now;
+        trace_migration_rate_limit_pre(ms);
+        if (qemu_sem_timedwait(&s->rate_limit_sem, ms) == 0) {
+            /*
+             * We were woken by one or more urgent things but
+             * the timedwait will have consumed one of them.
+             * The service routine for the urgent wake will dec
+             * the semaphore itself for each item it consumes,
+             * so add this one we just eat back.
+             */
+            qemu_sem_post(&s->rate_limit_sem);
+            urgent = true;
+        }
+        trace_migration_rate_limit_post(urgent);
+    }
+    return urgent;
+}
+
 /*
  * Master migration thread on the source VM.
  * It drives the migration and pumps the data down the outgoing channel.
@@ -3290,8 +3321,6 @@ static void *migration_thread(void *opaque)
     trace_migration_thread_setup_complete();
 
     while (migration_is_active(s)) {
-        int64_t current_time;
-
         if (urgent || !qemu_file_rate_limit(s->to_dst_file)) {
             MigIterateState iter_state = migration_iteration_run(s);
             if (iter_state == MIG_ITERATE_SKIP) {
@@ -3318,29 +3347,7 @@ static void *migration_thread(void *opaque)
             update_iteration_initial_status(s);
         }
 
-        current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
-
-        migration_update_counters(s, current_time);
-
-        urgent = false;
-        if (qemu_file_rate_limit(s->to_dst_file)) {
-            /* Wait for a delay to do rate limiting OR
-             * something urgent to post the semaphore.
-             */
-            int ms = s->iteration_start_time + BUFFER_DELAY - current_time;
-            trace_migration_thread_ratelimit_pre(ms);
-            if (qemu_sem_timedwait(&s->rate_limit_sem, ms) == 0) {
-                /* We were worken by one or more urgent things but
-                 * the timedwait will have consumed one of them.
-                 * The service routine for the urgent wake will dec
-                 * the semaphore itself for each item it consumes,
-                 * so add this one we just eat back.
-                 */
-                qemu_sem_post(&s->rate_limit_sem);
-                urgent = true;
-            }
-            trace_migration_thread_ratelimit_post(urgent);
-        }
+        urgent = migration_rate_limit();
     }
 
     trace_migration_thread_after_loop();
diff --git a/migration/migration.h b/migration/migration.h
index 79b3dda146..aa9ff6f27b 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -341,5 +341,6 @@ int foreach_not_ignored_block(RAMBlockIterFunc func, void *opaque);
 
 void migration_make_urgent_request(void);
 void migration_consume_urgent_request(void);
+bool migration_rate_limit(void);
 
 #endif
diff --git a/migration/ram.c b/migration/ram.c
index 17cd8d524b..1ec5c10561 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2639,6 +2639,8 @@ static int ram_save_host_page(RAMState *rs, PageSearchStatus *pss,
 
         pages += tmppages;
         pss->page++;
+        /* Allow rate limiting to happen in the middle of huge pages */
+        migration_rate_limit();
     } while ((pss->page & (pagesize_bits - 1)) &&
              offset_in_ramblock(pss->block, pss->page << TARGET_PAGE_BITS));
 
diff --git a/migration/trace-events b/migration/trace-events
index 6dee7b5389..2f9129e213 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -138,12 +138,12 @@ migrate_send_rp_recv_bitmap(char *name, int64_t size) "block '%s' size 0x%"PRIi6
 migration_completion_file_err(void) ""
 migration_completion_postcopy_end(void) ""
 migration_completion_postcopy_end_after_complete(void) ""
+migration_rate_limit_pre(int ms) "%d ms"
+migration_rate_limit_post(int urgent) "urgent: %d"
 migration_return_path_end_before(void) ""
 migration_return_path_end_after(int rp_error) "%d"
 migration_thread_after_loop(void) ""
 migration_thread_file_err(void) ""
-migration_thread_ratelimit_pre(int ms) "%d ms"
-migration_thread_ratelimit_post(int urgent) "urgent: %d"
 migration_thread_setup_complete(void) ""
 open_return_path_on_source(void) ""
 open_return_path_on_source_continue(void) ""
-- 
2.24.1

[PULL 09/29] migration: Fix incorrect integer->float conversion caught by clang

[Juan Quintela]

From: Fangrui Song <i@maskray.me>

Clang does not like qmp_migrate_set_downtime()'s code to clamp double
@value to 0..INT64_MAX:

    qemu/migration/migration.c:2038:24: error: implicit conversion from 'long' to 'double' changes value from 9223372036854775807 to 9223372036854775808 [-Werror,-Wimplicit-int-float-conversion]

The warning will be enabled by default in clang 10. It is not
available for clang <= 9.

The clamp is actually useless; @value is checked to be within
0..MAX_MIGRATE_DOWNTIME_SECONDS immediately before.  Delete it.

While there, make the conversion from double to int64_t explicit.

Signed-off-by: Fangrui Song <i@maskray.me>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
[Patch split, commit message improved]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/migration.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index 27500d09a9..f79d0bf89a 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -2035,11 +2035,10 @@ void qmp_migrate_set_downtime(double value, Error **errp)
     }
 
     value *= 1000; /* Convert to milliseconds */
-    value = MAX(0, MIN(INT64_MAX, value));
 
     MigrateSetParameters p = {
         .has_downtime_limit = true,
-        .downtime_limit = value,
+        .downtime_limit = (int64_t)value,
     };
 
     qmp_migrate_set_parameters(&p, errp);
-- 
2.24.1

[PULL 10/29] migration: Fix the re-run check of the migrate-incoming command

[Juan Quintela]

From: Yury Kotov <yury-kotov@yandex-team.ru>

The current check sets an error but doesn't fail the command.
This may cause a problem if new connection attempt by the same URI
affects the first connection.

Signed-off-by: Yury Kotov <yury-kotov@yandex-team.ru>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/migration.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/migration/migration.c b/migration/migration.c
index f79d0bf89a..e55edee606 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1784,6 +1784,7 @@ void qmp_migrate_incoming(const char *uri, Error **errp)
     }
     if (!once) {
         error_setg(errp, "The incoming migration has already been started");
+        return;
     }
 
     qemu_start_incoming_migration(uri, &local_err);
-- 
2.24.1

[PULL 11/29] misc: use QEMU_IS_ALIGNED

[Juan Quintela]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 exec.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/exec.c b/exec.c
index d4b769d0d4..1feda49ca1 100644
--- a/exec.c
+++ b/exec.c
@@ -3895,7 +3895,7 @@ int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length)
 
     uint8_t *host_startaddr = rb->host + start;
 
-    if ((uintptr_t)host_startaddr & (rb->page_size - 1)) {
+    if (!QEMU_PTR_IS_ALIGNED(host_startaddr, rb->page_size)) {
         error_report("ram_block_discard_range: Unaligned start address: %p",
                      host_startaddr);
         goto err;
@@ -3903,7 +3903,7 @@ int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length)
 
     if ((start + length) <= rb->used_length) {
         bool need_madvise, need_fallocate;
-        if (length & (rb->page_size - 1)) {
+        if (!QEMU_IS_ALIGNED(length, rb->page_size)) {
             error_report("ram_block_discard_range: Unaligned length: %zx",
                          length);
             goto err;
-- 
2.24.1

[PULL 12/29] migration: add savevm_state_handler_remove()

[Juan Quintela]

From: Scott Cheloha <cheloha@linux.vnet.ibm.com>

Create a function to abstract common logic needed when removing a
SaveStateEntry element from the savevm_state.handlers queue.

For now we just remove the element.  Soon it will involve additional
cleanup.

Signed-off-by: Scott Cheloha <cheloha@linux.vnet.ibm.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/savevm.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/migration/savevm.c b/migration/savevm.c
index 59efc1981d..30d980caa2 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -725,6 +725,11 @@ static void savevm_state_handler_insert(SaveStateEntry *nse)
     }
 }
 
+static void savevm_state_handler_remove(SaveStateEntry *se)
+{
+    QTAILQ_REMOVE(&savevm_state.handlers, se, entry);
+}
+
 /* TODO: Individual devices generally have very little idea about the rest
    of the system, so instance_id should be removed/replaced.
    Meanwhile pass -1 as instance_id if you do not already have a clearly
@@ -777,7 +782,7 @@ void unregister_savevm(VMStateIf *obj, const char *idstr, void *opaque)
 
     QTAILQ_FOREACH_SAFE(se, &savevm_state.handlers, entry, new_se) {
         if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
-            QTAILQ_REMOVE(&savevm_state.handlers, se, entry);
+            savevm_state_handler_remove(se);
             g_free(se->compat);
             g_free(se);
         }
@@ -841,7 +846,7 @@ void vmstate_unregister(VMStateIf *obj, const VMStateDescription *vmsd,
 
     QTAILQ_FOREACH_SAFE(se, &savevm_state.handlers, entry, new_se) {
         if (se->vmsd == vmsd && se->opaque == opaque) {
-            QTAILQ_REMOVE(&savevm_state.handlers, se, entry);
+            savevm_state_handler_remove(se);
             g_free(se->compat);
             g_free(se);
         }
-- 
2.24.1

[PULL 13/29] migration: savevm_state_handler_insert: constant-time element insertion

[Juan Quintela]

From: Scott Cheloha <cheloha@linux.vnet.ibm.com>

savevm_state's SaveStateEntry TAILQ is a priority queue.  Priority
sorting is maintained by searching from head to tail for a suitable
insertion spot.  Insertion is thus an O(n) operation.

If we instead keep track of the head of each priority's subqueue
within that larger queue we can reduce this operation to O(1) time.

savevm_state_handler_remove() becomes slightly more complex to
accomodate these gains: we need to replace the head of a priority's
subqueue when removing it.

With O(1) insertion, booting VMs with many SaveStateEntry objects is
more plausible.  For example, a ppc64 VM with maxmem=8T has 40000 such
objects to insert.

Signed-off-by: Scott Cheloha <cheloha@linux.vnet.ibm.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/savevm.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/migration/savevm.c b/migration/savevm.c
index 30d980caa2..e57686bca7 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -250,6 +250,7 @@ typedef struct SaveStateEntry {
 
 typedef struct SaveState {
     QTAILQ_HEAD(, SaveStateEntry) handlers;
+    SaveStateEntry *handler_pri_head[MIG_PRI_MAX + 1];
     int global_section_id;
     uint32_t len;
     const char *name;
@@ -261,6 +262,7 @@ typedef struct SaveState {
 
 static SaveState savevm_state = {
     .handlers = QTAILQ_HEAD_INITIALIZER(savevm_state.handlers),
+    .handler_pri_head = { [MIG_PRI_DEFAULT ... MIG_PRI_MAX] = NULL },
     .global_section_id = 0,
 };
 
@@ -709,24 +711,42 @@ static void savevm_state_handler_insert(SaveStateEntry *nse)
 {
     MigrationPriority priority = save_state_priority(nse);
     SaveStateEntry *se;
+    int i;
 
     assert(priority <= MIG_PRI_MAX);
 
-    QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
-        if (save_state_priority(se) < priority) {
+    for (i = priority - 1; i >= 0; i--) {
+        se = savevm_state.handler_pri_head[i];
+        if (se != NULL) {
+            assert(save_state_priority(se) < priority);
             break;
         }
     }
 
-    if (se) {
+    if (i >= 0) {
         QTAILQ_INSERT_BEFORE(se, nse, entry);
     } else {
         QTAILQ_INSERT_TAIL(&savevm_state.handlers, nse, entry);
     }
+
+    if (savevm_state.handler_pri_head[priority] == NULL) {
+        savevm_state.handler_pri_head[priority] = nse;
+    }
 }
 
 static void savevm_state_handler_remove(SaveStateEntry *se)
 {
+    SaveStateEntry *next;
+    MigrationPriority priority = save_state_priority(se);
+
+    if (se == savevm_state.handler_pri_head[priority]) {
+        next = QTAILQ_NEXT(se, entry);
+        if (next != NULL && save_state_priority(next) == priority) {
+            savevm_state.handler_pri_head[priority] = next;
+        } else {
+            savevm_state.handler_pri_head[priority] = NULL;
+        }
+    }
     QTAILQ_REMOVE(&savevm_state.handlers, se, entry);
 }
 
-- 
2.24.1

[PULL 14/29] migration/ram: Yield periodically to the main loop

[Juan Quintela]

From: Yury Kotov <yury-kotov@yandex-team.ru>

Usually, incoming migration coroutine yields to the main loop
while its IO-channel is waiting for data to receive. But there is a case
when RAM migration and data receive have the same speed: VM with huge
zeroed RAM. In this case, IO-channel won't read and thus the main loop
is stuck and for instance, it doesn't respond to QMP commands.

For this case, yield periodically, but not too often, so as not to
affect the speed of migration.

Signed-off-by: Yury Kotov <yury-kotov@yandex-team.ru>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/ram.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/migration/ram.c b/migration/ram.c
index 1ec5c10561..5cd066467c 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -4246,7 +4246,7 @@ static void colo_flush_ram_cache(void)
  */
 static int ram_load_precopy(QEMUFile *f)
 {
-    int flags = 0, ret = 0, invalid_flags = 0, len = 0;
+    int flags = 0, ret = 0, invalid_flags = 0, len = 0, i = 0;
     /* ADVISE is earlier, it shows the source has the postcopy capability on */
     bool postcopy_advised = postcopy_is_advised();
     if (!migrate_use_compression()) {
@@ -4258,6 +4258,17 @@ static int ram_load_precopy(QEMUFile *f)
         void *host = NULL;
         uint8_t ch;
 
+        /*
+         * Yield periodically to let main loop run, but an iteration of
+         * the main loop is expensive, so do it each some iterations
+         */
+        if ((i & 32767) == 0 && qemu_in_coroutine()) {
+            aio_co_schedule(qemu_get_current_aio_context(),
+                            qemu_coroutine_self());
+            qemu_coroutine_yield();
+        }
+        i++;
+
         addr = qemu_get_be64(f);
         flags = addr & ~TARGET_PAGE_MASK;
         addr &= TARGET_PAGE_MASK;
-- 
2.24.1

[PULL 15/29] migration/postcopy: reduce memset when it is zero page and matches_target_page_size

[Juan Quintela]

From: Wei Yang <richardw.yang@linux.intel.com>

In this case, page_buffer content would not be used.

Skip this to save some time.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/ram.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/migration/ram.c b/migration/ram.c
index 5cd066467c..bdb0316892 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -4126,7 +4126,13 @@ static int ram_load_postcopy(QEMUFile *f)
         switch (flags & ~RAM_SAVE_FLAG_CONTINUE) {
         case RAM_SAVE_FLAG_ZERO:
             ch = qemu_get_byte(f);
-            memset(page_buffer, ch, TARGET_PAGE_SIZE);
+            /*
+             * Can skip to set page_buffer when
+             * this is a zero page and (block->page_size == TARGET_PAGE_SIZE).
+             */
+            if (ch || !matches_target_page_size) {
+                memset(page_buffer, ch, TARGET_PAGE_SIZE);
+            }
             if (ch) {
                 all_zero = false;
             }
-- 
2.24.1

[PULL 16/29] migration/postcopy: wait for decompress thread in precopy

[Juan Quintela]

From: Wei Yang <richardw.yang@linux.intel.com>

Compress is not supported with postcopy, it is safe to wait for
decompress thread just in precopy.

This is a preparation for later patch.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/ram.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index bdb0316892..c13b44b4d9 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -4421,6 +4421,7 @@ static int ram_load_precopy(QEMUFile *f)
         }
     }
 
+    ret |= wait_for_decompress_done();
     return ret;
 }
 
@@ -4452,8 +4453,6 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id)
         } else {
             ret = ram_load_precopy(f);
         }
-
-        ret |= wait_for_decompress_done();
     }
     trace_ram_load_complete(ret, seq_iter);
 
-- 
2.24.1

[PULL 17/29] migration/postcopy: count target page number to decide the place_needed

[Juan Quintela]

From: Wei Yang <richardw.yang@linux.intel.com>

In postcopy, it requires to place whole host page instead of target
page.

Currently, it relies on the page offset to decide whether this is the
last target page. We also can count the target page number during the
iteration. When the number of target page equals
(host page size / target page size), this means it is the last target
page in the host page.

This is a preparation for non-ordered target page transmission.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/ram.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index c13b44b4d9..8ebaea255e 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -4052,6 +4052,7 @@ static int ram_load_postcopy(QEMUFile *f)
     void *postcopy_host_page = mis->postcopy_tmp_page;
     void *last_host = NULL;
     bool all_zero = false;
+    int target_pages = 0;
 
     while (!ret && !(flags & RAM_SAVE_FLAG_EOS)) {
         ram_addr_t addr;
@@ -4086,6 +4087,7 @@ static int ram_load_postcopy(QEMUFile *f)
                 ret = -EINVAL;
                 break;
             }
+            target_pages++;
             matches_target_page_size = block->page_size == TARGET_PAGE_SIZE;
             /*
              * Postcopy requires that we place whole host pages atomically;
@@ -4117,8 +4119,10 @@ static int ram_load_postcopy(QEMUFile *f)
              * If it's the last part of a host page then we place the host
              * page
              */
-            place_needed = (((uintptr_t)host + TARGET_PAGE_SIZE) &
-                                     (block->page_size - 1)) == 0;
+            if (target_pages == (block->page_size / TARGET_PAGE_SIZE)) {
+                place_needed = true;
+                target_pages = 0;
+            }
             place_source = postcopy_host_page;
         }
         last_host = host;
-- 
2.24.1

[PULL 18/29] migration/postcopy: set all_zero to true on the first target page

[Juan Quintela]

From: Wei Yang <richardw.yang@linux.intel.com>

For the first target page, all_zero is set to true for this round check.

After target_pages introduced, we could leverage this variable instead
of checking the address offset.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/ram.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/migration/ram.c b/migration/ram.c
index 8ebaea255e..460abfa2c3 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -4102,7 +4102,7 @@ static int ram_load_postcopy(QEMUFile *f)
             page_buffer = postcopy_host_page +
                           ((uintptr_t)host & (block->page_size - 1));
             /* If all TP are zero then we can optimise the place */
-            if (!((uintptr_t)host & (block->page_size - 1))) {
+            if (target_pages == 1) {
                 all_zero = true;
             } else {
                 /* not the 1st TP within the HP */
-- 
2.24.1

[PULL 19/29] migration/postcopy: enable random order target page arrival

[Juan Quintela]

From: Wei Yang <richardw.yang@linux.intel.com>

After using number of target page received to track one host page, we
could have the capability to handle random order target page arrival in
one host page.

This is a preparation for enabling compress during postcopy.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/ram.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index 460abfa2c3..a7414170e5 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -4050,7 +4050,7 @@ static int ram_load_postcopy(QEMUFile *f)
     MigrationIncomingState *mis = migration_incoming_get_current();
     /* Temporary page that is later 'placed' */
     void *postcopy_host_page = mis->postcopy_tmp_page;
-    void *last_host = NULL;
+    void *this_host = NULL;
     bool all_zero = false;
     int target_pages = 0;
 
@@ -4097,24 +4097,26 @@ static int ram_load_postcopy(QEMUFile *f)
              * that's moved into place later.
              * The migration protocol uses,  possibly smaller, target-pages
              * however the source ensures it always sends all the components
-             * of a host page in order.
+             * of a host page in one chunk.
              */
             page_buffer = postcopy_host_page +
                           ((uintptr_t)host & (block->page_size - 1));
             /* If all TP are zero then we can optimise the place */
             if (target_pages == 1) {
                 all_zero = true;
+                this_host = (void *)QEMU_ALIGN_DOWN((uintptr_t)host,
+                                                    block->page_size);
             } else {
                 /* not the 1st TP within the HP */
-                if (host != (last_host + TARGET_PAGE_SIZE)) {
-                    error_report("Non-sequential target page %p/%p",
-                                  host, last_host);
+                if (QEMU_ALIGN_DOWN((uintptr_t)host, block->page_size) !=
+                    (uintptr_t)this_host) {
+                    error_report("Non-same host page %p/%p",
+                                  host, this_host);
                     ret = -EINVAL;
                     break;
                 }
             }
 
-
             /*
              * If it's the last part of a host page then we place the host
              * page
@@ -4125,7 +4127,6 @@ static int ram_load_postcopy(QEMUFile *f)
             }
             place_source = postcopy_host_page;
         }
-        last_host = host;
 
         switch (flags & ~RAM_SAVE_FLAG_CONTINUE) {
         case RAM_SAVE_FLAG_ZERO:
@@ -4178,7 +4179,8 @@ static int ram_load_postcopy(QEMUFile *f)
 
         if (!ret && place_needed) {
             /* This gets called at the last target page in the host page */
-            void *place_dest = host + TARGET_PAGE_SIZE - block->page_size;
+            void *place_dest = (void *)QEMU_ALIGN_DOWN((uintptr_t)host,
+                                                       block->page_size);
 
             if (all_zero) {
                 ret = postcopy_place_page_zero(mis, place_dest,
-- 
2.24.1

[PULL 20/29] migration/postcopy: enable compress during postcopy

[Juan Quintela]

From: Wei Yang <richardw.yang@linux.intel.com>

postcopy requires to place a whole host page, while migration thread
migrate memory in target page size. This makes postcopy need to collect
all target pages in one host page before placing via userfaultfd.

To enable compress during postcopy, there are two problems to solve:

    1. Random order for target page arrival
    2. Target pages in one host page arrives without interrupt by target
       page from other host page

The first one is handled by previous cleanup patch.

This patch handles the second one by:

    1. Flush compress thread for each host page
    2. Wait for decompress thread for before placing host page

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/migration.c | 11 -----------
 migration/ram.c       | 28 +++++++++++++++++++++++++++-
 2 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index e55edee606..990bff00c0 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1005,17 +1005,6 @@ static bool migrate_caps_check(bool *cap_list,
 #endif
 
     if (cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
-        if (cap_list[MIGRATION_CAPABILITY_COMPRESS]) {
-            /* The decompression threads asynchronously write into RAM
-             * rather than use the atomic copies needed to avoid
-             * userfaulting.  It should be possible to fix the decompression
-             * threads for compatibility in future.
-             */
-            error_setg(errp, "Postcopy is not currently compatible "
-                       "with compression");
-            return false;
-        }
-
         /* This check is reasonably expensive, so only when it's being
          * set the first time, also it's only the destination that needs
          * special support.
diff --git a/migration/ram.c b/migration/ram.c
index a7414170e5..5f20c3d15d 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -3469,6 +3469,14 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
 
             rs->target_page_count += pages;
 
+            /*
+             * During postcopy, it is necessary to make sure one whole host
+             * page is sent in one chunk.
+             */
+            if (migrate_postcopy_ram()) {
+                flush_compressed_data(rs);
+            }
+
             /*
              * we want to check in the 1st loop, just in case it was the 1st
              * time and we had to sync the dirty bitmap.
@@ -4061,6 +4069,7 @@ static int ram_load_postcopy(QEMUFile *f)
         void *place_source = NULL;
         RAMBlock *block = NULL;
         uint8_t ch;
+        int len;
 
         addr = qemu_get_be64(f);
 
@@ -4078,7 +4087,8 @@ static int ram_load_postcopy(QEMUFile *f)
 
         trace_ram_load_postcopy_loop((uint64_t)addr, flags);
         place_needed = false;
-        if (flags & (RAM_SAVE_FLAG_ZERO | RAM_SAVE_FLAG_PAGE)) {
+        if (flags & (RAM_SAVE_FLAG_ZERO | RAM_SAVE_FLAG_PAGE |
+                     RAM_SAVE_FLAG_COMPRESS_PAGE)) {
             block = ram_block_from_stream(f, flags);
 
             host = host_from_ram_block_offset(block, addr);
@@ -4161,6 +4171,17 @@ static int ram_load_postcopy(QEMUFile *f)
                                          TARGET_PAGE_SIZE);
             }
             break;
+        case RAM_SAVE_FLAG_COMPRESS_PAGE:
+            all_zero = false;
+            len = qemu_get_be32(f);
+            if (len < 0 || len > compressBound(TARGET_PAGE_SIZE)) {
+                error_report("Invalid compressed data length: %d", len);
+                ret = -EINVAL;
+                break;
+            }
+            decompress_data_with_multi_threads(f, page_buffer, len);
+            break;
+
         case RAM_SAVE_FLAG_EOS:
             /* normal exit */
             multifd_recv_sync_main();
@@ -4172,6 +4193,11 @@ static int ram_load_postcopy(QEMUFile *f)
             break;
         }
 
+        /* Got the whole host page, wait for decompress before placing. */
+        if (place_needed) {
+            ret |= wait_for_decompress_done();
+        }
+
         /* Detect for any possible file errors */
         if (!ret && qemu_file_get_error(f)) {
             ret = qemu_file_get_error(f);
-- 
2.24.1

[PULL 21/29] migration/multifd: clean pages after filling packet

[Juan Quintela]

From: Wei Yang <richardw.yang@linux.intel.com>

This is a preparation for the next patch:

    not use multifd during postcopy.

Without enabling postcopy, everything looks good. While after enabling
postcopy, migration may fail even not use multifd during postcopy. The
reason is the pages is not properly cleared and *old* target page will
continue to be transferred.

After clean pages, migration succeeds.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/ram.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index 5f20c3d15d..a05448c0c9 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -955,10 +955,10 @@ static int multifd_send_pages(RAMState *rs)
         }
         qemu_mutex_unlock(&p->mutex);
     }
-    p->pages->used = 0;
+    assert(!p->pages->used);
+    assert(!p->pages->block);
 
     p->packet_num = multifd_send_state->packet_num++;
-    p->pages->block = NULL;
     multifd_send_state->pages = p->pages;
     p->pages = pages;
     transferred = ((uint64_t) pages->used) * TARGET_PAGE_SIZE + p->packet_len;
@@ -1154,6 +1154,8 @@ static void *multifd_send_thread(void *opaque)
             p->flags = 0;
             p->num_packets++;
             p->num_pages += used;
+            p->pages->used = 0;
+            p->pages->block = NULL;
             qemu_mutex_unlock(&p->mutex);
 
             trace_multifd_send(p->id, packet_num, used, flags,
-- 
2.24.1

[PULL 22/29] migration/multifd: not use multifd during postcopy

[Juan Quintela]

From: Wei Yang <richardw.yang@linux.intel.com>

We don't support multifd during postcopy, but user still could enable
both multifd and postcopy. This leads to migration failure.

Skip multifd during postcopy.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/ram.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index a05448c0c9..d4f33a4f2f 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2587,10 +2587,13 @@ static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss,
     }
 
     /*
-     * do not use multifd for compression as the first page in the new
-     * block should be posted out before sending the compressed page
+     * Do not use multifd for:
+     * 1. Compression as the first page in the new block should be posted out
+     *    before sending the compressed page
+     * 2. In postcopy as one whole host page should be placed
      */
-    if (!save_page_use_compression(rs) && migrate_use_multifd()) {
+    if (!save_page_use_compression(rs) && migrate_use_multifd()
+        && !migration_in_postcopy()) {
         return ram_save_multifd_page(rs, block, offset);
     }
 
-- 
2.24.1

[PULL 23/29] migration/multifd: fix nullptr access in terminating multifd threads

[Juan Quintela]

From: Jiahui Cen <cenjiahui@huawei.com>

One multifd channel will shutdown all the other multifd's IOChannel when it
fails to receive an IOChannel. In this senario, if some multifds had not
received its IOChannel yet, it would try to shutdown its IOChannel which could
cause nullptr access at qio_channel_shutdown.

Here is the coredump stack:
    #0  object_get_class (obj=obj@entry=0x0) at qom/object.c:908
    #1  0x00005563fdbb8f4a in qio_channel_shutdown (ioc=0x0, how=QIO_CHANNEL_SHUTDOWN_BOTH, errp=0x0) at io/channel.c:355
    #2  0x00005563fd7b4c5f in multifd_recv_terminate_threads (err=<optimized out>) at migration/ram.c:1280
    #3  0x00005563fd7bc019 in multifd_recv_new_channel (ioc=ioc@entry=0x556400255610, errp=errp@entry=0x7ffec07dce00) at migration/ram.c:1478
    #4  0x00005563fda82177 in migration_ioc_process_incoming (ioc=ioc@entry=0x556400255610, errp=errp@entry=0x7ffec07dce30) at migration/migration.c:605
    #5  0x00005563fda8567d in migration_channel_process_incoming (ioc=0x556400255610) at migration/channel.c:44
    #6  0x00005563fda83ee0 in socket_accept_incoming_migration (listener=0x5563fff6b920, cioc=0x556400255610, opaque=<optimized out>) at migration/socket.c:166
    #7  0x00005563fdbc25cd in qio_net_listener_channel_func (ioc=<optimized out>, condition=<optimized out>, opaque=<optimized out>) at io/net-listener.c:54
    #8  0x00007f895b6fe9a9 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
    #9  0x00005563fdc18136 in glib_pollfds_poll () at util/main-loop.c:218
    #10 0x00005563fdc181b5 in os_host_main_loop_wait (timeout=1000000000) at util/main-loop.c:241
    #11 0x00005563fdc183a2 in main_loop_wait (nonblocking=nonblocking@entry=0) at util/main-loop.c:517
    #12 0x00005563fd8edb37 in main_loop () at vl.c:1791
    #13 0x00005563fd74fd45 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4473

To fix it up, let's check p->c before calling qio_channel_shutdown.

Signed-off-by: Jiahui Cen <cenjiahui@huawei.com>
Signed-off-by: Ying Fang <fangying1@huawei.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/ram.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/migration/ram.c b/migration/ram.c
index d4f33a4f2f..278b2ff87a 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1308,7 +1308,9 @@ static void multifd_recv_terminate_threads(Error *err)
            - normal quit, i.e. everything went fine, just finished
            - error quit: We close the channels so the channel threads
              finish the qio_channel_read_all_eof() */
-        qio_channel_shutdown(p->c, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
+        if (p->c) {
+            qio_channel_shutdown(p->c, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
+        }
         qemu_mutex_unlock(&p->mutex);
     }
 }
-- 
2.24.1

[PULL 24/29] migration/multifd: fix destroyed mutex access in terminating multifd threads

[Juan Quintela]

From: Jiahui Cen <cenjiahui@huawei.com>

One multifd will lock all the other multifds' IOChannel mutex to inform them
to quit by setting p->quit or shutting down p->c. In this senario, if some
multifds had already been terminated and multifd_load_cleanup/multifd_save_cleanup
had destroyed their mutex, it could cause destroyed mutex access when trying
lock their mutex.

Here is the coredump stack:
    #0  0x00007f81a2794437 in raise () from /usr/lib64/libc.so.6
    #1  0x00007f81a2795b28 in abort () from /usr/lib64/libc.so.6
    #2  0x00007f81a278d1b6 in __assert_fail_base () from /usr/lib64/libc.so.6
    #3  0x00007f81a278d262 in __assert_fail () from /usr/lib64/libc.so.6
    #4  0x000055eb1bfadbd3 in qemu_mutex_lock_impl (mutex=0x55eb1e2d1988, file=<optimized out>, line=<optimized out>) at util/qemu-thread-posix.c:64
    #5  0x000055eb1bb4564a in multifd_send_terminate_threads (err=<optimized out>) at migration/ram.c:1015
    #6  0x000055eb1bb4bb7f in multifd_send_thread (opaque=0x55eb1e2d19f8) at migration/ram.c:1171
    #7  0x000055eb1bfad628 in qemu_thread_start (args=0x55eb1e170450) at util/qemu-thread-posix.c:502
    #8  0x00007f81a2b36df5 in start_thread () from /usr/lib64/libpthread.so.0
    #9  0x00007f81a286048d in clone () from /usr/lib64/libc.so.6

To fix it up, let's destroy the mutex after all the other multifd threads had
been terminated.

Signed-off-by: Jiahui Cen <cenjiahui@huawei.com>
Signed-off-by: Ying Fang <fangying1@huawei.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/ram.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/migration/ram.c b/migration/ram.c
index 278b2ff87a..7221f54139 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1053,6 +1053,10 @@ void multifd_save_cleanup(void)
         if (p->running) {
             qemu_thread_join(&p->thread);
         }
+    }
+    for (i = 0; i < migrate_multifd_channels(); i++) {
+        MultiFDSendParams *p = &multifd_send_state->params[i];
+
         socket_send_channel_destroy(p->c);
         p->c = NULL;
         qemu_mutex_destroy(&p->mutex);
@@ -1336,6 +1340,10 @@ int multifd_load_cleanup(Error **errp)
             qemu_sem_post(&p->sem_sync);
             qemu_thread_join(&p->thread);
         }
+    }
+    for (i = 0; i < migrate_multifd_channels(); i++) {
+        MultiFDRecvParams *p = &multifd_recv_state->params[i];
+
         object_unref(OBJECT(p->c));
         p->c = NULL;
         qemu_mutex_destroy(&p->mutex);
-- 
2.24.1

[PULL 25/29] Bug #1829242 correction.

[Juan Quintela]

From: Alexey Romko <nevilad@yahoo.com>

Added type conversions to ram_addr_t before all left shifts of page
indexes to TARGET_PAGE_BITS, to correct overflows when the page
address was 4Gb and more.

Signed-off-by: Alexey Romko <nevilad@yahoo.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/ram.c | 29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index 7221f54139..d0940387d1 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1768,7 +1768,7 @@ static inline bool migration_bitmap_clear_dirty(RAMState *rs,
     if (rb->clear_bmap && clear_bmap_test_and_clear(rb, page)) {
         uint8_t shift = rb->clear_bmap_shift;
         hwaddr size = 1ULL << (TARGET_PAGE_BITS + shift);
-        hwaddr start = (page << TARGET_PAGE_BITS) & (-size);
+        hwaddr start = (((ram_addr_t)page) << TARGET_PAGE_BITS) & (-size);
 
         /*
          * CLEAR_BITMAP_SHIFT_MIN should always guarantee this... this
@@ -2005,7 +2005,7 @@ static void ram_release_pages(const char *rbname, uint64_t offset, int pages)
         return;
     }
 
-    ram_discard_range(rbname, offset, pages << TARGET_PAGE_BITS);
+    ram_discard_range(rbname, offset, ((ram_addr_t)pages) << TARGET_PAGE_BITS);
 }
 
 /*
@@ -2093,7 +2093,7 @@ static int ram_save_page(RAMState *rs, PageSearchStatus *pss, bool last_stage)
     uint8_t *p;
     bool send_async = true;
     RAMBlock *block = pss->block;
-    ram_addr_t offset = pss->page << TARGET_PAGE_BITS;
+    ram_addr_t offset = ((ram_addr_t)pss->page) << TARGET_PAGE_BITS;
     ram_addr_t current_addr = block->offset + offset;
 
     p = block->host + offset;
@@ -2280,7 +2280,8 @@ static bool find_dirty_block(RAMState *rs, PageSearchStatus *pss, bool *again)
         *again = false;
         return false;
     }
-    if ((pss->page << TARGET_PAGE_BITS) >= pss->block->used_length) {
+    if ((((ram_addr_t)pss->page) << TARGET_PAGE_BITS)
+        >= pss->block->used_length) {
         /* Didn't find anything in this RAM Block */
         pss->page = 0;
         pss->block = QLIST_NEXT_RCU(pss->block, next);
@@ -2571,7 +2572,7 @@ static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss,
                                 bool last_stage)
 {
     RAMBlock *block = pss->block;
-    ram_addr_t offset = pss->page << TARGET_PAGE_BITS;
+    ram_addr_t offset = ((ram_addr_t)pss->page) << TARGET_PAGE_BITS;
     int res;
 
     if (control_save_page(rs, block, offset, &res)) {
@@ -2657,7 +2658,8 @@ static int ram_save_host_page(RAMState *rs, PageSearchStatus *pss,
         /* Allow rate limiting to happen in the middle of huge pages */
         migration_rate_limit();
     } while ((pss->page & (pagesize_bits - 1)) &&
-             offset_in_ramblock(pss->block, pss->page << TARGET_PAGE_BITS));
+             offset_in_ramblock(pss->block,
+                                ((ram_addr_t)pss->page) << TARGET_PAGE_BITS));
 
     /* The offset we leave with is the last one we looked at */
     pss->page--;
@@ -2874,8 +2876,10 @@ void ram_postcopy_migrated_memory_release(MigrationState *ms)
 
         while (run_start < range) {
             unsigned long run_end = find_next_bit(bitmap, range, run_start + 1);
-            ram_discard_range(block->idstr, run_start << TARGET_PAGE_BITS,
-                              (run_end - run_start) << TARGET_PAGE_BITS);
+            ram_discard_range(block->idstr,
+                              ((ram_addr_t)run_start) << TARGET_PAGE_BITS,
+                              ((ram_addr_t)(run_end - run_start))
+                                << TARGET_PAGE_BITS);
             run_start = find_next_zero_bit(bitmap, range, run_end + 1);
         }
     }
@@ -4273,13 +4277,16 @@ static void colo_flush_ram_cache(void)
         while (block) {
             offset = migration_bitmap_find_dirty(ram_state, block, offset);
 
-            if (offset << TARGET_PAGE_BITS >= block->used_length) {
+            if (((ram_addr_t)offset) << TARGET_PAGE_BITS
+                >= block->used_length) {
                 offset = 0;
                 block = QLIST_NEXT_RCU(block, next);
             } else {
                 migration_bitmap_clear_dirty(ram_state, block, offset);
-                dst_host = block->host + (offset << TARGET_PAGE_BITS);
-                src_host = block->colo_cache + (offset << TARGET_PAGE_BITS);
+                dst_host = block->host
+                         + (((ram_addr_t)offset) << TARGET_PAGE_BITS);
+                src_host = block->colo_cache
+                         + (((ram_addr_t)offset) << TARGET_PAGE_BITS);
                 memcpy(dst_host, src_host, TARGET_PAGE_SIZE);
             }
         }
-- 
2.24.1

[PULL 26/29] migration: Define VMSTATE_INSTANCE_ID_ANY

[Juan Quintela]

From: Peter Xu <peterx@redhat.com>

Define the new macro VMSTATE_INSTANCE_ID_ANY for callers who wants to
auto-generate the vmstate instance ID.  Previously it was hard coded
as -1 instead of this macro.  It helps to change this default value in
the follow up patches.  No functional change.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 backends/dbus-vmstate.c     | 3 ++-
 hw/arm/stellaris.c          | 2 +-
 hw/core/qdev.c              | 3 ++-
 hw/display/ads7846.c        | 2 +-
 hw/i2c/core.c               | 2 +-
 hw/input/stellaris_input.c  | 3 ++-
 hw/intc/apic_common.c       | 2 +-
 hw/misc/max111x.c           | 3 ++-
 hw/net/eepro100.c           | 3 ++-
 hw/pci/pci.c                | 2 +-
 hw/ppc/spapr.c              | 2 +-
 hw/timer/arm_timer.c        | 2 +-
 hw/tpm/tpm_emulator.c       | 3 ++-
 include/migration/vmstate.h | 2 ++
 migration/savevm.c          | 8 ++++----
 15 files changed, 25 insertions(+), 17 deletions(-)

diff --git a/backends/dbus-vmstate.c b/backends/dbus-vmstate.c
index 56b482a7d6..cc594a722e 100644
--- a/backends/dbus-vmstate.c
+++ b/backends/dbus-vmstate.c
@@ -412,7 +412,8 @@ dbus_vmstate_complete(UserCreatable *uc, Error **errp)
         return;
     }
 
-    if (vmstate_register(VMSTATE_IF(self), -1, &dbus_vmstate, self) < 0) {
+    if (vmstate_register(VMSTATE_IF(self), VMSTATE_INSTANCE_ID_ANY,
+                         &dbus_vmstate, self) < 0) {
         error_setg(errp, "Failed to register vmstate");
     }
 }
diff --git a/hw/arm/stellaris.c b/hw/arm/stellaris.c
index b198066b54..bb025e0bd0 100644
--- a/hw/arm/stellaris.c
+++ b/hw/arm/stellaris.c
@@ -708,7 +708,7 @@ static int stellaris_sys_init(uint32_t base, qemu_irq irq,
     memory_region_init_io(&s->iomem, NULL, &ssys_ops, s, "ssys", 0x00001000);
     memory_region_add_subregion(get_system_memory(), base, &s->iomem);
     ssys_reset(s);
-    vmstate_register(NULL, -1, &vmstate_stellaris_sys, s);
+    vmstate_register(NULL, VMSTATE_INSTANCE_ID_ANY, &vmstate_stellaris_sys, s);
     return 0;
 }
 
diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index 9f1753f5cf..58e87d336d 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -879,7 +879,8 @@ static void device_set_realized(Object *obj, bool value, Error **errp)
 
         if (qdev_get_vmsd(dev)) {
             if (vmstate_register_with_alias_id(VMSTATE_IF(dev),
-                                               -1, qdev_get_vmsd(dev), dev,
+                                               VMSTATE_INSTANCE_ID_ANY,
+                                               qdev_get_vmsd(dev), dev,
                                                dev->instance_id_alias,
                                                dev->alias_required_for_version,
                                                &local_err) < 0) {
diff --git a/hw/display/ads7846.c b/hw/display/ads7846.c
index c12272ae72..9228b40b1a 100644
--- a/hw/display/ads7846.c
+++ b/hw/display/ads7846.c
@@ -154,7 +154,7 @@ static void ads7846_realize(SSISlave *d, Error **errp)
 
     ads7846_int_update(s);
 
-    vmstate_register(NULL, -1, &vmstate_ads7846, s);
+    vmstate_register(NULL, VMSTATE_INSTANCE_ID_ANY, &vmstate_ads7846, s);
 }
 
 static void ads7846_class_init(ObjectClass *klass, void *data)
diff --git a/hw/i2c/core.c b/hw/i2c/core.c
index 92cd489069..d770035ba0 100644
--- a/hw/i2c/core.c
+++ b/hw/i2c/core.c
@@ -61,7 +61,7 @@ I2CBus *i2c_init_bus(DeviceState *parent, const char *name)
 
     bus = I2C_BUS(qbus_create(TYPE_I2C_BUS, parent, name));
     QLIST_INIT(&bus->current_devs);
-    vmstate_register(NULL, -1, &vmstate_i2c_bus, bus);
+    vmstate_register(NULL, VMSTATE_INSTANCE_ID_ANY, &vmstate_i2c_bus, bus);
     return bus;
 }
 
diff --git a/hw/input/stellaris_input.c b/hw/input/stellaris_input.c
index 59892b07fc..e6ee5e11f1 100644
--- a/hw/input/stellaris_input.c
+++ b/hw/input/stellaris_input.c
@@ -88,5 +88,6 @@ void stellaris_gamepad_init(int n, qemu_irq *irq, const int *keycode)
     }
     s->num_buttons = n;
     qemu_add_kbd_event_handler(stellaris_gamepad_put_key, s);
-    vmstate_register(NULL, -1, &vmstate_stellaris_gamepad, s);
+    vmstate_register(NULL, VMSTATE_INSTANCE_ID_ANY,
+                     &vmstate_stellaris_gamepad, s);
 }
diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c
index 375cb6abe9..f2c3a7f309 100644
--- a/hw/intc/apic_common.c
+++ b/hw/intc/apic_common.c
@@ -284,7 +284,7 @@ static void apic_common_realize(DeviceState *dev, Error **errp)
     }
 
     if (s->legacy_instance_id) {
-        instance_id = -1;
+        instance_id = VMSTATE_INSTANCE_ID_ANY;
     }
     vmstate_register_with_alias_id(NULL, instance_id, &vmstate_apic_common,
                                    s, -1, 0, NULL);
diff --git a/hw/misc/max111x.c b/hw/misc/max111x.c
index 211008ce02..2b87bdee5b 100644
--- a/hw/misc/max111x.c
+++ b/hw/misc/max111x.c
@@ -146,7 +146,8 @@ static int max111x_init(SSISlave *d, int inputs)
     s->input[7] = 0x80;
     s->com = 0;
 
-    vmstate_register(VMSTATE_IF(dev), -1, &vmstate_max111x, s);
+    vmstate_register(VMSTATE_IF(dev), VMSTATE_INSTANCE_ID_ANY,
+                     &vmstate_max111x, s);
     return 0;
 }
 
diff --git a/hw/net/eepro100.c b/hw/net/eepro100.c
index cc71a7a036..6cc97769d9 100644
--- a/hw/net/eepro100.c
+++ b/hw/net/eepro100.c
@@ -1874,7 +1874,8 @@ static void e100_nic_realize(PCIDevice *pci_dev, Error **errp)
 
     s->vmstate = g_memdup(&vmstate_eepro100, sizeof(vmstate_eepro100));
     s->vmstate->name = qemu_get_queue(s->nic)->model;
-    vmstate_register(VMSTATE_IF(&pci_dev->qdev), -1, s->vmstate, s);
+    vmstate_register(VMSTATE_IF(&pci_dev->qdev), VMSTATE_INSTANCE_ID_ANY,
+                     s->vmstate, s);
 }
 
 static void eepro100_instance_init(Object *obj)
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index e3d310365d..3ac7961451 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -122,7 +122,7 @@ static void pci_bus_realize(BusState *qbus, Error **errp)
     bus->machine_done.notify = pcibus_machine_done;
     qemu_add_machine_init_done_notifier(&bus->machine_done);
 
-    vmstate_register(NULL, -1, &vmstate_pcibus, bus);
+    vmstate_register(NULL, VMSTATE_INSTANCE_ID_ANY, &vmstate_pcibus, bus);
 }
 
 static void pcie_bus_realize(BusState *qbus, Error **errp)
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 30a5fbd3be..02cf53fc5b 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2948,7 +2948,7 @@ static void spapr_machine_init(MachineState *machine)
      * interface, this is a legacy from the sPAPREnvironment structure
      * which predated MachineState but had a similar function */
     vmstate_register(NULL, 0, &vmstate_spapr, spapr);
-    register_savevm_live("spapr/htab", -1, 1,
+    register_savevm_live("spapr/htab", VMSTATE_INSTANCE_ID_ANY, 1,
                          &savevm_htab_handlers, spapr);
 
     qbus_set_hotplug_handler(sysbus_get_default(), OBJECT(machine),
diff --git a/hw/timer/arm_timer.c b/hw/timer/arm_timer.c
index af524fabf7..beaa285685 100644
--- a/hw/timer/arm_timer.c
+++ b/hw/timer/arm_timer.c
@@ -180,7 +180,7 @@ static arm_timer_state *arm_timer_init(uint32_t freq)
     s->control = TIMER_CTRL_IE;
 
     s->timer = ptimer_init(arm_timer_tick, s, PTIMER_POLICY_DEFAULT);
-    vmstate_register(NULL, -1, &vmstate_arm_timer, s);
+    vmstate_register(NULL, VMSTATE_INSTANCE_ID_ANY, &vmstate_arm_timer, s);
     return s;
 }
 
diff --git a/hw/tpm/tpm_emulator.c b/hw/tpm/tpm_emulator.c
index 10d587ed40..3a0fc442f3 100644
--- a/hw/tpm/tpm_emulator.c
+++ b/hw/tpm/tpm_emulator.c
@@ -914,7 +914,8 @@ static void tpm_emulator_inst_init(Object *obj)
     tpm_emu->cur_locty_number = ~0;
     qemu_mutex_init(&tpm_emu->mutex);
 
-    vmstate_register(NULL, -1, &vmstate_tpm_emulator, obj);
+    vmstate_register(NULL, VMSTATE_INSTANCE_ID_ANY,
+                     &vmstate_tpm_emulator, obj);
 }
 
 /*
diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index 4aef72c426..ed74dd5624 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -1157,6 +1157,8 @@ int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd,
 
 bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque);
 
+#define  VMSTATE_INSTANCE_ID_ANY  -1
+
 /* Returns: 0 on success, -1 on failure */
 int vmstate_register_with_alias_id(VMStateIf *obj, int instance_id,
                                    const VMStateDescription *vmsd,
diff --git a/migration/savevm.c b/migration/savevm.c
index e57686bca7..8dab99efc4 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -775,7 +775,7 @@ int register_savevm_live(const char *idstr,
 
     pstrcat(se->idstr, sizeof(se->idstr), idstr);
 
-    if (instance_id == -1) {
+    if (instance_id == VMSTATE_INSTANCE_ID_ANY) {
         se->instance_id = calculate_new_instance_id(se->idstr);
     } else {
         se->instance_id = instance_id;
@@ -842,14 +842,14 @@ int vmstate_register_with_alias_id(VMStateIf *obj, int instance_id,
 
             se->compat = g_new0(CompatEntry, 1);
             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
-            se->compat->instance_id = instance_id == -1 ?
+            se->compat->instance_id = instance_id == VMSTATE_INSTANCE_ID_ANY ?
                          calculate_compat_instance_id(vmsd->name) : instance_id;
-            instance_id = -1;
+            instance_id = VMSTATE_INSTANCE_ID_ANY;
         }
     }
     pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
 
-    if (instance_id == -1) {
+    if (instance_id == VMSTATE_INSTANCE_ID_ANY) {
         se->instance_id = calculate_new_instance_id(se->idstr);
     } else {
         se->instance_id = instance_id;
-- 
2.24.1

[PULL 27/29] migration: Change SaveStateEntry.instance_id into uint32_t

[Juan Quintela]

From: Peter Xu <peterx@redhat.com>

It was always used as 32bit, so define it as used to be clear.
Instead of using -1 as the auto-gen magic value, we switch to
UINT32_MAX.  We also make sure that we don't auto-gen this value to
avoid overflowed instance IDs without being noticed.

Suggested-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 hw/intc/apic_common.c        |  2 +-
 include/migration/register.h |  2 +-
 include/migration/vmstate.h  |  2 +-
 migration/savevm.c           | 18 ++++++++++--------
 stubs/vmstate.c              |  2 +-
 5 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c
index f2c3a7f309..54b8731fca 100644
--- a/hw/intc/apic_common.c
+++ b/hw/intc/apic_common.c
@@ -268,7 +268,7 @@ static void apic_common_realize(DeviceState *dev, Error **errp)
     APICCommonState *s = APIC_COMMON(dev);
     APICCommonClass *info;
     static DeviceState *vapic;
-    int instance_id = s->id;
+    uint32_t instance_id = s->id;
 
     info = APIC_COMMON_GET_CLASS(s);
     info->realize(dev, errp);
diff --git a/include/migration/register.h b/include/migration/register.h
index 00c38ebe9f..c1dcff0f90 100644
--- a/include/migration/register.h
+++ b/include/migration/register.h
@@ -71,7 +71,7 @@ typedef struct SaveVMHandlers {
 } SaveVMHandlers;
 
 int register_savevm_live(const char *idstr,
-                         int instance_id,
+                         uint32_t instance_id,
                          int version_id,
                          const SaveVMHandlers *ops,
                          void *opaque);
diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index ed74dd5624..01790b8d9b 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -1160,7 +1160,7 @@ bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque);
 #define  VMSTATE_INSTANCE_ID_ANY  -1
 
 /* Returns: 0 on success, -1 on failure */
-int vmstate_register_with_alias_id(VMStateIf *obj, int instance_id,
+int vmstate_register_with_alias_id(VMStateIf *obj, uint32_t instance_id,
                                    const VMStateDescription *vmsd,
                                    void *base, int alias_id,
                                    int required_for_version,
diff --git a/migration/savevm.c b/migration/savevm.c
index 8dab99efc4..adfdca26ac 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -233,7 +233,7 @@ typedef struct CompatEntry {
 typedef struct SaveStateEntry {
     QTAILQ_ENTRY(SaveStateEntry) entry;
     char idstr[256];
-    int instance_id;
+    uint32_t instance_id;
     int alias_id;
     int version_id;
     /* version id read from the stream */
@@ -667,10 +667,10 @@ void dump_vmstate_json_to_file(FILE *out_file)
     fclose(out_file);
 }
 
-static int calculate_new_instance_id(const char *idstr)
+static uint32_t calculate_new_instance_id(const char *idstr)
 {
     SaveStateEntry *se;
-    int instance_id = 0;
+    uint32_t instance_id = 0;
 
     QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
         if (strcmp(idstr, se->idstr) == 0
@@ -678,6 +678,8 @@ static int calculate_new_instance_id(const char *idstr)
             instance_id = se->instance_id + 1;
         }
     }
+    /* Make sure we never loop over without being noticed */
+    assert(instance_id != VMSTATE_INSTANCE_ID_ANY);
     return instance_id;
 }
 
@@ -755,7 +757,7 @@ static void savevm_state_handler_remove(SaveStateEntry *se)
    Meanwhile pass -1 as instance_id if you do not already have a clearly
    distinguishing id for all instances of your device class. */
 int register_savevm_live(const char *idstr,
-                         int instance_id,
+                         uint32_t instance_id,
                          int version_id,
                          const SaveVMHandlers *ops,
                          void *opaque)
@@ -809,7 +811,7 @@ void unregister_savevm(VMStateIf *obj, const char *idstr, void *opaque)
     }
 }
 
-int vmstate_register_with_alias_id(VMStateIf *obj, int instance_id,
+int vmstate_register_with_alias_id(VMStateIf *obj, uint32_t instance_id,
                                    const VMStateDescription *vmsd,
                                    void *opaque, int alias_id,
                                    int required_for_version,
@@ -1625,7 +1627,7 @@ int qemu_save_device_state(QEMUFile *f)
     return qemu_file_get_error(f);
 }
 
-static SaveStateEntry *find_se(const char *idstr, int instance_id)
+static SaveStateEntry *find_se(const char *idstr, uint32_t instance_id)
 {
     SaveStateEntry *se;
 
@@ -2292,7 +2294,7 @@ qemu_loadvm_section_start_full(QEMUFile *f, MigrationIncomingState *mis)
     /* Find savevm section */
     se = find_se(idstr, instance_id);
     if (se == NULL) {
-        error_report("Unknown savevm section or instance '%s' %d. "
+        error_report("Unknown savevm section or instance '%s' %"PRIu32". "
                      "Make sure that your current VM setup matches your "
                      "saved VM setup, including any hotplugged devices",
                      idstr, instance_id);
@@ -2316,7 +2318,7 @@ qemu_loadvm_section_start_full(QEMUFile *f, MigrationIncomingState *mis)
 
     ret = vmstate_load(f, se);
     if (ret < 0) {
-        error_report("error while loading state for instance 0x%x of"
+        error_report("error while loading state for instance 0x%"PRIx32" of"
                      " device '%s'", instance_id, idstr);
         return ret;
     }
diff --git a/stubs/vmstate.c b/stubs/vmstate.c
index 6951d9fdc5..cc4fe41dfc 100644
--- a/stubs/vmstate.c
+++ b/stubs/vmstate.c
@@ -4,7 +4,7 @@
 const VMStateDescription vmstate_dummy = {};
 
 int vmstate_register_with_alias_id(VMStateIf *obj,
-                                   int instance_id,
+                                   uint32_t instance_id,
                                    const VMStateDescription *vmsd,
                                    void *base, int alias_id,
                                    int required_for_version,
-- 
2.24.1

[PULL 28/29] apic: Use 32bit APIC ID for migration instance ID

[Juan Quintela]

From: Peter Xu <peterx@redhat.com>

Migration is silently broken now with x2apic config like this:

     -smp 200,maxcpus=288,sockets=2,cores=72,threads=2 \
     -device intel-iommu,intremap=on,eim=on

After migration, the guest kernel could hang at anything, due to
x2apic bit not migrated correctly in IA32_APIC_BASE on some vcpus, so
any operations related to x2apic could be broken then (e.g., RDMSR on
x2apic MSRs could fail because KVM would think that the vcpu hasn't
enabled x2apic at all).

The issue is that the x2apic bit was never applied correctly for vcpus
whose ID > 255 when migrate completes, and that's because when we
migrate APIC we use the APICCommonState.id as instance ID of the
migration stream, while that's too short for x2apic.

Let's use the newly introduced initial_apic_id for that.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 hw/intc/apic_common.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c
index 54b8731fca..b5dbeb6206 100644
--- a/hw/intc/apic_common.c
+++ b/hw/intc/apic_common.c
@@ -268,7 +268,10 @@ static void apic_common_realize(DeviceState *dev, Error **errp)
     APICCommonState *s = APIC_COMMON(dev);
     APICCommonClass *info;
     static DeviceState *vapic;
-    uint32_t instance_id = s->id;
+    uint32_t instance_id = s->initial_apic_id;
+
+    /* Normally initial APIC ID should be no more than hundreds */
+    assert(instance_id != VMSTATE_INSTANCE_ID_ANY);
 
     info = APIC_COMMON_GET_CLASS(s);
     info->realize(dev, errp);
-- 
2.24.1

[PULL 29/29] migration: Support QLIST migration

[Juan Quintela]

From: Eric Auger <eric.auger@redhat.com>

Support QLIST migration using the same principle as QTAILQ:
94869d5c52 ("migration: migrate QTAILQ").

The VMSTATE_QLIST_V macro has the same proto as VMSTATE_QTAILQ_V.
The change mainly resides in QLIST RAW macros: QLIST_RAW_INSERT_HEAD
and QLIST_RAW_REVERSE.

Tests also are provided.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 include/migration/vmstate.h |  21 +++++
 include/qemu/queue.h        |  39 +++++++++
 migration/trace-events      |   5 ++
 migration/vmstate-types.c   |  70 +++++++++++++++
 tests/test-vmstate.c        | 170 ++++++++++++++++++++++++++++++++++++
 5 files changed, 305 insertions(+)

diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index 01790b8d9b..30667631bc 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -229,6 +229,7 @@ extern const VMStateInfo vmstate_info_tmp;
 extern const VMStateInfo vmstate_info_bitmap;
 extern const VMStateInfo vmstate_info_qtailq;
 extern const VMStateInfo vmstate_info_gtree;
+extern const VMStateInfo vmstate_info_qlist;
 
 #define type_check_2darray(t1,t2,n,m) ((t1(*)[n][m])0 - (t2*)0)
 /*
@@ -798,6 +799,26 @@ extern const VMStateInfo vmstate_info_gtree;
     .offset       = offsetof(_state, _field),                                  \
 }
 
+/*
+ * For migrating a QLIST
+ * Target QLIST needs be properly initialized.
+ * _type: type of QLIST element
+ * _next: name of QLIST_ENTRY entry field in QLIST element
+ * _vmsd: VMSD for QLIST element
+ * size: size of QLIST element
+ * start: offset of QLIST_ENTRY in QTAILQ element
+ */
+#define VMSTATE_QLIST_V(_field, _state, _version, _vmsd, _type, _next)  \
+{                                                                        \
+    .name         = (stringify(_field)),                                 \
+    .version_id   = (_version),                                          \
+    .vmsd         = &(_vmsd),                                            \
+    .size         = sizeof(_type),                                       \
+    .info         = &vmstate_info_qlist,                                 \
+    .offset       = offsetof(_state, _field),                            \
+    .start        = offsetof(_type, _next),                              \
+}
+
 /* _f : field name
    _f_n : num of elements field_name
    _n : num of elements
diff --git a/include/qemu/queue.h b/include/qemu/queue.h
index 4764d93ea3..4d4554a7ce 100644
--- a/include/qemu/queue.h
+++ b/include/qemu/queue.h
@@ -501,4 +501,43 @@ union {                                                                 \
         QTAILQ_RAW_TQH_CIRC(head)->tql_prev = QTAILQ_RAW_TQE_CIRC(elm, entry);  \
 } while (/*CONSTCOND*/0)
 
+#define QLIST_RAW_FIRST(head)                                                  \
+        field_at_offset(head, 0, void *)
+
+#define QLIST_RAW_NEXT(elm, entry)                                             \
+        field_at_offset(elm, entry, void *)
+
+#define QLIST_RAW_PREVIOUS(elm, entry)                                         \
+        field_at_offset(elm, entry + sizeof(void *), void *)
+
+#define QLIST_RAW_FOREACH(elm, head, entry)                                    \
+        for ((elm) = *QLIST_RAW_FIRST(head);                                   \
+             (elm);                                                            \
+             (elm) = *QLIST_RAW_NEXT(elm, entry))
+
+#define QLIST_RAW_INSERT_HEAD(head, elm, entry) do {                           \
+        void *first = *QLIST_RAW_FIRST(head);                                  \
+        *QLIST_RAW_FIRST(head) = elm;                                          \
+        *QLIST_RAW_PREVIOUS(elm, entry) = QLIST_RAW_FIRST(head);               \
+        if (first) {                                                           \
+            *QLIST_RAW_NEXT(elm, entry) = first;                               \
+            *QLIST_RAW_PREVIOUS(first, entry) = QLIST_RAW_NEXT(elm, entry);    \
+        } else {                                                               \
+            *QLIST_RAW_NEXT(elm, entry) = NULL;                                \
+        }                                                                      \
+} while (0)
+
+#define QLIST_RAW_REVERSE(head, elm, entry) do {                               \
+        void *iter = *QLIST_RAW_FIRST(head), *prev = NULL, *next;              \
+        while (iter) {                                                         \
+            next = *QLIST_RAW_NEXT(iter, entry);                               \
+            *QLIST_RAW_PREVIOUS(iter, entry) = QLIST_RAW_NEXT(next, entry);    \
+            *QLIST_RAW_NEXT(iter, entry) = prev;                               \
+            prev = iter;                                                       \
+            iter = next;                                                       \
+        }                                                                      \
+        *QLIST_RAW_FIRST(head) = prev;                                         \
+        *QLIST_RAW_PREVIOUS(prev, entry) = QLIST_RAW_FIRST(head);              \
+} while (0)
+
 #endif /* QEMU_SYS_QUEUE_H */
diff --git a/migration/trace-events b/migration/trace-events
index 2f9129e213..4ab0a503d2 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -76,6 +76,11 @@ get_gtree_end(const char *field_name, const char *key_vmsd_name, const char *val
 put_gtree(const char *field_name, const char *key_vmsd_name, const char *val_vmsd_name, uint32_t nnodes) "%s(%s/%s) nnodes=%d"
 put_gtree_end(const char *field_name, const char *key_vmsd_name, const char *val_vmsd_name, int ret) "%s(%s/%s) %d"
 
+get_qlist(const char *field_name, const char *vmsd_name, int version_id) "%s(%s v%d)"
+get_qlist_end(const char *field_name, const char *vmsd_name) "%s(%s)"
+put_qlist(const char *field_name, const char *vmsd_name, int version_id) "%s(%s v%d)"
+put_qlist_end(const char *field_name, const char *vmsd_name) "%s(%s)"
+
 # qemu-file.c
 qemu_file_fclose(void) ""
 
diff --git a/migration/vmstate-types.c b/migration/vmstate-types.c
index 7236cf92bc..1eee36773a 100644
--- a/migration/vmstate-types.c
+++ b/migration/vmstate-types.c
@@ -843,3 +843,73 @@ const VMStateInfo vmstate_info_gtree = {
     .get  = get_gtree,
     .put  = put_gtree,
 };
+
+static int put_qlist(QEMUFile *f, void *pv, size_t unused_size,
+                     const VMStateField *field, QJSON *vmdesc)
+{
+    const VMStateDescription *vmsd = field->vmsd;
+    /* offset of the QTAILQ entry in a QTAILQ element*/
+    size_t entry_offset = field->start;
+    void *elm;
+    int ret;
+
+    trace_put_qlist(field->name, vmsd->name, vmsd->version_id);
+    QLIST_RAW_FOREACH(elm, pv, entry_offset) {
+        qemu_put_byte(f, true);
+        ret = vmstate_save_state(f, vmsd, elm, vmdesc);
+        if (ret) {
+            error_report("%s: failed to save %s (%d)", field->name,
+                         vmsd->name, ret);
+            return ret;
+        }
+    }
+    qemu_put_byte(f, false);
+    trace_put_qlist_end(field->name, vmsd->name);
+
+    return 0;
+}
+
+static int get_qlist(QEMUFile *f, void *pv, size_t unused_size,
+                     const VMStateField *field)
+{
+    int ret = 0;
+    const VMStateDescription *vmsd = field->vmsd;
+    /* size of a QLIST element */
+    size_t size = field->size;
+    /* offset of the QLIST entry in a QLIST element */
+    size_t entry_offset = field->start;
+    int version_id = field->version_id;
+    void *elm;
+
+    trace_get_qlist(field->name, vmsd->name, vmsd->version_id);
+    if (version_id > vmsd->version_id) {
+        error_report("%s %s",  vmsd->name, "too new");
+        return -EINVAL;
+    }
+    if (version_id < vmsd->minimum_version_id) {
+        error_report("%s %s",  vmsd->name, "too old");
+        return -EINVAL;
+    }
+
+    while (qemu_get_byte(f)) {
+        elm = g_malloc(size);
+        ret = vmstate_load_state(f, vmsd, elm, version_id);
+        if (ret) {
+            error_report("%s: failed to load %s (%d)", field->name,
+                         vmsd->name, ret);
+            g_free(elm);
+            return ret;
+        }
+        QLIST_RAW_INSERT_HEAD(pv, elm, entry_offset);
+    }
+    QLIST_RAW_REVERSE(pv, elm, entry_offset);
+    trace_get_qlist_end(field->name, vmsd->name);
+
+    return ret;
+}
+
+const VMStateInfo vmstate_info_qlist = {
+    .name = "qlist",
+    .get  = get_qlist,
+    .put  = put_qlist,
+};
diff --git a/tests/test-vmstate.c b/tests/test-vmstate.c
index 8f184f3556..cea363dd69 100644
--- a/tests/test-vmstate.c
+++ b/tests/test-vmstate.c
@@ -926,6 +926,28 @@ static const VMStateDescription vmstate_domain = {
     }
 };
 
+/* test QLIST Migration */
+
+typedef struct TestQListElement {
+    uint32_t  id;
+    QLIST_ENTRY(TestQListElement) next;
+} TestQListElement;
+
+typedef struct TestQListContainer {
+    uint32_t  id;
+    QLIST_HEAD(, TestQListElement) list;
+} TestQListContainer;
+
+static const VMStateDescription vmstate_qlist_element = {
+    .name = "test/queue list",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(id, TestQListElement),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 static const VMStateDescription vmstate_iommu = {
     .name = "iommu",
     .version_id = 1,
@@ -939,6 +961,18 @@ static const VMStateDescription vmstate_iommu = {
     }
 };
 
+static const VMStateDescription vmstate_container = {
+    .name = "test/container/qlist",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(id, TestQListContainer),
+        VMSTATE_QLIST_V(list, TestQListContainer, 1, vmstate_qlist_element,
+                        TestQListElement, next),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 uint8_t first_domain_dump[] = {
     /* id */
     0x00, 0x0, 0x0, 0x6,
@@ -1229,6 +1263,140 @@ static void test_gtree_load_iommu(void)
     qemu_fclose(fload);
 }
 
+static uint8_t qlist_dump[] = {
+    0x00, 0x00, 0x00, 0x01, /* container id */
+    0x1, /* start of a */
+    0x00, 0x00, 0x00, 0x0a,
+    0x1, /* start of b */
+    0x00, 0x00, 0x0b, 0x00,
+    0x1, /* start of c */
+    0x00, 0x0c, 0x00, 0x00,
+    0x1, /* start of d */
+    0x0d, 0x00, 0x00, 0x00,
+    0x0, /* end of list */
+    QEMU_VM_EOF, /* just to ensure we won't get EOF reported prematurely */
+};
+
+static TestQListContainer *alloc_container(void)
+{
+    TestQListElement *a = g_malloc(sizeof(TestQListElement));
+    TestQListElement *b = g_malloc(sizeof(TestQListElement));
+    TestQListElement *c = g_malloc(sizeof(TestQListElement));
+    TestQListElement *d = g_malloc(sizeof(TestQListElement));
+    TestQListContainer *container = g_malloc(sizeof(TestQListContainer));
+
+    a->id = 0x0a;
+    b->id = 0x0b00;
+    c->id = 0xc0000;
+    d->id = 0xd000000;
+    container->id = 1;
+
+    QLIST_INIT(&container->list);
+    QLIST_INSERT_HEAD(&container->list, d, next);
+    QLIST_INSERT_HEAD(&container->list, c, next);
+    QLIST_INSERT_HEAD(&container->list, b, next);
+    QLIST_INSERT_HEAD(&container->list, a, next);
+    return container;
+}
+
+static void free_container(TestQListContainer *container)
+{
+    TestQListElement *iter, *tmp;
+
+    QLIST_FOREACH_SAFE(iter, &container->list, next, tmp) {
+        QLIST_REMOVE(iter, next);
+        g_free(iter);
+    }
+    g_free(container);
+}
+
+static void compare_containers(TestQListContainer *c1, TestQListContainer *c2)
+{
+    TestQListElement *first_item_c1, *first_item_c2;
+
+    while (!QLIST_EMPTY(&c1->list)) {
+        first_item_c1 = QLIST_FIRST(&c1->list);
+        first_item_c2 = QLIST_FIRST(&c2->list);
+        assert(first_item_c2);
+        assert(first_item_c1->id == first_item_c2->id);
+        QLIST_REMOVE(first_item_c1, next);
+        QLIST_REMOVE(first_item_c2, next);
+        g_free(first_item_c1);
+        g_free(first_item_c2);
+    }
+    assert(QLIST_EMPTY(&c2->list));
+}
+
+/*
+ * Check the prev & next fields are correct by doing list
+ * manipulations on the container. We will do that for both
+ * the source and the destination containers
+ */
+static void manipulate_container(TestQListContainer *c)
+{
+     TestQListElement *prev = NULL, *iter = QLIST_FIRST(&c->list);
+     TestQListElement *elem;
+
+     elem = g_malloc(sizeof(TestQListElement));
+     elem->id = 0x12;
+     QLIST_INSERT_AFTER(iter, elem, next);
+
+     elem = g_malloc(sizeof(TestQListElement));
+     elem->id = 0x13;
+     QLIST_INSERT_HEAD(&c->list, elem, next);
+
+     while (iter) {
+        prev = iter;
+        iter = QLIST_NEXT(iter, next);
+     }
+
+     elem = g_malloc(sizeof(TestQListElement));
+     elem->id = 0x14;
+     QLIST_INSERT_BEFORE(prev, elem, next);
+
+     elem = g_malloc(sizeof(TestQListElement));
+     elem->id = 0x15;
+     QLIST_INSERT_AFTER(prev, elem, next);
+
+     QLIST_REMOVE(prev, next);
+     g_free(prev);
+}
+
+static void test_save_qlist(void)
+{
+    TestQListContainer *container = alloc_container();
+
+    save_vmstate(&vmstate_container, container);
+    compare_vmstate(qlist_dump, sizeof(qlist_dump));
+    free_container(container);
+}
+
+static void test_load_qlist(void)
+{
+    QEMUFile *fsave, *fload;
+    TestQListContainer *orig_container = alloc_container();
+    TestQListContainer *dest_container = g_malloc0(sizeof(TestQListContainer));
+    char eof;
+
+    QLIST_INIT(&dest_container->list);
+
+    fsave = open_test_file(true);
+    qemu_put_buffer(fsave, qlist_dump, sizeof(qlist_dump));
+    g_assert(!qemu_file_get_error(fsave));
+    qemu_fclose(fsave);
+
+    fload = open_test_file(false);
+    vmstate_load_state(fload, &vmstate_container, dest_container, 1);
+    eof = qemu_get_byte(fload);
+    g_assert(!qemu_file_get_error(fload));
+    g_assert_cmpint(eof, ==, QEMU_VM_EOF);
+    manipulate_container(orig_container);
+    manipulate_container(dest_container);
+    compare_containers(orig_container, dest_container);
+    free_container(orig_container);
+    free_container(dest_container);
+}
+
 typedef struct TmpTestStruct {
     TestStruct *parent;
     int64_t diff;
@@ -1353,6 +1521,8 @@ int main(int argc, char **argv)
     g_test_add_func("/vmstate/gtree/load/loaddomain", test_gtree_load_domain);
     g_test_add_func("/vmstate/gtree/save/saveiommu", test_gtree_save_iommu);
     g_test_add_func("/vmstate/gtree/load/loadiommu", test_gtree_load_iommu);
+    g_test_add_func("/vmstate/qlist/save/saveqlist", test_save_qlist);
+    g_test_add_func("/vmstate/qlist/load/loadqlist", test_load_qlist);
     g_test_add_func("/vmstate/tmp_struct", test_tmp_struct);
     g_test_run();
 
-- 
2.24.1

Re: [PULL 00/29] Migration pull patches (second try)

[Peter Maydell]

On Tue, 14 Jan 2020 at 09:26, Juan Quintela <quintela@redhat.com> wrote:
>
> The following changes since commit 3c8a6575985b1652b45bfa670b5e1907d642cfa0:
>
>   Merge remote-tracking branch 'remotes/kraxel/tags/usb-20200113-pull-request' into staging (2020-01-13 14:19:57 +0000)
>
> are available in the Git repository at:
>
>   https://github.com/juanquintela/qemu.git tags/migration-pull-pull-request
>
> for you to fetch changes up to 4eafab585c091050b5ae63130f46fe46ac919c3a:
>
>   migration: Support QLIST migration (2020-01-14 10:17:12 +0100)
>
> ----------------------------------------------------------------
> Migration pull request
> - updated QList patch
> - initialize local msg variable
>
> ----------------------------------------------------------------

Still fails on hosts where ram_addr_t is 32 bits.
Looks like you still haven't got the fix for the problem
Dan pointed out where multifd_save_setup() is using the
wrong type when it calculates p->packetlen to allocate the
data structure.

thanks
-- PMM

Re: [PULL 00/29] Migration pull patches (second try)

[Juan Quintela]

Peter Maydell <peter.maydell@linaro.org> wrote:
> On Tue, 14 Jan 2020 at 09:26, Juan Quintela <quintela@redhat.com> wrote:
>>
>> The following changes since commit 3c8a6575985b1652b45bfa670b5e1907d642cfa0:
>>
>>   Merge remote-tracking branch
>> 'remotes/kraxel/tags/usb-20200113-pull-request' into staging
>> (2020-01-13 14:19:57 +0000)
>>
>> are available in the Git repository at:
>>
>>   https://github.com/juanquintela/qemu.git tags/migration-pull-pull-request
>>
>> for you to fetch changes up to 4eafab585c091050b5ae63130f46fe46ac919c3a:
>>
>>   migration: Support QLIST migration (2020-01-14 10:17:12 +0100)
>>
>> ----------------------------------------------------------------
>> Migration pull request
>> - updated QList patch
>> - initialize local msg variable
>>
>> ----------------------------------------------------------------
>
> Still fails on hosts where ram_addr_t is 32 bits.
> Looks like you still haven't got the fix for the problem
> Dan pointed out where multifd_save_setup() is using the
> wrong type when it calculates p->packetlen to allocate the
> data structure.

Ouch.  Then there is "yet" another different problem. I fixed the one
that daniel pointed.

Working there.

Re: [PULL 00/29] Migration pull patches (second try)

[Peter Maydell]

On Tue, 14 Jan 2020 at 11:22, Juan Quintela <quintela@redhat.com> wrote:
>
> Peter Maydell <peter.maydell@linaro.org> wrote:
> > Still fails on hosts where ram_addr_t is 32 bits.
> > Looks like you still haven't got the fix for the problem
> > Dan pointed out where multifd_save_setup() is using the
> > wrong type when it calculates p->packetlen to allocate the
> > data structure.
>
> Ouch.  Then there is "yet" another different problem. I fixed the one
> that daniel pointed.

Daniel pointed out both bugs back in July, in the same email,
and again this time around...

thanks
-- PMM

Re: [PULL 00/29] Migration pull patches (second try)

[Daniel P. Berrangé]

On Tue, Jan 14, 2020 at 12:22:10PM +0100, Juan Quintela wrote:
> Peter Maydell <peter.maydell@linaro.org> wrote:
> > On Tue, 14 Jan 2020 at 09:26, Juan Quintela <quintela@redhat.com> wrote:
> >>
> >> The following changes since commit 3c8a6575985b1652b45bfa670b5e1907d642cfa0:
> >>
> >>   Merge remote-tracking branch
> >> 'remotes/kraxel/tags/usb-20200113-pull-request' into staging
> >> (2020-01-13 14:19:57 +0000)
> >>
> >> are available in the Git repository at:
> >>
> >>   https://github.com/juanquintela/qemu.git tags/migration-pull-pull-request
> >>
> >> for you to fetch changes up to 4eafab585c091050b5ae63130f46fe46ac919c3a:
> >>
> >>   migration: Support QLIST migration (2020-01-14 10:17:12 +0100)
> >>
> >> ----------------------------------------------------------------
> >> Migration pull request
> >> - updated QList patch
> >> - initialize local msg variable
> >>
> >> ----------------------------------------------------------------
> >
> > Still fails on hosts where ram_addr_t is 32 bits.
> > Looks like you still haven't got the fix for the problem
> > Dan pointed out where multifd_save_setup() is using the
> > wrong type when it calculates p->packetlen to allocate the
> > data structure.
> 
> Ouch.  Then there is "yet" another different problem. I fixed the one
> that daniel pointed.

Err, no you only fixed one of the two bugs I pointed out (for a second
time)

Regards,
Daniel
-- 
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Re: [PULL 00/29] Migration pull patches (second try)

[no-reply]

Patchew URL: https://patchew.org/QEMU/20200114092606.1761-1-quintela@redhat.com/



Hi,

This series seems to have some coding style problems. See output below for
more information:

Subject: [PULL 00/29] Migration pull patches (second try)
Type: series
Message-id: 20200114092606.1761-1-quintela@redhat.com

=== TEST SCRIPT BEGIN ===
#!/bin/bash
git rev-parse base > /dev/null || exit 0
git config --local diff.renamelimit 0
git config --local diff.renames True
git config --local diff.algorithm histogram
./scripts/checkpatch.pl --mailback base..
=== TEST SCRIPT END ===

Switched to a new branch 'test'
0c3394b migration: Support QLIST migration
9f8433e apic: Use 32bit APIC ID for migration instance ID
b29c843 migration: Change SaveStateEntry.instance_id into uint32_t
efd00fa migration: Define VMSTATE_INSTANCE_ID_ANY
c9e615f Bug #1829242 correction.
90e17af migration/multifd: fix destroyed mutex access in terminating multifd threads
40d8962 migration/multifd: fix nullptr access in terminating multifd threads
3291d93 migration/multifd: not use multifd during postcopy
ac5f0e5 migration/multifd: clean pages after filling packet
3f9f3e0 migration/postcopy: enable compress during postcopy
b533fd6 migration/postcopy: enable random order target page arrival
51a912d migration/postcopy: set all_zero to true on the first target page
1d79640 migration/postcopy: count target page number to decide the place_needed
1bb0660 migration/postcopy: wait for decompress thread in precopy
2d9ee73 migration/postcopy: reduce memset when it is zero page and matches_target_page_size
1656129 migration/ram: Yield periodically to the main loop
34e9a27 migration: savevm_state_handler_insert: constant-time element insertion
eecc4fb migration: add savevm_state_handler_remove()
5eaf803 misc: use QEMU_IS_ALIGNED
1262d9d migration: Fix the re-run check of the migrate-incoming command
bda9064 migration: Fix incorrect integer->float conversion caught by clang
af366d8 migration: Rate limit inside host pages
b70f326 ram.c: remove unneeded labels
076fa7c runstate: ignore finishmigrate -> prelaunch transition
139b217 migration-test: ppc64: fix FORTH test program
f821049 migration-test: introduce functions to handle string parameters
70de133 migration: Make sure that we don't call write() in case of error
397caec migration-test: Add migration multifd test
9a898ef multifd: Initialize local variable

=== OUTPUT BEGIN ===
1/29 Checking commit 9a898efa8cdd (multifd: Initialize local variable)
ERROR: Missing Signed-off-by: line(s)

total: 1 errors, 0 warnings, 8 lines checked

Patch 1/29 has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.

2/29 Checking commit 397caec25c6d (migration-test: Add migration multifd test)
3/29 Checking commit 70de13354cf7 (migration: Make sure that we don't call write() in case of error)
4/29 Checking commit f8210496ba76 (migration-test: introduce functions to handle string parameters)
5/29 Checking commit 139b217960ef (migration-test: ppc64: fix FORTH test program)
6/29 Checking commit 076fa7cc767e (runstate: ignore finishmigrate -> prelaunch transition)
7/29 Checking commit b70f326cad3e (ram.c: remove unneeded labels)
8/29 Checking commit af366d8d4aa3 (migration: Rate limit inside host pages)
9/29 Checking commit bda906418d94 (migration: Fix incorrect integer->float conversion caught by clang)
10/29 Checking commit 1262d9df6af7 (migration: Fix the re-run check of the migrate-incoming command)
11/29 Checking commit 5eaf8034e18e (misc: use QEMU_IS_ALIGNED)
12/29 Checking commit eecc4fb12fe4 (migration: add savevm_state_handler_remove())
13/29 Checking commit 34e9a27c5352 (migration: savevm_state_handler_insert: constant-time element insertion)
14/29 Checking commit 165612933a8a (migration/ram: Yield periodically to the main loop)
15/29 Checking commit 2d9ee73dc120 (migration/postcopy: reduce memset when it is zero page and matches_target_page_size)
16/29 Checking commit 1bb06608be50 (migration/postcopy: wait for decompress thread in precopy)
17/29 Checking commit 1d7964001e43 (migration/postcopy: count target page number to decide the place_needed)
18/29 Checking commit 51a912d14296 (migration/postcopy: set all_zero to true on the first target page)
19/29 Checking commit b533fd62c4f2 (migration/postcopy: enable random order target page arrival)
20/29 Checking commit 3f9f3e010fc0 (migration/postcopy: enable compress during postcopy)
21/29 Checking commit ac5f0e5b4216 (migration/multifd: clean pages after filling packet)
22/29 Checking commit 3291d939accf (migration/multifd: not use multifd during postcopy)
23/29 Checking commit 40d8962c5339 (migration/multifd: fix nullptr access in terminating multifd threads)
24/29 Checking commit 90e17aff65e2 (migration/multifd: fix destroyed mutex access in terminating multifd threads)
25/29 Checking commit c9e615f603c9 (Bug #1829242 correction.)
26/29 Checking commit efd00face1e8 (migration: Define VMSTATE_INSTANCE_ID_ANY)
27/29 Checking commit b29c84322acc (migration: Change SaveStateEntry.instance_id into uint32_t)
28/29 Checking commit 9f8433e74628 (apic: Use 32bit APIC ID for migration instance ID)
29/29 Checking commit 0c3394b08365 (migration: Support QLIST migration)
=== OUTPUT END ===

Test command exited with code: 1


The full log is available at
http://patchew.org/logs/20200114092606.1761-1-quintela@redhat.com/testing.checkpatch/?type=message.
---
Email generated automatically by Patchew [https://patchew.org/].
Please send your feedback to patchew-devel@redhat.com

Re: [PULL 00/29] Migration pull patches (second try)

[Peter Maydell]

On Tue, 14 Jan 2020 at 09:26, Juan Quintela <quintela@redhat.com> wrote:
>
> The following changes since commit 3c8a6575985b1652b45bfa670b5e1907d642cfa0:
>
>   Merge remote-tracking branch 'remotes/kraxel/tags/usb-20200113-pull-request' into staging (2020-01-13 14:19:57 +0000)
>
> are available in the Git repository at:
>
>   https://github.com/juanquintela/qemu.git tags/migration-pull-pull-request
>
> for you to fetch changes up to 4eafab585c091050b5ae63130f46fe46ac919c3a:
>
>   migration: Support QLIST migration (2020-01-14 10:17:12 +0100)
>
> ----------------------------------------------------------------
> Migration pull request
> - updated QList patch
> - initialize local msg variable

Also, your patch 1 has no Signed-off-by: line. Ideally you
should post it on the list before putting it in a pullreq...

thanks
-- PMM

[PULL 00/29] Migration pull patches

[Juan Quintela]

The following changes since commit 7fb38daf256bd1bcbcb5ea556422283d0d55a1b1:

  Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20200117-1' into staging (2020-01-17 17:27:20 +0000)

are available in the Git repository at:

  https://github.com/juanquintela/qemu.git tags/migration-pull-pull-request

for you to fetch changes up to ddac5cb2d95774cd019bfaf93c54ffd921095fea:

  multifd: Be consistent about using uint64_t (2020-01-20 09:17:07 +0100)

----------------------------------------------------------------
Migration pull request (take 5)

Making history short:

* having your machine named x32 to really be a 32bit guest helps for
  testing 32bits
* disabling CONFIG_XEN on i686 makes rdma_addr_t be a 32bit value

After this, and patch sent on Friday, I got this pull request to:
* compile on x86_64
* pass tests on x86_64
* compile on i686
* pass tests on i686 (with rdma_dma_t 32 bits)
* cross-compile for windows 32bits
* cross-compile for windows 64bits

Please apply, Juan.

----------------------------------------------------------------

Alexey Romko (1):
  Bug #1829242 correction.

Daniel Henrique Barboza (1):
  ram.c: remove unneeded labels

Dr. David Alan Gilbert (1):
  migration: Rate limit inside host pages

Eric Auger (1):
  migration: Support QLIST migration

Fangrui Song (1):
  migration: Fix incorrect integer->float conversion caught by clang

Jiahui Cen (2):
  migration/multifd: fix nullptr access in terminating multifd threads
  migration/multifd: fix destroyed mutex access in terminating multifd
    threads

Juan Quintela (5):
  multifd: Initialize local variable
  migration-test: Add migration multifd test
  migration: Make sure that we don't call write() in case of error
  migration-test: introduce functions to handle string parameters
  multifd: Be consistent about using uint64_t

Laurent Vivier (1):
  runstate: ignore finishmigrate -> prelaunch transition

Marc-André Lureau (1):
  misc: use QEMU_IS_ALIGNED

Peter Xu (3):
  migration: Define VMSTATE_INSTANCE_ID_ANY
  migration: Change SaveStateEntry.instance_id into uint32_t
  apic: Use 32bit APIC ID for migration instance ID

Scott Cheloha (2):
  migration: add savevm_state_handler_remove()
  migration: savevm_state_handler_insert: constant-time element
    insertion

Wei Yang (8):
  migration/postcopy: reduce memset when it is zero page and
    matches_target_page_size
  migration/postcopy: wait for decompress thread in precopy
  migration/postcopy: count target page number to decide the
    place_needed
  migration/postcopy: set all_zero to true on the first target page
  migration/postcopy: enable random order target page arrival
  migration/postcopy: enable compress during postcopy
  migration/multifd: clean pages after filling packet
  migration/multifd: not use multifd during postcopy

Yury Kotov (2):
  migration: Fix the re-run check of the migrate-incoming command
  migration/ram: Yield periodically to the main loop

 backends/dbus-vmstate.c      |   3 +-
 exec.c                       |   4 +-
 hw/arm/stellaris.c           |   2 +-
 hw/core/qdev.c               |   3 +-
 hw/display/ads7846.c         |   2 +-
 hw/i2c/core.c                |   2 +-
 hw/input/stellaris_input.c   |   3 +-
 hw/intc/apic_common.c        |   7 +-
 hw/misc/max111x.c            |   3 +-
 hw/net/eepro100.c            |   3 +-
 hw/pci/pci.c                 |   2 +-
 hw/ppc/spapr.c               |   2 +-
 hw/timer/arm_timer.c         |   2 +-
 hw/tpm/tpm_emulator.c        |   3 +-
 include/migration/register.h |   2 +-
 include/migration/vmstate.h  |  25 ++++-
 include/qemu/queue.h         |  39 +++++++
 migration/migration.c        |  72 ++++++-------
 migration/migration.h        |   1 +
 migration/ram.c              | 196 +++++++++++++++++++++++++----------
 migration/savevm.c           |  61 ++++++++---
 migration/trace-events       |   9 +-
 migration/vmstate-types.c    |  70 +++++++++++++
 stubs/vmstate.c              |   2 +-
 tests/qtest/migration-test.c |  93 +++++++++++++++++
 tests/test-vmstate.c         | 170 ++++++++++++++++++++++++++++++
 vl.c                         |  10 +-
 27 files changed, 659 insertions(+), 132 deletions(-)

-- 
2.24.1

[PULL 04/29] migration-test: introduce functions to handle string parameters

[Juan Quintela]

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 tests/qtest/migration-test.c | 37 ++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
index 81f65602de..26e2e77289 100644
--- a/tests/qtest/migration-test.c
+++ b/tests/qtest/migration-test.c
@@ -356,6 +356,43 @@ static void migrate_set_parameter_int(QTestState *who, const char *parameter,
     migrate_check_parameter_int(who, parameter, value);
 }
 
+static char *migrate_get_parameter_str(QTestState *who,
+                                       const char *parameter)
+{
+    QDict *rsp;
+    char *result;
+
+    rsp = wait_command(who, "{ 'execute': 'query-migrate-parameters' }");
+    result = g_strdup(qdict_get_str(rsp, parameter));
+    qobject_unref(rsp);
+    return result;
+}
+
+static void migrate_check_parameter_str(QTestState *who, const char *parameter,
+                                        const char *value)
+{
+    char *result;
+
+    result = migrate_get_parameter_str(who, parameter);
+    g_assert_cmpstr(result, ==, value);
+    g_free(result);
+}
+
+__attribute__((unused))
+static void migrate_set_parameter_str(QTestState *who, const char *parameter,
+                                      const char *value)
+{
+    QDict *rsp;
+
+    rsp = qtest_qmp(who,
+                    "{ 'execute': 'migrate-set-parameters',"
+                    "'arguments': { %s: %s } }",
+                    parameter, value);
+    g_assert(qdict_haskey(rsp, "return"));
+    qobject_unref(rsp);
+    migrate_check_parameter_str(who, parameter, value);
+}
+
 static void migrate_pause(QTestState *who)
 {
     QDict *rsp;
-- 
2.24.1