* [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1
@ 2017-06-05 12:38 Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 01/19] block: access copy_on_read with atomic ops Paolo Bonzini
` (20 more replies)
0 siblings, 21 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:38 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
v3->v4: rebased and included fixes in Fam's v2 pull request
new patch 18, fixing testsuite failures on OS X
Paolo Bonzini (19):
block: access copy_on_read with atomic ops
block: access quiesce_counter with atomic ops
block: access io_limits_disabled with atomic ops
block: access serialising_in_flight with atomic ops
block: access wakeup with atomic ops
block: access io_plugged with atomic ops
throttle-groups: only start one coroutine from drained_begin
throttle-groups: do not use qemu_co_enter_next
throttle-groups: protect throttled requests with a CoMutex
util: add stats64 module
block: use Stat64 for wr_highest_offset
block: access write_gen with atomics
block: protect tracked_requests and flush_queue with reqs_lock
block: introduce dirty_bitmap_mutex
migration/block: reset dirty bitmap before reading
block: protect modification of dirty bitmaps with a mutex
block: introduce block_account_one_io
block: split BlockAcctStats creation and setup
block: make accounting thread-safe
block.c | 9 +-
block/accounting.c | 78 ++++++++++-------
block/block-backend.c | 6 +-
block/dirty-bitmap.c | 112 ++++++++++++++++++++++--
block/io.c | 51 ++++++-----
block/mirror.c | 14 ++-
block/nfs.c | 4 +-
block/qapi.c | 2 +-
block/sheepdog.c | 3 +-
block/throttle-groups.c | 91 ++++++++++++++-----
blockdev.c | 48 ++--------
include/block/accounting.h | 11 ++-
include/block/block.h | 5 +-
include/block/block_int.h | 61 ++++++++-----
include/block/dirty-bitmap.h | 25 ++++--
include/qemu/stats64.h | 193 +++++++++++++++++++++++++++++++++++++++++
include/sysemu/block-backend.h | 10 +--
migration/block.c | 17 ++--
util/Makefile.objs | 1 +
util/stats64.c | 137 +++++++++++++++++++++++++++++
20 files changed, 693 insertions(+), 185 deletions(-)
create mode 100644 include/qemu/stats64.h
create mode 100644 util/stats64.c
--
2.13.0
^ permalink raw reply [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 01/19] block: access copy_on_read with atomic ops
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
@ 2017-06-05 12:38 ` Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 02/19] block: access quiesce_counter " Paolo Bonzini
` (19 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:38 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block.c | 6 ++++--
block/io.c | 8 ++++----
blockdev.c | 2 +-
include/block/block_int.h | 11 ++++++-----
4 files changed, 15 insertions(+), 12 deletions(-)
diff --git a/block.c b/block.c
index fa1d06d846..af6366bcef 100644
--- a/block.c
+++ b/block.c
@@ -1300,7 +1300,9 @@ static int bdrv_open_common(BlockDriverState *bs, BlockBackend *file,
goto fail_opts;
}
- assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */
+ /* bdrv_new() and bdrv_close() make it so */
+ assert(atomic_read(&bs->copy_on_read) == 0);
+
if (bs->open_flags & BDRV_O_COPY_ON_READ) {
if (!bs->read_only) {
bdrv_enable_copy_on_read(bs);
@@ -3063,7 +3065,7 @@ static void bdrv_close(BlockDriverState *bs)
g_free(bs->opaque);
bs->opaque = NULL;
- bs->copy_on_read = 0;
+ atomic_set(&bs->copy_on_read, 0);
bs->backing_file[0] = '\0';
bs->backing_format[0] = '\0';
bs->total_sectors = 0;
diff --git a/block/io.c b/block/io.c
index ed31810c0a..98c690f306 100644
--- a/block/io.c
+++ b/block/io.c
@@ -130,13 +130,13 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
*/
void bdrv_enable_copy_on_read(BlockDriverState *bs)
{
- bs->copy_on_read++;
+ atomic_inc(&bs->copy_on_read);
}
void bdrv_disable_copy_on_read(BlockDriverState *bs)
{
- assert(bs->copy_on_read > 0);
- bs->copy_on_read--;
+ int old = atomic_fetch_dec(&bs->copy_on_read);
+ assert(old >= 1);
}
/* Check if any requests are in-flight (including throttled requests) */
@@ -1144,7 +1144,7 @@ int coroutine_fn bdrv_co_preadv(BdrvChild *child,
bdrv_inc_in_flight(bs);
/* Don't do copy-on-read if we read data before write operation */
- if (bs->copy_on_read && !(flags & BDRV_REQ_NO_SERIALISING)) {
+ if (atomic_read(&bs->copy_on_read) && !(flags & BDRV_REQ_NO_SERIALISING)) {
flags |= BDRV_REQ_COPY_ON_READ;
}
diff --git a/blockdev.c b/blockdev.c
index 892d768574..335fbccf5c 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1791,7 +1791,7 @@ static void external_snapshot_commit(BlkActionState *common)
/* We don't need (or want) to use the transactional
* bdrv_reopen_multiple() across all the entries at once, because we
* don't want to abort all of them if one of them fails the reopen */
- if (!state->old_bs->copy_on_read) {
+ if (!atomic_read(&state->old_bs->copy_on_read)) {
bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
NULL);
}
diff --git a/include/block/block_int.h b/include/block/block_int.h
index e5eb473e53..5f99cdb0f6 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -595,11 +595,6 @@ struct BlockDriverState {
/* Protected by AioContext lock */
- /* If true, copy read backing sectors into image. Can be >1 if more
- * than one client has requested copy-on-read.
- */
- int copy_on_read;
-
/* If we are reading a disk image, give its size in sectors.
* Generally read-only; it is written to by load_vmstate and save_vmstate,
* but the block layer is quiescent during those.
@@ -633,6 +628,12 @@ struct BlockDriverState {
QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps;
+ /* If true, copy read backing sectors into image. Can be >1 if more
+ * than one client has requested copy-on-read. Accessed with atomic
+ * ops.
+ */
+ int copy_on_read;
+
/* do we need to tell the quest if we have a volatile write cache? */
int enable_write_cache;
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 02/19] block: access quiesce_counter with atomic ops
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 01/19] block: access copy_on_read with atomic ops Paolo Bonzini
@ 2017-06-05 12:38 ` Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 03/19] block: access io_limits_disabled " Paolo Bonzini
` (18 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:38 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block/io.c | 4 ++--
include/block/block_int.h | 1 +
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/block/io.c b/block/io.c
index 98c690f306..70643df494 100644
--- a/block/io.c
+++ b/block/io.c
@@ -241,7 +241,7 @@ void bdrv_drained_begin(BlockDriverState *bs)
return;
}
- if (!bs->quiesce_counter++) {
+ if (atomic_fetch_inc(&bs->quiesce_counter) == 0) {
aio_disable_external(bdrv_get_aio_context(bs));
bdrv_parent_drained_begin(bs);
}
@@ -252,7 +252,7 @@ void bdrv_drained_begin(BlockDriverState *bs)
void bdrv_drained_end(BlockDriverState *bs)
{
assert(bs->quiesce_counter > 0);
- if (--bs->quiesce_counter > 0) {
+ if (atomic_fetch_dec(&bs->quiesce_counter) > 1) {
return;
}
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 5f99cdb0f6..9691db35e9 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -637,6 +637,7 @@ struct BlockDriverState {
/* do we need to tell the quest if we have a volatile write cache? */
int enable_write_cache;
+ /* Accessed with atomic ops. */
int quiesce_counter;
};
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 03/19] block: access io_limits_disabled with atomic ops
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 01/19] block: access copy_on_read with atomic ops Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 02/19] block: access quiesce_counter " Paolo Bonzini
@ 2017-06-05 12:38 ` Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 04/19] block: access serialising_in_flight " Paolo Bonzini
` (17 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:38 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block/block-backend.c | 4 ++--
block/throttle-groups.c | 2 +-
include/sysemu/block-backend.h | 3 ++-
3 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/block/block-backend.c b/block/block-backend.c
index f3a60081a7..e50ec03f30 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1953,7 +1953,7 @@ static void blk_root_drained_begin(BdrvChild *child)
/* Note that blk->root may not be accessible here yet if we are just
* attaching to a BlockDriverState that is drained. Use child instead. */
- if (blk->public.io_limits_disabled++ == 0) {
+ if (atomic_fetch_inc(&blk->public.io_limits_disabled) == 0) {
throttle_group_restart_blk(blk);
}
}
@@ -1964,7 +1964,7 @@ static void blk_root_drained_end(BdrvChild *child)
assert(blk->quiesce_counter);
assert(blk->public.io_limits_disabled);
- --blk->public.io_limits_disabled;
+ atomic_dec(&blk->public.io_limits_disabled);
if (--blk->quiesce_counter == 0) {
if (blk->dev_ops && blk->dev_ops->drained_end) {
diff --git a/block/throttle-groups.c b/block/throttle-groups.c
index b73e7a800b..69bfbd44d9 100644
--- a/block/throttle-groups.c
+++ b/block/throttle-groups.c
@@ -240,7 +240,7 @@ static bool throttle_group_schedule_timer(BlockBackend *blk, bool is_write)
ThrottleGroup *tg = container_of(ts, ThrottleGroup, ts);
bool must_wait;
- if (blkp->io_limits_disabled) {
+ if (atomic_read(&blkp->io_limits_disabled)) {
return false;
}
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 840ad6134c..24b63d6b03 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -80,7 +80,8 @@ typedef struct BlockBackendPublic {
CoQueue throttled_reqs[2];
/* Nonzero if the I/O limits are currently being ignored; generally
- * it is zero. */
+ * it is zero. Accessed with atomic operations.
+ */
unsigned int io_limits_disabled;
/* The following fields are protected by the ThrottleGroup lock.
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 04/19] block: access serialising_in_flight with atomic ops
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (2 preceding siblings ...)
2017-06-05 12:38 ` [Qemu-devel] [PATCH 03/19] block: access io_limits_disabled " Paolo Bonzini
@ 2017-06-05 12:38 ` Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 05/19] block: access wakeup " Paolo Bonzini
` (16 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:38 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block/io.c | 6 +++---
include/block/block_int.h | 10 ++++++----
2 files changed, 9 insertions(+), 7 deletions(-)
diff --git a/block/io.c b/block/io.c
index 70643df494..d76202b452 100644
--- a/block/io.c
+++ b/block/io.c
@@ -375,7 +375,7 @@ void bdrv_drain_all(void)
static void tracked_request_end(BdrvTrackedRequest *req)
{
if (req->serialising) {
- req->bs->serialising_in_flight--;
+ atomic_dec(&req->bs->serialising_in_flight);
}
QLIST_REMOVE(req, list);
@@ -414,7 +414,7 @@ static void mark_request_serialising(BdrvTrackedRequest *req, uint64_t align)
- overlap_offset;
if (!req->serialising) {
- req->bs->serialising_in_flight++;
+ atomic_inc(&req->bs->serialising_in_flight);
req->serialising = true;
}
@@ -519,7 +519,7 @@ static bool coroutine_fn wait_serialising_requests(BdrvTrackedRequest *self)
bool retry;
bool waited = false;
- if (!bs->serialising_in_flight) {
+ if (!atomic_read(&bs->serialising_in_flight)) {
return false;
}
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 9691db35e9..e5f19eb24c 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -604,10 +604,6 @@ struct BlockDriverState {
/* Callback before write request is processed */
NotifierWithReturnList before_write_notifiers;
- /* number of in-flight requests; overall and serialising */
- unsigned int in_flight;
- unsigned int serialising_in_flight;
-
bool wakeup;
/* Offset after the highest byte written to */
@@ -634,6 +630,12 @@ struct BlockDriverState {
*/
int copy_on_read;
+ /* number of in-flight requests; overall and serialising.
+ * Accessed with atomic ops.
+ */
+ unsigned int in_flight;
+ unsigned int serialising_in_flight;
+
/* do we need to tell the quest if we have a volatile write cache? */
int enable_write_cache;
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 05/19] block: access wakeup with atomic ops
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (3 preceding siblings ...)
2017-06-05 12:38 ` [Qemu-devel] [PATCH 04/19] block: access serialising_in_flight " Paolo Bonzini
@ 2017-06-05 12:38 ` Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 06/19] block: access io_plugged " Paolo Bonzini
` (15 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:38 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block/io.c | 3 ++-
block/nfs.c | 4 +++-
block/sheepdog.c | 3 ++-
include/block/block.h | 5 +++--
include/block/block_int.h | 7 +++++--
5 files changed, 15 insertions(+), 7 deletions(-)
diff --git a/block/io.c b/block/io.c
index d76202b452..4a598299a9 100644
--- a/block/io.c
+++ b/block/io.c
@@ -501,7 +501,8 @@ static void dummy_bh_cb(void *opaque)
void bdrv_wakeup(BlockDriverState *bs)
{
- if (bs->wakeup) {
+ /* The barrier (or an atomic op) is in the caller. */
+ if (atomic_read(&bs->wakeup)) {
aio_bh_schedule_oneshot(qemu_get_aio_context(), dummy_bh_cb, NULL);
}
}
diff --git a/block/nfs.c b/block/nfs.c
index 848b2c0bb0..18c87d2f25 100644
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -730,7 +730,9 @@ nfs_get_allocated_file_size_cb(int ret, struct nfs_context *nfs, void *data,
if (task->ret < 0) {
error_report("NFS Error: %s", nfs_get_error(nfs));
}
- task->complete = 1;
+
+ /* Set task->complete before reading bs->wakeup. */
+ atomic_mb_set(&task->complete, 1);
bdrv_wakeup(task->bs);
}
diff --git a/block/sheepdog.c b/block/sheepdog.c
index a18315a1ca..5ebf5d9fbb 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -698,7 +698,8 @@ out:
srco->co = NULL;
srco->ret = ret;
- srco->finished = true;
+ /* Set srco->finished before reading bs->wakeup. */
+ atomic_mb_set(&srco->finished, true);
if (srco->bs) {
bdrv_wakeup(srco->bs);
}
diff --git a/include/block/block.h b/include/block/block.h
index 9b355e92d8..a4f09df95a 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -402,7 +402,8 @@ void bdrv_drain_all(void);
* block_job_defer_to_main_loop for how to do it). \
*/ \
assert(!bs_->wakeup); \
- bs_->wakeup = true; \
+ /* Set bs->wakeup before evaluating cond. */ \
+ atomic_mb_set(&bs_->wakeup, true); \
while (busy_) { \
if ((cond)) { \
waited_ = busy_ = true; \
@@ -414,7 +415,7 @@ void bdrv_drain_all(void);
waited_ |= busy_; \
} \
} \
- bs_->wakeup = false; \
+ atomic_set(&bs_->wakeup, false); \
} \
waited_; })
diff --git a/include/block/block_int.h b/include/block/block_int.h
index e5f19eb24c..dd09e0071b 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -604,8 +604,6 @@ struct BlockDriverState {
/* Callback before write request is processed */
NotifierWithReturnList before_write_notifiers;
- bool wakeup;
-
/* Offset after the highest byte written to */
uint64_t wr_highest_offset;
@@ -636,6 +634,11 @@ struct BlockDriverState {
unsigned int in_flight;
unsigned int serialising_in_flight;
+ /* Internal to BDRV_POLL_WHILE and bdrv_wakeup. Accessed with atomic
+ * ops.
+ */
+ bool wakeup;
+
/* do we need to tell the quest if we have a volatile write cache? */
int enable_write_cache;
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 06/19] block: access io_plugged with atomic ops
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (4 preceding siblings ...)
2017-06-05 12:38 ` [Qemu-devel] [PATCH 05/19] block: access wakeup " Paolo Bonzini
@ 2017-06-05 12:38 ` Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 07/19] throttle-groups: only start one coroutine from drained_begin Paolo Bonzini
` (14 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:38 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block/io.c | 4 ++--
include/block/block_int.h | 8 +++++---
2 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/block/io.c b/block/io.c
index 4a598299a9..bb1c9c5432 100644
--- a/block/io.c
+++ b/block/io.c
@@ -2645,7 +2645,7 @@ void bdrv_io_plug(BlockDriverState *bs)
bdrv_io_plug(child->bs);
}
- if (bs->io_plugged++ == 0) {
+ if (atomic_fetch_inc(&bs->io_plugged) == 0) {
BlockDriver *drv = bs->drv;
if (drv && drv->bdrv_io_plug) {
drv->bdrv_io_plug(bs);
@@ -2658,7 +2658,7 @@ void bdrv_io_unplug(BlockDriverState *bs)
BdrvChild *child;
assert(bs->io_plugged);
- if (--bs->io_plugged == 0) {
+ if (atomic_fetch_dec(&bs->io_plugged) == 1) {
BlockDriver *drv = bs->drv;
if (drv && drv->bdrv_io_unplug) {
drv->bdrv_io_unplug(bs);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index dd09e0071b..d11417e60a 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -611,9 +611,6 @@ struct BlockDriverState {
uint64_t write_threshold_offset;
NotifierWithReturn write_threshold_notifier;
- /* counter for nested bdrv_io_plug */
- unsigned io_plugged;
-
QLIST_HEAD(, BdrvTrackedRequest) tracked_requests;
CoQueue flush_queue; /* Serializing flush queue */
bool active_flush_req; /* Flush request in flight? */
@@ -639,6 +636,11 @@ struct BlockDriverState {
*/
bool wakeup;
+ /* counter for nested bdrv_io_plug.
+ * Accessed with atomic ops.
+ */
+ unsigned io_plugged;
+
/* do we need to tell the quest if we have a volatile write cache? */
int enable_write_cache;
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 07/19] throttle-groups: only start one coroutine from drained_begin
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (5 preceding siblings ...)
2017-06-05 12:38 ` [Qemu-devel] [PATCH 06/19] block: access io_plugged " Paolo Bonzini
@ 2017-06-05 12:38 ` Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 08/19] throttle-groups: do not use qemu_co_enter_next Paolo Bonzini
` (13 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:38 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
Starting all waiting coroutines from bdrv_drain_all is unnecessary;
throttle_group_co_io_limits_intercept calls schedule_next_request as
soon as the coroutine restarts, which in turn will restart the next
request if possible.
If we only start the first request and let the coroutines dance from
there the code is simpler and there is more reuse between
throttle_group_config, throttle_group_restart_blk and timer_cb. The
next patch will benefit from this.
We also stop accessing from throttle_group_restart_blk the
blkp->throttled_reqs CoQueues even when there was no
attached throttling group. This worked but is not pretty.
The only thing that can interrupt the dance is the QEMU_CLOCK_VIRTUAL
timer when switching from one block device to the next, because the
timer is set to "now + 1" but QEMU_CLOCK_VIRTUAL might not be running.
Set that timer to point in the present ("now") rather than the future
and things work.
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block/throttle-groups.c | 45 +++++++++++++++++++++++++--------------------
1 file changed, 25 insertions(+), 20 deletions(-)
diff --git a/block/throttle-groups.c b/block/throttle-groups.c
index 69bfbd44d9..85169ecfb0 100644
--- a/block/throttle-groups.c
+++ b/block/throttle-groups.c
@@ -292,7 +292,7 @@ static void schedule_next_request(BlockBackend *blk, bool is_write)
} else {
ThrottleTimers *tt = &blk_get_public(token)->throttle_timers;
int64_t now = qemu_clock_get_ns(tt->clock_type);
- timer_mod(tt->timers[is_write], now + 1);
+ timer_mod(tt->timers[is_write], now);
tg->any_timer_armed[is_write] = true;
}
tg->tokens[is_write] = token;
@@ -340,15 +340,32 @@ void coroutine_fn throttle_group_co_io_limits_intercept(BlockBackend *blk,
qemu_mutex_unlock(&tg->lock);
}
+static void throttle_group_restart_queue(BlockBackend *blk, bool is_write)
+{
+ BlockBackendPublic *blkp = blk_get_public(blk);
+ ThrottleGroup *tg = container_of(blkp->throttle_state, ThrottleGroup, ts);
+ bool empty_queue;
+
+ aio_context_acquire(blk_get_aio_context(blk));
+ empty_queue = !qemu_co_enter_next(&blkp->throttled_reqs[is_write]);
+ aio_context_release(blk_get_aio_context(blk));
+
+ /* If the request queue was empty then we have to take care of
+ * scheduling the next one */
+ if (empty_queue) {
+ qemu_mutex_lock(&tg->lock);
+ schedule_next_request(blk, is_write);
+ qemu_mutex_unlock(&tg->lock);
+ }
+}
+
void throttle_group_restart_blk(BlockBackend *blk)
{
BlockBackendPublic *blkp = blk_get_public(blk);
- int i;
- for (i = 0; i < 2; i++) {
- while (qemu_co_enter_next(&blkp->throttled_reqs[i])) {
- ;
- }
+ if (blkp->throttle_state) {
+ throttle_group_restart_queue(blk, 0);
+ throttle_group_restart_queue(blk, 1);
}
}
@@ -376,8 +393,7 @@ void throttle_group_config(BlockBackend *blk, ThrottleConfig *cfg)
throttle_config(ts, tt, cfg);
qemu_mutex_unlock(&tg->lock);
- qemu_co_enter_next(&blkp->throttled_reqs[0]);
- qemu_co_enter_next(&blkp->throttled_reqs[1]);
+ throttle_group_restart_blk(blk);
}
/* Get the throttle configuration from a particular group. Similar to
@@ -408,7 +424,6 @@ static void timer_cb(BlockBackend *blk, bool is_write)
BlockBackendPublic *blkp = blk_get_public(blk);
ThrottleState *ts = blkp->throttle_state;
ThrottleGroup *tg = container_of(ts, ThrottleGroup, ts);
- bool empty_queue;
/* The timer has just been fired, so we can update the flag */
qemu_mutex_lock(&tg->lock);
@@ -416,17 +431,7 @@ static void timer_cb(BlockBackend *blk, bool is_write)
qemu_mutex_unlock(&tg->lock);
/* Run the request that was waiting for this timer */
- aio_context_acquire(blk_get_aio_context(blk));
- empty_queue = !qemu_co_enter_next(&blkp->throttled_reqs[is_write]);
- aio_context_release(blk_get_aio_context(blk));
-
- /* If the request queue was empty then we have to take care of
- * scheduling the next one */
- if (empty_queue) {
- qemu_mutex_lock(&tg->lock);
- schedule_next_request(blk, is_write);
- qemu_mutex_unlock(&tg->lock);
- }
+ throttle_group_restart_queue(blk, is_write);
}
static void read_timer_cb(void *opaque)
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 08/19] throttle-groups: do not use qemu_co_enter_next
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (6 preceding siblings ...)
2017-06-05 12:38 ` [Qemu-devel] [PATCH 07/19] throttle-groups: only start one coroutine from drained_begin Paolo Bonzini
@ 2017-06-05 12:38 ` Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 09/19] throttle-groups: protect throttled requests with a CoMutex Paolo Bonzini
` (12 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:38 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
Prepare for removing this function; always restart throttled requests
from coroutine context. This will matter when restarting throttled
requests will have to acquire a CoMutex.
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block/throttle-groups.c | 42 +++++++++++++++++++++++++++++++++++++-----
1 file changed, 37 insertions(+), 5 deletions(-)
diff --git a/block/throttle-groups.c b/block/throttle-groups.c
index 85169ecfb0..8bf1031efa 100644
--- a/block/throttle-groups.c
+++ b/block/throttle-groups.c
@@ -260,6 +260,20 @@ static bool throttle_group_schedule_timer(BlockBackend *blk, bool is_write)
return must_wait;
}
+/* Start the next pending I/O request for a BlockBackend. Return whether
+ * any request was actually pending.
+ *
+ * @blk: the current BlockBackend
+ * @is_write: the type of operation (read/write)
+ */
+static bool coroutine_fn throttle_group_co_restart_queue(BlockBackend *blk,
+ bool is_write)
+{
+ BlockBackendPublic *blkp = blk_get_public(blk);
+
+ return qemu_co_queue_next(&blkp->throttled_reqs[is_write]);
+}
+
/* Look for the next pending I/O request and schedule it.
*
* This assumes that tg->lock is held.
@@ -287,7 +301,7 @@ static void schedule_next_request(BlockBackend *blk, bool is_write)
if (!must_wait) {
/* Give preference to requests from the current blk */
if (qemu_in_coroutine() &&
- qemu_co_queue_next(&blkp->throttled_reqs[is_write])) {
+ throttle_group_co_restart_queue(blk, is_write)) {
token = blk;
} else {
ThrottleTimers *tt = &blk_get_public(token)->throttle_timers;
@@ -340,15 +354,21 @@ void coroutine_fn throttle_group_co_io_limits_intercept(BlockBackend *blk,
qemu_mutex_unlock(&tg->lock);
}
-static void throttle_group_restart_queue(BlockBackend *blk, bool is_write)
+typedef struct {
+ BlockBackend *blk;
+ bool is_write;
+} RestartData;
+
+static void coroutine_fn throttle_group_restart_queue_entry(void *opaque)
{
+ RestartData *data = opaque;
+ BlockBackend *blk = data->blk;
+ bool is_write = data->is_write;
BlockBackendPublic *blkp = blk_get_public(blk);
ThrottleGroup *tg = container_of(blkp->throttle_state, ThrottleGroup, ts);
bool empty_queue;
- aio_context_acquire(blk_get_aio_context(blk));
- empty_queue = !qemu_co_enter_next(&blkp->throttled_reqs[is_write]);
- aio_context_release(blk_get_aio_context(blk));
+ empty_queue = !throttle_group_co_restart_queue(blk, is_write);
/* If the request queue was empty then we have to take care of
* scheduling the next one */
@@ -359,6 +379,18 @@ static void throttle_group_restart_queue(BlockBackend *blk, bool is_write)
}
}
+static void throttle_group_restart_queue(BlockBackend *blk, bool is_write)
+{
+ Coroutine *co;
+ RestartData rd = {
+ .blk = blk,
+ .is_write = is_write
+ };
+
+ co = qemu_coroutine_create(throttle_group_restart_queue_entry, &rd);
+ aio_co_enter(blk_get_aio_context(blk), co);
+}
+
void throttle_group_restart_blk(BlockBackend *blk)
{
BlockBackendPublic *blkp = blk_get_public(blk);
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 09/19] throttle-groups: protect throttled requests with a CoMutex
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (7 preceding siblings ...)
2017-06-05 12:38 ` [Qemu-devel] [PATCH 08/19] throttle-groups: do not use qemu_co_enter_next Paolo Bonzini
@ 2017-06-05 12:38 ` Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 10/19] util: add stats64 module Paolo Bonzini
` (11 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:38 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
Another possibility is to use tg->lock, which we're holding anyway in
both schedule_next_request and throttle_group_co_io_limits_intercept.
This would require open-coding the CoQueue however, so I've chosen this
alternative.
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block/block-backend.c | 1 +
block/throttle-groups.c | 12 ++++++++++--
include/sysemu/block-backend.h | 7 ++-----
3 files changed, 13 insertions(+), 7 deletions(-)
diff --git a/block/block-backend.c b/block/block-backend.c
index e50ec03f30..be2ddf173a 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -216,6 +216,7 @@ BlockBackend *blk_new(uint64_t perm, uint64_t shared_perm)
blk->shared_perm = shared_perm;
blk_set_enable_write_cache(blk, true);
+ qemu_co_mutex_init(&blk->public.throttled_reqs_lock);
qemu_co_queue_init(&blk->public.throttled_reqs[0]);
qemu_co_queue_init(&blk->public.throttled_reqs[1]);
diff --git a/block/throttle-groups.c b/block/throttle-groups.c
index 8bf1031efa..a181cb1dee 100644
--- a/block/throttle-groups.c
+++ b/block/throttle-groups.c
@@ -270,8 +270,13 @@ static bool coroutine_fn throttle_group_co_restart_queue(BlockBackend *blk,
bool is_write)
{
BlockBackendPublic *blkp = blk_get_public(blk);
+ bool ret;
- return qemu_co_queue_next(&blkp->throttled_reqs[is_write]);
+ qemu_co_mutex_lock(&blkp->throttled_reqs_lock);
+ ret = qemu_co_queue_next(&blkp->throttled_reqs[is_write]);
+ qemu_co_mutex_unlock(&blkp->throttled_reqs_lock);
+
+ return ret;
}
/* Look for the next pending I/O request and schedule it.
@@ -340,7 +345,10 @@ void coroutine_fn throttle_group_co_io_limits_intercept(BlockBackend *blk,
if (must_wait || blkp->pending_reqs[is_write]) {
blkp->pending_reqs[is_write]++;
qemu_mutex_unlock(&tg->lock);
- qemu_co_queue_wait(&blkp->throttled_reqs[is_write], NULL);
+ qemu_co_mutex_lock(&blkp->throttled_reqs_lock);
+ qemu_co_queue_wait(&blkp->throttled_reqs[is_write],
+ &blkp->throttled_reqs_lock);
+ qemu_co_mutex_unlock(&blkp->throttled_reqs_lock);
qemu_mutex_lock(&tg->lock);
blkp->pending_reqs[is_write]--;
}
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 24b63d6b03..999eb2333a 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -72,11 +72,8 @@ typedef struct BlockDevOps {
* fields that must be public. This is in particular for QLIST_ENTRY() and
* friends so that BlockBackends can be kept in lists outside block-backend.c */
typedef struct BlockBackendPublic {
- /* I/O throttling has its own locking, but also some fields are
- * protected by the AioContext lock.
- */
-
- /* Protected by AioContext lock. */
+ /* throttled_reqs_lock protects the CoQueues for throttled requests. */
+ CoMutex throttled_reqs_lock;
CoQueue throttled_reqs[2];
/* Nonzero if the I/O limits are currently being ignored; generally
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 10/19] util: add stats64 module
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (8 preceding siblings ...)
2017-06-05 12:38 ` [Qemu-devel] [PATCH 09/19] throttle-groups: protect throttled requests with a CoMutex Paolo Bonzini
@ 2017-06-05 12:38 ` Paolo Bonzini
2017-06-05 12:39 ` [Qemu-devel] [PATCH 11/19] block: use Stat64 for wr_highest_offset Paolo Bonzini
` (10 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:38 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
This module provides fast paths for 64-bit atomic operations on machines
that only have 32-bit atomic access.
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
---
include/qemu/stats64.h | 193 +++++++++++++++++++++++++++++++++++++++++++++++++
util/Makefile.objs | 1 +
util/stats64.c | 137 +++++++++++++++++++++++++++++++++++
3 files changed, 331 insertions(+)
create mode 100644 include/qemu/stats64.h
create mode 100644 util/stats64.c
diff --git a/include/qemu/stats64.h b/include/qemu/stats64.h
new file mode 100644
index 0000000000..4a357b3e9d
--- /dev/null
+++ b/include/qemu/stats64.h
@@ -0,0 +1,193 @@
+/*
+ * Atomic operations on 64-bit quantities.
+ *
+ * Copyright (C) 2017 Red Hat, Inc.
+ *
+ * Author: Paolo Bonzini <pbonzini@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef QEMU_STATS64_H
+#define QEMU_STATS64_H 1
+
+#include "qemu/atomic.h"
+
+/* This provides atomic operations on 64-bit type, using a reader-writer
+ * spinlock on architectures that do not have 64-bit accesses. Even on
+ * those architectures, it tries hard not to take the lock.
+ */
+
+typedef struct Stat64 {
+#ifdef CONFIG_ATOMIC64
+ uint64_t value;
+#else
+ uint32_t low, high;
+ uint32_t lock;
+#endif
+} Stat64;
+
+#ifdef CONFIG_ATOMIC64
+static inline void stat64_init(Stat64 *s, uint64_t value)
+{
+ /* This is not guaranteed to be atomic! */
+ *s = (Stat64) { value };
+}
+
+static inline uint64_t stat64_get(const Stat64 *s)
+{
+ return atomic_read__nocheck(&s->value);
+}
+
+static inline void stat64_add(Stat64 *s, uint64_t value)
+{
+ atomic_add(&s->value, value);
+}
+
+static inline void stat64_min(Stat64 *s, uint64_t value)
+{
+ uint64_t orig = atomic_read__nocheck(&s->value);
+ while (orig > value) {
+ orig = atomic_cmpxchg__nocheck(&s->value, orig, value);
+ }
+}
+
+static inline void stat64_max(Stat64 *s, uint64_t value)
+{
+ uint64_t orig = atomic_read__nocheck(&s->value);
+ while (orig < value) {
+ orig = atomic_cmpxchg__nocheck(&s->value, orig, value);
+ }
+}
+#else
+uint64_t stat64_get(const Stat64 *s);
+bool stat64_min_slow(Stat64 *s, uint64_t value);
+bool stat64_max_slow(Stat64 *s, uint64_t value);
+bool stat64_add32_carry(Stat64 *s, uint32_t low, uint32_t high);
+
+static inline void stat64_init(Stat64 *s, uint64_t value)
+{
+ /* This is not guaranteed to be atomic! */
+ *s = (Stat64) { .low = value, .high = value >> 32, .lock = 0 };
+}
+
+static inline void stat64_add(Stat64 *s, uint64_t value)
+{
+ uint32_t low, high;
+ high = value >> 32;
+ low = (uint32_t) value;
+ if (!low) {
+ if (high) {
+ atomic_add(&s->high, high);
+ }
+ return;
+ }
+
+ for (;;) {
+ uint32_t orig = s->low;
+ uint32_t result = orig + low;
+ uint32_t old;
+
+ if (result < low || high) {
+ /* If the high part is affected, take the lock. */
+ if (stat64_add32_carry(s, low, high)) {
+ return;
+ }
+ continue;
+ }
+
+ /* No carry, try with a 32-bit cmpxchg. The result is independent of
+ * the high 32 bits, so it can race just fine with stat64_add32_carry
+ * and even stat64_get!
+ */
+ old = atomic_cmpxchg(&s->low, orig, result);
+ if (orig == old) {
+ return;
+ }
+ }
+}
+
+static inline void stat64_min(Stat64 *s, uint64_t value)
+{
+ uint32_t low, high;
+ uint32_t orig_low, orig_high;
+
+ high = value >> 32;
+ low = (uint32_t) value;
+ do {
+ orig_high = atomic_read(&s->high);
+ if (orig_high < high) {
+ return;
+ }
+
+ if (orig_high == high) {
+ /* High 32 bits are equal. Read low after high, otherwise we
+ * can get a false positive (e.g. 0x1235,0x0000 changes to
+ * 0x1234,0x8000 and we read it as 0x1234,0x0000). Pairs with
+ * the write barrier in stat64_min_slow.
+ */
+ smp_rmb();
+ orig_low = atomic_read(&s->low);
+ if (orig_low <= low) {
+ return;
+ }
+
+ /* See if we were lucky and a writer raced against us. The
+ * barrier is theoretically unnecessary, but if we remove it
+ * we may miss being lucky.
+ */
+ smp_rmb();
+ orig_high = atomic_read(&s->high);
+ if (orig_high < high) {
+ return;
+ }
+ }
+
+ /* If the value changes in any way, we have to take the lock. */
+ } while (!stat64_min_slow(s, value));
+}
+
+static inline void stat64_max(Stat64 *s, uint64_t value)
+{
+ uint32_t low, high;
+ uint32_t orig_low, orig_high;
+
+ high = value >> 32;
+ low = (uint32_t) value;
+ do {
+ orig_high = atomic_read(&s->high);
+ if (orig_high > high) {
+ return;
+ }
+
+ if (orig_high == high) {
+ /* High 32 bits are equal. Read low after high, otherwise we
+ * can get a false positive (e.g. 0x1234,0x8000 changes to
+ * 0x1235,0x0000 and we read it as 0x1235,0x8000). Pairs with
+ * the write barrier in stat64_max_slow.
+ */
+ smp_rmb();
+ orig_low = atomic_read(&s->low);
+ if (orig_low >= low) {
+ return;
+ }
+
+ /* See if we were lucky and a writer raced against us. The
+ * barrier is theoretically unnecessary, but if we remove it
+ * we may miss being lucky.
+ */
+ smp_rmb();
+ orig_high = atomic_read(&s->high);
+ if (orig_high > high) {
+ return;
+ }
+ }
+
+ /* If the value changes in any way, we have to take the lock. */
+ } while (!stat64_max_slow(s, value));
+}
+
+#endif
+
+#endif
diff --git a/util/Makefile.objs b/util/Makefile.objs
index c6205ebf86..8a333d3dd7 100644
--- a/util/Makefile.objs
+++ b/util/Makefile.objs
@@ -42,4 +42,5 @@ util-obj-y += log.o
util-obj-y += qdist.o
util-obj-y += qht.o
util-obj-y += range.o
+util-obj-y += stats64.o
util-obj-y += systemd.o
diff --git a/util/stats64.c b/util/stats64.c
new file mode 100644
index 0000000000..9968fcceac
--- /dev/null
+++ b/util/stats64.c
@@ -0,0 +1,137 @@
+/*
+ * Atomic operations on 64-bit quantities.
+ *
+ * Copyright (C) 2017 Red Hat, Inc.
+ *
+ * Author: Paolo Bonzini <pbonzini@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/atomic.h"
+#include "qemu/stats64.h"
+#include "qemu/processor.h"
+
+#ifndef CONFIG_ATOMIC64
+static inline void stat64_rdlock(Stat64 *s)
+{
+ /* Keep out incoming writers to avoid them starving us. */
+ atomic_add(&s->lock, 2);
+
+ /* If there is a concurrent writer, wait for it. */
+ while (atomic_read(&s->lock) & 1) {
+ cpu_relax();
+ }
+}
+
+static inline void stat64_rdunlock(Stat64 *s)
+{
+ atomic_sub(&s->lock, 2);
+}
+
+static inline bool stat64_wrtrylock(Stat64 *s)
+{
+ return atomic_cmpxchg(&s->lock, 0, 1) == 0;
+}
+
+static inline void stat64_wrunlock(Stat64 *s)
+{
+ atomic_dec(&s->lock);
+}
+
+uint64_t stat64_get(const Stat64 *s)
+{
+ uint32_t high, low;
+
+ stat64_rdlock((Stat64 *)s);
+
+ /* 64-bit writes always take the lock, so we can read in
+ * any order.
+ */
+ high = atomic_read(&s->high);
+ low = atomic_read(&s->low);
+ stat64_rdunlock((Stat64 *)s);
+
+ return ((uint64_t)high << 32) | low;
+}
+
+bool stat64_add32_carry(Stat64 *s, uint32_t low, uint32_t high)
+{
+ uint32_t old;
+
+ if (!stat64_wrtrylock(s)) {
+ cpu_relax();
+ return false;
+ }
+
+ /* 64-bit reads always take the lock, so they don't care about the
+ * order of our update. By updating s->low first, we can check
+ * whether we have to carry into s->high.
+ */
+ old = atomic_fetch_add(&s->low, low);
+ high += (old + low) < old;
+ atomic_add(&s->high, high);
+ stat64_wrunlock(s);
+ return true;
+}
+
+bool stat64_min_slow(Stat64 *s, uint64_t value)
+{
+ uint32_t high, low;
+ uint64_t orig;
+
+ if (!stat64_wrtrylock(s)) {
+ cpu_relax();
+ return false;
+ }
+
+ high = atomic_read(&s->high);
+ low = atomic_read(&s->low);
+
+ orig = ((uint64_t)high << 32) | low;
+ if (orig < value) {
+ /* We have to set low before high, just like stat64_min reads
+ * high before low. The value may become higher temporarily, but
+ * stat64_get does not notice (it takes the lock) and the only ill
+ * effect on stat64_min is that the slow path may be triggered
+ * unnecessarily.
+ */
+ atomic_set(&s->low, (uint32_t)value);
+ smp_wmb();
+ atomic_set(&s->high, value >> 32);
+ }
+ stat64_wrunlock(s);
+ return true;
+}
+
+bool stat64_max_slow(Stat64 *s, uint64_t value)
+{
+ uint32_t high, low;
+ uint64_t orig;
+
+ if (!stat64_wrtrylock(s)) {
+ cpu_relax();
+ return false;
+ }
+
+ high = atomic_read(&s->high);
+ low = atomic_read(&s->low);
+
+ orig = ((uint64_t)high << 32) | low;
+ if (orig > value) {
+ /* We have to set low before high, just like stat64_max reads
+ * high before low. The value may become lower temporarily, but
+ * stat64_get does not notice (it takes the lock) and the only ill
+ * effect on stat64_max is that the slow path may be triggered
+ * unnecessarily.
+ */
+ atomic_set(&s->low, (uint32_t)value);
+ smp_wmb();
+ atomic_set(&s->high, value >> 32);
+ }
+ stat64_wrunlock(s);
+ return true;
+}
+#endif
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 11/19] block: use Stat64 for wr_highest_offset
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (9 preceding siblings ...)
2017-06-05 12:38 ` [Qemu-devel] [PATCH 10/19] util: add stats64 module Paolo Bonzini
@ 2017-06-05 12:39 ` Paolo Bonzini
2017-06-05 12:39 ` [Qemu-devel] [PATCH 12/19] block: access write_gen with atomics Paolo Bonzini
` (9 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:39 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block/io.c | 4 +---
block/qapi.c | 2 +-
include/block/block_int.h | 7 ++++---
3 files changed, 6 insertions(+), 7 deletions(-)
diff --git a/block/io.c b/block/io.c
index bb1c9c5432..bc69b4cecd 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1405,9 +1405,7 @@ static int coroutine_fn bdrv_aligned_pwritev(BdrvChild *child,
++bs->write_gen;
bdrv_set_dirty(bs, start_sector, end_sector - start_sector);
- if (bs->wr_highest_offset < offset + bytes) {
- bs->wr_highest_offset = offset + bytes;
- }
+ stat64_max(&bs->wr_highest_offset, offset + bytes);
if (ret >= 0) {
bs->total_sectors = MAX(bs->total_sectors, end_sector);
diff --git a/block/qapi.c b/block/qapi.c
index a40922ea26..14b60ae66c 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -441,7 +441,7 @@ static BlockStats *bdrv_query_bds_stats(const BlockDriverState *bs,
s->node_name = g_strdup(bdrv_get_node_name(bs));
}
- s->stats->wr_highest_offset = bs->wr_highest_offset;
+ s->stats->wr_highest_offset = stat64_get(&bs->wr_highest_offset);
if (bs->file) {
s->has_parent = true;
diff --git a/include/block/block_int.h b/include/block/block_int.h
index d11417e60a..8f36d1fc1d 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -29,6 +29,7 @@
#include "qemu/option.h"
#include "qemu/queue.h"
#include "qemu/coroutine.h"
+#include "qemu/stats64.h"
#include "qemu/timer.h"
#include "qapi-types.h"
#include "qemu/hbitmap.h"
@@ -604,9 +605,6 @@ struct BlockDriverState {
/* Callback before write request is processed */
NotifierWithReturnList before_write_notifiers;
- /* Offset after the highest byte written to */
- uint64_t wr_highest_offset;
-
/* threshold limit for writes, in bytes. "High water mark". */
uint64_t write_threshold_offset;
NotifierWithReturn write_threshold_notifier;
@@ -619,6 +617,9 @@ struct BlockDriverState {
QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps;
+ /* Offset after the highest byte written to */
+ Stat64 wr_highest_offset;
+
/* If true, copy read backing sectors into image. Can be >1 if more
* than one client has requested copy-on-read. Accessed with atomic
* ops.
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 12/19] block: access write_gen with atomics
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (10 preceding siblings ...)
2017-06-05 12:39 ` [Qemu-devel] [PATCH 11/19] block: use Stat64 for wr_highest_offset Paolo Bonzini
@ 2017-06-05 12:39 ` Paolo Bonzini
2017-06-05 12:39 ` [Qemu-devel] [PATCH 13/19] block: protect tracked_requests and flush_queue with reqs_lock Paolo Bonzini
` (8 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:39 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block.c | 2 +-
block/io.c | 6 +++---
include/block/block_int.h | 2 +-
3 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/block.c b/block.c
index af6366bcef..361005cba9 100644
--- a/block.c
+++ b/block.c
@@ -3424,7 +3424,7 @@ int bdrv_truncate(BdrvChild *child, int64_t offset, Error **errp)
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
bdrv_dirty_bitmap_truncate(bs);
bdrv_parent_cb_resize(bs);
- ++bs->write_gen;
+ atomic_inc(&bs->write_gen);
}
return ret;
}
diff --git a/block/io.c b/block/io.c
index bc69b4cecd..036f5a4870 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1402,7 +1402,7 @@ static int coroutine_fn bdrv_aligned_pwritev(BdrvChild *child,
}
bdrv_debug_event(bs, BLKDBG_PWRITEV_DONE);
- ++bs->write_gen;
+ atomic_inc(&bs->write_gen);
bdrv_set_dirty(bs, start_sector, end_sector - start_sector);
stat64_max(&bs->wr_highest_offset, offset + bytes);
@@ -2291,7 +2291,7 @@ int coroutine_fn bdrv_co_flush(BlockDriverState *bs)
goto early_exit;
}
- current_gen = bs->write_gen;
+ current_gen = atomic_read(&bs->write_gen);
/* Wait until any previous flushes are completed */
while (bs->active_flush_req) {
@@ -2516,7 +2516,7 @@ int coroutine_fn bdrv_co_pdiscard(BlockDriverState *bs, int64_t offset,
}
ret = 0;
out:
- ++bs->write_gen;
+ atomic_inc(&bs->write_gen);
bdrv_set_dirty(bs, req.offset >> BDRV_SECTOR_BITS,
req.bytes >> BDRV_SECTOR_BITS);
tracked_request_end(&req);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 8f36d1fc1d..8a9bc0bebc 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -612,7 +612,6 @@ struct BlockDriverState {
QLIST_HEAD(, BdrvTrackedRequest) tracked_requests;
CoQueue flush_queue; /* Serializing flush queue */
bool active_flush_req; /* Flush request in flight? */
- unsigned int write_gen; /* Current data generation */
unsigned int flushed_gen; /* Flushed write generation */
QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps;
@@ -647,6 +646,7 @@ struct BlockDriverState {
/* Accessed with atomic ops. */
int quiesce_counter;
+ unsigned int write_gen; /* Current data generation */
};
struct BlockBackendRootState {
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 13/19] block: protect tracked_requests and flush_queue with reqs_lock
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (11 preceding siblings ...)
2017-06-05 12:39 ` [Qemu-devel] [PATCH 12/19] block: access write_gen with atomics Paolo Bonzini
@ 2017-06-05 12:39 ` Paolo Bonzini
2017-06-05 12:39 ` [Qemu-devel] [PATCH 14/19] block: introduce dirty_bitmap_mutex Paolo Bonzini
` (7 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:39 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block.c | 1 +
block/io.c | 16 ++++++++++++++--
include/block/block_int.h | 14 +++++++++-----
3 files changed, 24 insertions(+), 7 deletions(-)
diff --git a/block.c b/block.c
index 361005cba9..a5cbd4540f 100644
--- a/block.c
+++ b/block.c
@@ -320,6 +320,7 @@ BlockDriverState *bdrv_new(void)
QLIST_INIT(&bs->op_blockers[i]);
}
notifier_with_return_list_init(&bs->before_write_notifiers);
+ qemu_co_mutex_init(&bs->reqs_lock);
bs->refcnt = 1;
bs->aio_context = qemu_get_aio_context();
diff --git a/block/io.c b/block/io.c
index 036f5a4870..91611ffb2a 100644
--- a/block/io.c
+++ b/block/io.c
@@ -378,8 +378,10 @@ static void tracked_request_end(BdrvTrackedRequest *req)
atomic_dec(&req->bs->serialising_in_flight);
}
+ qemu_co_mutex_lock(&req->bs->reqs_lock);
QLIST_REMOVE(req, list);
qemu_co_queue_restart_all(&req->wait_queue);
+ qemu_co_mutex_unlock(&req->bs->reqs_lock);
}
/**
@@ -404,7 +406,9 @@ static void tracked_request_begin(BdrvTrackedRequest *req,
qemu_co_queue_init(&req->wait_queue);
+ qemu_co_mutex_lock(&bs->reqs_lock);
QLIST_INSERT_HEAD(&bs->tracked_requests, req, list);
+ qemu_co_mutex_unlock(&bs->reqs_lock);
}
static void mark_request_serialising(BdrvTrackedRequest *req, uint64_t align)
@@ -526,6 +530,7 @@ static bool coroutine_fn wait_serialising_requests(BdrvTrackedRequest *self)
do {
retry = false;
+ qemu_co_mutex_lock(&bs->reqs_lock);
QLIST_FOREACH(req, &bs->tracked_requests, list) {
if (req == self || (!req->serialising && !self->serialising)) {
continue;
@@ -544,7 +549,7 @@ static bool coroutine_fn wait_serialising_requests(BdrvTrackedRequest *self)
* (instead of producing a deadlock in the former case). */
if (!req->waiting_for) {
self->waiting_for = req;
- qemu_co_queue_wait(&req->wait_queue, NULL);
+ qemu_co_queue_wait(&req->wait_queue, &bs->reqs_lock);
self->waiting_for = NULL;
retry = true;
waited = true;
@@ -552,6 +557,7 @@ static bool coroutine_fn wait_serialising_requests(BdrvTrackedRequest *self)
}
}
}
+ qemu_co_mutex_unlock(&bs->reqs_lock);
} while (retry);
return waited;
@@ -2291,14 +2297,17 @@ int coroutine_fn bdrv_co_flush(BlockDriverState *bs)
goto early_exit;
}
+ qemu_co_mutex_lock(&bs->reqs_lock);
current_gen = atomic_read(&bs->write_gen);
/* Wait until any previous flushes are completed */
while (bs->active_flush_req) {
- qemu_co_queue_wait(&bs->flush_queue, NULL);
+ qemu_co_queue_wait(&bs->flush_queue, &bs->reqs_lock);
}
+ /* Flushes reach this point in nondecreasing current_gen order. */
bs->active_flush_req = true;
+ qemu_co_mutex_unlock(&bs->reqs_lock);
/* Write back all layers by calling one driver function */
if (bs->drv->bdrv_co_flush) {
@@ -2370,9 +2379,12 @@ out:
if (ret == 0) {
bs->flushed_gen = current_gen;
}
+
+ qemu_co_mutex_lock(&bs->reqs_lock);
bs->active_flush_req = false;
/* Return value is ignored - it's ok if wait queue is empty */
qemu_co_queue_next(&bs->flush_queue);
+ qemu_co_mutex_unlock(&bs->reqs_lock);
early_exit:
bdrv_dec_in_flight(bs);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 8a9bc0bebc..31fb3640f1 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -609,11 +609,6 @@ struct BlockDriverState {
uint64_t write_threshold_offset;
NotifierWithReturn write_threshold_notifier;
- QLIST_HEAD(, BdrvTrackedRequest) tracked_requests;
- CoQueue flush_queue; /* Serializing flush queue */
- bool active_flush_req; /* Flush request in flight? */
- unsigned int flushed_gen; /* Flushed write generation */
-
QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps;
/* Offset after the highest byte written to */
@@ -647,6 +642,15 @@ struct BlockDriverState {
/* Accessed with atomic ops. */
int quiesce_counter;
unsigned int write_gen; /* Current data generation */
+
+ /* Protected by reqs_lock. */
+ CoMutex reqs_lock;
+ QLIST_HEAD(, BdrvTrackedRequest) tracked_requests;
+ CoQueue flush_queue; /* Serializing flush queue */
+ bool active_flush_req; /* Flush request in flight? */
+
+ /* Only read/written by whoever has set active_flush_req to true. */
+ unsigned int flushed_gen; /* Flushed write generation */
};
struct BlockBackendRootState {
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 14/19] block: introduce dirty_bitmap_mutex
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (12 preceding siblings ...)
2017-06-05 12:39 ` [Qemu-devel] [PATCH 13/19] block: protect tracked_requests and flush_queue with reqs_lock Paolo Bonzini
@ 2017-06-05 12:39 ` Paolo Bonzini
2017-06-05 12:39 ` [Qemu-devel] [PATCH 15/19] migration/block: reset dirty bitmap before reading Paolo Bonzini
` (6 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:39 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
It protects only the list of dirty bitmaps; in the next patch we will
also protect their content.
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block/dirty-bitmap.c | 44 +++++++++++++++++++++++++++++++++++++++++++-
block/mirror.c | 3 ++-
blockdev.c | 44 +++++++-------------------------------------
include/block/block_int.h | 5 +++++
migration/block.c | 6 ------
5 files changed, 57 insertions(+), 45 deletions(-)
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 519737c8d3..fa78109365 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -52,6 +52,17 @@ struct BdrvDirtyBitmapIter {
BdrvDirtyBitmap *bitmap;
};
+static inline void bdrv_dirty_bitmaps_lock(BlockDriverState *bs)
+{
+ qemu_mutex_lock(&bs->dirty_bitmap_mutex);
+}
+
+static inline void bdrv_dirty_bitmaps_unlock(BlockDriverState *bs)
+{
+ qemu_mutex_unlock(&bs->dirty_bitmap_mutex);
+}
+
+/* Called with BQL or dirty_bitmap lock taken. */
BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs, const char *name)
{
BdrvDirtyBitmap *bm;
@@ -65,6 +76,7 @@ BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs, const char *name)
return NULL;
}
+/* Called with BQL taken. */
void bdrv_dirty_bitmap_make_anon(BdrvDirtyBitmap *bitmap)
{
assert(!bdrv_dirty_bitmap_frozen(bitmap));
@@ -72,6 +84,7 @@ void bdrv_dirty_bitmap_make_anon(BdrvDirtyBitmap *bitmap)
bitmap->name = NULL;
}
+/* Called with BQL taken. */
BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs,
uint32_t granularity,
const char *name,
@@ -100,7 +113,9 @@ BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs,
bitmap->size = bitmap_size;
bitmap->name = g_strdup(name);
bitmap->disabled = false;
+ bdrv_dirty_bitmaps_lock(bs);
QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list);
+ bdrv_dirty_bitmaps_unlock(bs);
return bitmap;
}
@@ -164,16 +179,19 @@ const char *bdrv_dirty_bitmap_name(const BdrvDirtyBitmap *bitmap)
return bitmap->name;
}
+/* Called with BQL taken. */
bool bdrv_dirty_bitmap_frozen(BdrvDirtyBitmap *bitmap)
{
return bitmap->successor;
}
+/* Called with BQL taken. */
bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap)
{
return !(bitmap->disabled || bitmap->successor);
}
+/* Called with BQL taken. */
DirtyBitmapStatus bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap)
{
if (bdrv_dirty_bitmap_frozen(bitmap)) {
@@ -188,6 +206,7 @@ DirtyBitmapStatus bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap)
/**
* Create a successor bitmap destined to replace this bitmap after an operation.
* Requires that the bitmap is not frozen and has no successor.
+ * Called with BQL taken.
*/
int bdrv_dirty_bitmap_create_successor(BlockDriverState *bs,
BdrvDirtyBitmap *bitmap, Error **errp)
@@ -220,6 +239,7 @@ int bdrv_dirty_bitmap_create_successor(BlockDriverState *bs,
/**
* For a bitmap with a successor, yield our name to the successor,
* delete the old bitmap, and return a handle to the new bitmap.
+ * Called with BQL taken.
*/
BdrvDirtyBitmap *bdrv_dirty_bitmap_abdicate(BlockDriverState *bs,
BdrvDirtyBitmap *bitmap,
@@ -247,6 +267,7 @@ BdrvDirtyBitmap *bdrv_dirty_bitmap_abdicate(BlockDriverState *bs,
* In cases of failure where we can no longer safely delete the parent,
* we may wish to re-join the parent and child/successor.
* The merged parent will be un-frozen, but not explicitly re-enabled.
+ * Called with BQL taken.
*/
BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs,
BdrvDirtyBitmap *parent,
@@ -271,25 +292,30 @@ BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs,
/**
* Truncates _all_ bitmaps attached to a BDS.
+ * Called with BQL taken.
*/
void bdrv_dirty_bitmap_truncate(BlockDriverState *bs)
{
BdrvDirtyBitmap *bitmap;
uint64_t size = bdrv_nb_sectors(bs);
+ bdrv_dirty_bitmaps_lock(bs);
QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) {
assert(!bdrv_dirty_bitmap_frozen(bitmap));
assert(!bitmap->active_iterators);
hbitmap_truncate(bitmap->bitmap, size);
bitmap->size = size;
}
+ bdrv_dirty_bitmaps_unlock(bs);
}
+/* Called with BQL taken. */
static void bdrv_do_release_matching_dirty_bitmap(BlockDriverState *bs,
BdrvDirtyBitmap *bitmap,
bool only_named)
{
BdrvDirtyBitmap *bm, *next;
+ bdrv_dirty_bitmaps_lock(bs);
QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) {
if ((!bitmap || bm == bitmap) && (!only_named || bm->name)) {
assert(!bm->active_iterators);
@@ -301,15 +327,19 @@ static void bdrv_do_release_matching_dirty_bitmap(BlockDriverState *bs,
g_free(bm);
if (bitmap) {
- return;
+ goto out;
}
}
}
if (bitmap) {
abort();
}
+
+out:
+ bdrv_dirty_bitmaps_unlock(bs);
}
+/* Called with BQL taken. */
void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
{
bdrv_do_release_matching_dirty_bitmap(bs, bitmap, false);
@@ -318,18 +348,21 @@ void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
/**
* Release all named dirty bitmaps attached to a BDS (for use in bdrv_close()).
* There must not be any frozen bitmaps attached.
+ * Called with BQL taken.
*/
void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs)
{
bdrv_do_release_matching_dirty_bitmap(bs, NULL, true);
}
+/* Called with BQL taken. */
void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap)
{
assert(!bdrv_dirty_bitmap_frozen(bitmap));
bitmap->disabled = true;
}
+/* Called with BQL taken. */
void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap)
{
assert(!bdrv_dirty_bitmap_frozen(bitmap));
@@ -342,6 +375,7 @@ BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs)
BlockDirtyInfoList *list = NULL;
BlockDirtyInfoList **plist = &list;
+ bdrv_dirty_bitmaps_lock(bs);
QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) {
BlockDirtyInfo *info = g_new0(BlockDirtyInfo, 1);
BlockDirtyInfoList *entry = g_new0(BlockDirtyInfoList, 1);
@@ -354,6 +388,7 @@ BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs)
*plist = entry;
plist = &entry->next;
}
+ bdrv_dirty_bitmaps_unlock(bs);
return list;
}
@@ -508,12 +543,19 @@ void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector,
int64_t nr_sectors)
{
BdrvDirtyBitmap *bitmap;
+
+ if (QLIST_EMPTY(&bs->dirty_bitmaps)) {
+ return;
+ }
+
+ bdrv_dirty_bitmaps_lock(bs);
QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) {
if (!bdrv_dirty_bitmap_enabled(bitmap)) {
continue;
}
hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors);
}
+ bdrv_dirty_bitmaps_unlock(bs);
}
/**
diff --git a/block/mirror.c b/block/mirror.c
index a2a970301c..88ae882c46 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -506,6 +506,8 @@ static void mirror_exit(BlockJob *job, void *opaque)
BlockDriverState *mirror_top_bs = s->mirror_top_bs;
Error *local_err = NULL;
+ bdrv_release_dirty_bitmap(src, s->dirty_bitmap);
+
/* Make sure that the source BDS doesn't go away before we called
* block_job_completed(). */
bdrv_ref(src);
@@ -904,7 +906,6 @@ immediate_exit:
g_free(s->cow_bitmap);
g_free(s->in_flight_bitmap);
bdrv_dirty_iter_free(s->dbi);
- bdrv_release_dirty_bitmap(bs, s->dirty_bitmap);
data = g_malloc(sizeof(*data));
data->ret = ret;
diff --git a/blockdev.c b/blockdev.c
index 335fbccf5c..6e7c8a678c 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1362,12 +1362,10 @@ out_aio_context:
static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
const char *name,
BlockDriverState **pbs,
- AioContext **paio,
Error **errp)
{
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
- AioContext *aio_context;
if (!node) {
error_setg(errp, "Node cannot be NULL");
@@ -1383,29 +1381,17 @@ static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
return NULL;
}
- aio_context = bdrv_get_aio_context(bs);
- aio_context_acquire(aio_context);
-
bitmap = bdrv_find_dirty_bitmap(bs, name);
if (!bitmap) {
error_setg(errp, "Dirty bitmap '%s' not found", name);
- goto fail;
+ return NULL;
}
if (pbs) {
*pbs = bs;
}
- if (paio) {
- *paio = aio_context;
- } else {
- aio_context_release(aio_context);
- }
return bitmap;
-
- fail:
- aio_context_release(aio_context);
- return NULL;
}
/* New and old BlockDriverState structs for atomic group operations */
@@ -2021,7 +2007,6 @@ static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
state->bitmap = block_dirty_bitmap_lookup(action->node,
action->name,
&state->bs,
- &state->aio_context,
errp);
if (!state->bitmap) {
return;
@@ -2729,7 +2714,6 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name,
bool has_granularity, uint32_t granularity,
Error **errp)
{
- AioContext *aio_context;
BlockDriverState *bs;
if (!name || name[0] == '\0') {
@@ -2742,14 +2726,11 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name,
return;
}
- aio_context = bdrv_get_aio_context(bs);
- aio_context_acquire(aio_context);
-
if (has_granularity) {
if (granularity < 512 || !is_power_of_2(granularity)) {
error_setg(errp, "Granularity must be power of 2 "
"and at least 512");
- goto out;
+ return;
}
} else {
/* Default to cluster size, if available: */
@@ -2757,19 +2738,15 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name,
}
bdrv_create_dirty_bitmap(bs, granularity, name, errp);
-
- out:
- aio_context_release(aio_context);
}
void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
Error **errp)
{
- AioContext *aio_context;
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
- bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
+ bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
if (!bitmap || !bs) {
return;
}
@@ -2778,13 +2755,10 @@ void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
error_setg(errp,
"Bitmap '%s' is currently frozen and cannot be removed",
name);
- goto out;
+ return;
}
bdrv_dirty_bitmap_make_anon(bitmap);
bdrv_release_dirty_bitmap(bs, bitmap);
-
- out:
- aio_context_release(aio_context);
}
/**
@@ -2794,11 +2768,10 @@ void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
Error **errp)
{
- AioContext *aio_context;
BdrvDirtyBitmap *bitmap;
BlockDriverState *bs;
- bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
+ bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
if (!bitmap || !bs) {
return;
}
@@ -2807,18 +2780,15 @@ void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
error_setg(errp,
"Bitmap '%s' is currently frozen and cannot be modified",
name);
- goto out;
+ return;
} else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
error_setg(errp,
"Bitmap '%s' is currently disabled and cannot be cleared",
name);
- goto out;
+ return;
}
bdrv_clear_dirty_bitmap(bitmap, NULL);
-
- out:
- aio_context_release(aio_context);
}
void hmp_drive_del(Monitor *mon, const QDict *qdict)
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 31fb3640f1..c834b866a7 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -609,6 +609,11 @@ struct BlockDriverState {
uint64_t write_threshold_offset;
NotifierWithReturn write_threshold_notifier;
+ /* Writing to the list requires the BQL _and_ the dirty_bitmap_mutex.
+ * Reading from the list can be done with either the BQL or the
+ * dirty_bitmap_mutex. Modifying a bitmap requires the AioContext
+ * lock. */
+ QemuMutex dirty_bitmap_mutex;
QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps;
/* Offset after the highest byte written to */
diff --git a/migration/block.c b/migration/block.c
index 13f90d3f17..9e9f0316be 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -345,10 +345,8 @@ static int set_dirty_tracking(void)
int ret;
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
- aio_context_acquire(blk_get_aio_context(bmds->blk));
bmds->dirty_bitmap = bdrv_create_dirty_bitmap(blk_bs(bmds->blk),
BLOCK_SIZE, NULL, NULL);
- aio_context_release(blk_get_aio_context(bmds->blk));
if (!bmds->dirty_bitmap) {
ret = -errno;
goto fail;
@@ -359,9 +357,7 @@ static int set_dirty_tracking(void)
fail:
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
if (bmds->dirty_bitmap) {
- aio_context_acquire(blk_get_aio_context(bmds->blk));
bdrv_release_dirty_bitmap(blk_bs(bmds->blk), bmds->dirty_bitmap);
- aio_context_release(blk_get_aio_context(bmds->blk));
}
}
return ret;
@@ -374,9 +370,7 @@ static void unset_dirty_tracking(void)
BlkMigDevState *bmds;
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
- aio_context_acquire(blk_get_aio_context(bmds->blk));
bdrv_release_dirty_bitmap(blk_bs(bmds->blk), bmds->dirty_bitmap);
- aio_context_release(blk_get_aio_context(bmds->blk));
}
}
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 15/19] migration/block: reset dirty bitmap before reading
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (13 preceding siblings ...)
2017-06-05 12:39 ` [Qemu-devel] [PATCH 14/19] block: introduce dirty_bitmap_mutex Paolo Bonzini
@ 2017-06-05 12:39 ` Paolo Bonzini
2017-06-05 12:39 ` [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex Paolo Bonzini
` (5 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:39 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
Any data that is returned by read may be stale already, the bitmap
has to be cleared before issuing the read.
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
migration/block.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/migration/block.c b/migration/block.c
index 9e9f0316be..8fe484e8b4 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -536,6 +536,8 @@ static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds,
} else {
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK;
}
+ bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, sector, nr_sectors);
+
blk = g_new(BlkMigBlock, 1);
blk->buf = g_malloc(BLOCK_SIZE);
blk->bmds = bmds;
@@ -568,7 +570,6 @@ static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds,
g_free(blk);
}
- bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, sector, nr_sectors);
sector += nr_sectors;
bmds->cur_dirty = sector;
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (14 preceding siblings ...)
2017-06-05 12:39 ` [Qemu-devel] [PATCH 15/19] migration/block: reset dirty bitmap before reading Paolo Bonzini
@ 2017-06-05 12:39 ` Paolo Bonzini
2017-06-26 16:07 ` Vladimir Sementsov-Ogievskiy
2017-06-05 12:39 ` [Qemu-devel] [PATCH 17/19] block: introduce block_account_one_io Paolo Bonzini
` (4 subsequent siblings)
20 siblings, 1 reply; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:39 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block/dirty-bitmap.c | 68 ++++++++++++++++++++++++++++++++++++++------
block/mirror.c | 11 +++++--
include/block/block_int.h | 4 +--
include/block/dirty-bitmap.h | 25 +++++++++++-----
migration/block.c | 10 ++++---
5 files changed, 94 insertions(+), 24 deletions(-)
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index fa78109365..a04c6e4154 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -37,6 +37,7 @@
* or enabled. A frozen bitmap can only abdicate() or reclaim().
*/
struct BdrvDirtyBitmap {
+ QemuMutex *mutex;
HBitmap *bitmap; /* Dirty sector bitmap implementation */
HBitmap *meta; /* Meta dirty bitmap */
BdrvDirtyBitmap *successor; /* Anonymous child; implies frozen status */
@@ -62,6 +63,16 @@ static inline void bdrv_dirty_bitmaps_unlock(BlockDriverState *bs)
qemu_mutex_unlock(&bs->dirty_bitmap_mutex);
}
+void bdrv_dirty_bitmap_lock(BdrvDirtyBitmap *bitmap)
+{
+ qemu_mutex_lock(bitmap->mutex);
+}
+
+void bdrv_dirty_bitmap_unlock(BdrvDirtyBitmap *bitmap)
+{
+ qemu_mutex_unlock(bitmap->mutex);
+}
+
/* Called with BQL or dirty_bitmap lock taken. */
BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs, const char *name)
{
@@ -109,6 +120,7 @@ BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs,
return NULL;
}
bitmap = g_new0(BdrvDirtyBitmap, 1);
+ bitmap->mutex = &bs->dirty_bitmap_mutex;
bitmap->bitmap = hbitmap_alloc(bitmap_size, ctz32(sector_granularity));
bitmap->size = bitmap_size;
bitmap->name = g_strdup(name);
@@ -134,20 +146,24 @@ void bdrv_create_meta_dirty_bitmap(BdrvDirtyBitmap *bitmap,
int chunk_size)
{
assert(!bitmap->meta);
+ qemu_mutex_lock(bitmap->mutex);
bitmap->meta = hbitmap_create_meta(bitmap->bitmap,
chunk_size * BITS_PER_BYTE);
+ qemu_mutex_unlock(bitmap->mutex);
}
void bdrv_release_meta_dirty_bitmap(BdrvDirtyBitmap *bitmap)
{
assert(bitmap->meta);
+ qemu_mutex_lock(bitmap->mutex);
hbitmap_free_meta(bitmap->bitmap);
bitmap->meta = NULL;
+ qemu_mutex_unlock(bitmap->mutex);
}
-int bdrv_dirty_bitmap_get_meta(BlockDriverState *bs,
- BdrvDirtyBitmap *bitmap, int64_t sector,
- int nb_sectors)
+int bdrv_dirty_bitmap_get_meta_locked(BlockDriverState *bs,
+ BdrvDirtyBitmap *bitmap, int64_t sector,
+ int nb_sectors)
{
uint64_t i;
int sectors_per_bit = 1 << hbitmap_granularity(bitmap->meta);
@@ -162,11 +178,26 @@ int bdrv_dirty_bitmap_get_meta(BlockDriverState *bs,
return false;
}
+int bdrv_dirty_bitmap_get_meta(BlockDriverState *bs,
+ BdrvDirtyBitmap *bitmap, int64_t sector,
+ int nb_sectors)
+{
+ bool dirty;
+
+ qemu_mutex_lock(bitmap->mutex);
+ dirty = bdrv_dirty_bitmap_get_meta_locked(bs, bitmap, sector, nb_sectors);
+ qemu_mutex_unlock(bitmap->mutex);
+
+ return dirty;
+}
+
void bdrv_dirty_bitmap_reset_meta(BlockDriverState *bs,
BdrvDirtyBitmap *bitmap, int64_t sector,
int nb_sectors)
{
+ qemu_mutex_lock(bitmap->mutex);
hbitmap_reset(bitmap->meta, sector, nb_sectors);
+ qemu_mutex_unlock(bitmap->mutex);
}
int64_t bdrv_dirty_bitmap_size(const BdrvDirtyBitmap *bitmap)
@@ -393,8 +424,9 @@ BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs)
return list;
}
-int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
- int64_t sector)
+/* Called within bdrv_dirty_bitmap_lock..unlock */
+int bdrv_get_dirty_locked(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
+ int64_t sector)
{
if (bitmap) {
return hbitmap_get(bitmap->bitmap, sector);
@@ -467,23 +499,42 @@ int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter)
return hbitmap_iter_next(&iter->hbi);
}
+/* Called within bdrv_dirty_bitmap_lock..unlock */
+void bdrv_set_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
+ int64_t cur_sector, int64_t nr_sectors)
+{
+ assert(bdrv_dirty_bitmap_enabled(bitmap));
+ hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors);
+}
+
void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors)
{
+ bdrv_dirty_bitmap_lock(bitmap);
+ bdrv_set_dirty_bitmap_locked(bitmap, cur_sector, nr_sectors);
+ bdrv_dirty_bitmap_unlock(bitmap);
+}
+
+/* Called within bdrv_dirty_bitmap_lock..unlock */
+void bdrv_reset_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
+ int64_t cur_sector, int64_t nr_sectors)
+{
assert(bdrv_dirty_bitmap_enabled(bitmap));
- hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors);
+ hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors);
}
void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors)
{
- assert(bdrv_dirty_bitmap_enabled(bitmap));
- hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors);
+ bdrv_dirty_bitmap_lock(bitmap);
+ bdrv_reset_dirty_bitmap_locked(bitmap, cur_sector, nr_sectors);
+ bdrv_dirty_bitmap_unlock(bitmap);
}
void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out)
{
assert(bdrv_dirty_bitmap_enabled(bitmap));
+ bdrv_dirty_bitmap_lock(bitmap);
if (!out) {
hbitmap_reset_all(bitmap->bitmap);
} else {
@@ -492,6 +543,7 @@ void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out)
hbitmap_granularity(backup));
*out = backup;
}
+ bdrv_dirty_bitmap_unlock(bitmap);
}
void bdrv_undo_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *in)
diff --git a/block/mirror.c b/block/mirror.c
index 88ae882c46..19afcc6f1a 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -342,6 +342,7 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
int max_io_sectors = MAX((s->buf_size >> BDRV_SECTOR_BITS) / MAX_IN_FLIGHT,
MAX_IO_SECTORS);
+ bdrv_dirty_bitmap_lock(s->dirty_bitmap);
sector_num = bdrv_dirty_iter_next(s->dbi);
if (sector_num < 0) {
bdrv_set_dirty_iter(s->dbi, 0);
@@ -349,6 +350,7 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
trace_mirror_restart_iter(s, bdrv_get_dirty_count(s->dirty_bitmap));
assert(sector_num >= 0);
}
+ bdrv_dirty_bitmap_unlock(s->dirty_bitmap);
first_chunk = sector_num / sectors_per_chunk;
while (test_bit(first_chunk, s->in_flight_bitmap)) {
@@ -360,12 +362,13 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
/* Find the number of consective dirty chunks following the first dirty
* one, and wait for in flight requests in them. */
+ bdrv_dirty_bitmap_lock(s->dirty_bitmap);
while (nb_chunks * sectors_per_chunk < (s->buf_size >> BDRV_SECTOR_BITS)) {
int64_t next_dirty;
int64_t next_sector = sector_num + nb_chunks * sectors_per_chunk;
int64_t next_chunk = next_sector / sectors_per_chunk;
if (next_sector >= end ||
- !bdrv_get_dirty(source, s->dirty_bitmap, next_sector)) {
+ !bdrv_get_dirty_locked(source, s->dirty_bitmap, next_sector)) {
break;
}
if (test_bit(next_chunk, s->in_flight_bitmap)) {
@@ -386,8 +389,10 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
* calling bdrv_get_block_status_above could yield - if some blocks are
* marked dirty in this window, we need to know.
*/
- bdrv_reset_dirty_bitmap(s->dirty_bitmap, sector_num,
- nb_chunks * sectors_per_chunk);
+ bdrv_reset_dirty_bitmap_locked(s->dirty_bitmap, sector_num,
+ nb_chunks * sectors_per_chunk);
+ bdrv_dirty_bitmap_unlock(s->dirty_bitmap);
+
bitmap_set(s->in_flight_bitmap, sector_num / sectors_per_chunk, nb_chunks);
while (nb_chunks > 0 && sector_num < end) {
int64_t ret;
diff --git a/include/block/block_int.h b/include/block/block_int.h
index c834b866a7..15c656d1df 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -611,8 +611,8 @@ struct BlockDriverState {
/* Writing to the list requires the BQL _and_ the dirty_bitmap_mutex.
* Reading from the list can be done with either the BQL or the
- * dirty_bitmap_mutex. Modifying a bitmap requires the AioContext
- * lock. */
+ * dirty_bitmap_mutex. Modifying a bitmap only requires
+ * dirty_bitmap_mutex. */
QemuMutex dirty_bitmap_mutex;
QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps;
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index 9dea14ba03..ad6558af56 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -36,8 +36,6 @@ bool bdrv_dirty_bitmap_frozen(BdrvDirtyBitmap *bitmap);
const char *bdrv_dirty_bitmap_name(const BdrvDirtyBitmap *bitmap);
int64_t bdrv_dirty_bitmap_size(const BdrvDirtyBitmap *bitmap);
DirtyBitmapStatus bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap);
-int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
- int64_t sector);
void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors);
void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap,
@@ -45,6 +43,9 @@ void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap,
int bdrv_dirty_bitmap_get_meta(BlockDriverState *bs,
BdrvDirtyBitmap *bitmap, int64_t sector,
int nb_sectors);
+int bdrv_dirty_bitmap_get_meta_locked(BlockDriverState *bs,
+ BdrvDirtyBitmap *bitmap, int64_t sector,
+ int nb_sectors);
void bdrv_dirty_bitmap_reset_meta(BlockDriverState *bs,
BdrvDirtyBitmap *bitmap, int64_t sector,
int nb_sectors);
@@ -52,11 +53,6 @@ BdrvDirtyBitmapIter *bdrv_dirty_meta_iter_new(BdrvDirtyBitmap *bitmap);
BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap,
uint64_t first_sector);
void bdrv_dirty_iter_free(BdrvDirtyBitmapIter *iter);
-int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter);
-void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *hbi, int64_t sector_num);
-int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap);
-int64_t bdrv_get_meta_dirty_count(BdrvDirtyBitmap *bitmap);
-void bdrv_dirty_bitmap_truncate(BlockDriverState *bs);
uint64_t bdrv_dirty_bitmap_serialization_size(const BdrvDirtyBitmap *bitmap,
uint64_t start, uint64_t count);
@@ -72,4 +68,19 @@ void bdrv_dirty_bitmap_deserialize_zeroes(BdrvDirtyBitmap *bitmap,
bool finish);
void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap *bitmap);
+/* Functions that require manual locking. */
+void bdrv_dirty_bitmap_lock(BdrvDirtyBitmap *bitmap);
+void bdrv_dirty_bitmap_unlock(BdrvDirtyBitmap *bitmap);
+int bdrv_get_dirty_locked(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
+ int64_t sector);
+void bdrv_set_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
+ int64_t cur_sector, int64_t nr_sectors);
+void bdrv_reset_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
+ int64_t cur_sector, int64_t nr_sectors);
+int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter);
+void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *hbi, int64_t sector_num);
+int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap);
+int64_t bdrv_get_meta_dirty_count(BdrvDirtyBitmap *bitmap);
+void bdrv_dirty_bitmap_truncate(BlockDriverState *bs);
+
#endif
diff --git a/migration/block.c b/migration/block.c
index 8fe484e8b4..d102c840f6 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -529,14 +529,15 @@ static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds,
} else {
blk_mig_unlock();
}
- if (bdrv_get_dirty(bs, bmds->dirty_bitmap, sector)) {
-
+ bdrv_dirty_bitmap_lock(bmds->dirty_bitmap);
+ if (bdrv_get_dirty_locked(bs, bmds->dirty_bitmap, sector)) {
if (total_sectors - sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
nr_sectors = total_sectors - sector;
} else {
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK;
}
- bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, sector, nr_sectors);
+ bdrv_reset_dirty_bitmap_locked(bmds->dirty_bitmap, sector, nr_sectors);
+ bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap);
blk = g_new(BlkMigBlock, 1);
blk->buf = g_malloc(BLOCK_SIZE);
@@ -572,9 +573,10 @@ static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds,
sector += nr_sectors;
bmds->cur_dirty = sector;
-
break;
}
+
+ bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap);
sector += BDRV_SECTORS_PER_DIRTY_CHUNK;
bmds->cur_dirty = sector;
}
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 17/19] block: introduce block_account_one_io
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (15 preceding siblings ...)
2017-06-05 12:39 ` [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex Paolo Bonzini
@ 2017-06-05 12:39 ` Paolo Bonzini
2017-06-05 12:39 ` [Qemu-devel] [PATCH 18/19] block: split BlockAcctStats creation and setup Paolo Bonzini
` (3 subsequent siblings)
20 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:39 UTC (permalink / raw)
To: qemu-devel; +Cc: famz
This is the common code to account operations that produced actual I/O.
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block/accounting.c | 51 ++++++++++++++++++++++-----------------------------
1 file changed, 22 insertions(+), 29 deletions(-)
diff --git a/block/accounting.c b/block/accounting.c
index 3f457c4e73..a279e0b124 100644
--- a/block/accounting.c
+++ b/block/accounting.c
@@ -86,7 +86,8 @@ void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie,
cookie->type = type;
}
-void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie)
+static void block_account_one_io(BlockAcctStats *stats, BlockAcctCookie *cookie,
+ bool failed)
{
BlockAcctTimedStats *s;
int64_t time_ns = qemu_clock_get_ns(clock_type);
@@ -98,31 +99,14 @@ void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie)
assert(cookie->type < BLOCK_MAX_IOTYPE);
- stats->nr_bytes[cookie->type] += cookie->bytes;
- stats->nr_ops[cookie->type]++;
- stats->total_time_ns[cookie->type] += latency_ns;
- stats->last_access_time_ns = time_ns;
-
- QSLIST_FOREACH(s, &stats->intervals, entries) {
- timed_average_account(&s->latency[cookie->type], latency_ns);
+ if (failed) {
+ stats->failed_ops[cookie->type]++;
+ } else {
+ stats->nr_bytes[cookie->type] += cookie->bytes;
+ stats->nr_ops[cookie->type]++;
}
-}
-
-void block_acct_failed(BlockAcctStats *stats, BlockAcctCookie *cookie)
-{
- assert(cookie->type < BLOCK_MAX_IOTYPE);
-
- stats->failed_ops[cookie->type]++;
-
- if (stats->account_failed) {
- BlockAcctTimedStats *s;
- int64_t time_ns = qemu_clock_get_ns(clock_type);
- int64_t latency_ns = time_ns - cookie->start_time_ns;
-
- if (qtest_enabled()) {
- latency_ns = qtest_latency_ns;
- }
+ if (!failed || stats->account_failed) {
stats->total_time_ns[cookie->type] += latency_ns;
stats->last_access_time_ns = time_ns;
@@ -132,15 +116,24 @@ void block_acct_failed(BlockAcctStats *stats, BlockAcctCookie *cookie)
}
}
+void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie)
+{
+ block_account_one_io(stats, cookie, false);
+}
+
+void block_acct_failed(BlockAcctStats *stats, BlockAcctCookie *cookie)
+{
+ block_account_one_io(stats, cookie, true);
+}
+
void block_acct_invalid(BlockAcctStats *stats, enum BlockAcctType type)
{
assert(type < BLOCK_MAX_IOTYPE);
- /* block_acct_done() and block_acct_failed() update
- * total_time_ns[], but this one does not. The reason is that
- * invalid requests are accounted during their submission,
- * therefore there's no actual I/O involved. */
-
+ /* block_account_one_io() updates total_time_ns[], but this one does
+ * not. The reason is that invalid requests are accounted during their
+ * submission, therefore there's no actual I/O involved.
+ */
stats->invalid_ops[type]++;
if (stats->account_invalid) {
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 18/19] block: split BlockAcctStats creation and setup
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (16 preceding siblings ...)
2017-06-05 12:39 ` [Qemu-devel] [PATCH 17/19] block: introduce block_account_one_io Paolo Bonzini
@ 2017-06-05 12:39 ` Paolo Bonzini
2017-06-06 15:43 ` Alberto Garcia
2017-06-05 12:39 ` [Qemu-devel] [PATCH 19/19] block: make accounting thread-safe Paolo Bonzini
` (2 subsequent siblings)
20 siblings, 1 reply; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:39 UTC (permalink / raw)
To: qemu-devel; +Cc: famz, Alberto Garcia
block_acct_destroy is called unconditionally in blk_delete, but there is
no BlockAcctStats function that is called unconditionally in blk_new.
Split block_acct_init in two, so that it will be possible to create a
QemuMutex in block_acct_init and destroy it in block_acct_cleanup.
Cc: Alberto Garcia <berto@igalia.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block/accounting.c | 13 ++++++++-----
block/block-backend.c | 1 +
blockdev.c | 2 +-
include/block/accounting.h | 3 ++-
4 files changed, 12 insertions(+), 7 deletions(-)
diff --git a/block/accounting.c b/block/accounting.c
index a279e0b124..ce6dbf7760 100644
--- a/block/accounting.c
+++ b/block/accounting.c
@@ -32,17 +32,20 @@
static QEMUClockType clock_type = QEMU_CLOCK_REALTIME;
static const int qtest_latency_ns = NANOSECONDS_PER_SECOND / 1000;
-void block_acct_init(BlockAcctStats *stats, bool account_invalid,
- bool account_failed)
+void block_acct_init(BlockAcctStats *stats)
{
- stats->account_invalid = account_invalid;
- stats->account_failed = account_failed;
-
if (qtest_enabled()) {
clock_type = QEMU_CLOCK_VIRTUAL;
}
}
+void block_acct_setup(BlockAcctStats *stats, bool account_invalid,
+ bool account_failed)
+{
+ stats->account_invalid = account_invalid;
+ stats->account_failed = account_failed;
+}
+
void block_acct_cleanup(BlockAcctStats *stats)
{
BlockAcctTimedStats *s, *next;
diff --git a/block/block-backend.c b/block/block-backend.c
index be2ddf173a..828497e27a 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -219,6 +219,7 @@ BlockBackend *blk_new(uint64_t perm, uint64_t shared_perm)
qemu_co_mutex_init(&blk->public.throttled_reqs_lock);
qemu_co_queue_init(&blk->public.throttled_reqs[0]);
qemu_co_queue_init(&blk->public.throttled_reqs[1]);
+ block_acct_init(&blk->stats);
notifier_list_init(&blk->remove_bs_notifiers);
notifier_list_init(&blk->insert_bs_notifiers);
diff --git a/blockdev.c b/blockdev.c
index 6e7c8a678c..0fa2e7e571 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -595,7 +595,7 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
autostart = 0;
}
- block_acct_init(blk_get_stats(blk), account_invalid, account_failed);
+ block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
blk_unref(blk);
diff --git a/include/block/accounting.h b/include/block/accounting.h
index 20891639d5..55cb06fdb6 100644
--- a/include/block/accounting.h
+++ b/include/block/accounting.h
@@ -61,7 +61,8 @@ typedef struct BlockAcctCookie {
enum BlockAcctType type;
} BlockAcctCookie;
-void block_acct_init(BlockAcctStats *stats, bool account_invalid,
+void block_acct_init(BlockAcctStats *stats);
+void block_acct_setup(BlockAcctStats *stats, bool account_invalid,
bool account_failed);
void block_acct_cleanup(BlockAcctStats *stats);
void block_acct_add_interval(BlockAcctStats *stats, unsigned interval_length);
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* [Qemu-devel] [PATCH 19/19] block: make accounting thread-safe
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (17 preceding siblings ...)
2017-06-05 12:39 ` [Qemu-devel] [PATCH 18/19] block: split BlockAcctStats creation and setup Paolo Bonzini
@ 2017-06-05 12:39 ` Paolo Bonzini
2017-06-06 15:45 ` Alberto Garcia
2018-05-24 13:35 ` Alberto Garcia
2017-06-05 13:18 ` [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 no-reply
2017-06-07 0:04 ` Fam Zheng
20 siblings, 2 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-05 12:39 UTC (permalink / raw)
To: qemu-devel; +Cc: famz, Alberto Garcia
I'm not trying too hard yet. Later, with multiqueue support,
this may cause mutex contention or cacheline bouncing.
Cc: Alberto Garcia <berto@igalia.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block/accounting.c | 16 ++++++++++++++++
include/block/accounting.h | 8 ++++++--
2 files changed, 22 insertions(+), 2 deletions(-)
diff --git a/block/accounting.c b/block/accounting.c
index ce6dbf7760..87ef5bbfaa 100644
--- a/block/accounting.c
+++ b/block/accounting.c
@@ -34,6 +34,7 @@ static const int qtest_latency_ns = NANOSECONDS_PER_SECOND / 1000;
void block_acct_init(BlockAcctStats *stats)
{
+ qemu_mutex_init(&stats->lock);
if (qtest_enabled()) {
clock_type = QEMU_CLOCK_VIRTUAL;
}
@@ -52,6 +53,7 @@ void block_acct_cleanup(BlockAcctStats *stats)
QSLIST_FOREACH_SAFE(s, &stats->intervals, entries, next) {
g_free(s);
}
+ qemu_mutex_destroy(&stats->lock);
}
void block_acct_add_interval(BlockAcctStats *stats, unsigned interval_length)
@@ -61,12 +63,15 @@ void block_acct_add_interval(BlockAcctStats *stats, unsigned interval_length)
s = g_new0(BlockAcctTimedStats, 1);
s->interval_length = interval_length;
+ s->stats = stats;
+ qemu_mutex_lock(&stats->lock);
QSLIST_INSERT_HEAD(&stats->intervals, s, entries);
for (i = 0; i < BLOCK_MAX_IOTYPE; i++) {
timed_average_init(&s->latency[i], clock_type,
(uint64_t) interval_length * NANOSECONDS_PER_SECOND);
}
+ qemu_mutex_unlock(&stats->lock);
}
BlockAcctTimedStats *block_acct_interval_next(BlockAcctStats *stats,
@@ -102,6 +107,8 @@ static void block_account_one_io(BlockAcctStats *stats, BlockAcctCookie *cookie,
assert(cookie->type < BLOCK_MAX_IOTYPE);
+ qemu_mutex_lock(&stats->lock);
+
if (failed) {
stats->failed_ops[cookie->type]++;
} else {
@@ -117,6 +124,8 @@ static void block_account_one_io(BlockAcctStats *stats, BlockAcctCookie *cookie,
timed_average_account(&s->latency[cookie->type], latency_ns);
}
}
+
+ qemu_mutex_unlock(&stats->lock);
}
void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie)
@@ -137,18 +146,23 @@ void block_acct_invalid(BlockAcctStats *stats, enum BlockAcctType type)
* not. The reason is that invalid requests are accounted during their
* submission, therefore there's no actual I/O involved.
*/
+ qemu_mutex_lock(&stats->lock);
stats->invalid_ops[type]++;
if (stats->account_invalid) {
stats->last_access_time_ns = qemu_clock_get_ns(clock_type);
}
+ qemu_mutex_unlock(&stats->lock);
}
void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
int num_requests)
{
assert(type < BLOCK_MAX_IOTYPE);
+
+ qemu_mutex_lock(&stats->lock);
stats->merged[type] += num_requests;
+ qemu_mutex_unlock(&stats->lock);
}
int64_t block_acct_idle_time_ns(BlockAcctStats *stats)
@@ -163,7 +177,9 @@ double block_acct_queue_depth(BlockAcctTimedStats *stats,
assert(type < BLOCK_MAX_IOTYPE);
+ qemu_mutex_lock(&stats->stats->lock);
sum = timed_average_sum(&stats->latency[type], &elapsed);
+ qemu_mutex_unlock(&stats->stats->lock);
return (double) sum / elapsed;
}
diff --git a/include/block/accounting.h b/include/block/accounting.h
index 55cb06fdb6..b833d26d6c 100644
--- a/include/block/accounting.h
+++ b/include/block/accounting.h
@@ -26,8 +26,10 @@
#define BLOCK_ACCOUNTING_H
#include "qemu/timed-average.h"
+#include "qemu/thread.h"
typedef struct BlockAcctTimedStats BlockAcctTimedStats;
+typedef struct BlockAcctStats BlockAcctStats;
enum BlockAcctType {
BLOCK_ACCT_READ,
@@ -37,12 +39,14 @@ enum BlockAcctType {
};
struct BlockAcctTimedStats {
+ BlockAcctStats *stats;
TimedAverage latency[BLOCK_MAX_IOTYPE];
unsigned interval_length; /* in seconds */
QSLIST_ENTRY(BlockAcctTimedStats) entries;
};
-typedef struct BlockAcctStats {
+struct BlockAcctStats {
+ QemuMutex lock;
uint64_t nr_bytes[BLOCK_MAX_IOTYPE];
uint64_t nr_ops[BLOCK_MAX_IOTYPE];
uint64_t invalid_ops[BLOCK_MAX_IOTYPE];
@@ -53,7 +57,7 @@ typedef struct BlockAcctStats {
QSLIST_HEAD(, BlockAcctTimedStats) intervals;
bool account_invalid;
bool account_failed;
-} BlockAcctStats;
+};
typedef struct BlockAcctCookie {
int64_t bytes;
--
2.13.0
^ permalink raw reply related [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (18 preceding siblings ...)
2017-06-05 12:39 ` [Qemu-devel] [PATCH 19/19] block: make accounting thread-safe Paolo Bonzini
@ 2017-06-05 13:18 ` no-reply
2017-06-07 0:04 ` Fam Zheng
20 siblings, 0 replies; 42+ messages in thread
From: no-reply @ 2017-06-05 13:18 UTC (permalink / raw)
To: pbonzini; +Cc: famz, qemu-devel
Hi,
This series failed automatic build test. Please find the testing commands and
their output below. If you have docker installed, you can probably reproduce it
locally.
Type: series
Message-id: 20170605123908.18777-1-pbonzini@redhat.com
Subject: [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1
=== TEST SCRIPT BEGIN ===
#!/bin/bash
set -e
git submodule update --init dtc
# Let docker tests dump environment info
export SHOW_ENV=1
export J=8
time make docker-test-quick@centos6
time make docker-test-mingw@fedora
time make docker-test-build@min-glib
=== TEST SCRIPT END ===
Updating 3c8cf5a9c21ff8782164d1def7f44bd888713384
From https://github.com/patchew-project/qemu
- [tag update] patchew/20170605104216.22429-1-stefanha@redhat.com -> patchew/20170605104216.22429-1-stefanha@redhat.com
* [new tag] patchew/20170605123908.18777-1-pbonzini@redhat.com -> patchew/20170605123908.18777-1-pbonzini@redhat.com
Switched to a new branch 'test'
deaf69a block: make accounting thread-safe
f56f97b block: split BlockAcctStats creation and setup
7c26e73 block: introduce block_account_one_io
54a8152 block: protect modification of dirty bitmaps with a mutex
7381c09 migration/block: reset dirty bitmap before reading
b87dcba block: introduce dirty_bitmap_mutex
a637293 block: protect tracked_requests and flush_queue with reqs_lock
7ee3fa8 block: access write_gen with atomics
afee525 block: use Stat64 for wr_highest_offset
ffe4063 util: add stats64 module
961139e throttle-groups: protect throttled requests with a CoMutex
6df55b0 throttle-groups: do not use qemu_co_enter_next
39c13df throttle-groups: only start one coroutine from drained_begin
c627884 block: access io_plugged with atomic ops
c7c4c42 block: access wakeup with atomic ops
e5bf035 block: access serialising_in_flight with atomic ops
b00ce21 block: access io_limits_disabled with atomic ops
6636742 block: access quiesce_counter with atomic ops
e87538d block: access copy_on_read with atomic ops
=== OUTPUT BEGIN ===
Submodule 'dtc' (git://git.qemu-project.org/dtc.git) registered for path 'dtc'
Cloning into '/var/tmp/patchew-tester-tmp-34mc_apg/src/dtc'...
Submodule path 'dtc': checked out '558cd81bdd432769b59bff01240c44f82cfb1a9d'
BUILD centos6
make[1]: Entering directory '/var/tmp/patchew-tester-tmp-34mc_apg/src'
ARCHIVE qemu.tgz
ARCHIVE dtc.tgz
COPY RUNNER
RUN test-quick in qemu:centos6
Packages installed:
SDL-devel-1.2.14-7.el6_7.1.x86_64
ccache-3.1.6-2.el6.x86_64
epel-release-6-8.noarch
gcc-4.4.7-17.el6.x86_64
git-1.7.1-4.el6_7.1.x86_64
glib2-devel-2.28.8-5.el6.x86_64
libfdt-devel-1.4.0-1.el6.x86_64
make-3.81-23.el6.x86_64
package g++ is not installed
pixman-devel-0.32.8-1.el6.x86_64
tar-1.23-15.el6_8.x86_64
zlib-devel-1.2.3-29.el6.x86_64
Environment variables:
PACKAGES=libfdt-devel ccache tar git make gcc g++ zlib-devel glib2-devel SDL-devel pixman-devel epel-release
HOSTNAME=ad7bccfc61fa
TERM=xterm
MAKEFLAGS= -j8
HISTSIZE=1000
J=8
USER=root
CCACHE_DIR=/var/tmp/ccache
EXTRA_CONFIGURE_OPTS=
V=
SHOW_ENV=1
MAIL=/var/spool/mail/root
PATH=/usr/lib/ccache:/usr/lib64/ccache:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
PWD=/
LANG=en_US.UTF-8
TARGET_LIST=
HISTCONTROL=ignoredups
SHLVL=1
HOME=/root
TEST_DIR=/tmp/qemu-test
LOGNAME=root
LESSOPEN=||/usr/bin/lesspipe.sh %s
FEATURES= dtc
DEBUG=
G_BROKEN_FILENAMES=1
CCACHE_HASHDIR=
_=/usr/bin/env
Configure options:
--enable-werror --target-list=x86_64-softmmu,aarch64-softmmu --prefix=/var/tmp/qemu-build/install
No C++ compiler available; disabling C++ specific optional code
Install prefix /var/tmp/qemu-build/install
BIOS directory /var/tmp/qemu-build/install/share/qemu
binary directory /var/tmp/qemu-build/install/bin
library directory /var/tmp/qemu-build/install/lib
module directory /var/tmp/qemu-build/install/lib/qemu
libexec directory /var/tmp/qemu-build/install/libexec
include directory /var/tmp/qemu-build/install/include
config directory /var/tmp/qemu-build/install/etc
local state directory /var/tmp/qemu-build/install/var
Manual directory /var/tmp/qemu-build/install/share/man
ELF interp prefix /usr/gnemul/qemu-%M
Source path /tmp/qemu-test/src
C compiler cc
Host C compiler cc
C++ compiler
Objective-C compiler cc
ARFLAGS rv
CFLAGS -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -g
QEMU_CFLAGS -I/usr/include/pixman-1 -I$(SRC_PATH)/dtc/libfdt -pthread -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -fPIE -DPIE -m64 -mcx16 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common -fwrapv -Wendif-labels -Wno-missing-include-dirs -Wempty-body -Wnested-externs -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers -Wold-style-declaration -Wold-style-definition -Wtype-limits -fstack-protector-all
LDFLAGS -Wl,--warn-common -Wl,-z,relro -Wl,-z,now -pie -m64 -g
make make
install install
python python -B
smbd /usr/sbin/smbd
module support no
host CPU x86_64
host big endian no
target list x86_64-softmmu aarch64-softmmu
tcg debug enabled no
gprof enabled no
sparse enabled no
strip binaries yes
profiler no
static build no
pixman system
SDL support yes (1.2.14)
GTK support no
GTK GL support no
VTE support no
TLS priority NORMAL
GNUTLS support no
GNUTLS rnd no
libgcrypt no
libgcrypt kdf no
nettle no
nettle kdf no
libtasn1 no
curses support no
virgl support no
curl support no
mingw32 support no
Audio drivers oss
Block whitelist (rw)
Block whitelist (ro)
VirtFS support no
VNC support yes
VNC SASL support no
VNC JPEG support no
VNC PNG support no
xen support no
brlapi support no
bluez support no
Documentation no
PIE yes
vde support no
netmap support no
Linux AIO support no
ATTR/XATTR support yes
Install blobs yes
KVM support yes
HAX support no
RDMA support no
TCG interpreter no
fdt support yes
preadv support yes
fdatasync yes
madvise yes
posix_madvise yes
libcap-ng support no
vhost-net support yes
vhost-scsi support yes
vhost-vsock support yes
Trace backends log
spice support no
rbd support no
xfsctl support no
smartcard support no
libusb no
usb net redir no
OpenGL support no
OpenGL dmabufs no
libiscsi support no
libnfs support no
build guest agent yes
QGA VSS support no
QGA w32 disk info no
QGA MSI support no
seccomp support no
coroutine backend ucontext
coroutine pool yes
debug stack usage no
GlusterFS support no
gcov gcov
gcov enabled no
TPM support yes
libssh2 support no
TPM passthrough yes
QOM debugging yes
Live block migration yes
lzo support no
snappy support no
bzip2 support no
NUMA host support no
tcmalloc support no
jemalloc support no
avx2 optimization no
replication support yes
VxHS block device no
mkdir -p dtc/libfdt
mkdir -p dtc/tests
GEN x86_64-softmmu/config-devices.mak.tmp
GEN aarch64-softmmu/config-devices.mak.tmp
GEN config-host.h
GEN qmp-commands.h
GEN qapi-types.h
GEN qemu-options.def
GEN qapi-visit.h
GEN qapi-event.h
GEN aarch64-softmmu/config-devices.mak
GEN x86_64-softmmu/config-devices.mak
GEN qapi-types.c
GEN qmp-marshal.c
GEN qapi-visit.c
GEN qapi-event.c
GEN qmp-introspect.h
GEN qmp-introspect.c
GEN trace/generated-tcg-tracers.h
GEN trace/generated-helpers-wrappers.h
GEN trace/generated-helpers.h
GEN trace/generated-helpers.c
GEN module_block.h
GEN tests/test-qapi-types.h
GEN tests/test-qapi-visit.h
GEN tests/test-qmp-commands.h
GEN tests/test-qapi-event.h
GEN tests/test-qmp-introspect.h
GEN trace-root.h
GEN util/trace.h
GEN crypto/trace.h
GEN io/trace.h
GEN migration/trace.h
GEN block/trace.h
GEN backends/trace.h
GEN chardev/trace.h
GEN hw/block/trace.h
GEN hw/block/dataplane/trace.h
GEN hw/char/trace.h
GEN hw/intc/trace.h
GEN hw/net/trace.h
GEN hw/virtio/trace.h
GEN hw/audio/trace.h
GEN hw/misc/trace.h
GEN hw/usb/trace.h
GEN hw/scsi/trace.h
GEN hw/nvram/trace.h
GEN hw/display/trace.h
GEN hw/input/trace.h
GEN hw/timer/trace.h
GEN hw/dma/trace.h
GEN hw/sparc/trace.h
GEN hw/sd/trace.h
GEN hw/isa/trace.h
GEN hw/mem/trace.h
GEN hw/i386/trace.h
GEN hw/i386/xen/trace.h
GEN hw/9pfs/trace.h
GEN hw/ppc/trace.h
GEN hw/pci/trace.h
GEN hw/s390x/trace.h
GEN hw/vfio/trace.h
GEN hw/acpi/trace.h
GEN hw/arm/trace.h
GEN hw/alpha/trace.h
GEN hw/xen/trace.h
GEN ui/trace.h
GEN audio/trace.h
GEN net/trace.h
GEN target/arm/trace.h
GEN target/i386/trace.h
GEN target/mips/trace.h
GEN target/sparc/trace.h
GEN target/s390x/trace.h
GEN target/ppc/trace.h
GEN qom/trace.h
GEN linux-user/trace.h
GEN qapi/trace.h
GEN trace-root.c
GEN util/trace.c
GEN crypto/trace.c
GEN io/trace.c
GEN migration/trace.c
GEN block/trace.c
GEN backends/trace.c
GEN chardev/trace.c
GEN hw/block/trace.c
GEN hw/block/dataplane/trace.c
GEN hw/char/trace.c
GEN hw/intc/trace.c
GEN hw/net/trace.c
GEN hw/virtio/trace.c
GEN hw/audio/trace.c
GEN hw/misc/trace.c
GEN hw/usb/trace.c
GEN hw/scsi/trace.c
GEN hw/nvram/trace.c
GEN hw/display/trace.c
GEN hw/input/trace.c
GEN hw/timer/trace.c
GEN hw/dma/trace.c
GEN hw/sparc/trace.c
GEN hw/sd/trace.c
GEN hw/isa/trace.c
GEN hw/mem/trace.c
GEN hw/i386/trace.c
GEN hw/i386/xen/trace.c
GEN hw/9pfs/trace.c
GEN hw/ppc/trace.c
GEN hw/pci/trace.c
GEN hw/s390x/trace.c
GEN hw/vfio/trace.c
GEN hw/acpi/trace.c
GEN hw/arm/trace.c
GEN hw/alpha/trace.c
GEN hw/xen/trace.c
GEN ui/trace.c
GEN audio/trace.c
GEN net/trace.c
GEN target/arm/trace.c
GEN target/i386/trace.c
GEN target/mips/trace.c
GEN target/sparc/trace.c
GEN target/s390x/trace.c
GEN target/ppc/trace.c
GEN qom/trace.c
GEN linux-user/trace.c
GEN qapi/trace.c
GEN config-all-devices.mak
DEP /tmp/qemu-test/src/dtc/tests/dumptrees.c
DEP /tmp/qemu-test/src/dtc/tests/trees.S
DEP /tmp/qemu-test/src/dtc/tests/testutils.c
DEP /tmp/qemu-test/src/dtc/tests/value-labels.c
DEP /tmp/qemu-test/src/dtc/tests/asm_tree_dump.c
DEP /tmp/qemu-test/src/dtc/tests/truncated_property.c
DEP /tmp/qemu-test/src/dtc/tests/check_path.c
DEP /tmp/qemu-test/src/dtc/tests/overlay_bad_fixup.c
DEP /tmp/qemu-test/src/dtc/tests/overlay.c
DEP /tmp/qemu-test/src/dtc/tests/subnode_iterate.c
DEP /tmp/qemu-test/src/dtc/tests/property_iterate.c
DEP /tmp/qemu-test/src/dtc/tests/integer-expressions.c
DEP /tmp/qemu-test/src/dtc/tests/utilfdt_test.c
DEP /tmp/qemu-test/src/dtc/tests/path_offset_aliases.c
DEP /tmp/qemu-test/src/dtc/tests/add_subnode_with_nops.c
DEP /tmp/qemu-test/src/dtc/tests/dtbs_equal_unordered.c
DEP /tmp/qemu-test/src/dtc/tests/dtb_reverse.c
DEP /tmp/qemu-test/src/dtc/tests/dtbs_equal_ordered.c
DEP /tmp/qemu-test/src/dtc/tests/extra-terminating-null.c
DEP /tmp/qemu-test/src/dtc/tests/incbin.c
DEP /tmp/qemu-test/src/dtc/tests/boot-cpuid.c
DEP /tmp/qemu-test/src/dtc/tests/phandle_format.c
DEP /tmp/qemu-test/src/dtc/tests/path-references.c
DEP /tmp/qemu-test/src/dtc/tests/references.c
DEP /tmp/qemu-test/src/dtc/tests/string_escapes.c
DEP /tmp/qemu-test/src/dtc/tests/propname_escapes.c
DEP /tmp/qemu-test/src/dtc/tests/appendprop2.c
DEP /tmp/qemu-test/src/dtc/tests/appendprop1.c
DEP /tmp/qemu-test/src/dtc/tests/del_node.c
DEP /tmp/qemu-test/src/dtc/tests/del_property.c
DEP /tmp/qemu-test/src/dtc/tests/setprop.c
DEP /tmp/qemu-test/src/dtc/tests/set_name.c
DEP /tmp/qemu-test/src/dtc/tests/rw_tree1.c
DEP /tmp/qemu-test/src/dtc/tests/open_pack.c
DEP /tmp/qemu-test/src/dtc/tests/nopulate.c
DEP /tmp/qemu-test/src/dtc/tests/mangle-layout.c
DEP /tmp/qemu-test/src/dtc/tests/move_and_save.c
DEP /tmp/qemu-test/src/dtc/tests/sw_tree1.c
DEP /tmp/qemu-test/src/dtc/tests/nop_node.c
DEP /tmp/qemu-test/src/dtc/tests/setprop_inplace.c
DEP /tmp/qemu-test/src/dtc/tests/nop_property.c
DEP /tmp/qemu-test/src/dtc/tests/stringlist.c
DEP /tmp/qemu-test/src/dtc/tests/addr_size_cells.c
DEP /tmp/qemu-test/src/dtc/tests/notfound.c
DEP /tmp/qemu-test/src/dtc/tests/sized_cells.c
DEP /tmp/qemu-test/src/dtc/tests/char_literal.c
DEP /tmp/qemu-test/src/dtc/tests/node_offset_by_compatible.c
DEP /tmp/qemu-test/src/dtc/tests/get_alias.c
DEP /tmp/qemu-test/src/dtc/tests/node_check_compatible.c
DEP /tmp/qemu-test/src/dtc/tests/node_offset_by_phandle.c
DEP /tmp/qemu-test/src/dtc/tests/node_offset_by_prop_value.c
DEP /tmp/qemu-test/src/dtc/tests/parent_offset.c
DEP /tmp/qemu-test/src/dtc/tests/supernode_atdepth_offset.c
DEP /tmp/qemu-test/src/dtc/tests/get_path.c
DEP /tmp/qemu-test/src/dtc/tests/get_phandle.c
DEP /tmp/qemu-test/src/dtc/tests/getprop.c
DEP /tmp/qemu-test/src/dtc/tests/get_name.c
DEP /tmp/qemu-test/src/dtc/tests/path_offset.c
DEP /tmp/qemu-test/src/dtc/tests/subnode_offset.c
DEP /tmp/qemu-test/src/dtc/tests/find_property.c
DEP /tmp/qemu-test/src/dtc/tests/root_node.c
DEP /tmp/qemu-test/src/dtc/tests/get_mem_rsv.c
DEP /tmp/qemu-test/src/dtc/libfdt/fdt_overlay.c
DEP /tmp/qemu-test/src/dtc/libfdt/fdt_addresses.c
DEP /tmp/qemu-test/src/dtc/libfdt/fdt_empty_tree.c
DEP /tmp/qemu-test/src/dtc/libfdt/fdt_strerror.c
DEP /tmp/qemu-test/src/dtc/libfdt/fdt_rw.c
DEP /tmp/qemu-test/src/dtc/libfdt/fdt_sw.c
DEP /tmp/qemu-test/src/dtc/libfdt/fdt_wip.c
DEP /tmp/qemu-test/src/dtc/libfdt/fdt_ro.c
DEP /tmp/qemu-test/src/dtc/libfdt/fdt.c
DEP /tmp/qemu-test/src/dtc/util.c
DEP /tmp/qemu-test/src/dtc/fdtput.c
DEP /tmp/qemu-test/src/dtc/fdtget.c
DEP /tmp/qemu-test/src/dtc/fdtdump.c
LEX convert-dtsv0-lexer.lex.c
make[1]: flex: Command not found
DEP /tmp/qemu-test/src/dtc/srcpos.c
BISON dtc-parser.tab.c
make[1]: bison: Command not found
LEX dtc-lexer.lex.c
make[1]: flex: Command not found
DEP /tmp/qemu-test/src/dtc/treesource.c
DEP /tmp/qemu-test/src/dtc/livetree.c
DEP /tmp/qemu-test/src/dtc/fstree.c
DEP /tmp/qemu-test/src/dtc/flattree.c
DEP /tmp/qemu-test/src/dtc/dtc.c
DEP /tmp/qemu-test/src/dtc/checks.c
DEP /tmp/qemu-test/src/dtc/data.c
CHK version_gen.h
LEX convert-dtsv0-lexer.lex.c
make[1]: flex: Command not found
BISON dtc-parser.tab.c
make[1]: bison: Command not found
LEX dtc-lexer.lex.c
make[1]: flex: Command not found
UPD version_gen.h
DEP /tmp/qemu-test/src/dtc/util.c
LEX convert-dtsv0-lexer.lex.c
BISON dtc-parser.tab.c
LEX dtc-lexer.lex.c
make[1]: flex: Command not found
make[1]: bison: Command not found
make[1]: flex: Command not found
CC libfdt/fdt.o
CC libfdt/fdt_ro.o
CC libfdt/fdt_sw.o
CC libfdt/fdt_rw.o
CC libfdt/fdt_wip.o
CC libfdt/fdt_strerror.o
CC libfdt/fdt_empty_tree.o
CC libfdt/fdt_addresses.o
CC libfdt/fdt_overlay.o
AR libfdt/libfdt.a
ar: creating libfdt/libfdt.a
a - libfdt/fdt.o
a - libfdt/fdt_ro.o
a - libfdt/fdt_wip.o
a - libfdt/fdt_sw.o
a - libfdt/fdt_rw.o
a - libfdt/fdt_strerror.o
a - libfdt/fdt_empty_tree.o
a - libfdt/fdt_addresses.o
a - libfdt/fdt_overlay.o
LEX convert-dtsv0-lexer.lex.c
BISON dtc-parser.tab.c
LEX dtc-lexer.lex.c
make[1]: flex: Command not found
make[1]: bison: Command not found
make[1]: flex: Command not found
CC tests/qemu-iotests/socket_scm_helper.o
GEN qga/qapi-generated/qga-qapi-types.c
GEN qga/qapi-generated/qga-qapi-types.h
GEN qga/qapi-generated/qga-qapi-visit.h
GEN qga/qapi-generated/qga-qmp-commands.h
GEN qga/qapi-generated/qga-qapi-visit.c
GEN qga/qapi-generated/qga-qmp-marshal.c
CC qmp-introspect.o
CC qapi-types.o
CC qapi-visit.o
CC qapi-event.o
CC qapi/qapi-visit-core.o
CC qapi/qapi-dealloc-visitor.o
CC qapi/qobject-input-visitor.o
CC qapi/qobject-output-visitor.o
CC qapi/qmp-registry.o
CC qapi/qmp-dispatch.o
CC qapi/string-input-visitor.o
CC qapi/string-output-visitor.o
CC qapi/opts-visitor.o
CC qapi/qapi-clone-visitor.o
CC qapi/qmp-event.o
CC qapi/qapi-util.o
CC qobject/qnull.o
CC qobject/qint.o
CC qobject/qstring.o
CC qobject/qdict.o
CC qobject/qlist.o
CC qobject/qfloat.o
CC qobject/qbool.o
CC qobject/qjson.o
CC qobject/qobject.o
CC qobject/json-lexer.o
CC qobject/json-parser.o
CC qobject/json-streamer.o
CC trace/control.o
CC trace/qmp.o
CC util/osdep.o
CC util/cutils.o
CC util/unicode.o
CC util/qemu-timer-common.o
CC util/bufferiszero.o
CC util/lockcnt.o
CC util/aiocb.o
CC util/async.o
CC util/thread-pool.o
CC util/qemu-timer.o
CC util/main-loop.o
CC util/iohandler.o
CC util/aio-posix.o
CC util/compatfd.o
CC util/event_notifier-posix.o
CC util/mmap-alloc.o
CC util/oslib-posix.o
CC util/qemu-openpty.o
CC util/qemu-thread-posix.o
CC util/memfd.o
CC util/envlist.o
CC util/module.o
CC util/path.o
CC util/host-utils.o
CC util/bitops.o
CC util/bitmap.o
CC util/hbitmap.o
CC util/fifo8.o
CC util/acl.o
CC util/error.o
CC util/qemu-error.o
CC util/id.o
CC util/iov.o
CC util/qemu-config.o
CC util/qemu-sockets.o
CC util/notify.o
CC util/uri.o
CC util/qemu-option.o
CC util/qemu-progress.o
CC util/keyval.o
CC util/hexdump.o
CC util/crc32c.o
CC util/uuid.o
CC util/throttle.o
CC util/getauxval.o
CC util/readline.o
CC util/rcu.o
CC util/qemu-coroutine.o
CC util/qemu-coroutine-lock.o
CC util/qemu-coroutine-io.o
CC util/qemu-coroutine-sleep.o
CC util/coroutine-ucontext.o
CC util/buffer.o
CC util/timed-average.o
CC util/base64.o
CC util/log.o
CC util/qdist.o
CC util/qht.o
CC util/range.o
CC util/stats64.o
CC util/systemd.o
CC trace-root.o
CC util/trace.o
CC crypto/trace.o
CC io/trace.o
CC migration/trace.o
CC block/trace.o
CC backends/trace.o
CC chardev/trace.o
CC hw/block/trace.o
CC hw/block/dataplane/trace.o
CC hw/char/trace.o
CC hw/intc/trace.o
CC hw/virtio/trace.o
CC hw/net/trace.o
CC hw/audio/trace.o
CC hw/misc/trace.o
CC hw/usb/trace.o
CC hw/scsi/trace.o
CC hw/nvram/trace.o
CC hw/display/trace.o
CC hw/input/trace.o
CC hw/timer/trace.o
CC hw/dma/trace.o
CC hw/sparc/trace.o
CC hw/sd/trace.o
CC hw/isa/trace.o
CC hw/mem/trace.o
CC hw/i386/trace.o
CC hw/i386/xen/trace.o
CC hw/9pfs/trace.o
CC hw/ppc/trace.o
CC hw/pci/trace.o
CC hw/s390x/trace.o
CC hw/vfio/trace.o
CC hw/acpi/trace.o
CC hw/arm/trace.o
CC hw/alpha/trace.o
CC hw/xen/trace.o
CC ui/trace.o
CC audio/trace.o
CC net/trace.o
CC target/arm/trace.o
CC target/mips/trace.o
CC target/i386/trace.o
CC target/sparc/trace.o
CC target/s390x/trace.o
CC target/ppc/trace.o
CC linux-user/trace.o
CC qapi/trace.o
CC qom/trace.o
CC crypto/pbkdf-stub.o
CC stubs/arch-query-cpu-model-expansion.o
CC stubs/arch-query-cpu-def.o
CC stubs/arch-query-cpu-model-comparison.o
CC stubs/arch-query-cpu-model-baseline.o
CC stubs/bdrv-next-monitor-owned.o
CC stubs/blk-commit-all.o
CC stubs/clock-warp.o
CC stubs/blockdev-close-all-bdrv-states.o
CC stubs/cpu-get-icount.o
CC stubs/cpu-get-clock.o
CC stubs/dump.o
CC stubs/error-printf.o
CC stubs/fdset.o
CC stubs/gdbstub.o
CC stubs/get-vm-name.o
CC stubs/iothread.o
CC stubs/iothread-lock.o
CC stubs/is-daemonized.o
CC stubs/machine-init-done.o
CC stubs/migr-blocker.o
CC stubs/monitor.o
CC stubs/notify-event.o
CC stubs/qtest.o
CC stubs/replay.o
CC stubs/runstate-check.o
CC stubs/set-fd-handler.o
CC stubs/slirp.o
CC stubs/sysbus.o
CC stubs/trace-control.o
CC stubs/vm-stop.o
CC stubs/uuid.o
CC stubs/vmstate.o
CC stubs/qmp_pc_dimm_device_list.o
CC stubs/target-monitor-defs.o
CC stubs/target-get-monitor-def.o
CC stubs/pc_madt_cpu_entry.o
CC stubs/vmgenid.o
CC stubs/xen-common.o
CC stubs/xen-hvm.o
CC contrib/ivshmem-client/ivshmem-client.o
CC contrib/ivshmem-client/main.o
CC contrib/ivshmem-server/main.o
CC qemu-nbd.o
CC contrib/ivshmem-server/ivshmem-server.o
CC blockjob.o
CC qemu-io-cmds.o
CC block.o
CC replication.o
CC block/raw-format.o
CC block/qcow.o
CC block/vdi.o
CC block/vmdk.o
CC block/cloop.o
CC block/bochs.o
CC block/vpc.o
CC block/vvfat.o
CC block/dmg.o
CC block/qcow2.o
CC block/qcow2-refcount.o
CC block/qcow2-cluster.o
CC block/qcow2-snapshot.o
CC block/qcow2-cache.o
CC block/qed.o
CC block/qed-gencb.o
CC block/qed-l2-cache.o
CC block/qed-table.o
CC block/qed-cluster.o
CC block/qed-check.o
CC block/vhdx.o
CC block/vhdx-endian.o
CC block/vhdx-log.o
CC block/quorum.o
CC block/parallels.o
CC block/blkdebug.o
CC block/blkverify.o
CC block/blkreplay.o
CC block/block-backend.o
CC block/snapshot.o
CC block/qapi.o
CC block/file-posix.o
CC block/null.o
CC block/mirror.o
CC block/commit.o
CC block/io.o
CC block/throttle-groups.o
CC block/nbd.o
CC block/nbd-client.o
CC block/sheepdog.o
CC block/accounting.o
CC block/dirty-bitmap.o
CC block/write-threshold.o
CC block/backup.o
CC block/replication.o
CC block/crypto.o
CC nbd/server.o
CC nbd/client.o
CC nbd/common.o
CC crypto/init.o
CC crypto/hash.o
CC crypto/hash-glib.o
CC crypto/hmac.o
CC crypto/hmac-glib.o
CC crypto/aes.o
CC crypto/desrfb.o
CC crypto/cipher.o
CC crypto/tlscreds.o
CC crypto/tlscredsanon.o
CC crypto/tlscredsx509.o
CC crypto/tlssession.o
CC crypto/secret.o
CC crypto/random-platform.o
CC crypto/pbkdf.o
CC crypto/ivgen.o
CC crypto/ivgen-essiv.o
CC crypto/ivgen-plain.o
CC crypto/ivgen-plain64.o
CC crypto/afsplit.o
CC crypto/xts.o
CC crypto/block.o
CC crypto/block-qcow.o
CC crypto/block-luks.o
CC io/channel-buffer.o
CC io/channel.o
CC io/channel-command.o
CC io/channel-file.o
CC io/channel-socket.o
CC io/channel-tls.o
CC io/channel-watch.o
CC io/channel-websock.o
CC io/channel-util.o
CC io/dns-resolver.o
CC io/task.o
CC qom/object.o
CC qom/container.o
CC qom/qom-qobject.o
CC qom/object_interfaces.o
GEN qemu-img-cmds.h
CC qemu-io.o
CC qemu-bridge-helper.o
CC blockdev.o
CC blockdev-nbd.o
CC iothread.o
CC qdev-monitor.o
CC device-hotplug.o
CC os-posix.o
CC accel.o
CC bt-host.o
CC bt-vhci.o
CC dma-helpers.o
CC vl.o
CC tpm.o
CC device_tree.o
CC qmp-marshal.o
CC qmp.o
CC hmp.o
CC cpus-common.o
CC audio/audio.o
CC audio/noaudio.o
CC audio/wavaudio.o
CC audio/mixeng.o
CC audio/sdlaudio.o
CC audio/ossaudio.o
CC audio/wavcapture.o
CC backends/rng.o
CC backends/rng-egd.o
CC backends/rng-random.o
CC backends/tpm.o
CC backends/hostmem.o
CC backends/hostmem-ram.o
CC backends/hostmem-file.o
CC backends/cryptodev.o
CC backends/cryptodev-builtin.o
CC block/stream.o
CC chardev/msmouse.o
CC chardev/wctablet.o
CC chardev/testdev.o
CC disas/arm.o
CC disas/i386.o
CC fsdev/qemu-fsdev-dummy.o
CC fsdev/qemu-fsdev-opts.o
CC hw/acpi/core.o
CC fsdev/qemu-fsdev-throttle.o
CC hw/acpi/piix4.o
CC hw/acpi/pcihp.o
CC hw/acpi/ich9.o
CC hw/acpi/tco.o
CC hw/acpi/cpu_hotplug.o
CC hw/acpi/memory_hotplug.o
CC hw/acpi/cpu.o
CC hw/acpi/nvdimm.o
CC hw/acpi/vmgenid.o
CC hw/acpi/acpi_interface.o
CC hw/acpi/bios-linker-loader.o
CC hw/acpi/aml-build.o
CC hw/acpi/ipmi.o
CC hw/acpi/acpi-stub.o
CC hw/acpi/ipmi-stub.o
CC hw/audio/sb16.o
CC hw/audio/es1370.o
CC hw/audio/ac97.o
CC hw/audio/fmopl.o
CC hw/audio/adlib.o
CC hw/audio/gus.o
CC hw/audio/gusemu_hal.o
CC hw/audio/gusemu_mixer.o
CC hw/audio/cs4231a.o
CC hw/audio/intel-hda.o
CC hw/audio/hda-codec.o
CC hw/audio/pcspk.o
CC hw/audio/wm8750.o
CC hw/audio/pl041.o
CC hw/audio/lm4549.o
CC hw/audio/marvell_88w8618.o
CC hw/audio/soundhw.o
CC hw/block/block.o
CC hw/block/cdrom.o
CC hw/block/hd-geometry.o
CC hw/block/fdc.o
CC hw/block/m25p80.o
CC hw/block/nand.o
CC hw/block/pflash_cfi01.o
CC hw/block/pflash_cfi02.o
CC hw/block/ecc.o
CC hw/block/onenand.o
CC hw/block/nvme.o
CC hw/bt/core.o
CC hw/bt/l2cap.o
CC hw/bt/sdp.o
CC hw/bt/hci.o
CC hw/bt/hid.o
CC hw/bt/hci-csr.o
CC hw/char/ipoctal232.o
CC hw/char/parallel.o
CC hw/char/pl011.o
CC hw/char/serial.o
CC hw/char/serial-isa.o
CC hw/char/serial-pci.o
CC hw/char/virtio-console.o
CC hw/char/cadence_uart.o
CC hw/char/debugcon.o
CC hw/char/imx_serial.o
CC hw/core/qdev.o
CC hw/core/qdev-properties.o
CC hw/core/bus.o
CC hw/core/reset.o
CC hw/core/fw-path-provider.o
CC hw/core/irq.o
CC hw/core/hotplug.o
CC hw/core/sysbus.o
CC hw/core/ptimer.o
CC hw/core/machine.o
CC hw/core/loader.o
CC hw/core/qdev-properties-system.o
CC hw/core/register.o
CC hw/core/platform-bus.o
CC hw/core/or-irq.o
CC hw/display/ads7846.o
CC hw/display/cirrus_vga.o
CC hw/display/pl110.o
CC hw/display/ssd0303.o
CC hw/display/ssd0323.o
CC hw/display/vga-pci.o
CC hw/display/vga-isa.o
CC hw/display/vmware_vga.o
CC hw/display/blizzard.o
CC hw/display/exynos4210_fimd.o
CC hw/display/framebuffer.o
CC hw/display/tc6393xb.o
CC hw/dma/pl080.o
CC hw/dma/pl330.o
CC hw/dma/i8257.o
CC hw/dma/xlnx-zynq-devcfg.o
CC hw/gpio/max7310.o
CC hw/gpio/pl061.o
CC hw/gpio/zaurus.o
CC hw/gpio/gpio_key.o
CC hw/i2c/core.o
CC hw/i2c/smbus.o
CC hw/i2c/smbus_eeprom.o
CC hw/i2c/i2c-ddc.o
CC hw/i2c/smbus_ich9.o
CC hw/i2c/versatile_i2c.o
CC hw/i2c/pm_smbus.o
CC hw/i2c/bitbang_i2c.o
CC hw/i2c/exynos4210_i2c.o
CC hw/i2c/imx_i2c.o
CC hw/i2c/aspeed_i2c.o
CC hw/ide/core.o
CC hw/ide/atapi.o
CC hw/ide/qdev.o
CC hw/ide/pci.o
CC hw/ide/isa.o
CC hw/ide/piix.o
CC hw/ide/microdrive.o
CC hw/ide/ahci.o
CC hw/ide/ich.o
CC hw/input/hid.o
CC hw/input/lm832x.o
CC hw/input/pckbd.o
CC hw/input/pl050.o
CC hw/input/ps2.o
CC hw/input/stellaris_input.o
CC hw/input/tsc2005.o
CC hw/input/vmmouse.o
CC hw/input/virtio-input.o
CC hw/input/virtio-input-hid.o
CC hw/input/virtio-input-host.o
CC hw/intc/i8259_common.o
CC hw/intc/i8259.o
CC hw/intc/pl190.o
CC hw/intc/imx_avic.o
CC hw/intc/ioapic_common.o
CC hw/intc/realview_gic.o
CC hw/intc/arm_gic_common.o
CC hw/intc/arm_gic.o
CC hw/intc/arm_gicv2m.o
CC hw/intc/arm_gicv3_common.o
CC hw/intc/arm_gicv3.o
CC hw/intc/arm_gicv3_dist.o
CC hw/intc/arm_gicv3_redist.o
CC hw/intc/arm_gicv3_its_common.o
CC hw/intc/intc.o
CC hw/ipack/ipack.o
CC hw/ipack/tpci200.o
CC hw/ipmi/ipmi.o
CC hw/ipmi/ipmi_bmc_sim.o
CC hw/ipmi/ipmi_bmc_extern.o
CC hw/ipmi/isa_ipmi_kcs.o
CC hw/ipmi/isa_ipmi_bt.o
CC hw/isa/isa-bus.o
CC hw/isa/apm.o
CC hw/mem/pc-dimm.o
CC hw/mem/nvdimm.o
CC hw/misc/applesmc.o
CC hw/misc/max111x.o
CC hw/misc/tmp105.o
CC hw/misc/debugexit.o
CC hw/misc/sga.o
CC hw/misc/pc-testdev.o
CC hw/misc/unimp.o
CC hw/misc/pci-testdev.o
CC hw/misc/arm_l2x0.o
CC hw/misc/arm_integrator_debug.o
CC hw/misc/a9scu.o
CC hw/misc/arm11scu.o
CC hw/net/ne2000.o
CC hw/net/eepro100.o
CC hw/net/pcnet-pci.o
CC hw/net/pcnet.o
CC hw/net/e1000.o
CC hw/net/e1000x_common.o
CC hw/net/net_tx_pkt.o
CC hw/net/net_rx_pkt.o
CC hw/net/e1000e.o
CC hw/net/e1000e_core.o
CC hw/net/rtl8139.o
CC hw/net/vmxnet3.o
CC hw/net/smc91c111.o
CC hw/net/lan9118.o
CC hw/net/ne2000-isa.o
CC hw/net/xgmac.o
CC hw/net/allwinner_emac.o
CC hw/net/imx_fec.o
CC hw/net/cadence_gem.o
CC hw/net/stellaris_enet.o
CC hw/net/ftgmac100.o
CC hw/net/rocker/rocker.o
CC hw/net/rocker/rocker_fp.o
CC hw/net/rocker/rocker_desc.o
CC hw/net/rocker/rocker_world.o
CC hw/net/rocker/rocker_of_dpa.o
CC hw/nvram/eeprom93xx.o
CC hw/nvram/fw_cfg.o
CC hw/nvram/chrp_nvram.o
CC hw/pci-bridge/pci_bridge_dev.o
CC hw/pci-bridge/pcie_root_port.o
CC hw/pci-bridge/gen_pcie_root_port.o
CC hw/pci-bridge/pci_expander_bridge.o
CC hw/pci-bridge/xio3130_upstream.o
CC hw/pci-bridge/xio3130_downstream.o
CC hw/pci-bridge/ioh3420.o
CC hw/pci-bridge/i82801b11.o
CC hw/pci-host/pam.o
CC hw/pci-host/versatile.o
CC hw/pci-host/piix.o
CC hw/pci-host/q35.o
CC hw/pci-host/gpex.o
CC hw/pci/pci.o
CC hw/pci/pci_bridge.o
CC hw/pci/msix.o
CC hw/pci/msi.o
CC hw/pci/shpc.o
CC hw/pci/slotid_cap.o
CC hw/pci/pci_host.o
CC hw/pci/pcie.o
CC hw/pci/pcie_host.o
CC hw/pci/pcie_aer.o
CC hw/pci/pcie_port.o
CC hw/pci/pci-stub.o
CC hw/pcmcia/pcmcia.o
CC hw/scsi/scsi-disk.o
CC hw/scsi/scsi-generic.o
CC hw/scsi/scsi-bus.o
CC hw/scsi/lsi53c895a.o
CC hw/scsi/mptsas.o
CC hw/scsi/mptconfig.o
CC hw/scsi/mptendian.o
CC hw/scsi/megasas.o
CC hw/scsi/vmw_pvscsi.o
CC hw/scsi/esp.o
CC hw/scsi/esp-pci.o
CC hw/sd/pl181.o
CC hw/sd/ssi-sd.o
CC hw/sd/sd.o
CC hw/sd/core.o
CC hw/sd/sdhci.o
CC hw/smbios/smbios.o
CC hw/smbios/smbios_type_38.o
CC hw/smbios/smbios-stub.o
CC hw/smbios/smbios_type_38-stub.o
CC hw/ssi/pl022.o
CC hw/ssi/ssi.o
CC hw/ssi/xilinx_spips.o
CC hw/ssi/aspeed_smc.o
CC hw/ssi/stm32f2xx_spi.o
CC hw/timer/arm_timer.o
CC hw/timer/arm_mptimer.o
CC hw/timer/a9gtimer.o
CC hw/timer/armv7m_systick.o
CC hw/timer/cadence_ttc.o
CC hw/timer/ds1338.o
CC hw/timer/hpet.o
CC hw/timer/i8254_common.o
CC hw/timer/i8254.o
CC hw/timer/pl031.o
CC hw/timer/twl92230.o
CC hw/timer/imx_epit.o
CC hw/timer/imx_gpt.o
CC hw/timer/stm32f2xx_timer.o
CC hw/timer/aspeed_timer.o
CC hw/tpm/tpm_tis.o
CC hw/tpm/tpm_passthrough.o
CC hw/tpm/tpm_util.o
CC hw/usb/core.o
CC hw/usb/bus.o
CC hw/usb/combined-packet.o
CC hw/usb/libhw.o
CC hw/usb/desc.o
CC hw/usb/desc-msos.o
CC hw/usb/hcd-uhci.o
CC hw/usb/hcd-ohci.o
CC hw/usb/hcd-ehci.o
CC hw/usb/hcd-ehci-pci.o
CC hw/usb/hcd-ehci-sysbus.o
CC hw/usb/hcd-xhci.o
CC hw/usb/hcd-xhci-nec.o
CC hw/usb/hcd-musb.o
CC hw/usb/dev-hub.o
CC hw/usb/dev-hid.o
CC hw/usb/dev-wacom.o
CC hw/usb/dev-storage.o
CC hw/usb/dev-uas.o
CC hw/usb/dev-audio.o
CC hw/usb/dev-serial.o
CC hw/usb/dev-network.o
CC hw/usb/dev-bluetooth.o
CC hw/usb/dev-smartcard-reader.o
CC hw/usb/dev-mtp.o
CC hw/usb/host-stub.o
CC hw/virtio/virtio-rng.o
CC hw/virtio/virtio-pci.o
CC hw/virtio/virtio-bus.o
CC hw/virtio/virtio-mmio.o
CC hw/virtio/vhost-stub.o
CC hw/watchdog/watchdog.o
CC hw/watchdog/wdt_i6300esb.o
CC hw/watchdog/wdt_ib700.o
CC hw/watchdog/wdt_aspeed.o
CC migration/migration.o
CC migration/socket.o
CC migration/fd.o
CC migration/exec.o
CC migration/tls.o
CC migration/channel.o
CC migration/savevm.o
CC migration/colo-comm.o
CC migration/colo.o
CC migration/colo-failover.o
CC migration/vmstate.o
CC migration/vmstate-types.o
CC migration/page_cache.o
CC migration/qemu-file.o
CC migration/qemu-file-channel.o
CC migration/xbzrle.o
CC migration/postcopy-ram.o
CC migration/qjson.o
CC migration/block.o
CC net/net.o
CC net/queue.o
CC net/checksum.o
CC net/util.o
CC net/hub.o
CC net/socket.o
CC net/dump.o
CC net/eth.o
CC net/l2tpv3.o
CC net/vhost-user.o
CC net/slirp.o
CC net/filter.o
CC net/filter-buffer.o
CC net/filter-mirror.o
CC net/colo-compare.o
CC net/colo.o
CC net/filter-rewriter.o
CC net/filter-replay.o
CC net/tap.o
CC net/tap-linux.o
CC replay/replay.o
CC qom/cpu.o
CC replay/replay-internal.o
CC replay/replay-events.o
/tmp/qemu-test/src/replay/replay-internal.c: In function ‘replay_put_array’:
/tmp/qemu-test/src/replay/replay-internal.c:65: warning: ignoring return value of ‘fwrite’, declared with attribute warn_unused_result
CC replay/replay-time.o
CC replay/replay-input.o
CC replay/replay-char.o
CC replay/replay-snapshot.o
CC replay/replay-net.o
CC slirp/cksum.o
CC replay/replay-audio.o
CC slirp/if.o
CC slirp/ip_icmp.o
CC slirp/ip6_icmp.o
CC slirp/ip6_input.o
CC slirp/ip6_output.o
CC slirp/ip_input.o
CC slirp/ip_output.o
CC slirp/dnssearch.o
CC slirp/dhcpv6.o
CC slirp/slirp.o
CC slirp/mbuf.o
CC slirp/misc.o
CC slirp/sbuf.o
CC slirp/socket.o
CC slirp/tcp_input.o
CC slirp/tcp_output.o
CC slirp/tcp_subr.o
CC slirp/udp.o
CC slirp/tcp_timer.o
CC slirp/udp6.o
/tmp/qemu-test/src/slirp/tcp_input.c: In function ‘tcp_input’:
/tmp/qemu-test/src/slirp/tcp_input.c:219: warning: ‘save_ip.ip_p’ may be used uninitialized in this function
/tmp/qemu-test/src/slirp/tcp_input.c:219: warning: ‘save_ip.ip_len’ may be used uninitialized in this function
/tmp/qemu-test/src/slirp/tcp_input.c:219: warning: ‘save_ip.ip_tos’ may be used uninitialized in this function
/tmp/qemu-test/src/slirp/tcp_input.c:219: warning: ‘save_ip.ip_id’ may be used uninitialized in this function
/tmp/qemu-test/src/slirp/tcp_input.c:219: warning: ‘save_ip.ip_off’ may be used uninitialized in this function
/tmp/qemu-test/src/slirp/tcp_input.c:219: warning: ‘save_ip.ip_ttl’ may be used uninitialized in this function
/tmp/qemu-test/src/slirp/tcp_input.c:219: warning: ‘save_ip.ip_sum’ may be used uninitialized in this function
/tmp/qemu-test/src/slirp/tcp_input.c:219: warning: ‘save_ip.ip_src.s_addr’ may be used uninitialized in this function
/tmp/qemu-test/src/slirp/tcp_input.c:219: warning: ‘save_ip.ip_dst.s_addr’ may be used uninitialized in this function
/tmp/qemu-test/src/slirp/tcp_input.c:220: warning: ‘save_ip6.ip_nh’ may be used uninitialized in this function
CC slirp/bootp.o
CC slirp/tftp.o
CC slirp/arp_table.o
CC slirp/ndp_table.o
CC slirp/ncsi.o
CC ui/keymaps.o
CC ui/console.o
CC ui/cursor.o
CC ui/qemu-pixman.o
CC ui/input.o
CC ui/input-keymap.o
CC ui/input-legacy.o
CC ui/input-linux.o
CC ui/sdl.o
CC ui/sdl_zoom.o
CC ui/x_keymap.o
CC ui/vnc.o
CC ui/vnc-enc-zlib.o
CC ui/vnc-enc-hextile.o
CC ui/vnc-enc-tight.o
CC ui/vnc-palette.o
CC ui/vnc-enc-zrle.o
CC ui/vnc-auth-vencrypt.o
CC ui/vnc-ws.o
CC ui/vnc-jobs.o
CC chardev/char.o
CC chardev/char-fd.o
CC chardev/char-fe.o
CC chardev/char-file.o
CC chardev/char-io.o
CC chardev/char-parallel.o
CC chardev/char-null.o
CC chardev/char-mux.o
CC chardev/char-pipe.o
CC chardev/char-pty.o
CC chardev/char-ringbuf.o
CC chardev/char-serial.o
CC chardev/char-socket.o
CC chardev/char-stdio.o
CC chardev/char-udp.o
LINK tests/qemu-iotests/socket_scm_helper
CC qga/commands.o
CC qga/guest-agent-command-state.o
CC qga/main.o
CC qga/commands-posix.o
CC qga/channel-posix.o
CC qga/qapi-generated/qga-qapi-types.o
CC qga/qapi-generated/qga-qapi-visit.o
AS optionrom/multiboot.o
CC optionrom/linuxboot_dma.o
AS optionrom/linuxboot.o
cc: unrecognized option '-no-integrated-as'
cc: unrecognized option '-no-integrated-as'
AS optionrom/kvmvapic.o
CC qga/qapi-generated/qga-qmp-marshal.o
AR libqemuutil.a
BUILD optionrom/multiboot.img
BUILD optionrom/linuxboot_dma.img
AR libqemustub.a
BUILD optionrom/linuxboot.img
BUILD optionrom/kvmvapic.img
CC qemu-img.o
BUILD optionrom/multiboot.raw
BUILD optionrom/linuxboot_dma.raw
BUILD optionrom/kvmvapic.raw
BUILD optionrom/linuxboot.raw
SIGN optionrom/kvmvapic.bin
SIGN optionrom/multiboot.bin
SIGN optionrom/linuxboot_dma.bin
SIGN optionrom/linuxboot.bin
LINK ivshmem-client
LINK ivshmem-server
LINK qemu-nbd
LINK qemu-io
LINK qemu-bridge-helper
LINK qemu-ga
LINK qemu-img
GEN x86_64-softmmu/hmp-commands.h
GEN x86_64-softmmu/hmp-commands-info.h
GEN x86_64-softmmu/config-target.h
GEN aarch64-softmmu/hmp-commands.h
GEN aarch64-softmmu/hmp-commands-info.h
GEN aarch64-softmmu/config-target.h
CC x86_64-softmmu/cpu-exec.o
CC x86_64-softmmu/exec.o
CC x86_64-softmmu/translate-all.o
CC x86_64-softmmu/translate-common.o
CC x86_64-softmmu/cpu-exec-common.o
CC x86_64-softmmu/tcg/tcg.o
CC x86_64-softmmu/tcg/tcg-op.o
CC aarch64-softmmu/exec.o
CC aarch64-softmmu/translate-all.o
CC x86_64-softmmu/tcg/optimize.o
CC aarch64-softmmu/cpu-exec.o
CC x86_64-softmmu/tcg/tcg-common.o
CC aarch64-softmmu/translate-common.o
CC aarch64-softmmu/cpu-exec-common.o
CC aarch64-softmmu/tcg/tcg.o
CC aarch64-softmmu/tcg/tcg-op.o
CC aarch64-softmmu/tcg/optimize.o
CC x86_64-softmmu/fpu/softfloat.o
CC aarch64-softmmu/tcg/tcg-common.o
CC x86_64-softmmu/disas.o
CC x86_64-softmmu/tcg-runtime.o
GEN x86_64-softmmu/gdbstub-xml.c
CC x86_64-softmmu/hax-stub.o
CC x86_64-softmmu/arch_init.o
CC x86_64-softmmu/cpus.o
CC aarch64-softmmu/fpu/softfloat.o
CC aarch64-softmmu/disas.o
CC x86_64-softmmu/monitor.o
CC aarch64-softmmu/tcg-runtime.o
GEN aarch64-softmmu/gdbstub-xml.c
CC x86_64-softmmu/gdbstub.o
CC x86_64-softmmu/balloon.o
CC x86_64-softmmu/ioport.o
CC aarch64-softmmu/hax-stub.o
CC x86_64-softmmu/numa.o
CC aarch64-softmmu/kvm-stub.o
CC x86_64-softmmu/qtest.o
CC aarch64-softmmu/arch_init.o
CC aarch64-softmmu/cpus.o
CC x86_64-softmmu/bootdevice.o
CC x86_64-softmmu/kvm-all.o
CC x86_64-softmmu/memory.o
CC aarch64-softmmu/monitor.o
CC aarch64-softmmu/gdbstub.o
CC x86_64-softmmu/cputlb.o
CC aarch64-softmmu/balloon.o
CC aarch64-softmmu/ioport.o
CC x86_64-softmmu/memory_mapping.o
CC x86_64-softmmu/dump.o
CC aarch64-softmmu/numa.o
CC x86_64-softmmu/migration/ram.o
CC aarch64-softmmu/qtest.o
CC x86_64-softmmu/hw/block/virtio-blk.o
CC x86_64-softmmu/hw/block/dataplane/virtio-blk.o
CC x86_64-softmmu/hw/char/virtio-serial-bus.o
CC x86_64-softmmu/hw/core/nmi.o
CC x86_64-softmmu/hw/core/generic-loader.o
CC x86_64-softmmu/hw/core/null-machine.o
CC x86_64-softmmu/hw/cpu/core.o
CC aarch64-softmmu/bootdevice.o
CC x86_64-softmmu/hw/display/vga.o
CC x86_64-softmmu/hw/display/virtio-gpu.o
CC aarch64-softmmu/memory.o
CC aarch64-softmmu/cputlb.o
CC x86_64-softmmu/hw/display/virtio-gpu-3d.o
CC x86_64-softmmu/hw/display/virtio-gpu-pci.o
CC x86_64-softmmu/hw/display/virtio-vga.o
CC x86_64-softmmu/hw/intc/apic.o
CC aarch64-softmmu/memory_mapping.o
CC x86_64-softmmu/hw/intc/apic_common.o
CC aarch64-softmmu/dump.o
CC aarch64-softmmu/migration/ram.o
CC x86_64-softmmu/hw/intc/ioapic.o
CC x86_64-softmmu/hw/isa/lpc_ich9.o
CC aarch64-softmmu/hw/adc/stm32f2xx_adc.o
CC x86_64-softmmu/hw/misc/vmport.o
CC x86_64-softmmu/hw/misc/ivshmem.o
CC x86_64-softmmu/hw/misc/pvpanic.o
CC x86_64-softmmu/hw/misc/edu.o
CC x86_64-softmmu/hw/misc/hyperv_testdev.o
CC x86_64-softmmu/hw/net/virtio-net.o
CC x86_64-softmmu/hw/net/vhost_net.o
CC x86_64-softmmu/hw/scsi/virtio-scsi.o
CC x86_64-softmmu/hw/scsi/virtio-scsi-dataplane.o
CC x86_64-softmmu/hw/scsi/vhost-scsi-common.o
CC x86_64-softmmu/hw/scsi/vhost-scsi.o
CC x86_64-softmmu/hw/timer/mc146818rtc.o
CC x86_64-softmmu/hw/vfio/common.o
CC aarch64-softmmu/hw/block/virtio-blk.o
CC x86_64-softmmu/hw/vfio/pci.o
CC x86_64-softmmu/hw/vfio/pci-quirks.o
CC aarch64-softmmu/hw/block/dataplane/virtio-blk.o
CC aarch64-softmmu/hw/char/exynos4210_uart.o
CC x86_64-softmmu/hw/vfio/platform.o
CC x86_64-softmmu/hw/vfio/spapr.o
CC aarch64-softmmu/hw/char/omap_uart.o
CC x86_64-softmmu/hw/virtio/virtio.o
CC x86_64-softmmu/hw/virtio/virtio-balloon.o
CC x86_64-softmmu/hw/virtio/vhost.o
CC x86_64-softmmu/hw/virtio/vhost-backend.o
CC x86_64-softmmu/hw/virtio/vhost-user.o
CC aarch64-softmmu/hw/char/digic-uart.o
CC x86_64-softmmu/hw/virtio/vhost-vsock.o
CC x86_64-softmmu/hw/virtio/virtio-crypto.o
CC x86_64-softmmu/hw/virtio/virtio-crypto-pci.o
CC x86_64-softmmu/hw/i386/multiboot.o
CC aarch64-softmmu/hw/char/stm32f2xx_usart.o
CC x86_64-softmmu/hw/i386/pc.o
CC aarch64-softmmu/hw/char/bcm2835_aux.o
CC x86_64-softmmu/hw/i386/pc_piix.o
/tmp/qemu-test/src/hw/i386/pc_piix.c: In function ‘igd_passthrough_isa_bridge_create’:
/tmp/qemu-test/src/hw/i386/pc_piix.c:1067: warning: ‘pch_rev_id’ may be used uninitialized in this function
CC x86_64-softmmu/hw/i386/pc_q35.o
CC x86_64-softmmu/hw/i386/pc_sysfw.o
CC x86_64-softmmu/hw/i386/x86-iommu.o
CC x86_64-softmmu/hw/i386/intel_iommu.o
CC x86_64-softmmu/hw/i386/amd_iommu.o
CC x86_64-softmmu/hw/i386/kvmvapic.o
CC x86_64-softmmu/hw/i386/acpi-build.o
CC x86_64-softmmu/hw/i386/pci-assign-load-rom.o
CC x86_64-softmmu/hw/i386/kvm/clock.o
CC aarch64-softmmu/hw/char/virtio-serial-bus.o
/tmp/qemu-test/src/hw/i386/acpi-build.c: In function ‘build_append_pci_bus_devices’:
/tmp/qemu-test/src/hw/i386/acpi-build.c:525: warning: ‘notify_method’ may be used uninitialized in this function
CC x86_64-softmmu/hw/i386/kvm/apic.o
CC aarch64-softmmu/hw/core/nmi.o
CC aarch64-softmmu/hw/core/generic-loader.o
CC x86_64-softmmu/hw/i386/kvm/i8259.o
CC aarch64-softmmu/hw/core/null-machine.o
CC x86_64-softmmu/hw/i386/kvm/ioapic.o
CC x86_64-softmmu/hw/i386/kvm/i8254.o
CC aarch64-softmmu/hw/cpu/arm11mpcore.o
CC aarch64-softmmu/hw/cpu/realview_mpcore.o
CC x86_64-softmmu/hw/i386/kvm/pci-assign.o
CC x86_64-softmmu/target/i386/translate.o
CC x86_64-softmmu/target/i386/helper.o
CC aarch64-softmmu/hw/cpu/a9mpcore.o
CC x86_64-softmmu/target/i386/cpu.o
CC aarch64-softmmu/hw/cpu/core.o
CC x86_64-softmmu/target/i386/bpt_helper.o
CC aarch64-softmmu/hw/display/omap_dss.o
CC aarch64-softmmu/hw/cpu/a15mpcore.o
CC x86_64-softmmu/target/i386/excp_helper.o
CC aarch64-softmmu/hw/display/omap_lcdc.o
CC x86_64-softmmu/target/i386/fpu_helper.o
CC aarch64-softmmu/hw/display/pxa2xx_lcd.o
CC x86_64-softmmu/target/i386/cc_helper.o
CC x86_64-softmmu/target/i386/int_helper.o
CC x86_64-softmmu/target/i386/svm_helper.o
CC aarch64-softmmu/hw/display/bcm2835_fb.o
CC aarch64-softmmu/hw/display/vga.o
CC x86_64-softmmu/target/i386/smm_helper.o
CC aarch64-softmmu/hw/display/virtio-gpu.o
CC aarch64-softmmu/hw/display/virtio-gpu-3d.o
CC aarch64-softmmu/hw/display/virtio-gpu-pci.o
CC x86_64-softmmu/target/i386/misc_helper.o
CC x86_64-softmmu/target/i386/mem_helper.o
CC x86_64-softmmu/target/i386/seg_helper.o
CC x86_64-softmmu/target/i386/mpx_helper.o
CC x86_64-softmmu/target/i386/machine.o
CC x86_64-softmmu/target/i386/gdbstub.o
CC aarch64-softmmu/hw/display/dpcd.o
CC x86_64-softmmu/target/i386/arch_memory_mapping.o
CC aarch64-softmmu/hw/display/xlnx_dp.o
CC x86_64-softmmu/target/i386/arch_dump.o
CC aarch64-softmmu/hw/dma/xlnx_dpdma.o
CC aarch64-softmmu/hw/dma/omap_dma.o
CC x86_64-softmmu/target/i386/monitor.o
CC x86_64-softmmu/target/i386/kvm.o
CC aarch64-softmmu/hw/dma/soc_dma.o
CC aarch64-softmmu/hw/dma/pxa2xx_dma.o
CC aarch64-softmmu/hw/dma/bcm2835_dma.o
CC aarch64-softmmu/hw/gpio/omap_gpio.o
CC aarch64-softmmu/hw/gpio/imx_gpio.o
CC aarch64-softmmu/hw/i2c/omap_i2c.o
CC aarch64-softmmu/hw/gpio/bcm2835_gpio.o
CC aarch64-softmmu/hw/input/pxa2xx_keypad.o
CC x86_64-softmmu/target/i386/hyperv.o
CC aarch64-softmmu/hw/input/tsc210x.o
CC aarch64-softmmu/hw/intc/armv7m_nvic.o
CC aarch64-softmmu/hw/intc/exynos4210_gic.o
CC aarch64-softmmu/hw/intc/exynos4210_combiner.o
CC aarch64-softmmu/hw/intc/omap_intc.o
CC aarch64-softmmu/hw/intc/bcm2835_ic.o
GEN trace/generated-helpers.c
CC x86_64-softmmu/trace/control-target.o
CC aarch64-softmmu/hw/intc/bcm2836_control.o
CC x86_64-softmmu/gdbstub-xml.o
CC aarch64-softmmu/hw/intc/allwinner-a10-pic.o
CC aarch64-softmmu/hw/intc/aspeed_vic.o
CC aarch64-softmmu/hw/intc/arm_gicv3_cpuif.o
CC aarch64-softmmu/hw/misc/ivshmem.o
CC aarch64-softmmu/hw/misc/arm_sysctl.o
CC aarch64-softmmu/hw/misc/cbus.o
CC aarch64-softmmu/hw/misc/exynos4210_pmu.o
CC aarch64-softmmu/hw/misc/exynos4210_clk.o
CC x86_64-softmmu/trace/generated-helpers.o
CC aarch64-softmmu/hw/misc/imx_ccm.o
CC aarch64-softmmu/hw/misc/imx31_ccm.o
CC aarch64-softmmu/hw/misc/imx25_ccm.o
CC aarch64-softmmu/hw/misc/imx6_ccm.o
CC aarch64-softmmu/hw/misc/mst_fpga.o
CC aarch64-softmmu/hw/misc/imx6_src.o
CC aarch64-softmmu/hw/misc/omap_clk.o
CC aarch64-softmmu/hw/misc/omap_gpmc.o
CC aarch64-softmmu/hw/misc/omap_l4.o
CC aarch64-softmmu/hw/misc/omap_sdrc.o
CC aarch64-softmmu/hw/misc/omap_tap.o
CC aarch64-softmmu/hw/misc/bcm2835_mbox.o
LINK x86_64-softmmu/qemu-system-x86_64
CC aarch64-softmmu/hw/misc/bcm2835_property.o
CC aarch64-softmmu/hw/misc/bcm2835_rng.o
CC aarch64-softmmu/hw/misc/zynq_slcr.o
CC aarch64-softmmu/hw/misc/zynq-xadc.o
CC aarch64-softmmu/hw/misc/stm32f2xx_syscfg.o
CC aarch64-softmmu/hw/misc/edu.o
CC aarch64-softmmu/hw/misc/auxbus.o
CC aarch64-softmmu/hw/misc/aspeed_scu.o
CC aarch64-softmmu/hw/misc/aspeed_sdmc.o
CC aarch64-softmmu/hw/net/virtio-net.o
CC aarch64-softmmu/hw/net/vhost_net.o
CC aarch64-softmmu/hw/pcmcia/pxa2xx.o
CC aarch64-softmmu/hw/scsi/virtio-scsi.o
CC aarch64-softmmu/hw/scsi/virtio-scsi-dataplane.o
CC aarch64-softmmu/hw/scsi/vhost-scsi-common.o
CC aarch64-softmmu/hw/scsi/vhost-scsi.o
CC aarch64-softmmu/hw/sd/omap_mmc.o
CC aarch64-softmmu/hw/sd/pxa2xx_mmci.o
CC aarch64-softmmu/hw/sd/bcm2835_sdhost.o
CC aarch64-softmmu/hw/ssi/omap_spi.o
CC aarch64-softmmu/hw/ssi/imx_spi.o
CC aarch64-softmmu/hw/timer/exynos4210_mct.o
CC aarch64-softmmu/hw/timer/exynos4210_pwm.o
CC aarch64-softmmu/hw/timer/exynos4210_rtc.o
CC aarch64-softmmu/hw/timer/omap_gptimer.o
CC aarch64-softmmu/hw/timer/omap_synctimer.o
CC aarch64-softmmu/hw/timer/pxa2xx_timer.o
CC aarch64-softmmu/hw/timer/digic-timer.o
CC aarch64-softmmu/hw/timer/allwinner-a10-pit.o
CC aarch64-softmmu/hw/usb/tusb6010.o
CC aarch64-softmmu/hw/vfio/common.o
CC aarch64-softmmu/hw/vfio/pci.o
CC aarch64-softmmu/hw/vfio/pci-quirks.o
CC aarch64-softmmu/hw/vfio/platform.o
CC aarch64-softmmu/hw/vfio/calxeda-xgmac.o
CC aarch64-softmmu/hw/vfio/amd-xgbe.o
CC aarch64-softmmu/hw/vfio/spapr.o
CC aarch64-softmmu/hw/virtio/virtio.o
CC aarch64-softmmu/hw/virtio/virtio-balloon.o
CC aarch64-softmmu/hw/virtio/vhost.o
CC aarch64-softmmu/hw/virtio/vhost-backend.o
CC aarch64-softmmu/hw/virtio/vhost-vsock.o
CC aarch64-softmmu/hw/virtio/vhost-user.o
CC aarch64-softmmu/hw/virtio/virtio-crypto.o
CC aarch64-softmmu/hw/virtio/virtio-crypto-pci.o
CC aarch64-softmmu/hw/arm/boot.o
CC aarch64-softmmu/hw/arm/collie.o
CC aarch64-softmmu/hw/arm/exynos4_boards.o
CC aarch64-softmmu/hw/arm/gumstix.o
CC aarch64-softmmu/hw/arm/highbank.o
CC aarch64-softmmu/hw/arm/digic_boards.o
CC aarch64-softmmu/hw/arm/integratorcp.o
CC aarch64-softmmu/hw/arm/mainstone.o
CC aarch64-softmmu/hw/arm/musicpal.o
CC aarch64-softmmu/hw/arm/nseries.o
CC aarch64-softmmu/hw/arm/omap_sx1.o
CC aarch64-softmmu/hw/arm/palm.o
CC aarch64-softmmu/hw/arm/realview.o
CC aarch64-softmmu/hw/arm/spitz.o
CC aarch64-softmmu/hw/arm/stellaris.o
CC aarch64-softmmu/hw/arm/tosa.o
CC aarch64-softmmu/hw/arm/versatilepb.o
CC aarch64-softmmu/hw/arm/vexpress.o
CC aarch64-softmmu/hw/arm/virt.o
CC aarch64-softmmu/hw/arm/xilinx_zynq.o
CC aarch64-softmmu/hw/arm/z2.o
CC aarch64-softmmu/hw/arm/virt-acpi-build.o
CC aarch64-softmmu/hw/arm/netduino2.o
CC aarch64-softmmu/hw/arm/sysbus-fdt.o
CC aarch64-softmmu/hw/arm/armv7m.o
CC aarch64-softmmu/hw/arm/exynos4210.o
CC aarch64-softmmu/hw/arm/pxa2xx.o
CC aarch64-softmmu/hw/arm/pxa2xx_gpio.o
CC aarch64-softmmu/hw/arm/pxa2xx_pic.o
CC aarch64-softmmu/hw/arm/digic.o
CC aarch64-softmmu/hw/arm/omap1.o
CC aarch64-softmmu/hw/arm/omap2.o
CC aarch64-softmmu/hw/arm/strongarm.o
CC aarch64-softmmu/hw/arm/allwinner-a10.o
CC aarch64-softmmu/hw/arm/cubieboard.o
CC aarch64-softmmu/hw/arm/bcm2835_peripherals.o
CC aarch64-softmmu/hw/arm/bcm2836.o
CC aarch64-softmmu/hw/arm/raspi.o
CC aarch64-softmmu/hw/arm/stm32f205_soc.o
CC aarch64-softmmu/hw/arm/xlnx-zynqmp.o
CC aarch64-softmmu/hw/arm/xlnx-ep108.o
CC aarch64-softmmu/hw/arm/fsl-imx25.o
CC aarch64-softmmu/hw/arm/imx25_pdk.o
CC aarch64-softmmu/hw/arm/fsl-imx31.o
CC aarch64-softmmu/hw/arm/kzm.o
CC aarch64-softmmu/hw/arm/fsl-imx6.o
CC aarch64-softmmu/hw/arm/sabrelite.o
CC aarch64-softmmu/hw/arm/aspeed_soc.o
CC aarch64-softmmu/hw/arm/aspeed.o
CC aarch64-softmmu/target/arm/arm-semi.o
CC aarch64-softmmu/target/arm/machine.o
CC aarch64-softmmu/target/arm/psci.o
CC aarch64-softmmu/target/arm/arch_dump.o
CC aarch64-softmmu/target/arm/monitor.o
CC aarch64-softmmu/target/arm/kvm-stub.o
CC aarch64-softmmu/target/arm/translate.o
CC aarch64-softmmu/target/arm/helper.o
CC aarch64-softmmu/target/arm/op_helper.o
CC aarch64-softmmu/target/arm/cpu.o
CC aarch64-softmmu/target/arm/neon_helper.o
CC aarch64-softmmu/target/arm/iwmmxt_helper.o
CC aarch64-softmmu/target/arm/gdbstub.o
CC aarch64-softmmu/target/arm/cpu64.o
CC aarch64-softmmu/target/arm/translate-a64.o
CC aarch64-softmmu/target/arm/helper-a64.o
CC aarch64-softmmu/target/arm/gdbstub64.o
CC aarch64-softmmu/target/arm/crypto_helper.o
CC aarch64-softmmu/target/arm/arm-powerctl.o
GEN trace/generated-helpers.c
CC aarch64-softmmu/trace/control-target.o
/tmp/qemu-test/src/target/arm/translate-a64.c: In function ‘handle_shri_with_rndacc’:
/tmp/qemu-test/src/target/arm/translate-a64.c:6365: warning: ‘tcg_src_hi’ may be used uninitialized in this function
/tmp/qemu-test/src/target/arm/translate-a64.c: In function ‘disas_simd_scalar_two_reg_misc’:
/tmp/qemu-test/src/target/arm/translate-a64.c:8092: warning: ‘rmode’ may be used uninitialized in this function
CC aarch64-softmmu/gdbstub-xml.o
CC aarch64-softmmu/trace/generated-helpers.o
LINK aarch64-softmmu/qemu-system-aarch64
LEX convert-dtsv0-lexer.lex.c
make[1]: flex: Command not found
BISON dtc-parser.tab.c
make[1]: bison: Command not found
LEX dtc-lexer.lex.c
make[1]: flex: Command not found
TEST tests/qapi-schema/alternate-any.out
TEST tests/qapi-schema/alternate-array.out
TEST tests/qapi-schema/alternate-clash.out
TEST tests/qapi-schema/alternate-base.out
TEST tests/qapi-schema/alternate-conflict-enum-bool.out
TEST tests/qapi-schema/alternate-conflict-enum-int.out
TEST tests/qapi-schema/alternate-conflict-dict.out
TEST tests/qapi-schema/alternate-conflict-string.out
TEST tests/qapi-schema/alternate-empty.out
TEST tests/qapi-schema/alternate-nested.out
TEST tests/qapi-schema/alternate-unknown.out
TEST tests/qapi-schema/args-alternate.out
TEST tests/qapi-schema/args-any.out
TEST tests/qapi-schema/args-array-empty.out
TEST tests/qapi-schema/args-array-unknown.out
TEST tests/qapi-schema/args-bad-boxed.out
TEST tests/qapi-schema/args-boxed-anon.out
TEST tests/qapi-schema/args-boxed-string.out
TEST tests/qapi-schema/args-boxed-empty.out
TEST tests/qapi-schema/args-int.out
TEST tests/qapi-schema/args-invalid.out
TEST tests/qapi-schema/args-member-array-bad.out
TEST tests/qapi-schema/args-member-case.out
TEST tests/qapi-schema/args-member-unknown.out
TEST tests/qapi-schema/args-name-clash.out
TEST tests/qapi-schema/args-union.out
TEST tests/qapi-schema/args-unknown.out
TEST tests/qapi-schema/bad-base.out
TEST tests/qapi-schema/bad-data.out
TEST tests/qapi-schema/bad-ident.out
TEST tests/qapi-schema/bad-type-bool.out
TEST tests/qapi-schema/bad-type-dict.out
TEST tests/qapi-schema/bad-type-int.out
TEST tests/qapi-schema/base-cycle-direct.out
TEST tests/qapi-schema/base-cycle-indirect.out
TEST tests/qapi-schema/comments.out
TEST tests/qapi-schema/doc-bad-alternate-member.out
TEST tests/qapi-schema/command-int.out
TEST tests/qapi-schema/doc-bad-command-arg.out
TEST tests/qapi-schema/doc-bad-symbol.out
TEST tests/qapi-schema/doc-bad-union-member.out
TEST tests/qapi-schema/doc-before-include.out
TEST tests/qapi-schema/doc-before-pragma.out
TEST tests/qapi-schema/doc-duplicated-arg.out
TEST tests/qapi-schema/doc-duplicated-return.out
TEST tests/qapi-schema/doc-duplicated-since.out
TEST tests/qapi-schema/doc-empty-arg.out
TEST tests/qapi-schema/doc-empty-section.out
TEST tests/qapi-schema/doc-empty-symbol.out
TEST tests/qapi-schema/doc-good.out
TEST tests/qapi-schema/doc-interleaved-section.out
TEST tests/qapi-schema/doc-invalid-end.out
TEST tests/qapi-schema/doc-invalid-end2.out
TEST tests/qapi-schema/doc-invalid-return.out
TEST tests/qapi-schema/doc-invalid-section.out
TEST tests/qapi-schema/doc-missing.out
TEST tests/qapi-schema/doc-invalid-start.out
TEST tests/qapi-schema/doc-missing-colon.out
TEST tests/qapi-schema/doc-missing-expr.out
TEST tests/qapi-schema/doc-missing-space.out
TEST tests/qapi-schema/doc-no-symbol.out
TEST tests/qapi-schema/double-data.out
TEST tests/qapi-schema/double-type.out
TEST tests/qapi-schema/duplicate-key.out
TEST tests/qapi-schema/empty.out
TEST tests/qapi-schema/enum-bad-name.out
TEST tests/qapi-schema/enum-bad-prefix.out
TEST tests/qapi-schema/enum-clash-member.out
TEST tests/qapi-schema/enum-dict-member.out
TEST tests/qapi-schema/enum-int-member.out
TEST tests/qapi-schema/enum-member-case.out
TEST tests/qapi-schema/enum-missing-data.out
TEST tests/qapi-schema/enum-wrong-data.out
TEST tests/qapi-schema/escape-outside-string.out
TEST tests/qapi-schema/escape-too-big.out
TEST tests/qapi-schema/escape-too-short.out
TEST tests/qapi-schema/event-boxed-empty.out
TEST tests/qapi-schema/event-case.out
TEST tests/qapi-schema/event-nest-struct.out
TEST tests/qapi-schema/flat-union-array-branch.out
TEST tests/qapi-schema/flat-union-bad-base.out
TEST tests/qapi-schema/flat-union-bad-discriminator.out
TEST tests/qapi-schema/flat-union-base-any.out
TEST tests/qapi-schema/flat-union-clash-member.out
TEST tests/qapi-schema/flat-union-base-union.out
TEST tests/qapi-schema/flat-union-empty.out
TEST tests/qapi-schema/flat-union-incomplete-branch.out
TEST tests/qapi-schema/flat-union-inline.out
TEST tests/qapi-schema/flat-union-int-branch.out
TEST tests/qapi-schema/flat-union-invalid-branch-key.out
TEST tests/qapi-schema/flat-union-invalid-discriminator.out
TEST tests/qapi-schema/flat-union-no-base.out
TEST tests/qapi-schema/flat-union-optional-discriminator.out
TEST tests/qapi-schema/flat-union-string-discriminator.out
TEST tests/qapi-schema/funny-char.out
TEST tests/qapi-schema/ident-with-escape.out
TEST tests/qapi-schema/include-before-err.out
TEST tests/qapi-schema/include-cycle.out
TEST tests/qapi-schema/include-extra-junk.out
TEST tests/qapi-schema/include-format-err.out
TEST tests/qapi-schema/include-nested-err.out
TEST tests/qapi-schema/include-no-file.out
TEST tests/qapi-schema/include-non-file.out
TEST tests/qapi-schema/include-relpath.out
TEST tests/qapi-schema/include-repetition.out
TEST tests/qapi-schema/include-self-cycle.out
TEST tests/qapi-schema/include-simple.out
TEST tests/qapi-schema/indented-expr.out
TEST tests/qapi-schema/leading-comma-list.out
TEST tests/qapi-schema/leading-comma-object.out
TEST tests/qapi-schema/missing-colon.out
TEST tests/qapi-schema/missing-comma-list.out
TEST tests/qapi-schema/missing-comma-object.out
TEST tests/qapi-schema/missing-type.out
TEST tests/qapi-schema/nested-struct-data.out
TEST tests/qapi-schema/non-objects.out
TEST tests/qapi-schema/pragma-doc-required-crap.out
TEST tests/qapi-schema/pragma-extra-junk.out
TEST tests/qapi-schema/pragma-name-case-whitelist-crap.out
TEST tests/qapi-schema/pragma-non-dict.out
TEST tests/qapi-schema/pragma-returns-whitelist-crap.out
TEST tests/qapi-schema/qapi-schema-test.out
TEST tests/qapi-schema/quoted-structural-chars.out
TEST tests/qapi-schema/redefined-builtin.out
TEST tests/qapi-schema/redefined-command.out
TEST tests/qapi-schema/redefined-event.out
TEST tests/qapi-schema/redefined-type.out
TEST tests/qapi-schema/reserved-command-q.out
TEST tests/qapi-schema/reserved-member-has.out
TEST tests/qapi-schema/reserved-enum-q.out
TEST tests/qapi-schema/reserved-member-q.out
TEST tests/qapi-schema/reserved-member-u.out
TEST tests/qapi-schema/reserved-member-underscore.out
TEST tests/qapi-schema/reserved-type-kind.out
TEST tests/qapi-schema/reserved-type-list.out
TEST tests/qapi-schema/returns-alternate.out
TEST tests/qapi-schema/returns-array-bad.out
TEST tests/qapi-schema/returns-dict.out
TEST tests/qapi-schema/returns-unknown.out
TEST tests/qapi-schema/struct-base-clash.out
TEST tests/qapi-schema/struct-base-clash-deep.out
TEST tests/qapi-schema/returns-whitelist.out
TEST tests/qapi-schema/struct-data-invalid.out
TEST tests/qapi-schema/struct-member-invalid.out
TEST tests/qapi-schema/trailing-comma-list.out
TEST tests/qapi-schema/trailing-comma-object.out
TEST tests/qapi-schema/type-bypass-bad-gen.out
TEST tests/qapi-schema/unclosed-list.out
TEST tests/qapi-schema/unclosed-object.out
TEST tests/qapi-schema/unclosed-string.out
TEST tests/qapi-schema/unicode-str.out
TEST tests/qapi-schema/union-base-empty.out
TEST tests/qapi-schema/union-base-no-discriminator.out
TEST tests/qapi-schema/union-branch-case.out
TEST tests/qapi-schema/union-clash-branches.out
TEST tests/qapi-schema/union-empty.out
TEST tests/qapi-schema/union-invalid-base.out
TEST tests/qapi-schema/union-optional-branch.out
TEST tests/qapi-schema/union-unknown.out
TEST tests/qapi-schema/unknown-escape.out
TEST tests/qapi-schema/unknown-expr-key.out
GEN tests/qapi-schema/doc-good.test.texi
CC tests/check-qdict.o
CC tests/test-char.o
CC tests/check-qint.o
CC tests/check-qfloat.o
CC tests/check-qstring.o
CC tests/check-qlist.o
CC tests/check-qnull.o
CC tests/check-qjson.o
CC tests/test-qobject-output-visitor.o
GEN tests/test-qapi-visit.c
GEN tests/test-qapi-types.c
GEN tests/test-qapi-event.c
GEN tests/test-qmp-introspect.c
CC tests/test-clone-visitor.o
CC tests/test-qobject-input-visitor.o
CC tests/test-qmp-commands.o
GEN tests/test-qmp-marshal.c
CC tests/test-string-output-visitor.o
CC tests/test-string-input-visitor.o
CC tests/test-qmp-event.o
CC tests/test-opts-visitor.o
CC tests/test-coroutine.o
CC tests/iothread.o
CC tests/test-visitor-serialization.o
CC tests/test-iov.o
CC tests/test-aio-multithread.o
CC tests/test-aio.o
CC tests/test-throttle.o
CC tests/test-hbitmap.o
CC tests/test-thread-pool.o
CC tests/test-blockjob.o
CC tests/test-blockjob-txn.o
CC tests/test-x86-cpuid.o
CC tests/test-xbzrle.o
CC tests/test-vmstate.o
CC tests/test-cutils.o
CC tests/test-shift128.o
CC tests/test-mul64.o
CC tests/test-int128.o
CC tests/rcutorture.o
CC tests/test-rcu-list.o
/tmp/qemu-test/src/tests/test-int128.c:180: warning: ‘__noclone__’ attribute directive ignored
CC tests/test-qdist.o
CC tests/test-qht.o
CC tests/test-qht-par.o
CC tests/qht-bench.o
CC tests/test-bitops.o
CC tests/test-bitcnt.o
CC tests/check-qom-interface.o
CC tests/check-qom-proplist.o
CC tests/test-qemu-opts.o
CC tests/test-keyval.o
CC tests/test-write-threshold.o
CC tests/test-crypto-hash.o
CC tests/test-crypto-hmac.o
CC tests/test-crypto-cipher.o
CC tests/test-crypto-secret.o
CC tests/test-qga.o
CC tests/libqtest.o
CC tests/test-timed-average.o
CC tests/test-io-task.o
CC tests/test-io-channel-socket.o
CC tests/io-channel-helpers.o
CC tests/test-io-channel-file.o
CC tests/test-io-channel-command.o
CC tests/test-io-channel-buffer.o
CC tests/test-base64.o
CC tests/test-crypto-ivgen.o
CC tests/test-crypto-afsplit.o
CC tests/test-crypto-xts.o
CC tests/test-crypto-block.o
CC tests/test-logging.o
CC tests/test-replication.o
CC tests/test-bufferiszero.o
CC tests/test-uuid.o
CC tests/ptimer-test.o
CC tests/ptimer-test-stubs.o
CC tests/test-qapi-util.o
CC tests/vhost-user-test.o
CC tests/libqos/pci.o
CC tests/libqos/fw_cfg.o
CC tests/libqos/malloc.o
CC tests/libqos/i2c.o
CC tests/libqos/libqos.o
CC tests/libqos/malloc-spapr.o
CC tests/libqos/libqos-spapr.o
CC tests/libqos/rtas.o
CC tests/libqos/pci-spapr.o
CC tests/libqos/pci-pc.o
CC tests/libqos/malloc-pc.o
CC tests/libqos/libqos-pc.o
CC tests/libqos/ahci.o
CC tests/libqos/virtio.o
CC tests/libqos/virtio-pci.o
CC tests/libqos/virtio-mmio.o
CC tests/libqos/malloc-generic.o
CC tests/endianness-test.o
CC tests/fdc-test.o
CC tests/ahci-test.o
CC tests/ide-test.o
CC tests/hd-geo-test.o
/tmp/qemu-test/src/tests/ide-test.c: In function ‘cdrom_pio_impl’:
/tmp/qemu-test/src/tests/ide-test.c:803: warning: ignoring return value of ‘fwrite’, declared with attribute warn_unused_result
/tmp/qemu-test/src/tests/ide-test.c: In function ‘test_cdrom_dma’:
/tmp/qemu-test/src/tests/ide-test.c:899: warning: ignoring return value of ‘fwrite’, declared with attribute warn_unused_result
CC tests/boot-order-test.o
CC tests/bios-tables-test.o
CC tests/boot-sector.o
CC tests/acpi-utils.o
CC tests/boot-serial-test.o
CC tests/pxe-test.o
CC tests/rtc-test.o
CC tests/ipmi-kcs-test.o
CC tests/ipmi-bt-test.o
CC tests/i440fx-test.o
CC tests/fw_cfg-test.o
CC tests/drive_del-test.o
CC tests/wdt_ib700-test.o
CC tests/tco-test.o
CC tests/e1000-test.o
CC tests/e1000e-test.o
CC tests/rtl8139-test.o
CC tests/pcnet-test.o
CC tests/eepro100-test.o
CC tests/ne2000-test.o
CC tests/nvme-test.o
CC tests/ac97-test.o
CC tests/es1370-test.o
CC tests/virtio-net-test.o
CC tests/virtio-balloon-test.o
CC tests/virtio-blk-test.o
CC tests/virtio-rng-test.o
CC tests/virtio-scsi-test.o
CC tests/virtio-serial-test.o
CC tests/virtio-console-test.o
CC tests/tpci200-test.o
CC tests/ipoctal232-test.o
CC tests/display-vga-test.o
CC tests/intel-hda-test.o
CC tests/ivshmem-test.o
CC tests/vmxnet3-test.o
CC tests/pvpanic-test.o
CC tests/i82801b11-test.o
CC tests/ioh3420-test.o
CC tests/usb-hcd-ohci-test.o
CC tests/libqos/usb.o
CC tests/usb-hcd-uhci-test.o
CC tests/usb-hcd-ehci-test.o
CC tests/usb-hcd-xhci-test.o
CC tests/pc-cpu-test.o
CC tests/q35-test.o
CC tests/test-netfilter.o
CC tests/test-filter-mirror.o
CC tests/test-filter-redirector.o
CC tests/postcopy-test.o
CC tests/test-x86-cpuid-compat.o
CC tests/numa-test.o
CC tests/qmp-test.o
CC tests/device-introspect-test.o
CC tests/qom-test.o
CC tests/test-hmp.o
LINK tests/check-qdict
LINK tests/test-char
LINK tests/check-qfloat
LINK tests/check-qint
LINK tests/check-qstring
LINK tests/check-qlist
LINK tests/check-qnull
CC tests/test-qapi-visit.o
LINK tests/check-qjson
CC tests/test-qapi-event.o
CC tests/test-qmp-introspect.o
CC tests/test-qmp-marshal.o
CC tests/test-qapi-types.o
LINK tests/test-coroutine
LINK tests/test-iov
LINK tests/test-aio
LINK tests/test-aio-multithread
LINK tests/test-throttle
LINK tests/test-thread-pool
LINK tests/test-hbitmap
LINK tests/test-blockjob
LINK tests/test-x86-cpuid
LINK tests/test-blockjob-txn
LINK tests/test-xbzrle
LINK tests/test-vmstate
LINK tests/test-cutils
LINK tests/test-shift128
LINK tests/test-mul64
LINK tests/test-int128
LINK tests/rcutorture
LINK tests/test-rcu-list
LINK tests/test-qdist
LINK tests/test-qht
LINK tests/qht-bench
LINK tests/test-bitops
LINK tests/test-bitcnt
LINK tests/check-qom-interface
LINK tests/check-qom-proplist
LINK tests/test-qemu-opts
LINK tests/test-keyval
LINK tests/test-write-threshold
LINK tests/test-crypto-hash
LINK tests/test-crypto-hmac
LINK tests/test-crypto-cipher
LINK tests/test-crypto-secret
LINK tests/test-qga
LINK tests/test-timed-average
LINK tests/test-io-task
LINK tests/test-io-channel-socket
LINK tests/test-io-channel-file
LINK tests/test-io-channel-command
LINK tests/test-io-channel-buffer
LINK tests/test-base64
LINK tests/test-crypto-ivgen
LINK tests/test-crypto-afsplit
LINK tests/test-crypto-xts
LINK tests/test-crypto-block
LINK tests/test-logging
LINK tests/test-replication
LINK tests/test-bufferiszero
LINK tests/test-uuid
LINK tests/ptimer-test
LINK tests/test-qapi-util
LINK tests/vhost-user-test
LINK tests/endianness-test
LINK tests/fdc-test
LINK tests/ide-test
LINK tests/ahci-test
LINK tests/hd-geo-test
LINK tests/boot-order-test
LINK tests/bios-tables-test
LINK tests/boot-serial-test
LINK tests/pxe-test
LINK tests/rtc-test
LINK tests/ipmi-kcs-test
LINK tests/ipmi-bt-test
LINK tests/i440fx-test
LINK tests/fw_cfg-test
LINK tests/drive_del-test
LINK tests/wdt_ib700-test
LINK tests/tco-test
LINK tests/e1000-test
LINK tests/e1000e-test
LINK tests/rtl8139-test
LINK tests/pcnet-test
LINK tests/eepro100-test
LINK tests/ne2000-test
LINK tests/nvme-test
LINK tests/ac97-test
LINK tests/es1370-test
LINK tests/virtio-net-test
LINK tests/virtio-balloon-test
LINK tests/virtio-blk-test
LINK tests/virtio-rng-test
LINK tests/virtio-scsi-test
LINK tests/virtio-serial-test
LINK tests/virtio-console-test
LINK tests/tpci200-test
LINK tests/ipoctal232-test
LINK tests/display-vga-test
LINK tests/intel-hda-test
LINK tests/ivshmem-test
LINK tests/vmxnet3-test
LINK tests/pvpanic-test
LINK tests/i82801b11-test
LINK tests/ioh3420-test
LINK tests/usb-hcd-ohci-test
LINK tests/usb-hcd-uhci-test
LINK tests/usb-hcd-ehci-test
LINK tests/usb-hcd-xhci-test
LINK tests/pc-cpu-test
LINK tests/q35-test
LINK tests/test-netfilter
LINK tests/test-filter-mirror
LINK tests/test-filter-redirector
LINK tests/postcopy-test
LINK tests/test-x86-cpuid-compat
LINK tests/numa-test
LINK tests/qmp-test
LINK tests/device-introspect-test
LINK tests/qom-test
LINK tests/test-hmp
GTESTER tests/test-char
GTESTER tests/check-qfloat
GTESTER tests/check-qint
GTESTER tests/check-qdict
GTESTER tests/check-qstring
GTESTER tests/check-qlist
GTESTER tests/check-qnull
GTESTER tests/check-qjson
LINK tests/test-qobject-output-visitor
LINK tests/test-clone-visitor
LINK tests/test-qobject-input-visitor
LINK tests/test-qmp-commands
LINK tests/test-string-input-visitor
LINK tests/test-string-output-visitor
LINK tests/test-qmp-event
LINK tests/test-opts-visitor
GTESTER tests/test-coroutine
GTESTER tests/test-aio-multithread
GTESTER tests/test-throttle
GTESTER tests/test-thread-pool
GTESTER tests/test-iov
LINK tests/test-visitor-serialization
GTESTER tests/test-aio
GTESTER tests/test-hbitmap
GTESTER tests/test-blockjob
GTESTER tests/test-blockjob-txn
GTESTER tests/test-x86-cpuid
GTESTER tests/test-xbzrle
GTESTER tests/test-vmstate
Failed to load simple/primitive:b_1
Failed to load simple/primitive:i64_2
Failed to load simple/primitive:i32_1
Failed to load simple/primitive:i32_1
Failed to load test/with_tmp:a
Failed to load test/tmp_child_parent:f
Failed to load test/tmp_child:parent
Failed to load test/with_tmp:tmp
Failed to load test/tmp_child:diff
Failed to load test/with_tmp:tmp
Failed to load test/tmp_child:diff
Failed to load test/with_tmp:tmp
GTESTER tests/test-cutils
GTESTER tests/test-shift128
GTESTER tests/test-mul64
GTESTER tests/test-int128
GTESTER tests/rcutorture
GTESTER tests/test-rcu-list
GTESTER tests/test-qdist
GTESTER tests/test-qht
LINK tests/test-qht-par
GTESTER tests/test-bitops
GTESTER tests/test-bitcnt
GTESTER tests/check-qom-interface
GTESTER tests/check-qom-proplist
GTESTER tests/test-qemu-opts
GTESTER tests/test-keyval
GTESTER tests/test-write-threshold
GTESTER tests/test-crypto-hash
GTESTER tests/test-crypto-hmac
GTESTER tests/test-crypto-cipher
GTESTER tests/test-crypto-secret
GTESTER tests/test-qga
GTESTER tests/test-timed-average
GTESTER tests/test-io-task
GTESTER tests/test-io-channel-socket
GTESTER tests/test-io-channel-file
GTESTER tests/test-io-channel-command
GTESTER tests/test-io-channel-buffer
GTESTER tests/test-base64
GTESTER tests/test-crypto-ivgen
GTESTER tests/test-crypto-afsplit
GTESTER tests/test-crypto-xts
GTESTER tests/test-crypto-block
GTESTER tests/test-logging
GTESTER tests/test-replication
GTESTER tests/test-bufferiszero
GTESTER tests/test-uuid
GTESTER tests/ptimer-test
GTESTER tests/test-qapi-util
GTESTER check-qtest-x86_64
GTESTER check-qtest-aarch64
GTESTER tests/test-qobject-output-visitor
GTESTER tests/test-clone-visitor
GTESTER tests/test-qobject-input-visitor
GTESTER tests/test-qmp-commands
GTESTER tests/test-string-input-visitor
GTESTER tests/test-string-output-visitor
GTESTER tests/test-qmp-event
GTESTER tests/test-opts-visitor
GTESTER tests/test-visitor-serialization
GTESTER tests/test-qht-par
**
ERROR:/tmp/qemu-test/src/tests/test-qga.c:894:test_qga_guest_exec: assertion failed: (exited)
GTester: last random seed: R02Sae5ce4b19db6d4ed795d2a2e39ff7843
make: *** [check-tests/test-qga] Error 1
make: *** Waiting for unfinished jobs....
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
Back to tcg accelerator.
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
Back to tcg accelerator.
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
Back to tcg accelerator.
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
Back to tcg accelerator.
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
Back to tcg accelerator.
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
Back to tcg accelerator.
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
Back to tcg accelerator.
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
Back to tcg accelerator.
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
Back to tcg accelerator.
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
Back to tcg accelerator.
tests/docker/Makefile.include:118: recipe for target 'docker-run' failed
make[1]: *** [docker-run] Error 2
make[1]: Leaving directory '/var/tmp/patchew-tester-tmp-34mc_apg/src'
tests/docker/Makefile.include:149: recipe for target 'docker-run-test-quick@centos6' failed
make: *** [docker-run-test-quick@centos6] Error 2
=== OUTPUT END ===
Test command exited with code: 2
---
Email generated automatically by Patchew [http://patchew.org/].
Please send your feedback to patchew-devel@freelists.org
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 18/19] block: split BlockAcctStats creation and setup
2017-06-05 12:39 ` [Qemu-devel] [PATCH 18/19] block: split BlockAcctStats creation and setup Paolo Bonzini
@ 2017-06-06 15:43 ` Alberto Garcia
0 siblings, 0 replies; 42+ messages in thread
From: Alberto Garcia @ 2017-06-06 15:43 UTC (permalink / raw)
To: Paolo Bonzini, qemu-devel; +Cc: famz
On Mon 05 Jun 2017 02:39:07 PM CEST, Paolo Bonzini wrote:
> block_acct_destroy is called unconditionally in blk_delete, but there is
> no BlockAcctStats function that is called unconditionally in blk_new.
> Split block_acct_init in two, so that it will be possible to create a
> QemuMutex in block_acct_init and destroy it in block_acct_cleanup.
>
> Cc: Alberto Garcia <berto@igalia.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Berto
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 19/19] block: make accounting thread-safe
2017-06-05 12:39 ` [Qemu-devel] [PATCH 19/19] block: make accounting thread-safe Paolo Bonzini
@ 2017-06-06 15:45 ` Alberto Garcia
2018-05-24 13:35 ` Alberto Garcia
1 sibling, 0 replies; 42+ messages in thread
From: Alberto Garcia @ 2017-06-06 15:45 UTC (permalink / raw)
To: Paolo Bonzini, qemu-devel; +Cc: famz
On Mon 05 Jun 2017 02:39:08 PM CEST, Paolo Bonzini wrote:
> I'm not trying too hard yet. Later, with multiqueue support,
> this may cause mutex contention or cacheline bouncing.
>
> Cc: Alberto Garcia <berto@igalia.com>
> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
Reviewed-by: Alberto Garcia <berto@igalia.com>
Berto
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
` (19 preceding siblings ...)
2017-06-05 13:18 ` [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 no-reply
@ 2017-06-07 0:04 ` Fam Zheng
20 siblings, 0 replies; 42+ messages in thread
From: Fam Zheng @ 2017-06-07 0:04 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: qemu-devel
On Mon, 06/05 14:38, Paolo Bonzini wrote:
> v3->v4: rebased and included fixes in Fam's v2 pull request
> new patch 18, fixing testsuite failures on OS X
Queued, thanks.
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-05 12:39 ` [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex Paolo Bonzini
@ 2017-06-26 16:07 ` Vladimir Sementsov-Ogievskiy
2017-06-26 16:54 ` Paolo Bonzini
0 siblings, 1 reply; 42+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2017-06-26 16:07 UTC (permalink / raw)
To: Paolo Bonzini, qemu-devel; +Cc: famz
HI!
One question here, should not 'bdrv_undo_clear_dirty_bitmap' be under
lock too?
05.06.2017 15:39, Paolo Bonzini wrote:
> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
> block/dirty-bitmap.c | 68 ++++++++++++++++++++++++++++++++++++++------
> block/mirror.c | 11 +++++--
> include/block/block_int.h | 4 +--
> include/block/dirty-bitmap.h | 25 +++++++++++-----
> migration/block.c | 10 ++++---
> 5 files changed, 94 insertions(+), 24 deletions(-)
--
Best regards,
Vladimir
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-26 16:07 ` Vladimir Sementsov-Ogievskiy
@ 2017-06-26 16:54 ` Paolo Bonzini
2017-06-27 9:07 ` Vladimir Sementsov-Ogievskiy
0 siblings, 1 reply; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-26 16:54 UTC (permalink / raw)
To: Vladimir Sementsov-Ogievskiy, qemu-devel; +Cc: famz
On 26/06/2017 18:07, Vladimir Sementsov-Ogievskiy wrote:
> HI!
>
> One question here, should not 'bdrv_undo_clear_dirty_bitmap' be under
> lock too?
Any call to dirty bitmap functions between bdrv_clear_dirty_bitmap and
bdrv_undo_clear_dirty_bitmap is problematic anyway, so
bdrv_clear_dirty_bitmap really only needs the lock in the !out case;
bdrv_undo_clear_dirty_bitmap is only called when out != NULL.
However, I agree it would be cleaner to add the lock there, too.
Paolo
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-26 16:54 ` Paolo Bonzini
@ 2017-06-27 9:07 ` Vladimir Sementsov-Ogievskiy
2017-06-27 9:27 ` Paolo Bonzini
0 siblings, 1 reply; 42+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2017-06-27 9:07 UTC (permalink / raw)
To: Paolo Bonzini, qemu-devel; +Cc: famz
26.06.2017 19:54, Paolo Bonzini wrote:
>
> On 26/06/2017 18:07, Vladimir Sementsov-Ogievskiy wrote:
>> HI!
>>
>> One question here, should not 'bdrv_undo_clear_dirty_bitmap' be under
>> lock too?
> Any call to dirty bitmap functions between bdrv_clear_dirty_bitmap and
> bdrv_undo_clear_dirty_bitmap is problematic anyway, so
> bdrv_clear_dirty_bitmap really only needs the lock in the !out case;
> bdrv_undo_clear_dirty_bitmap is only called when out != NULL.
>
> However, I agree it would be cleaner to add the lock there, too.
>
> Paolo
Also, you've added comment "Called with BQL taken" both to functions
that calls bdrv_dirty_bitmaps_lock and that do not... What is BQL?
--
Best regards,
Vladimir
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-27 9:07 ` Vladimir Sementsov-Ogievskiy
@ 2017-06-27 9:27 ` Paolo Bonzini
2017-06-27 9:47 ` Vladimir Sementsov-Ogievskiy
0 siblings, 1 reply; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-27 9:27 UTC (permalink / raw)
To: Vladimir Sementsov-Ogievskiy, qemu-devel; +Cc: famz
On 27/06/2017 11:07, Vladimir Sementsov-Ogievskiy wrote:
> 26.06.2017 19:54, Paolo Bonzini wrote:
>>
>> On 26/06/2017 18:07, Vladimir Sementsov-Ogievskiy wrote:
>>> HI!
>>>
>>> One question here, should not 'bdrv_undo_clear_dirty_bitmap' be under
>>> lock too?
>> Any call to dirty bitmap functions between bdrv_clear_dirty_bitmap and
>> bdrv_undo_clear_dirty_bitmap is problematic anyway, so
>> bdrv_clear_dirty_bitmap really only needs the lock in the !out case;
>> bdrv_undo_clear_dirty_bitmap is only called when out != NULL.
>>
>> However, I agree it would be cleaner to add the lock there, too.
>
> Also, you've added comment "Called with BQL taken" both to functions
> that calls bdrv_dirty_bitmaps_lock and that do not... What is BQL?
It's the "big QEMU lock", also known as "iothread lock". The locking policy
is documented in block_int.h:
/* Writing to the list requires the BQL _and_ the dirty_bitmap_mutex.
* Reading from the list can be done with either the BQL or the
* dirty_bitmap_mutex. Modifying a bitmap only requires
* dirty_bitmap_mutex. */
QemuMutex dirty_bitmap_mutex;
QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps;
and the comments in block/dirty-bitmap.c reflect the above comment.
Paolo
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-27 9:27 ` Paolo Bonzini
@ 2017-06-27 9:47 ` Vladimir Sementsov-Ogievskiy
2017-06-27 12:52 ` Paolo Bonzini
0 siblings, 1 reply; 42+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2017-06-27 9:47 UTC (permalink / raw)
To: Paolo Bonzini, qemu-devel; +Cc: famz
27.06.2017 12:27, Paolo Bonzini wrote:
>
> On 27/06/2017 11:07, Vladimir Sementsov-Ogievskiy wrote:
>> 26.06.2017 19:54, Paolo Bonzini wrote:
>>> On 26/06/2017 18:07, Vladimir Sementsov-Ogievskiy wrote:
>>>> HI!
>>>>
>>>> One question here, should not 'bdrv_undo_clear_dirty_bitmap' be under
>>>> lock too?
>>> Any call to dirty bitmap functions between bdrv_clear_dirty_bitmap and
>>> bdrv_undo_clear_dirty_bitmap is problematic anyway, so
>>> bdrv_clear_dirty_bitmap really only needs the lock in the !out case;
>>> bdrv_undo_clear_dirty_bitmap is only called when out != NULL.
>>>
>>> However, I agree it would be cleaner to add the lock there, too.
>> Also, you've added comment "Called with BQL taken" both to functions
>> that calls bdrv_dirty_bitmaps_lock and that do not... What is BQL?
> It's the "big QEMU lock", also known as "iothread lock". The locking policy
> is documented in block_int.h:
>
> /* Writing to the list requires the BQL _and_ the dirty_bitmap_mutex.
> * Reading from the list can be done with either the BQL or the
> * dirty_bitmap_mutex. Modifying a bitmap only requires
> * dirty_bitmap_mutex. */
> QemuMutex dirty_bitmap_mutex;
> QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps;
>
> and the comments in block/dirty-bitmap.c reflect the above comment.
>
> Paolo
bdrv_enable_dirty_bitmap - writes to the list, it changes 'disabled'
field. So it requires both BQL and dirty_bitmap_mutex? But the comment
says only about BQL.
Also, for example, if I want to create a new bitmap and than somehow
change it, should I do it like this:
bdrv_create_dirty_bitmap(...)
bdrv_dirty_bitmaps_lock(bs)
bitmap = bdrv_find_dirty_bitmap(bs, name)
<some changes>
bdrv_dirty_bitmaps_unlock(bs)
- because we can't now trust the pointer returned by
bdrv_create_dirty_bitmap, as it releases bitmap lock before return.
--
Best regards,
Vladimir
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-27 9:47 ` Vladimir Sementsov-Ogievskiy
@ 2017-06-27 12:52 ` Paolo Bonzini
2017-06-27 13:51 ` Vladimir Sementsov-Ogievskiy
0 siblings, 1 reply; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-27 12:52 UTC (permalink / raw)
To: Vladimir Sementsov-Ogievskiy, qemu-devel; +Cc: famz
On 27/06/2017 11:47, Vladimir Sementsov-Ogievskiy wrote:
> bdrv_enable_dirty_bitmap - writes to the list, it changes 'disabled'
> field. So it requires both BQL and dirty_bitmap_mutex? But the comment
> says only about BQL.
This one is interesting. There could be a concurrent call to
bdrv_set_dirty, indeed. I'll send a patch.
> Also, for example, if I want to create a new bitmap and than somehow
> change it, should I do it like this:
>
> bdrv_create_dirty_bitmap(...)
>
> bdrv_dirty_bitmaps_lock(bs)
>
> bitmap = bdrv_find_dirty_bitmap(bs, name)
>
> <some changes>
>
> bdrv_dirty_bitmaps_unlock(bs)
>
> - because we can't now trust the pointer returned by
> bdrv_create_dirty_bitmap, as it releases bitmap lock before return.
If you have the big QEMU lock (you do if you are in the QEMU monitor),
you are protected from changes to the list of bitmaps.
Paolo
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-27 12:52 ` Paolo Bonzini
@ 2017-06-27 13:51 ` Vladimir Sementsov-Ogievskiy
2017-06-27 13:58 ` Paolo Bonzini
0 siblings, 1 reply; 42+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2017-06-27 13:51 UTC (permalink / raw)
To: Paolo Bonzini, qemu-devel; +Cc: famz
27.06.2017 15:52, Paolo Bonzini wrote:
>
> On 27/06/2017 11:47, Vladimir Sementsov-Ogievskiy wrote:
>> bdrv_enable_dirty_bitmap - writes to the list, it changes 'disabled'
>> field. So it requires both BQL and dirty_bitmap_mutex? But the comment
>> says only about BQL.
> This one is interesting. There could be a concurrent call to
> bdrv_set_dirty, indeed. I'll send a patch.
>
>> Also, for example, if I want to create a new bitmap and than somehow
>> change it, should I do it like this:
>>
>> bdrv_create_dirty_bitmap(...)
>>
>> bdrv_dirty_bitmaps_lock(bs)
>>
>> bitmap = bdrv_find_dirty_bitmap(bs, name)
>>
>> <some changes>
>>
>> bdrv_dirty_bitmaps_unlock(bs)
>>
>> - because we can't now trust the pointer returned by
>> bdrv_create_dirty_bitmap, as it releases bitmap lock before return.
> If you have the big QEMU lock (you do if you are in the QEMU monitor),
> you are protected from changes to the list of bitmaps.
>
> Paolo
but you wrote "Writing to the list requires the BQL _and_ the
dirty_bitmap_mutex".
should it be BQL only?
--
Best regards,
Vladimir
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-27 13:51 ` Vladimir Sementsov-Ogievskiy
@ 2017-06-27 13:58 ` Paolo Bonzini
2017-06-27 14:20 ` Vladimir Sementsov-Ogievskiy
0 siblings, 1 reply; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-27 13:58 UTC (permalink / raw)
To: Vladimir Sementsov-Ogievskiy, qemu-devel; +Cc: famz
On 27/06/2017 15:51, Vladimir Sementsov-Ogievskiy wrote:
>>>
>>> bdrv_create_dirty_bitmap(...)
>>>
>>> bdrv_dirty_bitmaps_lock(bs)
>>>
>>> bitmap = bdrv_find_dirty_bitmap(bs, name)
>>>
>>> <some changes>
>>>
>>> bdrv_dirty_bitmaps_unlock(bs)
>>>
>>> - because we can't now trust the pointer returned by
>>> bdrv_create_dirty_bitmap, as it releases bitmap lock before return.
>> If you have the big QEMU lock (you do if you are in the QEMU monitor),
>> you are protected from changes to the list of bitmaps.
>>
>> Paolo
>
> but you wrote "Writing to the list requires the BQL _and_ the
> dirty_bitmap_mutex".
>
> should it be BQL only?
bdrv_dirty_bitmaps_lock/unlock is (should be) called by the functions
that write to the list. I hope I can post the patch today already.
Paolo
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-27 13:58 ` Paolo Bonzini
@ 2017-06-27 14:20 ` Vladimir Sementsov-Ogievskiy
2017-06-27 14:26 ` Paolo Bonzini
0 siblings, 1 reply; 42+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2017-06-27 14:20 UTC (permalink / raw)
To: Paolo Bonzini, qemu-devel; +Cc: famz
27.06.2017 16:58, Paolo Bonzini wrote:
>
> On 27/06/2017 15:51, Vladimir Sementsov-Ogievskiy wrote:
>>>> bdrv_create_dirty_bitmap(...)
>>>>
>>>> bdrv_dirty_bitmaps_lock(bs)
>>>>
>>>> bitmap = bdrv_find_dirty_bitmap(bs, name)
>>>>
>>>> <some changes>
>>>>
>>>> bdrv_dirty_bitmaps_unlock(bs)
>>>>
>>>> - because we can't now trust the pointer returned by
>>>> bdrv_create_dirty_bitmap, as it releases bitmap lock before return.
>>> If you have the big QEMU lock (you do if you are in the QEMU monitor),
>>> you are protected from changes to the list of bitmaps.
>>>
>>> Paolo
>> but you wrote "Writing to the list requires the BQL _and_ the
>> dirty_bitmap_mutex".
>>
>> should it be BQL only?
> bdrv_dirty_bitmaps_lock/unlock is (should be) called by the functions
> that write to the list. I hope I can post the patch today already.
>
> Paolo
I'm likely not right, but for me introducing this mutex looks like dirty
bitmaps may be accessed from concurrent threads. So for me it looks
strange that only accessors are protected by the mutex and not the whole
transactions.
One example I've wrote above, other examples from code: are
qmp_block_dirty_bitmap** functions:
bdrv_create_dirty_bitmap() {
bdrv_find_dirty_bitmap()
....
bdrv_dirty_bitmaps_lock(bs);
QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list);
bdrv_dirty_bitmaps_unlock(bs);
}
- we protect inserting into list from other threads, but what prevent
creating bitmap with the same name from other thread after
bdrv_find_dirty_bitmap() and before bdrv_dirty_bitmaps_lock() ?
-----
qmp_block_dirty_bitmap_clear() {
bitmap = block_dirty_bitmap_lookup()
....
bdrv_clear_dirty_bitmap()
}
- bdrv_clear_dirty_bitmap is protected by lock, but what prevent
deleting this bitmap by other thread between block_dirty_bitmap_lookup()
and bdrv_clear_dirty_bitmap() ?
--- it is not the whole list ---
--
Best regards,
Vladimir
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-27 14:20 ` Vladimir Sementsov-Ogievskiy
@ 2017-06-27 14:26 ` Paolo Bonzini
2017-06-27 14:43 ` Vladimir Sementsov-Ogievskiy
2017-06-27 15:31 ` Vladimir Sementsov-Ogievskiy
0 siblings, 2 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-27 14:26 UTC (permalink / raw)
To: Vladimir Sementsov-Ogievskiy, qemu-devel; +Cc: famz
On 27/06/2017 16:20, Vladimir Sementsov-Ogievskiy wrote:
> I'm likely not right, but for me introducing this mutex looks like dirty
> bitmaps may be accessed from concurrent threads. So for me it looks
> strange that only accessors are protected by the mutex and not the whole
> transactions.
There must be something else protecting the whole transaction.
> One example I've wrote above, other examples from code: are
> qmp_block_dirty_bitmap** functions:
>
> bdrv_create_dirty_bitmap() {
>
> bdrv_find_dirty_bitmap()
>
> ....
>
> bdrv_dirty_bitmaps_lock(bs);
> QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list);
> bdrv_dirty_bitmaps_unlock(bs);
>
> }
>
> - we protect inserting into list from other threads, but what prevent
> creating bitmap with the same name from other thread after
> bdrv_find_dirty_bitmap() and before bdrv_dirty_bitmaps_lock() ?
It's like a read-write lock.
The write side is invoked under the 'big QEMU lock' so there cannot be
two concurrent writes.
A bitmap can be written to after bdrv_find_dirty_bitmap returns, but
only if _you_ tell another thread about the bitmap you've just created.
If that doesn't happen, the bitmap cannot change. And it can also
disappear because _your_ thread is the one with the big QEMU lock.
Paolo
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-27 14:26 ` Paolo Bonzini
@ 2017-06-27 14:43 ` Vladimir Sementsov-Ogievskiy
2017-06-27 14:48 ` Paolo Bonzini
2017-06-27 15:31 ` Vladimir Sementsov-Ogievskiy
1 sibling, 1 reply; 42+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2017-06-27 14:43 UTC (permalink / raw)
To: Paolo Bonzini, qemu-devel; +Cc: famz
27.06.2017 17:26, Paolo Bonzini wrote:
>
> On 27/06/2017 16:20, Vladimir Sementsov-Ogievskiy wrote:
>> I'm likely not right, but for me introducing this mutex looks like dirty
>> bitmaps may be accessed from concurrent threads. So for me it looks
>> strange that only accessors are protected by the mutex and not the whole
>> transactions.
> There must be something else protecting the whole transaction.
But it doesn't? Before it (qmp_block_dirty_bitmap*) was protected by aio
context acquire/release...
>
>> One example I've wrote above, other examples from code: are
>> qmp_block_dirty_bitmap** functions:
>>
>> bdrv_create_dirty_bitmap() {
>>
>> bdrv_find_dirty_bitmap()
>>
>> ....
>>
>> bdrv_dirty_bitmaps_lock(bs);
>> QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list);
>> bdrv_dirty_bitmaps_unlock(bs);
>>
>> }
>>
>> - we protect inserting into list from other threads, but what prevent
>> creating bitmap with the same name from other thread after
>> bdrv_find_dirty_bitmap() and before bdrv_dirty_bitmaps_lock() ?
> It's like a read-write lock.
>
> The write side is invoked under the 'big QEMU lock' so there cannot be
> two concurrent writes.
>
> A bitmap can be written to after bdrv_find_dirty_bitmap returns, but
> only if _you_ tell another thread about the bitmap you've just created.
no, I'm not about touching just created bitmap. I'm about creating
bitmap with the same name by other thread (unlikely case, but possible).
> If that doesn't happen, the bitmap cannot change. And it can also
> disappear because _your_ thread is the one with the big QEMU lock.
So, if I under BQL, I don't need dirty_bitmap_lock?
>
> Paolo
--
Best regards,
Vladimir
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-27 14:43 ` Vladimir Sementsov-Ogievskiy
@ 2017-06-27 14:48 ` Paolo Bonzini
0 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-27 14:48 UTC (permalink / raw)
To: Vladimir Sementsov-Ogievskiy, qemu-devel; +Cc: famz
On 27/06/2017 16:43, Vladimir Sementsov-Ogievskiy wrote:
>> The write side is invoked under the 'big QEMU lock' so there cannot be
>> two concurrent writes.
>>
>> A bitmap can be written to after bdrv_find_dirty_bitmap returns, but
>> only if _you_ tell another thread about the bitmap you've just created.
>
> no, I'm not about touching just created bitmap. I'm about creating
> bitmap with the same name by other thread (unlikely case, but possible).
You can't unless you drop the BQL.
>> If that doesn't happen, the bitmap cannot change. And it can also
>> disappear because _your_ thread is the one with the big QEMU lock.
>
> So, if I under BQL, I don't need dirty_bitmap_lock?
Writing to the list requires _both_ BQL and dirty_bitmap_lock. Write
functions actually have "called with BQL taken" in dirty-bitmap.c,
because dirty-bitmap.c will call dirty_bitmap_lock/unlock itself.
Reading from the list requires one of the two locks. Such functions
have "called with BQL or dirty_bitmap lock taken".
For reading/writing to the bitmap itself, you need dirty_bitmap_lock.
dirty-bitmap.c can take the lock itself but, there are also functions
named *_locked where the caller takes the lock.
Paolo
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-27 14:26 ` Paolo Bonzini
2017-06-27 14:43 ` Vladimir Sementsov-Ogievskiy
@ 2017-06-27 15:31 ` Vladimir Sementsov-Ogievskiy
2017-06-27 15:32 ` Vladimir Sementsov-Ogievskiy
1 sibling, 1 reply; 42+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2017-06-27 15:31 UTC (permalink / raw)
To: Paolo Bonzini, qemu-devel; +Cc: famz
27.06.2017 17:26, Paolo Bonzini wrote:
>
> On 27/06/2017 16:20, Vladimir Sementsov-Ogievskiy wrote:
>> I'm likely not right, but for me introducing this mutex looks like dirty
>> bitmaps may be accessed from concurrent threads. So for me it looks
>> strange that only accessors are protected by the mutex and not the whole
>> transactions.
> There must be something else protecting the whole transaction.
>
>> One example I've wrote above, other examples from code: are
>> qmp_block_dirty_bitmap** functions:
>>
>> bdrv_create_dirty_bitmap() {
>>
>> bdrv_find_dirty_bitmap()
>>
>> ....
>>
>> bdrv_dirty_bitmaps_lock(bs);
>> QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list);
>> bdrv_dirty_bitmaps_unlock(bs);
>>
>> }
>>
>> - we protect inserting into list from other threads, but what prevent
>> creating bitmap with the same name from other thread after
>> bdrv_find_dirty_bitmap() and before bdrv_dirty_bitmaps_lock() ?
> It's like a read-write lock.
Ok, finally I understand (not all, but the main idea=), sorry for annoying.
>
> The write side is invoked under the 'big QEMU lock' so there cannot be
> two concurrent writes.
>
> A bitmap can be written to after bdrv_find_dirty_bitmap returns, but
> only if _you_ tell another thread about the bitmap you've just created.
> If that doesn't happen, the bitmap cannot change. And it can also
> disappear because _your_ thread is the one with the big QEMU lock.
>
> Paolo
--
Best regards,
Vladimir
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-27 15:31 ` Vladimir Sementsov-Ogievskiy
@ 2017-06-27 15:32 ` Vladimir Sementsov-Ogievskiy
2017-06-27 15:42 ` Paolo Bonzini
0 siblings, 1 reply; 42+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2017-06-27 15:32 UTC (permalink / raw)
To: Paolo Bonzini, qemu-devel; +Cc: famz
27.06.2017 18:31, Vladimir Sementsov-Ogievskiy wrote:
> 27.06.2017 17:26, Paolo Bonzini wrote:
>>
>> On 27/06/2017 16:20, Vladimir Sementsov-Ogievskiy wrote:
>>> I'm likely not right, but for me introducing this mutex looks like
>>> dirty
>>> bitmaps may be accessed from concurrent threads. So for me it looks
>>> strange that only accessors are protected by the mutex and not the
>>> whole
>>> transactions.
>> There must be something else protecting the whole transaction.
>>
>>> One example I've wrote above, other examples from code: are
>>> qmp_block_dirty_bitmap** functions:
>>>
>>> bdrv_create_dirty_bitmap() {
>>>
>>> bdrv_find_dirty_bitmap()
>>>
>>> ....
>>>
>>> bdrv_dirty_bitmaps_lock(bs);
>>> QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list);
>>> bdrv_dirty_bitmaps_unlock(bs);
>>>
>>> }
>>>
>>> - we protect inserting into list from other threads, but what prevent
>>> creating bitmap with the same name from other thread after
>>> bdrv_find_dirty_bitmap() and before bdrv_dirty_bitmaps_lock() ?
>> It's like a read-write lock.
>
> Ok, finally I understand (not all, but the main idea=), sorry for
> annoying.
Is there any example of accessing dirty bitmaps for read not under BQL
but only under dirty bitmap lock?
>
>>
>> The write side is invoked under the 'big QEMU lock' so there cannot be
>> two concurrent writes.
>>
>> A bitmap can be written to after bdrv_find_dirty_bitmap returns, but
>> only if _you_ tell another thread about the bitmap you've just created.
>> If that doesn't happen, the bitmap cannot change. And it can also
>> disappear because _your_ thread is the one with the big QEMU lock.
>>
>> Paolo
>
>
--
Best regards,
Vladimir
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex
2017-06-27 15:32 ` Vladimir Sementsov-Ogievskiy
@ 2017-06-27 15:42 ` Paolo Bonzini
0 siblings, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2017-06-27 15:42 UTC (permalink / raw)
To: Vladimir Sementsov-Ogievskiy, qemu-devel; +Cc: famz
On 27/06/2017 17:32, Vladimir Sementsov-Ogievskiy wrote:
>>>>
>>>>
>>>> - we protect inserting into list from other threads, but what prevent
>>>> creating bitmap with the same name from other thread after
>>>> bdrv_find_dirty_bitmap() and before bdrv_dirty_bitmaps_lock() ?
>>> It's like a read-write lock.
>>
>> Ok, finally I understand (not all, but the main idea=), sorry for
>> annoying.
>
> Is there any example of accessing dirty bitmaps for read not under BQL
> but only under dirty bitmap lock?
Yes, search for bdrv_dirty_bitmap_lock...unlock in block/mirror.c.
There is also block/backup.c, which operates on a frozen bitmap.
Paolo
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 19/19] block: make accounting thread-safe
2017-06-05 12:39 ` [Qemu-devel] [PATCH 19/19] block: make accounting thread-safe Paolo Bonzini
2017-06-06 15:45 ` Alberto Garcia
@ 2018-05-24 13:35 ` Alberto Garcia
2018-05-24 13:49 ` Alberto Garcia
2018-05-24 13:49 ` Paolo Bonzini
1 sibling, 2 replies; 42+ messages in thread
From: Alberto Garcia @ 2018-05-24 13:35 UTC (permalink / raw)
To: Paolo Bonzini, qemu-devel; +Cc: famz
On Mon 05 Jun 2017 02:39:08 PM CEST, Paolo Bonzini wrote:
> @@ -102,6 +107,8 @@ static void block_account_one_io(BlockAcctStats *stats, BlockAcctCookie *cookie,
>
> assert(cookie->type < BLOCK_MAX_IOTYPE);
>
> + qemu_mutex_lock(&stats->lock);
QEMU crashes because this lock is not initialized if you do aio_read
directly from a BDS not attached to a BlockBackend (should that
operation be legal at all?)
$ qemu-system-x86_64 -monitor stdio \
-blockdev driver=qcow2,file.driver=file,file.filename=hd0.img,node-name=hd0
(qemu) qemu-io hd0 "aio_read 0 1M"
qemu-system-x86_64: util/qemu-thread-posix.c:64: qemu_mutex_lock_impl: Assertion `mutex->initialized' failed.
Aborted
Berto
^ permalink raw reply [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 19/19] block: make accounting thread-safe
2018-05-24 13:35 ` Alberto Garcia
@ 2018-05-24 13:49 ` Alberto Garcia
2018-05-24 13:49 ` Paolo Bonzini
1 sibling, 0 replies; 42+ messages in thread
From: Alberto Garcia @ 2018-05-24 13:49 UTC (permalink / raw)
To: Paolo Bonzini, qemu-devel; +Cc: famz
On Thu 24 May 2018 03:35:50 PM CEST, Alberto Garcia wrote:
> On Mon 05 Jun 2017 02:39:08 PM CEST, Paolo Bonzini wrote:
>> @@ -102,6 +107,8 @@ static void block_account_one_io(BlockAcctStats *stats, BlockAcctCookie *cookie,
>>
>> assert(cookie->type < BLOCK_MAX_IOTYPE);
>>
>> + qemu_mutex_lock(&stats->lock);
>
> QEMU crashes because this lock is not initialized if you do aio_read
> directly from a BDS not attached to a BlockBackend (should that
> operation be legal at all?)
I see, hmp_qemu_io() creates a temporary BlockBackend in these
situations, so I guess what we need is something like this:
diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index 9b3cd00af6..7b195ec4e3 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -1294,6 +1294,7 @@ static void aio_read_done(void *opaque, int ret)
print_report("read", &t2, ctx->offset, ctx->qiov.size,
ctx->qiov.size, 1, ctx->Cflag);
out:
+ blk_unref(ctx->blk);
qemu_io_free(ctx->buf);
qemu_iovec_destroy(&ctx->qiov);
g_free(ctx);
@@ -1392,6 +1393,7 @@ static int aio_read_f(BlockBackend *blk, int argc, char **argv)
gettimeofday(&ctx->t1, NULL);
block_acct_start(blk_get_stats(blk), &ctx->acct, ctx->qiov.size,
BLOCK_ACCT_READ);
+ blk_ref(blk);
blk_aio_preadv(blk, ctx->offset, &ctx->qiov, 0, aio_read_done,
ctx);
return 0;
}
Berto
^ permalink raw reply related [flat|nested] 42+ messages in thread
* Re: [Qemu-devel] [PATCH 19/19] block: make accounting thread-safe
2018-05-24 13:35 ` Alberto Garcia
2018-05-24 13:49 ` Alberto Garcia
@ 2018-05-24 13:49 ` Paolo Bonzini
1 sibling, 0 replies; 42+ messages in thread
From: Paolo Bonzini @ 2018-05-24 13:49 UTC (permalink / raw)
To: Alberto Garcia, qemu-devel; +Cc: famz, Greg Kurz
On 24/05/2018 15:35, Alberto Garcia wrote:
> On Mon 05 Jun 2017 02:39:08 PM CEST, Paolo Bonzini wrote:
>> @@ -102,6 +107,8 @@ static void block_account_one_io(BlockAcctStats *stats, BlockAcctCookie *cookie,
>>
>> assert(cookie->type < BLOCK_MAX_IOTYPE);
>>
>> + qemu_mutex_lock(&stats->lock);
>
> QEMU crashes because this lock is not initialized if you do aio_read
> directly from a BDS not attached to a BlockBackend (should that
> operation be legal at all?)
>
> $ qemu-system-x86_64 -monitor stdio \
> -blockdev driver=qcow2,file.driver=file,file.filename=hd0.img,node-name=hd0
>
> (qemu) qemu-io hd0 "aio_read 0 1M"
> qemu-system-x86_64: util/qemu-thread-posix.c:64: qemu_mutex_lock_impl: Assertion `mutex->initialized' failed.
> Aborted
The lock is initialized but it has been destroyed via qemu_mutex_destroy
before you reach this point. So the bug is actually much more than just
the uninitialized lock!
The destruction happens when blk_delete calls block_acct_cleanup. It
should be fixed by Greg Kurz's patch that adds a bdrv_drained_begin/end
pair to bdrv_root_unref_child.
Thanks,
Paolo
^ permalink raw reply [flat|nested] 42+ messages in thread
end of thread, other threads:[~2018-05-24 13:49 UTC | newest]
Thread overview: 42+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-06-05 12:38 [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 01/19] block: access copy_on_read with atomic ops Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 02/19] block: access quiesce_counter " Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 03/19] block: access io_limits_disabled " Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 04/19] block: access serialising_in_flight " Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 05/19] block: access wakeup " Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 06/19] block: access io_plugged " Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 07/19] throttle-groups: only start one coroutine from drained_begin Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 08/19] throttle-groups: do not use qemu_co_enter_next Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 09/19] throttle-groups: protect throttled requests with a CoMutex Paolo Bonzini
2017-06-05 12:38 ` [Qemu-devel] [PATCH 10/19] util: add stats64 module Paolo Bonzini
2017-06-05 12:39 ` [Qemu-devel] [PATCH 11/19] block: use Stat64 for wr_highest_offset Paolo Bonzini
2017-06-05 12:39 ` [Qemu-devel] [PATCH 12/19] block: access write_gen with atomics Paolo Bonzini
2017-06-05 12:39 ` [Qemu-devel] [PATCH 13/19] block: protect tracked_requests and flush_queue with reqs_lock Paolo Bonzini
2017-06-05 12:39 ` [Qemu-devel] [PATCH 14/19] block: introduce dirty_bitmap_mutex Paolo Bonzini
2017-06-05 12:39 ` [Qemu-devel] [PATCH 15/19] migration/block: reset dirty bitmap before reading Paolo Bonzini
2017-06-05 12:39 ` [Qemu-devel] [PATCH 16/19] block: protect modification of dirty bitmaps with a mutex Paolo Bonzini
2017-06-26 16:07 ` Vladimir Sementsov-Ogievskiy
2017-06-26 16:54 ` Paolo Bonzini
2017-06-27 9:07 ` Vladimir Sementsov-Ogievskiy
2017-06-27 9:27 ` Paolo Bonzini
2017-06-27 9:47 ` Vladimir Sementsov-Ogievskiy
2017-06-27 12:52 ` Paolo Bonzini
2017-06-27 13:51 ` Vladimir Sementsov-Ogievskiy
2017-06-27 13:58 ` Paolo Bonzini
2017-06-27 14:20 ` Vladimir Sementsov-Ogievskiy
2017-06-27 14:26 ` Paolo Bonzini
2017-06-27 14:43 ` Vladimir Sementsov-Ogievskiy
2017-06-27 14:48 ` Paolo Bonzini
2017-06-27 15:31 ` Vladimir Sementsov-Ogievskiy
2017-06-27 15:32 ` Vladimir Sementsov-Ogievskiy
2017-06-27 15:42 ` Paolo Bonzini
2017-06-05 12:39 ` [Qemu-devel] [PATCH 17/19] block: introduce block_account_one_io Paolo Bonzini
2017-06-05 12:39 ` [Qemu-devel] [PATCH 18/19] block: split BlockAcctStats creation and setup Paolo Bonzini
2017-06-06 15:43 ` Alberto Garcia
2017-06-05 12:39 ` [Qemu-devel] [PATCH 19/19] block: make accounting thread-safe Paolo Bonzini
2017-06-06 15:45 ` Alberto Garcia
2018-05-24 13:35 ` Alberto Garcia
2018-05-24 13:49 ` Alberto Garcia
2018-05-24 13:49 ` Paolo Bonzini
2017-06-05 13:18 ` [Qemu-devel] [PATCH v4 00/19] Block layer thread safety, part 1 no-reply
2017-06-07 0:04 ` Fam Zheng
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