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Block layer patches

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- Allow concurrent BB context changes
 - virtio: Re-enable notifications after drain
 - virtio-blk: Fix missing use of irqfd
 - scsi: Don't ignore most usb-storage properties
 - blkio: Respect memory-alignment for bounce buffer allocations
 - iotests tmpdir fixes
 - virtio-blk: Code cleanups
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Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- Allow concurrent BB context changes
- virtio: Re-enable notifications after drain
- virtio-blk: Fix missing use of irqfd
- scsi: Don't ignore most usb-storage properties
- blkio: Respect memory-alignment for bounce buffer allocations
- iotests tmpdir fixes
- virtio-blk: Code cleanups

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* tag 'for-upstream' of https://repo.or.cz/qemu/kevin:
  virtio-blk: avoid using ioeventfd state in irqfd conditional
  virtio-blk: Use ioeventfd_attach in start_ioeventfd
  virtio: Re-enable notifications after drain
  virtio-scsi: Attach event vq notifier with no_poll
  blkio: Respect memory-alignment for bounce buffer allocations
  scsi: Don't ignore most usb-storage properties
  virtio-blk: do not use C99 mixed declarations
  iotests: give tempdir an identifying name
  iotests: fix leak of tmpdir in dry-run mode
  scsi: Await request purging
  block-backend: Allow concurrent context changes
  monitor: use aio_co_reschedule_self()
  virtio-blk: declare VirtIOBlock::rq with a type
  virtio-blk: add vq_rq[] bounds check in virtio_blk_dma_restart_cb()
  virtio-blk: clarify that there is at least 1 virtqueue
  virtio-blk: enforce iothread-vq-mapping validation

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2024-02-08 20:08:44 +00:00
commit e2beaf7bad
13 changed files with 236 additions and 158 deletions
Download patch file Download diff file Expand all files Collapse all files

42
hw/virtio/virtio.c
View file

@ -3556,6 +3556,17 @@ static void virtio_queue_host_notifier_aio_poll_end(EventNotifier *n)
void virtio_queue_aio_attach_host_notifier(VirtQueue *vq, AioContext *ctx)
{
/*
* virtio_queue_aio_detach_host_notifier() can leave notifications disabled.
* Re-enable them. (And if detach has not been used before, notifications
* being enabled is still the default state while a notifier is attached;
* see virtio_queue_host_notifier_aio_poll_end(), which will always leave
* notifications enabled once the polling section is left.)
*/
if (!virtio_queue_get_notification(vq)) {
virtio_queue_set_notification(vq, 1);
}
aio_set_event_notifier(ctx, &vq->host_notifier,
virtio_queue_host_notifier_read,
virtio_queue_host_notifier_aio_poll,
@ -3563,6 +3574,13 @@ void virtio_queue_aio_attach_host_notifier(VirtQueue *vq, AioContext *ctx)
aio_set_event_notifier_poll(ctx, &vq->host_notifier,
virtio_queue_host_notifier_aio_poll_begin,
virtio_queue_host_notifier_aio_poll_end);
/*
* We will have ignored notifications about new requests from the guest
* while no notifiers were attached, so "kick" the virt queue to process
* those requests now.
*/
event_notifier_set(&vq->host_notifier);
}
/*
@ -3573,14 +3591,38 @@ void virtio_queue_aio_attach_host_notifier(VirtQueue *vq, AioContext *ctx)
*/
void virtio_queue_aio_attach_host_notifier_no_poll(VirtQueue *vq, AioContext *ctx)
{
/* See virtio_queue_aio_attach_host_notifier() */
if (!virtio_queue_get_notification(vq)) {
virtio_queue_set_notification(vq, 1);
}
aio_set_event_notifier(ctx, &vq->host_notifier,
virtio_queue_host_notifier_read,
NULL, NULL);
/*
* See virtio_queue_aio_attach_host_notifier().
* Note that this may be unnecessary for the type of virtqueues this
* function is used for. Still, it will not hurt to have a quick look into
* whether we can/should process any of the virtqueue elements.
*/
event_notifier_set(&vq->host_notifier);
}
void virtio_queue_aio_detach_host_notifier(VirtQueue *vq, AioContext *ctx)
{
aio_set_event_notifier(ctx, &vq->host_notifier, NULL, NULL, NULL);
/*
* aio_set_event_notifier_poll() does not guarantee whether io_poll_end()
* will run after io_poll_begin(), so by removing the notifier, we do not
* know whether virtio_queue_host_notifier_aio_poll_end() has run after a
* previous virtio_queue_host_notifier_aio_poll_begin(), i.e. whether
* notifications are enabled or disabled. It does not really matter anyway;
* we just removed the notifier, so we do not care about notifications until
* we potentially re-attach it. The attach_host_notifier functions will
* ensure that notifications are enabled again when they are needed.
*/
}
void virtio_queue_host_notifier_read(EventNotifier *n)