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Re: [PATCH 0/3] RFC: few random hacks to improve eventfd fallback path

From: Paolo Bonzini
Subject: Re: [PATCH 0/3] RFC: few random hacks to improve eventfd fallback path
Date: Wed, 13 Jan 2021 15:38:15 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0

On 17/12/20 16:00, Maxim Levitsky wrote:
These few patches are the result of a random hacking I did to make the qemu
cope with eventfd allocation failure, when using an iothread,
as it happened in bz #1897550.

I am not 100% sure which patches in this series are worth to merge, or if
this can be fixed in a better way.

After this patch series applied, qemu still hangs while running reproducer for
this BZ due to ABBA lock inversion which needs some heavy rework to get rid of.
I explained all the (gory) details in the bugzilla.

This patch series was (lightly) tested with make check, iotests and with
the reproducer.

Best regards,
        Maxim Levitsky

Maxim Levitsky (3):
   scsi: virtio-scsi: don't process IO on fenced dataplane
   virtio-scsi: don't uninitialize queues that we didn't initialize
   event_notifier: handle initialization failure better

  hw/scsi/virtio-scsi-dataplane.c | 26 +++++++++++++++++++-------
  include/qemu/event_notifier.h   |  1 +
  util/event_notifier-posix.c     | 16 ++++++++++++++++
  3 files changed, 36 insertions(+), 7 deletions(-)

Queued, thanks.


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