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Re: [Qemu-devel] [PATCH v2] blockdev: reset werror/rerror on drive_del
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [PATCH v2] blockdev: reset werror/rerror on drive_del |
Date: |
Wed, 5 Jun 2013 11:00:32 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Am 05.06.2013 um 10:33 hat Stefan Hajnoczi geschrieben:
> Paolo Bonzini <address@hidden> suggested the following test case:
>
> 1. Launch a guest and wait at the GRUB boot menu:
>
> qemu-system-x86_64 -enable-kvm -m 1024 \
> -drive if=none,cache=none,file=test.img,id=foo,werror=stop,rerror=stop
> -device virtio-blk-pci,drive=foo,id=virtio0,addr=4
>
> 2. Hot unplug the device:
>
> (qemu) drive_del foo
>
> 3. Select the first boot menu entry
Can we have a qtest or qemu-iotests version of this manual test case?
> Without this patch the guest pauses due to ENOMEDIUM. The guest is
> stuck in a continuous pause loop since the I/O request is retried and
> fails immediately again when the guest is resumed.
>
> With this patch the error is reported to the guest.
>
> Note that this scenario actually happens sometimes during libvirt disk
> hot unplug, where device_del is followed by drive_del. I/O may still be
> submitted to the drive after drive_del if the guest does not process the
> PCI hot unplug notification.
>
> Reported-by: Dafna Ron <address@hidden>
> Signed-off-by: Stefan Hajnoczi <address@hidden>
Reviewed-by: Kevin Wolf <address@hidden>