Public bug reported:
Hi, I found a bug that disk missing (not all disks missing ) in the
guest contingently when hotplug several virtio scsi disks consecutively.
After rebooting the guest,the missing disks appear again.
The guest is centos7.3 running on a centos7.3 host and the scsi
controllers are configed with iothread. The scsi controller xml is
below:
<controller type='scsi' index='0' model='virtio-scsi'>
<driver iothread='26'/>
<alias name='scsi0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07'
function='0x0'/>
</controller>
If the scsi controllers are configed without iothread, disks are all
can be seen in the guest when hotplug several virtio scsi disks
consecutively.
I think the biggest difference between them is that scsi controllers
with iothread call virtio_notify_irqfd to notify guest and scsi
controllers without iothread call virtio_notify instead. What make it
difference? Will interrupts are lost when call virtio_notify_irqfd due
to race condition for some unknow reasons? Maybe guys more familiar
with scsi dataplane can help. Thanks for your reply!
** Affects: qemu
Importance: Undecided
Status: New
** Description changed:
Hi, I found a bug that disk missing (not all disks missing ) in the
guest contingently when hotplug several virtio scsi disks consecutively.
After rebooting the guest,the missing disks appear again.
The guest is centos7.3 running on a centos7.3 host and the scsi
controllers are configed with iothread. The scsi controller xml is
below:
- <controller type='scsi' index='0' model='virtio-scsi'>
- <driver iothread='26'/>
- <alias name='scsi0'/>
- <address type='pci' domain='0x0000' bus='0x00' slot='0x07'
function='0x0'/>
- </controller>
+ <controller type='scsi' index='0' model='virtio-scsi'>
+ <driver iothread='26'/>
+ <alias name='scsi0'/>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x07'
function='0x0'/>
+ </controller>
-
- If the scsi controllers are configed without iothread, disks are all can be
seen in the guest when hotplug several virtio scsi disks consecutively.
+ If the scsi controllers are configed without iothread, disks are all
+ can be seen in the guest when hotplug several virtio scsi disks
+ consecutively.
I think the biggest difference between them is that scsi controllers
with iothread call virtio_notify_irqfd to notify guest and scsi
- controllers without
-
- iothread call virtio_notify instead. What make it difference? Will
- interrupts are lost when call virtio_notify_irqfd due to race
- condition for some unknow reasons? Maybe guys more familiar with scsi
- dataplane can help. Thanks for your reply!
+ controllers without iothread call virtio_notify instead. What make it
+ difference? Will interrupts are lost when call virtio_notify_irqfd due
+ to race condition for some unknow reasons? Maybe guys more familiar
+ with scsi dataplane can help. Thanks for your reply!
--
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https://bugs.launchpad.net/bugs/1779120
Title:
disk missing in the guest contingently when hotplug several virtio
scsi disks consecutively
Status in QEMU:
New
Bug description:
Hi, I found a bug that disk missing (not all disks missing ) in the
guest contingently when hotplug several virtio scsi disks
consecutively. After rebooting the guest,the missing disks appear
again.
The guest is centos7.3 running on a centos7.3 host and the scsi
controllers are configed with iothread. The scsi controller xml is
below:
<controller type='scsi' index='0' model='virtio-scsi'>
<driver iothread='26'/>
<alias name='scsi0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07'
function='0x0'/>
</controller>
If the scsi controllers are configed without iothread, disks are all
can be seen in the guest when hotplug several virtio scsi disks
consecutively.
I think the biggest difference between them is that scsi controllers
with iothread call virtio_notify_irqfd to notify guest and scsi
controllers without iothread call virtio_notify instead. What make it
difference? Will interrupts are lost when call virtio_notify_irqfd
due to race condition for some unknow reasons? Maybe guys more
familiar with scsi dataplane can help. Thanks for your reply!
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