Re: [Qemu-block] [Qemu-devel] How to emulate block I/O timeout on qemu side?

[John Snow]

On 11/02/2018 04:11 AM, Dongli Zhang wrote:
> Hi,
> 
> Is there any way to emulate I/O timeout on qemu side (not fault injection in 
> VM
> kernel) without modifying qemu source code?
> 
> For instance, I would like to observe/study/debug the I/O timeout handling of
> nvme, scsi, virtio-blk (not supported) of VM kernel.
> 
> Is there a way to trigger this on purpose on qemu side?
> 
> Thank you very much!
> 
> Dongli Zhang
> 

I don't think the blkdebug driver supports arbitrary delays right now.
Maybe we could augment it to do so?

(I thought someone already had, but maybe it wasn't merged?)

Aha, here:

https://lists.gnu.org/archive/html/qemu-devel/2018-08/msg05297.html
V2: https://lists.gnu.org/archive/html/qemu-devel/2018-09/msg00394.html

Let's work from there.

--js