Re: [PATCH v4] hw/nvme: Use ioeventfd to handle doorbell updates

[Klaus Jensen]

On Jul 26 15:35, Jinhao Fan wrote:
> at 4:55 AM, Klaus Jensen <its@irrelevant.dk> wrote:
> 
> > 
> > We have a regression following this patch that we need to address.
> > 
> > With this patch, issuing a reset on the device (`nvme reset /dev/nvme0`
> > will do the trick) causes QEMU to hog my host cpu at 100%.
> > 
> > I'm still not sure what causes this. The trace output is a bit
> > inconclusive still.
> > 
> > I'll keep looking into it.
> 
> I cannot reproduce this bug. I just start the VM and used `nvme reset
> /dev/nvme0`. Did you do anything before the reset?
> 

Interesting and thanks for checking! Looks like a kernel issue then!

I remember that I'm using a dev branch (nvme-v5.20) of the kernel and
reverting to a stock OS kernel did not produce the bug.

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