Re: [PATCH v3 1/2] hw/nvme: Implement shadow doorbell buffer support

[Guenter Roeck]

On Thu, Dec 08, 2022 at 10:47:42AM -0800, Guenter Roeck wrote:
> > 
> > A cq head doorbell mmio is skipped... And it is not the fault of the
> > kernel. The kernel is in it's good right to skip the mmio since the cq
> > eventidx is not properly updated.
> > 
> > Adding that and it boots properly on riscv. But I'm perplexed as to why
> > this didnt show up on our regularly tested platforms.
> > 
> > Gonna try to get this in for 7.2!
> 
> I see another problem with sparc64.
> 
> [    5.261508] could not locate request for tag 0x0
> [    5.261711] nvme nvme0: invalid id 0 completed on queue 1
> 
> That is seen repeatedly until the request times out. I'll test with
> your patch to see if it resolves this problem as well, and will bisect
> otherwise.
> 
The second problem is unrelated to the doorbell problem.
It is first seen in qemu v7.1. I'll try to bisect.

Guenter