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Re: [Qemu-devel] [Bug 1576347] [NEW] Only one NVMe device is usable in W

From: Keith Busch
Subject: Re: [Qemu-devel] [Bug 1576347] [NEW] Only one NVMe device is usable in Windows (10) guest
Date: Wed, 4 May 2016 18:20:01 -0400
User-agent: Mutt/1.5.23 (2014-03-12)

On Fri, Apr 29, 2016 at 10:10:39AM +0100, Stefan Hajnoczi wrote:
> On Thu, Apr 28, 2016 at 05:44:21PM -0000, Tom Yan wrote:
> CCing Keith Busch <address@hidden>, maintainer of QEMU NVMe.
> Maybe he has an idea.

Thanks for the report. Sounds like a Windows specific issue as I have no
problem with multiple nvme drives on my dev machines:

# uname -r

# qemu-system-x86_64 --version
QEMU emulator version 2.5.50, Copyright (c) 2003-2008 Fabrice Bellard

# qemu-system-x86_64 -m 4096 -smp 4 -enable-kvm debian.img \
    -drive file=nvme.1.img,if=none,id=one -device nvme,drive=one,serial=foo \
    -drive file=nvme.2.img,if=none,id=two -device nvme,drive=two,serial=bar 

# uname -r

# ls /dev/nvme*
/dev/nvme0  /dev/nvme0n1  /dev/nvme1  /dev/nvme1n1

# nvme id-ctrl /dev/nvme0 | grep sn
sn     : foo

# nvme id-ctrl /dev/nvme1 | grep sn
sn     : bar
> > When there are two NVMe devices specified, only the second one will be
> > usable in Windows. The following error is shown under "Device status" of
> > the failed NVMe controller in Device Manager:
> > 
> > "This device cannot start. (Code 10)
> > 
> > The I/O device is configured incorrectly or the configuration parameters
> > to the driver are incorrect."
> > 
> > The only thing seems suspicious to me is that the nvme emulation in qemu
> > does not have WWN/EUI-64 set for the devices, though I have no idea at
> > all whether that is mandatory:

These are not mandatory. They were only introduced in the 1.1 and 1.2 versions
of the NVMe spec, though we only cared to emulate the 1.0 portions rather than
provide a full featured NVMe controller.

That said, there needs to be care in the host OS to provide an appropriate
translation IF it is using a SCSI stack to talk to NVMe. Linux doesn't care,
but Windows does.

> > "C:\Windows\system32>sg_vpd -i PD1
> > Device Identification VPD page:
> >   Addressed logical unit:
> >     designator type: SCSI name string,  code set: UTF-8
> >       SCSI name string:
> >       8086QEMU NVMe Ctrl                          00012BDAC262CF831698

The above looks reasonable for your second controller that had serial

> > C:\Windows\system32>sg_vpd -p sn PD1
> > Unit serial number VPD page:
> >   Unit serial number: 0000_0000_0000_0000."

This doesn't look like a very good SCSI-NVMe translation and possibly
suspicious. But I don't know the first thing about windows; does it care about
unique unit serial numbers in order to surface a "SCSI" disk?

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