This is a follow up on a very old thread[1]. My aim is to attach/detatch nvme
devices during runtime and test the Linux nvme subsystem in the guest.
In order to it working, I had first to add hotplug able PCI bus and the
nvme-subsystem. The nvme-subsystem can't be instatiated during runtime so far
(libvirtd config):
<qemu:commandline>
<qemu:arg value='-device'/>
<qemu:arg value='pcie-root-port,id=root,bus=pcie.0,addr=0x6'/>
<qemu:arg value='-device'/>
<qemu:arg value='nvme-subsys,id=nvme-subsys-1,nqn=nvme-1'/>
</qemu:commandline>
and then with a bunch of monitor commands:
qemu-monitor-command tw --hmp device_add
nvme,id=nvme1,serial=nvme-1,subsys=nvme-subsys-1,bus=root
qemu-monitor-command tw --hmp drive_add 0
if=none,file=/var/lib/libvirt/images/tw-nvme1.img,format=raw,id=nvme1
qemu-monitor-command tw --hmp device_add nvme-ns,drive=nvme1,shared=on
qemu-monitor-command tw --hmp info block
qemu-monitor-command tw --hmp device_del nvme1
I see the nvme device pop up in the guest:
[ 187.047693 ] pci 0000:0f:00.0: [1b36:0010] type 00 class 0x010802
[ 187.050324 ] pci 0000:0f:00.0: reg 0x10: [mem 0x00000000-0x00003fff 64bit]
[ 187.098823 ] pci 0000:0f:00.0: BAR 0: assigned [mem 0xc0800000-0xc0803fff
64bit]
[ 187.102173 ] nvme nvme1: pci function 0000:0f:00.0
[ 187.103084 ] nvme 0000:0f:00.0: enabling device (0000 -> 0002)
[ 187.131154 ] nvme nvme1: 4/0/0 default/read/poll queues
[ 187.133460 ] nvme nvme1: Ignoring bogus Namespace Identifiers
and it looks pretty reasonable:
# nvme list -v
Subsystem Subsystem-NQN
Controllers
----------------
------------------------------------------------------------------------------------------------
----------------
nvme-subsys1 nqn.2019-08.org.qemu:nvme-1
nvme1
nvme-subsys0 nqn.2019-08.org.qemu:nvme-0
nvme0
Device SN MN FR
TxPort Address Subsystem Namespaces
-------- -------------------- ----------------------------------------
-------- ------ -------------- ------------ ----------------
nvme1 nvme-1 QEMU NVMe Ctrl 8.0.0
pcie 0000:0f:00.0 nvme-subsys1 nvme1n1
nvme0 nvme-0 QEMU NVMe Ctrl 8.0.0
pcie 0000:00:05.0 nvme-subsys0 nvme0n1
Device Generic NSID Usage Format
Controllers
------------ ------------ ---------- --------------------------
---------------- ----------------
/dev/nvme1n1 /dev/ng1n1 0x1 1.07 GB / 1.07 GB 512 B + 0
B nvme1
/dev/nvme0n1 /dev/ng0n1 0x1 1.07 GB / 1.07 GB 512 B + 0
B nvme0
[1] https://lore.kernel.org/all/Y195nENga028PvT9@cormorant.local/
Daniel Wagner (1):
hw/nvme: Add hotplug handler to nvme bus
hw/nvme/ctrl.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
--
2.40.0
