Bug 1998027

Assigning to Phil who took the RHEL8.x clone of it.. I'm using low-priority since any upstream fix will naturally come to RHEL9 with the 6.2 rebase eventually, and I don't think this is sufficiently important for us to backport - so it's probably just sit around for a while.

*** Bug 2002458 has been marked as a duplicate of this bug. ***

*** Bug 2002458 has been marked as a duplicate of this bug. ***

Housekeeping - the referenced commit went into qemu-6.2 which is planned to be rebased some time in Nov/Dec when it's "released" upstream. It may be the case that an 6.2-rc release could be used for an early rebase, but we'll need to revisit this then.

Was notified by QE of this existing copy instead of the clone I created in bug 2002458 (see c5 there for some details).

Actually assign to Phil, set devel_ack+, set DTM=14 and moved to POST under the assumption this would be picked up by the rebase at that time.

Also hit the issue in qemu-img.


Tested env:
kernel-5.14.0-0.rc7.54.el9.x86_64
qemu-kvm-6.1.0-2.el9


Steps:
1. Check the source image info
# qemu-img info target.qcow2 
image: target.qcow2
file format: qcow2
virtual size: 20 GiB (21474836480 bytes)
disk size: 3.32 GiB
cluster_size: 65536
Format specific information:
    compat: 1.1
    compression type: zlib
    lazy refcounts: false
    refcount bits: 16
    corrupt: false
    extended l2: false

2. Convert the source image to a image over NVMe
# qemu-img convert -f qcow2 -O raw target.qcow2 nvme://0000:bc:00.0/1 -p
qemu-img: VFIO_MAP_DMA failed: No space left on device
qemu-img: VFIO_MAP_DMA failed: No space left on device
    (100.00/100%)

(In reply to Tingting Mao from comment #5)
> Also hit the issue in qemu-img.
> 2. Convert the source image to a image over NVMe
> # qemu-img convert -f qcow2 -O raw target.qcow2 nvme://0000:bc:00.0/1 -p
> qemu-img: VFIO_MAP_DMA failed: No space left on device
> qemu-img: VFIO_MAP_DMA failed: No space left on device
>     (100.00/100%)

Thanks for testing qemu-img.

The same fix applies to both qemu-kvm and qemu-img:
https://bugzilla.redhat.com/show_bug.cgi?id=1996530#c6

The POST status is still valid.

QE bot(pre verify): Set 'Verified:Tested,SanityOnly' as gating/tier1 test pass.

Tried in latest qemu, there is no the hint info anymore.


Tested with:
qemu-kvm-6.2.0-1.el9
kernel-5.14.0-32.el9.x86_64


Scenario1 - Install guest with qcow2/luks image over NVMe
/usr/libexec/qemu-kvm \
    -S  \
    -name 'avocado-vt-vm1'  \
    -sandbox on  \
    -machine q35 \
    -device pcie-root-port,id=pcie-root-port-0,multifunction=on,bus=pcie.0,addr=0x1,chassis=1 \
    -device pcie-pci-bridge,id=pcie-pci-bridge-0,addr=0x0,bus=pcie-root-port-0  \
    -nodefaults \
    -device VGA,bus=pcie.0,addr=0x2 \
    -m 15360  \
    -smp 16,maxcpus=16,cores=8,threads=1,dies=1,sockets=2  \
    -cpu 'Haswell-noTSX',+kvm_pv_unhalt \
    -device pcie-root-port,id=pcie-root-port-1,port=0x1,addr=0x1.0x1,bus=pcie.0,chassis=2 \
    -device qemu-xhci,id=usb1,bus=pcie-root-port-1,addr=0x0 \
    -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 \
    -object iothread,id=iothread0 \
    -object iothread,id=iothread1 \
    -device pcie-root-port,id=pcie-root-port-3,port=0x3,addr=0x1.0x3,bus=pcie.0,chassis=4 \
    -device virtio-net-pci,mac=9a:1c:0c:0d:e3:4c,id=idjmZXQS,netdev=idEFQ4i1,bus=pcie-root-port-3,addr=0x0  \
    -netdev tap,id=idEFQ4i1,vhost=on  \
    -vnc :0  \
    -rtc base=utc,clock=host,driftfix=slew  \
    -boot menu=off,order=cdn,once=c,strict=off \
    -enable-kvm \
    -monitor stdio \
    -chardev socket,server=on,path=/var/tmp/monitor-qmpmonitor1-20210721-024113-AsZ7KYro,id=qmp_id_qmpmonitor1,wait=off  \
    -mon chardev=qmp_id_qmpmonitor1,mode=control \
    -object secret,id=sec0,data=redhat \
    -device pcie-root-port,id=pcie-root-port-5,port=0x5,addr=0x1.0x5,bus=pcie.0,chassis=5 \
    -device virtio-scsi-pci,id=virtio_scsi_pci1,bus=pcie-root-port-5,addr=0x0,iothread=iothread1 \
    -blockdev node-name=nvme_image1,driver=nvme,device=0000:bc:00.0,namespace=1,auto-read-only=on,discard=unmap \
    -blockdev node-name=drive_nvme1,driver=luks,key-secret=sec0,file=nvme_image1,read-only=off,discard=unmap \
    -device scsi-hd,id=nvme1,drive=drive_nvme1 \
    -device pcie-root-port,id=pcie-root-port-6,port=0x6,addr=0x1.0x6,bus=pcie.0,chassis=6 \
    -device virtio-scsi-pci,id=virtio_scsi_pci2,bus=pcie-root-port-6,addr=0x0 \
    -blockdev node-name=file_cd1,driver=file,auto-read-only=on,discard=unmap,aio=threads,filename=/home/kvm_autotest_root/iso/linux/RHEL-9.0.0-20211216.2-x86_64-dvd1.iso,cache.direct=on,cache.no-flush=off \
    -blockdev node-name=drive_cd1,driver=raw,read-only=on,cache.direct=on,cache.no-flush=off,file=file_cd1 \
    -device scsi-cd,id=cd1,drive=drive_cd1,write-cache=on \


Scenario2 - Convert via qemu-img
# qemu-img convert -f qcow2 -O raw RHEL-9.0.0-20210702.2-x86_64.qcow2 nvme://0000:bc:00.0/1 -p
    (100.00/100%)


Results:
No the hint info.