[Bug 1872790] Re: empty qcow2

[a <1872790@bugs.launchpad.net>]

WDM claims it to be a MBR

Linux 5.6.14

QEMU 5.0.0-6

`nobody     19023  109 21.1 7151512 3462300 ?     Sl   13:18   0:32
/usr/bin/qemu-system-x86_64 -name guest=win10machine,debug-threads=on -S
-object
secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-4-win10machine
/master-key.aes -machine pc-q35-4.2,accel=kvm,usb=off,vmport=off,dump-
guest-core=off -cpu Haswell-
noTSX,vme=on,ss=on,vmx=on,f16c=on,rdrand=on,hypervisor=on,arat=on,tsc-
adjust=on,umip=on,arch-capabilities=on,xsaveopt=on,pdpe1gb=on,abm=on
,skip-l1dfl-vmentry=on,hv-time,hv-relaxed,hv-vapic,hv-spinlocks=0x1fff
-m 4096 -overcommit mem-lock=off -smp 2,sockets=2,cores=1,threads=1
-uuid db88f5fc-47f0-439c-9192-a5991df2d8f8 -no-user-config -nodefaults
-chardev socket,id=charmonitor,fd=34,server,nowait -mon
chardev=charmonitor,id=monitor,mode=control -rtc
base=localtime,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-
hpet -no-shutdown -global ICH9-LPC.disable_s3=1 -global
ICH9-LPC.disable_s4=1 -boot strict=on -device pcie-root-
port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x2
-device pcie-root-
port,port=0x11,chassis=2,id=pci.2,bus=pcie.0,addr=0x2.0x1 -device pcie-
root-port,port=0x12,chassis=3,id=pci.3,bus=pcie.0,addr=0x2.0x2 -device
pcie-root-port,port=0x13,chassis=4,id=pci.4,bus=pcie.0,addr=0x2.0x3
-device pcie-root-
port,port=0x14,chassis=5,id=pci.5,bus=pcie.0,addr=0x2.0x4 -device qemu-
xhci,p2=15,p3=15,id=usb,bus=pci.2,addr=0x0 -device virtio-serial-pci,id
=virtio-serial0,bus=pci.3,addr=0x0 -blockdev
{"driver":"file","filename":"/home/user/nvme0n1/p1/win10.qcow2","node-
name":"libvirt-3-storage","auto-read-only":true,"discard":"unmap"}
-blockdev {"node-name":"libvirt-3-format","read-
only":false,"driver":"qcow2","file":"libvirt-3-storage","backing":null}
-device ide-hd,bus=ide.0,drive=libvirt-3-format,id=sata0-0-0,bootindex=1
-blockdev {"driver":"file","filename":"/home/user/nvme0n1/p1/dump1.qcow2
","node-name":"libvirt-2-storage","auto-read-
only":true,"discard":"unmap"} -blockdev {"node-name":"libvirt-2-format
","read-
only":false,"driver":"qcow2","file":"libvirt-2-storage","backing":null}
-device ide-hd,bus=ide.1,drive=libvirt-2-format,id=sata0-0-1 -blockdev
{"driver":"file","filename":"/home/user/nvme0n1/p1/dump2.qcow2","node-
name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"}
-blockdev {"node-name":"libvirt-1-format","read-
only":false,"driver":"qcow2","file":"libvirt-1-storage","backing":null}
-device ide-hd,bus=ide.2,drive=libvirt-1-format,id=sata0-0-2 -netdev
tap,fd=36,id=hostnet0 -device
e1000e,netdev=hostnet0,id=net0,mac=52:54:00:b5:3a:ca,bus=pci.1,addr=0x0
-chardev pty,id=charserial0 -device isa-
serial,chardev=charserial0,id=serial0 -chardev
spicevmc,id=charchannel0,name=vdagent -device virtserialport,bus=virtio-
serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0
-device usb-tablet,id=input0,bus=usb.0,port=1 -spice
port=5900,addr=127.0.0.1,disable-ticketing,image-compression=off
,seamless-migration=on -device qxl-
vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pcie.0,addr=0x1
-device ich9-intel-hda,id=sound0,bus=pcie.0,addr=0x1b -device hda-
duplex,id=sound0-codec0,bus=sound0.0,cad=0 -chardev
spicevmc,id=charredir0,name=usbredir -device usb-
redir,chardev=charredir0,id=redir0,bus=usb.0,port=2 -chardev
spicevmc,id=charredir1,name=usbredir -device usb-
redir,chardev=charredir1,id=redir1,bus=usb.0,port=3 -device virtio-
balloon-pci,id=balloon0,bus=pci.4,addr=0x0 -sandbox
on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny
-msg timestamp=on`

The qcow2 of the guest was created in VMM and the qcow2 that I can't
manipulate was created with (if I remember well) something like `qemu-
img convert /dev/sda2 -O image.qcow2` from a Windows physical machine

Format specific information:
    compat: 1.1
    lazy refcounts: false
    refcount bits: 16
    corrupt: false

W10

All the managers that i've tried were the same, but you can try for
example MiniTool or EaseUS

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https://bugs.launchpad.net/bugs/1872790

Title:
  empty qcow2

Status in QEMU:
  Incomplete

Bug description:
  I plugged multiple qcow2 to a Windows guest. On the Windows disk
  manager all disks are listed perfectly, with their data, their real
  space, I even can explore all files on the Explorer, all cool

  On third party disk manager (all of them), I only have the C:\ HDD who
  act normally, all the other plugged qcow2 are seen as fully
  unallocated, so I can't manipulate them

  I want to move some partitions, create others, but on Windows disk
  manager I can't extend or create partition and on third party I didn't
  see the partitions at all

  Even guestfs doesn't recognize any partition table `libguestfs: error:
  inspect_os: /dev/sda: not a partitioned device`

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