[Qemu-devel] [Bug 1523246] [NEW] Cannot TRIM with VirtIO

[Qemu-devel] [Bug 1523246] [NEW] Cannot TRIM with VirtIO

[David Manouchehri]

Public bug reported:

When model=virtio is used, TRIM is not supported.

# mount -o discard /dev/vda4 /mnt
# mount | tail -1
/dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
# fstrim /mnt/
fstrim: /mnt/: the discard operation is not supported

Booting without model=virtio allows using TRIM (in Windows as well).

Full QEMU line:

qemu-system-x86_64 -enable-kvm -cpu host -bios
/usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
-net nic,model=virtio -net user -drive discard=unmap,detect-
zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: trim virtio windows

** Attachment added: "2015-12-06-14:04:03-screenshot.png"
   https://bugs.launchpad.net/bugs/1523246/+attachment/4530502/+files/2015-12-06-14%3A04%3A03-screenshot.png

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Title:
  Cannot TRIM with VirtIO

Status in QEMU:
  New

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Cannot TRIM with VirtIO

[David Manouchehri]

Ideally there should be a warning if a user gives discard=unmap and
isn't using the SCSI bus. Using the following options allows the guest
to detect the drive as a thinly provisioned drive.

-drive discard=unmap,detect-
zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=none,id=hd
-device virtio-scsi-pci,id=scsi -device scsi-hd,drive=hd

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Title:
  Cannot TRIM with VirtIO

Status in QEMU:
  New

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Cannot TRIM with VirtIO

[David Manouchehri]

** Attachment added: "2015-12-06-19:20:59-screenshot.png"
   https://bugs.launchpad.net/qemu/+bug/1523246/+attachment/4530556/+files/2015-12-06-19%3A20%3A59-screenshot.png

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Title:
  Cannot TRIM with VirtIO

Status in QEMU:
  New

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Cannot TRIM with VirtIO

[Коренберг Марк]

Virtio will never support discard requests. Please use virtio-scsi.

So, please rename bug to "Feature request: Refuse to operate if virtio +
discard is requested"

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Title:
  Cannot TRIM with VirtIO

Status in QEMU:
  New

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Cannot TRIM with VirtIO

[Paolo Bonzini]

** Changed in: qemu
       Status: New => Confirmed

** Changed in: qemu
   Importance: Undecided => Wishlist

** Summary changed:

- Cannot TRIM with VirtIO
+ VirtIO does not support TRIM

** Summary changed:

- VirtIO does not support TRIM
+ Virtio-blk does not support TRIM

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Confirmed

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Rustam Abdullaev]

> Virtio will never support discard requests.

 - what is that?

> Please use virtio-scsi.

 - in some tests, SCSI emulation appears 7 times slower than the
paravirtualized bus.

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Confirmed

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Mike Mol]

> Virtio will never support discard requests.

Why? If you don't want to write a treatise on the subject, perhaps point
at an LWN article or LKML thread where that conclusion was discussed or
reached.

> So, please rename bug to "Feature request: Refuse to operate if virtio
+ discard is requested"

Uh, if the feature as requested will never be satisfied, WONTFIX it and
create a feature that could be satisfied.  Or WONTFIX it and take no
further action. Either way, the status of things would be much clearer
to use poor schmucks who land here googling the issue.

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Confirmed

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Mike Mol]

discard support for virtio-blk is on the QEMU TODO list:

http://wiki.qemu-project.org/ToDo/Block#virtio-
blk_discard_support_.5BPeter_Lieven.5D

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Confirmed

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Mike Mol]

Granted, it's been there since October of 2014. http://wiki.qemu-
project.org/index.php?title=ToDo/Block&oldid=4410#virtio-
blk_discard_support_.5BPeter_Lieven.5D

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Confirmed

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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Re: [Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Jack Wang]

Latest effort was one month ago:

https://patchwork.kernel.org/patch/9645537/

2017-04-19 14:08 GMT+02:00 Mike Mol <mikemol@gmail.com>:
> discard support for virtio-blk is on the QEMU TODO list:
>
> http://wiki.qemu-project.org/ToDo/Block#virtio-
> blk_discard_support_.5BPeter_Lieven.5D
>
> --
> You received this bug notification because you are a member of qemu-
> devel-ml, which is subscribed to QEMU.
> https://bugs.launchpad.net/bugs/1523246
>
> Title:
>   Virtio-blk does not support TRIM
>
> Status in QEMU:
>   Confirmed
>
> Bug description:
>   When model=virtio is used, TRIM is not supported.
>
>   # mount -o discard /dev/vda4 /mnt
>   # mount | tail -1
>   /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
>   # fstrim /mnt/
>   fstrim: /mnt/: the discard operation is not supported
>
>   Booting without model=virtio allows using TRIM (in Windows as well).
>
>   Full QEMU line:
>
>   qemu-system-x86_64 -enable-kvm -cpu host -bios
>   /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
>   -net nic,model=virtio -net user -drive discard=unmap,detect-
>   zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qemu/+bug/1523246/+subscriptions
>

[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[James Harvey]

I believe this feature was just merged by Linus about a week ago, and is
in linux 5.0-rc1:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d548e65904ae43b0637d200a2441fc94e0589c30

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Confirmed

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Stefan Hajnoczi]

While the Linux virtio-blk guest driver now supports discard and write
zeroes, QEMU's virtio-blk device emulation does not support it yet.

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Confirmed

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Thomas Huth]

The DISCARD feature has now been implemented in QEMU, too:
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=37b06f8d46fe602e630e4

** Changed in: qemu
       Status: Confirmed => Fix Committed

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Fix Committed

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Thomas Huth]

** Changed in: qemu
       Status: Fix Committed => Fix Released

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Fix Released

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Bug 1523246] Re: Virtio-blk does not support TRIM

[mohammadreza nasrabadi]

On which version of qemu the discard option is supported?

I have emulated a VM with below qemu options related to disk type:

-drive file=disk.img,if=none,id=disk0,l2-cache-
size=8M,format=qcow2,discard=on,detect-zeroes=unmap,aio=io_uring -device
virtio-blk-pci,drive=disk0,scsi=off,bootindex=2

the disk file on the host side is located on xfs mountpoint on RAID
level 10 array.

After I downloaded a file with 1GB size on the guest OS, I saw the size
of the disk file on the host has been increased as well.

But when I delete the downloaded file and issue fstrim --all -v command,
the disk file on host has not been decreased.

The version of qemu I'm using is 5.2.0

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Fix Released

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Bug 1523246] Re: Virtio-blk does not support TRIM

[Thomas Huth]

$ git tag --contains 37b06f8d46fe602e630e4 | grep ^v | sort | head -n1
v4.0.0

How did you check the size of the file? It might appear bigger than it
is due to sparse blocks.

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Fix Released

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Bug 1523246] Re: Virtio-blk does not support TRIM

[mohammadreza nasrabadi]

I've checked the size of disk file with ls -alh  and du --apparent-size
commands

I downloaded the 1G size file 5 times to make sure about sparse blocks
issue, but the problem still exists

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https://bugs.launchpad.net/bugs/1523246

Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Fix Released

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Bug 1523246] Re: Virtio-blk does not support TRIM

[Thomas Huth]

I think you should check with "du" but without "--apparent-size" since
that parameter counts the sparse blocks, too. See e.g.:

$ truncate -s 10M test.dat
$ ls -alh test.dat 
-rw-rw-r--. 1 root root 10M Dec 12 14:31 test.dat
$ du -sh --apparent-size test.dat 
10M	test.dat
$ du -sh test.dat 
0	test.dat

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1523246

Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Fix Released

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1523246/+subscriptions

[Bug 1523246] Re: Virtio-blk does not support TRIM

[mohammadreza nasrabadi]

thanks. so now my question is that are these sparsed blocks rewritable? I mean after deletion of a file and downloading again, will these files be stored on the sparsed blocks or the number of starting block for write operation will be after the number of latest sparsed block?

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1523246

Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Fix Released

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1523246/+subscriptions