[Bug 1863710] [NEW] qemu 4.2 does not process discard(trim) commands

[Chris S.]

Public bug reported:

I'm using Arch Linux with qemu 4.2 and blktrace to monitor discard
commands as they are sent to the hardware.  Blktrace shows nothing as
the VM is trimming the SSDs.

I downgraded to qemu 4.1.1 and blktrace shows lots of discard commands
as the VM is trimming.

Kernel version is 5.5.4.

Attached is the libvirt xml.

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "win10-real.xml"
   
https://bugs.launchpad.net/bugs/1863710/+attachment/5329158/+files/win10-real.xml

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https://bugs.launchpad.net/bugs/1863710

Title:
  qemu 4.2 does not process discard(trim) commands

Status in QEMU:
  New

Bug description:
  I'm using Arch Linux with qemu 4.2 and blktrace to monitor discard
  commands as they are sent to the hardware.  Blktrace shows nothing as
  the VM is trimming the SSDs.

  I downgraded to qemu 4.1.1 and blktrace shows lots of discard commands
  as the VM is trimming.

  Kernel version is 5.5.4.

  Attached is the libvirt xml.

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