Re: [pve-devel] [PATCH qemu-server 18/31] blockdev: add change_medium() helper

["DERUMIER, Alexandre via pve-devel" <pve-devel@lists.proxmox.com>]

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From: "DERUMIER, Alexandre" <alexandre.derumier@groupe-cyllene.com>
To: "pve-devel@lists.proxmox.com" <pve-devel@lists.proxmox.com>, "f.gruenbichler@proxmox.com" <f.gruenbichler@proxmox.com>
Subject: Re: [pve-devel] [PATCH qemu-server 18/31] blockdev: add change_medium() helper
Date: Tue, 1 Jul 2025 10:01:47 +0000
Message-ID: <5b5e89fd824c431a57b8fcf9a5eb6cf30aeb24e3.camel@groupe-cyllene.com>

>>if you start a VM with cdrom=none, throttle group object is
>>generated:

sorry, I wanted to said : the throttle top node (which is using the
throttle group)

I think it's just related to blockdev-medium-change, as we can't
specify the node chain, qemu is simply autocreating a format+file node
with autogenerated node-name, and attach it to the top.

here the blockdev dump after going from none -> iso

  ide2 => {
    device => "",
    inserted => {
      active => $VAR1->{ide0}{inserted}{active},
      backing_file_depth => 0,
      bps => 0,
      bps_rd => 0,
      bps_wr => 0,
      cache => {
        direct => $VAR1->{ide0}{inserted}{cache}{direct},
        "no-flush" => $VAR1->{ide0}{inserted}{cache}{direct},
        writeback => $VAR1->{ide0}{inserted}{active},
      },
      detect_zeroes => "off",
      drv => "raw",
      encrypted => $VAR1->{ide0}{inserted}{cache}{direct},
      file => "/var/lib/vz/template/iso/debian-12.5.0-amd64-
netinst.iso",
      image => {
        "actual-size" => 659554304,
        "dirty-flag" => $VAR1->{ide0}{inserted}{cache}{direct},
        filename => "/var/lib/vz/template/iso/isofile.iso",
        format => "raw",
        "virtual-size" => 659554304,
      },
      iops => 0,
      iops_rd => 0,
      iops_wr => 0,
      "node-name" => "#block127",
      ro => $VAR1->{ide0}{inserted}{active},
      write_threshold => 0,
    },
    "io-status" => "ok",
    locked => $VAR1->{ide0}{inserted}{active},
    qdev => "ide2",
    removable => $VAR1->{ide0}{inserted}{active},
    tray_open => $VAR1->{ide0}{inserted}{cache}{direct},
    type => "unknown",
  },


>>@alexandre are you testing with all three patch series applied (qemu-
>>server, pve-qemu-kvm, pve-storage)?

yes sure !

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