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[Bug 1913012] Re: Installed firmware descriptor files contain (invalid)

From: Alain Kalker
Subject: [Bug 1913012] Re: Installed firmware descriptor files contain (invalid) relative paths
Date: Mon, 25 Jan 2021 08:28:50 -0000

Please disregard the `# Test a coworkaround` stuff in comment #1, bad
copypasta, too late at night ;-)

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  Installed firmware descriptor files contain (invalid) relative paths

Status in QEMU:

Bug description:
  After building and installing QEMU, the resulting installed firmware
  descriptor files contain relative paths for their `mapping.filename`
  properties. These relative paths are causing errors when using tools
  based on `libvirt` like `virt-install`, resulting in the inability to
  configure new VMs which reference these firmware descriptors.

  # QEMU version
  $ qemu-system-x86_64 -version
  QEMU emulator version 5.2.0

  (I've also reproduced the issue with QEMU built from Git master @
  v5.2.0-1300-g0e32462630, see next comment.)

  # OS version
  Void Linux x86_64 (glibc)

  Steps to reproduce (with results on my system):

  # Verify the symptom

  $ virt-install --boot firmware=efi --disk none --memory 2048
  Using default --name vm4
  WARNING  No operating system detected, VM performance may suffer. Specify an 
OS with --os-variant for optimal results.

  Starting install...
  ERROR    Failed to open file 'share/qemu/edk2-i386-vars.fd': No such file or 
  Domain installation does not appear to have been successful.
  If it was, you can restart your domain by running:
    virsh --connect qemu:///session start vm4
  otherwise, please restart your installation.

  # Verify that the file does exist on the system and is accessible

  $ ls -l /usr/share/qemu/edk2-i386-vars.fd
  -rw-r--r-- 1 root root 540672 12 dec 18:47 /usr/share/qemu/edk2-i386-vars.fd

  # Verify most likely cause

  $ grep filename /usr/share/qemu/firmware/*i386*.json
  /usr/share/qemu/firmware/50-edk2-i386-secure.json:            "filename": 
  /usr/share/qemu/firmware/50-edk2-i386-secure.json:            "filename": 
  /usr/share/qemu/firmware/60-edk2-i386.json:            "filename": 
  /usr/share/qemu/firmware/60-edk2-i386.json:            "filename": 

  Note that all the paths are relative and are missing <prefix>, i.e.

  # Workaround

  Manually editing the firmware descriptor files in
  `/usr/share/qemu/firmware` to contain full absolute paths to the
  firmware blobs resolves the issue:

  $ sudo sed -i.bak -e 's,"share/qemu/,"/usr/share/qemu/,' 
  $ virt-install --boot firmware=efi --disk none --memory 2048
  [...VM boots normally...]

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