Re: [libvirt PATCH 5/5] Add bios path for loongarch

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On Thu, Dec 14, 2023 at 02:08:49PM +0800, xianglai li wrote:
> +++ b/src/qemu/qemu_conf.c
> @@ -93,7 +93,8 @@ VIR_ONCE_GLOBAL_INIT(virQEMUConfig);
>      "/usr/share/OVMF/OVMF_CODE.fd:/usr/share/OVMF/OVMF_VARS.fd:" \
>      "/usr/share/OVMF/OVMF_CODE.secboot.fd:/usr/share/OVMF/OVMF_VARS.fd:" \
>      "/usr/share/AAVMF/AAVMF_CODE.fd:/usr/share/AAVMF/AAVMF_VARS.fd:" \
> -    "/usr/share/AAVMF/AAVMF32_CODE.fd:/usr/share/AAVMF/AAVMF32_VARS.fd"
> +    "/usr/share/AAVMF/AAVMF32_CODE.fd:/usr/share/AAVMF/AAVMF32_VARS.fd:" \
> +    "/usr/share/qemu/edk2-loongarch64-code.fd:/usr/share/qemu/edk2-loongarch64-vars.fd"
>  #endif

We definitely don't want this :)

The hard-coded CODE:VARS pairs are considered a legacy mechanism at
this point, and we're no longer adding to them. If you try to pass a
custom value at build time, a warning will be raised.

The way firmware is configured these days is through firmware
descriptor files. See src/qemu/qemu_firmware* and tests/qemufirmware*
for additional information, but the short version is that you want
your edk2 package to include something like this:

  # /usr/share/qemu/firmware/50-edk2-loongarch64.json
  {
    "interface-types": [
      "uefi"
    ],
    "mapping": {
      "device": "flash",
      "mode" : "split",
      "executable": {
        "filename": "/usr/share/edk2/loongarch64/QEMU_CODE.fd",
        "format": "raw"
      },
      "nvram-template": {
        "filename": "/usr/share/edk2/loongarch64/QEMU_VARS.fd",
        "format": "raw"
      }
    },
    "targets": [
      {
        "architecture": "loongarch64",
        "machines": [
          "virt",
          "virt-*"
        ]
      }
    ]
  }

Once you have that, libvirt will automatically pick up the correct
firmware when the VM is configured with

  <os firmware='efi'>

Same as any other architecture, no custom entries needed.

-- 
Andrea Bolognani / Red Hat / Virtualization
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