On 10/13/20 2:25 PM, daggs wrote:
Greetings Michal,
Sent: Tuesday, October 13, 2020 at 2:51 PM
From: "Michal Privoznik" <mprivozn@xxxxxxxxxx>
To: "daggs" <daggs@xxxxxxx>, libvirt-users@xxxxxxxxxx
Subject: Re: unable to find any master var store for loader error
Hey,
I'll paste the interesting part of domain XML here so that it doesn't
get lost:
<os>
<type arch='x86_64' machine='pc-q35-5.0'>hvm</type>
<loader readonly='yes'
type='pflash'>/usr/share/edk2-ovmf/OVMF_CODE.fd</loader>
<nvram>/var/lib/libvirt/qemu/nvram/vm1_VARS.fd</nvram>
<boot dev='hd'/>
</os>
And then in qemu.conf you define the pair:
nvram = [
"/usr/share/edk2-ovmf/OVMF_CODE.fd:/usr/share/edk2-ovmf/OVMF_VARS.fd",
"/usr/share/edk2-ovmf/OVMF_CODE.secboot.fd:/usr/share/edk2-ovmf/OVMF_VARS.secboot.fd"
]
But as the comment in qemu.conf (just above your line) says, this is
ignored if FW metadata files exist which is exactly your case and this bug:
https://bugzilla.redhat.com/show_bug.cgi?id=1763477
For your convenience you can switch to <os firmware='efi'/> (the
<loader/> element will be removed automatically) or if you insist on
using the old style then provide @template attribute to <nvram/>:
<nvram
template="/usr/share/edk2-ovmf/OVMF_CODE.fd">/var/lib/libvirt/qemu/nvram/vm1_VARS.fd</nvram>
There is an internal list that is still consulted when finding matching
_VARS fails, but your path is not on it:
https://gitlab.com/libvirt/libvirt/-/blob/master/src/qemu/qemu_conf.c#L98
But it exists mostly to give distros enough time to switch to FW
descriptors.
Michal
thanks for the detailed explanation, I wanted to be sure I understand. the following is needed to be done:
1. replace this:
<os>
<type arch='x86_64' machine='pc-q35-5.0'>hvm</type>
<loader readonly='yes' type='pflash'>/usr/share/edk2-ovmf/OVMF_CODE.fd</loader>
<nvram>/var/lib/libvirt/qemu/nvram/vm1_VARS.fd</nvram>
<boot dev='hd'/>
</os>
to this:
<os firmware='efi'/>
<type arch='x86_64' machine='pc-q35-5.0'>hvm</type>
<boot dev='hd'/>
</os>
Here, nvram will be generated, but if you want some other path than
libvirt would generate you can provide it under <nvram/>. Yes. But
you're using the default path anyway.
2. patch qemu_conf.c to include the custom paths of my fd files?
There is a third option. Save the following under
/etc/qemu/firmware/50-my-ovmf.json:
{
"description": "UEFI firmware for x86_64",
"interface-types": [
"uefi"
],
"mapping": {
"device": "flash",
"executable": {
"filename": "/usr/share/edk2-ovmf/OVMF_CODE.fd",
"format": "raw"
},
"nvram-template": {
"filename": "/usr/share/edk2-ovmf/OVMF_VARS.fd",
"format": "raw"
}
},
"targets": [
{
"architecture": "x86_64",
"machines": [
"pc-i440fx-*",
"pc-q35-*"
]
}
],
"features": [
"acpi-s3",
"amd-sev",
"verbose-dynamic"
],
"tags": [
]
}
Michal
