libvirt opens kernel+initrd in read-write mode

[Michal Privoznik]

On 7/9/20 4:32 PM, Olaf Hering wrote:
> Is there a reason why libvirtd v6.5.0 opens kernel+initrd in mode RW?
> 'virsh start vm' fails of both are on a read-only filesystem.
> Not sure if this ever worked before.
> 
> <domain type='kvm'>
>    <os>
>      <type arch='x86_64' machine='pc-i440fx-5.1'>hvm</type>
>      <kernel>/path/to/kernel</kernel>
>      <initrd>/path/to/initrd</initrd>
>      <cmdline>net.ifnames=0 console=ttyS0,115200 linemode=1 panic=9 start_shell</cmdline>
>      <boot dev='hd'/>
>    </os>
> </domain>
> 
> ....
> 13111 stat("/path/to/initrd", {st_mode=S_IFREG|0755, st_size=119207064, ...}) = 0
> 13111 openat(AT_FDCWD, "/path/to/initrd", O_RDWR) = -1 EROFS (Read-only file system)
> ....
> 

Hey,

do you see an actual libvirt error? I think this may come from 
secdrivers trying to remember the original owner of kernel/initrd files.

If you set remember_owner=0 in /etc/libvirt/qemu.conf (and restart 
libvirtd) then does it fix your problem?

Michal