libvirt opens kernel+initrd in read-write mode

[Olaf Hering]

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)
....

Olaf
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