libvirt opens kernel+initrd in read-write mode

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