From: Ján Tomko <jtomko(a)redhat.com&gt; In that case, libvirtd cannot set it on the command line because virtiofsd is not launched by libvirt. https://issues.redhat.com/browse/RHEL-87522 Signed-off-by: Ján Tomko <jtomko(a)redhat.com&gt; --- src/qemu/qemu_validate.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c index 87588024ce..013ff14d75 100644 --- a/src/qemu/qemu_validate.c +++ b/src/qemu/qemu_validate.c @@ -4684,6 +4684,11 @@ qemuValidateDomainDeviceDefFS(virDomainFSDef *fs, _("virtiofs does not support wrpolicy")); return -1; } + if (fs->readonly) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", + _("readonly mode cannot be set for extrenally started virtiofsd")); + return -1; + } } if (fs->model != VIR_DOMAIN_FS_MODEL_DEFAULT) { -- 2.49.0