On Wed, Apr 07, 2021 at 09:17:36AM +0200, Peter Krempa wrote: > On Tue, Apr 06, 2021 at 16:31:32 +0100, Daniel Berrange wrote: > > PCI devices can be associated with a unique integer index that is > > exposed via ACPI. In Linux OS with systemd, this value is used for > > provide a NIC device naming scheme that is stable across changes > > in PCI slot configuration. > > > > Signed-off-by: Daniel P. Berrangé <berra...@redhat.com> > > --- > > docs/formatdomain.rst | 6 +++ > > docs/schemas/domaincommon.rng | 73 +++++++++++++++++++++++++++++++++++ > > src/conf/device_conf.h | 3 ++ > > src/conf/domain_conf.c | 12 ++++++ > > 4 files changed, 94 insertions(+) > > > > diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst > > index 7ba32ea9c1..5db0aac77a 100644 > > --- a/docs/formatdomain.rst > > +++ b/docs/formatdomain.rst > > @@ -4363,6 +4363,7 @@ Network interfaces > > <mac address='52:54:00:5d:c7:9e'/> > > <boot order='1'/> > > <rom bar='off'/> > > + <acpi index='4'/> > > </interface> > > </devices> > > ... > > @@ -4389,6 +4390,11 @@ when it's in the reserved VMware range by adding a > > ``type="static"`` attribute > > to the ``<mac/>`` element. Note that this attribute is useless if the > > provided > > MAC address is outside of the reserved VMWare ranges. > > > > +:since:`Since 7.3.0`, one can set the ACPI index against network > > interfaces. > > +With some operating systems (eg Linux with systemd), the ACPI index is used > > +to provide network interface device naming, that is stable across changes > > +in PCI addresses assigned to the device. > > Any range limits or uniqueness requirements worth mentioning?
Yes, its required to be unique and below (16 * 1024 - 1) because for some reason QEMU chose to artificially limit its value to match systemd's limit. This is a bit dubious IMHO, as the host should not enforce policy for things that are decided by the guest. Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
