[libvirt] [PATCH RFC 0/1] mdevctl: further config for vfio-ap

[Cornelia Huck]

On Thu, 6 Jun 2019 12:45:29 -0400
Matthew Rosato <mjrosato at linux.ibm.com> wrote:

> On 6/6/19 10:44 AM, Cornelia Huck wrote:
> > This patch adds a very rough implementation of additional config data
> > for mdev devices. The idea is to make it possible to specify some
> > type-specific key=value pairs in the config file for an mdev device.
> > If a device is started automatically, the device is stopped and restarted
> > after applying the config.
> > 
> > The code has still some problems, like not doing a lot of error handling
> > and being ugly in general; but most importantly, I can't really test it,
> > as I don't have the needed hardware. Feedback welcome; would be good to
> > know if the direction is sensible in general.  
> 
> Hi Connie,
> 
> This is very similar to what I was looking to do in zdev (config via
> key=value pairs), so I like your general approach.
> 
> I pulled your code and took it for a spin on an LPAR with access to
> crypto cards:
> 
> # mdevctl create-mdev `uuidgen` matrix vfio_ap-passthrough
> # mdevctl set-additional-config <uuid> ap_adapters=0x4,0x5
> # mdevctl set-additional-config <uuid> ap_domains=0x36
> # mdevctl set-additional-config <uuid> ap_control_domains=0x37
> 
> Assuming all valid inputs, this successfully creates the appropriate
> mdev and what looks to be a valid mdevctl.d entry.  A subsequent reboot
> successfully brings the same vfio_ap-passthrough device up again.

Cool, thanks for checking!

> 
> Matt
> 
> > 
> > Also available at
> > 
> > https://github.com/cohuck/mdevctl conf-data
> > 
> > Cornelia Huck (1):
> >   allow to specify additional config data
> > 
> >  mdevctl.libexec | 25 ++++++++++++++++++++++
> >  mdevctl.sbin    | 56 ++++++++++++++++++++++++++++++++++++++++++++++++-
> >  2 files changed, 80 insertions(+), 1 deletion(-)
> >   
>