On Mon, Dec 20, 2021 at 04:54:25PM -0800, Stefano Stabellini wrote: > On Tue, 14 Dec 2021, Oleksii Moisieiev wrote: > > This enumeration sets SCI type for the domain. Currently there is > > two possible options: either 'none' or 'scmi_smc'. > > > > 'none' is the default value and it disables SCI support at all. > > > > 'scmi_smc' enables access to the Firmware from the domains using SCMI > > protocol and SMC as transport. > > > > Signed-off-by: Oleksii Moisieiev <oleksii_moisie...@epam.com> > > --- > > docs/man/xl.cfg.5.pod.in | 22 ++++++++++++++++++++++ > > tools/include/libxl.h | 5 +++++ > > tools/libs/light/libxl_types.idl | 6 ++++++ > > tools/xl/xl_parse.c | 9 +++++++++ > > 4 files changed, 42 insertions(+) > > > > diff --git a/docs/man/xl.cfg.5.pod.in b/docs/man/xl.cfg.5.pod.in > > index b98d161398..92d0593875 100644 > > --- a/docs/man/xl.cfg.5.pod.in > > +++ b/docs/man/xl.cfg.5.pod.in > > @@ -1614,6 +1614,28 @@ This feature is a B<technology preview>. > > > > =back > > > > +=item B<sci="STRING"> > > + > > +B<Arm only> Set SCI type for the guest. SCI is System Control Protocol - > > +allows domain to manage various functions that are provided by HW platform. > > + > > +=over 4 > > + > > +=item B<none> > > + > > +Don't allow guest to use SCI if present on the platform. This is the > > default > > +value. > > + > > +=item B<scmi_smc> > > + > > +Enables SCMI-SMC support for the guest. SCMI is System Control Management > > +Inferface - allows domain to manage various functions that are provided by > > HW > > +platform, such as clocks, resets and power-domains. Xen will mediate > > access to > > +clocks, power-domains and resets between Domains and ATF. Disabled by > > default. > > +SMC is used as transport. > > Would it make sense to actually enable SCMI-SMC support for the guest by > default if the guest has any devices directly assigned?
Hi Stefano, Previously we discussed with Oleksandr about introducing new dom.cfg parameter, such as scidev[] lists all sci related nodes, which will help to avoid extra domctl calls. But there is still a question how mediator types should be set for different domains? I know currently system supports only one mediator type, but different implementation should be also possible. For example, if we have to start dom0 and domd using scmi_mailbox mediator and domU using scmi_smc, because our system supports only 2 mailboxes. Best regards, Oleksii.
