On Thu, 3 Apr 2025, Jason Andryuk wrote: > To allocate the xenstore event channel and initialize the grant table > entry, the xenstore domid is neeed. A dom0 is created before the domUs, > so it is normally available through hardware_domain. With capabilities > and dom0less, the xenstore domain may not be created first. > > Keep the population of the page and HVM_PARAM_STORE_PFN in the normal > domain construction, but delay event channel creation and grant seeding > to after all domUs are created. HVM_PARAM_STORE_PFN now serves as > indication to setup xenstore since the device tree is no longer > immediately available. 0 means no xenstore. ~0ULL means legacy so only > the event channel needs setup, and any other value means to seed the > page. > > dom0 needs to set xs_domid when it is serving as the xenstore domain. > > The domain running xenstored needs to be the handler for VIRQ_DOM_EXC, > so set that as well - it otherwise defaults to hardware domain. > > Signed-off-by: Jason Andryuk <jason.andr...@amd.com>
Reviewed-by: Stefano Stabellini <sstabell...@kernel.org>
