Re: [PATCH v2 03/17] xen: Add DOMAIN_CAPS_DEVICE_MODEL & XEN_DOMCTL_CDF_device_model

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Wed, 16 Jul 2025, Jason Andryuk wrote:
> To add more flexibility in system configuration add the new
> DOMAIN_CAPS_DEVICE_MODEL flag and XEN_DOMCTL_CDF_device_model.
> 
> Thie new flag corresponds to allowing XSM_DM_PRIV for the domain.  This
> will enable running device model emulators (QEMU) from the assigned
> domain for multiple target domains.
> 
> Stubdoms assign target allowing the stubdom to serve as the device
> model for a single domain.  This new flag allows the single domain to
> provide emulators for multiple guests.
> 
> The specific scenario is a disaggregated system with the hardware domain
> providing device models for multiple guest domains.
> 
> This permission is also enough to run xenconsoled in the hardware
> domain.  This is a byproduct of getdomaininfo being available.  The
> grant permissions are also configured for the console page.
> 
> The OCaml code needs the flag added in as well.
> 
> Signed-off-by: Jason Andryuk <jason.andryuk@xxxxxxx>
> Acked-by: Christian Lindig <christian.lindig@xxxxxxxxx>

Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>