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Re: [PATCH 0/4] XSM changes for split hardware / control domain
- To: Jason Andryuk <jason.andryuk@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 11 Jun 2025 15:28:17 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Christian Lindig <christian.lindig@xxxxxxxxxx>, David Scott <dave@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 11 Jun 2025 13:28:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.06.2025 00:57, Jason Andryuk wrote:
> Theses are the broad changes needed for a split hardware / control
> domain.
>
> An earlier posting gave device_model privileges to hardware domain. For
> this posting, it was split out into a new capability. This way the
> operator can choose where to run the device models without making the
> hardware domain have the permissions.
>
> The first patch add XSM_HW_PRIV for the hardware hypercalls. Unlike the
> first posting, the control domain can call these hypercalls even though
> it doesn't really make sense. The idea was to keep the control domain
> all powerful from an XSM perspective.
>
> SILO is changed to allow control, hardwware or xenstore to service
> domUs. Xenstore and hardware will use grants for PV interfaces.
> Control wouldn't typically provide PV interfaces to domUs, but it is
> given the permision to do so. Again, to keep control all powerful.
>
> xsm/dummy: Allow hwdom SYSCTL_readconsole/physinfo this is not strictly
> needed. xenconsoled could read Xen's dmesg. If it's in hwdom, then
> that permission would be required. SYSCTL_physinfo is mainly to silence
> xl messages, which are mostly cosmetic.
>
> Jason Andryuk (4):
> xen/xsm: Add XSM_HW_PRIV
> xsm/silo: Support hwdom/control domains
> xen: Add DOMAIN_CAPS_DEVICE_MODEL & XEN_DOMCTL_CDF_device_model
> xsm/dummy: Allow hwdom SYSCTL_readconsole/physinfo
Overall I can't help the impression that this level of disaggregation simply
requires the use of Flask.
Jan
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