On 10.09.21 15:49, Julien Grall wrote:
On 10/09/2021 14:46, Juergen Gross wrote:On 10.09.21 15:22, Jan Beulich wrote:On 09.09.2021 08:27, Juergen Gross wrote:- Addition of a new stable hypercall ("get domain state") returning the following information: + domid of a domain having the bit set in above bitmap + state of that domain (existing, dying) + sequence count of that domainThe related bit is reset in the bitmap as a side effect of the call.What I'd like us to consider up front is whether xenstored is going to remain only entity interested in this kind of information. The entire design looks to leverage that there's only a single consumer in the system.Right. I'm just writing some RFC patches, and I have coded this interface to be usable only for the domain having VIRQ_DOM_EXC registered. The alternative (IMO) would have been to expose the domain-state bitmap to Xenstore (and/or other interested parties).If we do that, let's do in such way that guest_*_bit() helpers are not necessary because they are a massive hammer on Arm. This means the bitmap would have to be read-only for the domain.
I strongly prefer my current approach not needing a shared memory page. Juergen
OpenPGP_0xB0DE9DD628BF132F.asc
Description: OpenPGP public key
OpenPGP_signature
Description: OpenPGP digital signature
