[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [PATCH 03/10] xen/arm: introduce PGC_reserved

On 20.05.2021 10:59, Julien Grall wrote:
> On 20/05/2021 09:40, Penny Zheng wrote:
>> Oh, Second thought on this.
>> And I think you are referring to balloon in/out here, hmm, also, like
> Yes I am referring to balloon in/out.
>> I replied there:
>> "For issues on ballooning out or in, it is not supported here.
> So long you are not using the solution in prod then you are fine (see 
> below)... But then we should make clear this feature is a tech preview.
>> Domain on Static Allocation and 1:1 direct-map are all based on
>> dom0-less right now, so no PV, grant table, event channel, etc, considered.
>> Right now, it only supports device got passthrough into the guest."
> So we are not creating the hypervisor node in the DT for dom0less domU. 
> However, the hypercalls are still accessible by a domU if it really
> wants to use them.
> Therefore, a guest can easily mess up with your static configuration and 
> predictability.
> IMHO, this is a must to solve before "static memory" can be used in 
> production.

I'm having trouble seeing why it can't be addressed right away: Such
guests can balloon in only after they've ballooned out some pages,
and such balloon-in requests would be satisfied from the same static
memory that is associated by the guest anyway.




Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.