Re: [Xen-devel] PV Shim ballooning

[Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>]

On 11/02/2020 16:42, Roger Pau Monné wrote:
> On Tue, Feb 11, 2020 at 04:29:36PM +0000, Igor Druzhinin wrote:
>> Agree. But as I said I'm not aware of any guest that violates the
>> invariant of decrease_reservation() being the last call.
> 
> Maybe we could piggyback on whether a page is removed from the domain
> domheap and use that as a signal that the page should be ballooned
> out?
> 
> There's already an arch_free_heap_page that's called when a page is
> removed from a domain, which might be suitable for this. It would
> however imply making an hypercall for every page to be ballooned out.

I tested that - doesn't work - too many hypercalls make ballooning take
ages. This simply cannot be done on page-by-page basis.

Igor

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