Re: [Xen-devel] [PATCH 0/5] xen: better grant v2 support

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.08.17 at 11:19, <jgross@xxxxxxxx> wrote:
> Just some thoughts on that topic from my side:
> 
> This approach should be fine IMO for memory allocated while creating a
> domain. This is basically the same as a bare metal system where the BIOS
> needs some memory.
> 
> Memory allocated during the lifetime of a domain is a different problem:
> either you allow the domain to claim more memory as configured, or you
> have to reserve a more or less arbitrary amount of memory to be
> allocated later and eventually fail such allocations. I don't think this
> approach is acceptable.

Or an interrupt gets sent to the guest telling it that it should
nominate (balloon out or something similar) a page in order for
another of its operations to succeed. Of course that would be
limited to paravirtual operations (i.e. mostly hypercalls);
allocations done while emulating something could not be
handled this way.

Jan


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