Re: [Xen-devel] xl: insufficient ballooning when starting certain guests

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 29.10.15 at 18:01, <wei.liu2@xxxxxxxxxx> wrote:
> On Thu, Oct 29, 2015 at 10:08:02AM -0600, Jan Beulich wrote:
>> >>> On 29.10.15 at 16:36, <wei.liu2@xxxxxxxxxx> wrote:
>> > What does the hypervisor do when PTs are shared but it still hits the
>> > boundary? I presume the current default value never triggers such
>> > situation?
>> 
>> Not sure what you mean here - we're talking about creating the
>> guest, and the failure thereof due to not enough memory getting
>> made available. If the tool stack estimate is appropriate, then we
> 
> Just to make sure we're one the same page, by "memory" you mean hap
> pool, right?

The IOMMU code doesn't actually allocate from that pool, i.e. the
memory just needs to be available, but not added to the hap pool.

> As for the channel for passing that bit of information to toolstack, I'm
> not sure about what to do. If sysctl needs to be stable we need to think
> a bit more about that. If not, I don't think we need to support stable
> interface for sysctl so I won't care too much how it's done actually.

No, sysctl (just like domctl) doesn't need to be stable.

Jan


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