Re: [Xen-devel] [PATCH 3/6] remove late (on-demand) construction of IOMMU page tables

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Jan Beulich <jbeulich@xxxxxxxx>
> Sent: 29 August 2019 10:52
> To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>
> Cc: 'JulienGrall' <julien.grall@xxxxxxx>; 'Alexandru Isaila' 
> <aisaila@xxxxxxxxxxxxxxx>; 'Petre
> Pircalabu' <ppircalabu@xxxxxxxxxxxxxxx>; 'Razvan Cojocaru' 
> <rcojocaru@xxxxxxxxxxxxxxx>; Andrew Cooper
> <Andrew.Cooper3@xxxxxxxxxx>; George Dunlap <George.Dunlap@xxxxxxxxxx>; Ian 
> Jackson
> <Ian.Jackson@xxxxxxxxxx>; Roger Pau Monne <roger.pau@xxxxxxxxxx>; 
> 'VolodymyrBabchuk'
> <Volodymyr_Babchuk@xxxxxxxx>; 'Stefano Stabellini' <sstabellini@xxxxxxxxxx>; 
> 'xen-
> devel@xxxxxxxxxxxxxxxxxxxx' <xen-devel@xxxxxxxxxxxxxxxxxxxx>; 'Konrad 
> Rzeszutek Wilk'
> <konrad.wilk@xxxxxxxxxx>; 'Tamas K Lengyel' <tamas@xxxxxxxxxxxxx>; Tim 
> (Xen.org) <tim@xxxxxxx>; 'Wei
> Liu' <wl@xxxxxxx>
> Subject: Re: [Xen-devel] [PATCH 3/6] remove late (on-demand) construction of 
> IOMMU page tables
> 
> On 29.08.2019 11:33, Paul Durrant wrote:
> > TBH I've seen sufficient numbers of domain create failures when using
> > auto-ballooning that I stopped using it some time ago (besides the fact
> > that it's slow). If you're happy with the simplistic
> > double-the-page-table-reservation calculation then I can add that but
> > IMO it would be better to add another patch to just remove auto-ballooning.
> 
> I'd not be overly happy, but I could live with this. But this needs
> consent by others, not the least the tool stack maintainers.
> 

Ok. I'll deal with that later. Looking again though, I'm not sure what you mean 
by 'the amount reserved for page tables'? Do you mean 'shadow_memkb' or 
something else?

  Paul
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