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

[Jan Beulich <jbeulich@xxxxxxxx>]

On 29.08.2019 12:20, Paul Durrant wrote:
>> -----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?

This one, I think, yes, or the value it gets defaulted to when not set
in the guest config file.

Jan

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