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Re: [Xen-devel] [PATCH] x86/libxl: choose a sane default for HAP
- To: Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 5 Sep 2019 11:34:00 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, WeiLiu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, GeorgeDunlap <George.Dunlap@xxxxxxxxxxxxx>, TimDeegan <tim@xxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Paul Durrant <Paul.Durrant@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 05 Sep 2019 10:34:08 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 05/09/2019 11:32, Jan Beulich wrote:
> On 05.09.2019 12:01, Roger Pau Monné wrote:
>> On Thu, Sep 05, 2019 at 11:52:59AM +0200, Jan Beulich wrote:
>>> On 05.09.2019 11:34, Roger Pau Monne wrote:
>>>> Current libxl code will always enable Hardware Assisted Paging (HAP),
>>>> expecting that the hypervisor will fallback to shadow if HAP is not
>>>> available. With the changes to the domain builder that's not the case
>>>> any longer, and the hypervisor will raise an error if HAP is not
>>>> available instead of silently falling back to shadow.
>>> Would it really be much more involved than the change here to restore
>>> silent defaulting to shadow?
>> But that would mean that a user having selected hap=1 on the config
>> file would get silently defaulted to shadow, which is wrong IMO.
> Since you and Andrew agree, so be it. Personally I'd like it better
> if "hap=1" didn't prevent a domain from starting on a HAP-incapable
> host. I wouldn't mind a warning though.
Behaviour like that could be arranged in libxl, which now has all the
requisite pieces.
What I'm not happy with is xc_domain_create() asking for a HAP domain
and getting silently getting a shadow one.
~Andrew
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