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Re: [Xen-devel] [PATCH v2 00/14] Add VMX TSC scaling support
- To: "Egger, Christoph" <chegger@xxxxxxxxx>
- From: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
- Date: Mon, 7 Dec 2015 18:16:24 +0800
- Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Keir Fraser <keir@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxx, Aravind Gopalakrishnan <Aravind.Gopalakrishnan@xxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Delivery-date: Mon, 07 Dec 2015 10:16:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
- Mail-followup-to: "Egger, Christoph" <chegger@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxx>, Keir Fraser <keir@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, "Boris Ostrovsky" <boris.ostrovsky@xxxxxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>, Aravind Gopalakrishnan <Aravind.Gopalakrishnan@xxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>
On 12/07/15 10:03, Egger, Christoph wrote:
> Did you consider nested virtualization?
> L1 hypervisor may have a different tsc scaling
> and L2 guest again may have a different tsc scale ratio.
>
Oh, I forgot this. I'll check the nested TSC scaling code (mostly
about nested SVM TSC ratio, because this patch series does not expose
VMX TSC scaling to L1 guest).
BTW, are there any practical usage scenarios of nested TSC scaling? If
any, I may also need to consider adding nested virtualization support
to VMX TSC scaling.
Haozhong
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