From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <JBeulich@suse.com>
Subject: Re: [RFC Design Doc] Add vNVDIMM support for Xen
Date: Wed, 03 Feb 2016 07:39:44 -0700
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To: Andrew Cooper <andrew.cooper3@citrix.com>, Haozhong Zhang <haozhong.zhang@intel.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Juergen Gross <JGross@suse.com>, Kevin Tian <kevin.tian@intel.com>, Wei Liu <wei.liu2@citrix.com>, Ian Campbell <ian.campbell@citrix.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, George Dunlap <George.Dunlap@eu.citrix.com>, Ian Jackson <ian.jackson@eu.citrix.com>, xen-devel@lists.xen.org, Jun Nakajima <jun.nakajima@intel.com>, Xiao Guangrong <guangrong.xiao@linux.intel.com>, Keir Fraser <keir@xen.org>
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>>> On 03.02.16 at 15:30, <andrew.cooper3@citrix.com> wrote:
> On 03/02/16 09:18, Jan Beulich wrote:
>>>
>>>> In other words - the NVDIMM resource does not provide any resource
>>>> isolation. However this may not be any different than what we had
>>>> nowadays with CPU caches.
>>>>
>>> Does Xen have any mechanism to isolate multiple guests' operations on
>>> CPU caches?
>> No.
> 
> PSR Cache Allocation is supported in Xen 4.6 on supporting hardware, so
> the administrator can partition guests if necessary.

And if the hardware supports it (which for a while might be more the
exception than the rule).

Jan