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From: "Lan, Tianyu" <tianyu.lan@intel.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: "yang.zhang.wz@gmail.com" <yang.zhang.wz@gmail.com>,
	xuquan8@huawei.com, Stefano Stabellini <sstabellini@kernel.org>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	"ian.jackson@eu.citrix.com" <ian.jackson@eu.citrix.com>,
	Kevin Tian <kevin.tian@intel.com>,
	"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
	Jun Nakajima <jun.nakajima@intel.com>,
	"anthony.perard@citrix.com" <anthony.perard@citrix.com>,
	Roger Pau Monne <roger.pau@citrix.com>
Subject: Re: Xen virtual IOMMU high level design doc V2
Date: Wed, 26 Oct 2016 22:53:55 +0800	[thread overview]
Message-ID: <b2b7187e-f837-d2e2-191d-3e8a7c2d7bae@intel.com> (raw)
In-Reply-To: <5810954F0200007800119B0B@prv-mh.provo.novell.com>

On 10/26/2016 5:36 PM, Jan Beulich wrote:
>>>> On 18.10.16 at 16:14, <tianyu.lan@intel.com> wrote:
>> 1.1 Enable more than 255 vcpu support
>> HPC cloud service requires VM provides high performance parallel
>> computing and we hope to create a huge VM with >255 vcpu on one machine
>> to meet such requirement.Ping each vcpus on separated pcpus. More than
>> 255 vcpus support requires X2APIC and Linux disables X2APIC mode if
>> there is no interrupt remapping function which is present by vIOMMU.
>> Interrupt remapping function helps to deliver interrupt to #vcpu >255.
>> So we need to add vIOMMU before enabling >255 vcpus.
>
> I continue to dislike this completely neglecting that we can't even
> have >128 vCPU-s at present. Once again - there's other work to
> be done prior to lack of vIOMMU becoming the limiting factor.
>

Yes, we can increase vcpu from 128 to 255 first without vIOMMU support.
We have some draft patches to enable this. Andrew also will rework CPUID
policy and change the rule of allocating vcpu's APIC ID. So we will base
on it to increase vcpu number. VLAPIC also needs to be changed to
support >255 APIC ID. These jobs can be implemented parallel with vIOMMU.

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  reply	other threads:[~2016-10-26 14:53 UTC|newest]

Thread overview: 86+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-26  8:29 Discussion about virtual iommu support for Xen guest Lan Tianyu
2016-05-26  8:42 ` Dong, Eddie
2016-05-27  2:26   ` Lan Tianyu
2016-05-27  8:11     ` Tian, Kevin
2016-05-26 11:35 ` Andrew Cooper
2016-05-27  8:19   ` Lan Tianyu
2016-06-02 15:03     ` Lan, Tianyu
2016-06-02 18:58       ` Andrew Cooper
2016-06-03 11:01         ` Current PVH/HVMlite work and planning (was :Re: Discussion about virtual iommu support for Xen guest) Roger Pau Monne
2016-06-03 11:21           ` Tian, Kevin
2016-06-03 11:52             ` Roger Pau Monne
2016-06-03 12:11               ` Tian, Kevin
2016-06-03 16:56                 ` Stefano Stabellini
2016-06-07  5:48                   ` Tian, Kevin
2016-06-03 11:17         ` Discussion about virtual iommu support for Xen guest Tian, Kevin
2016-06-03 13:09           ` Lan, Tianyu
2016-06-03 14:00             ` Andrew Cooper
2016-06-03 13:51           ` Andrew Cooper
2016-06-03 14:31             ` Jan Beulich
2016-06-03 17:14             ` Stefano Stabellini
2016-06-07  5:14               ` Tian, Kevin
2016-06-07  7:26                 ` Jan Beulich
2016-06-07 10:07                 ` Stefano Stabellini
2016-06-08  8:11                   ` Tian, Kevin
2016-06-26 13:42                     ` Lan, Tianyu
2016-06-29  3:04                       ` Tian, Kevin
2016-07-05 13:37                         ` Lan, Tianyu
2016-07-05 13:57                           ` Jan Beulich
2016-07-05 14:19                             ` Lan, Tianyu
2016-08-17 12:05                             ` Xen virtual IOMMU high level design doc Lan, Tianyu
2016-08-17 12:42                               ` Paul Durrant
2016-08-18  2:57                                 ` Lan, Tianyu
2016-08-25 11:11                               ` Jan Beulich
2016-08-31  8:39                                 ` Lan Tianyu
2016-08-31 12:02                                   ` Jan Beulich
2016-09-01  1:26                                     ` Tian, Kevin
2016-09-01  2:35                                     ` Lan Tianyu
2016-09-15 14:22                               ` Lan, Tianyu
2016-10-05 18:36                                 ` Konrad Rzeszutek Wilk
2016-10-11  1:52                                   ` Lan Tianyu
2016-11-23 18:19                               ` Edgar E. Iglesias
2016-11-23 19:09                                 ` Stefano Stabellini
2016-11-24  2:00                                   ` Tian, Kevin
2016-11-24  4:09                                     ` Edgar E. Iglesias
2016-11-24  6:49                                       ` Lan Tianyu
2016-11-24 13:37                                         ` Edgar E. Iglesias
2016-11-25  2:01                                           ` Xuquan (Quan Xu)
2016-11-25  5:53                                           ` Lan, Tianyu
2016-10-18 14:14                             ` Xen virtual IOMMU high level design doc V2 Lan Tianyu
2016-10-18 19:17                               ` Andrew Cooper
2016-10-20  9:53                                 ` Tian, Kevin
2016-10-20 18:10                                   ` Andrew Cooper
2016-10-20 14:17                                 ` Lan Tianyu
2016-10-20 20:36                                   ` Andrew Cooper
2016-10-22  7:32                                     ` Lan, Tianyu
2016-10-26  9:39                                       ` Jan Beulich
2016-10-26 15:03                                         ` Lan, Tianyu
2016-11-03 15:41                                         ` Lan, Tianyu
2016-10-28 15:36                                     ` Lan Tianyu
2016-10-18 20:26                               ` Konrad Rzeszutek Wilk
2016-10-20 10:11                                 ` Tian, Kevin
2016-10-20 14:56                                 ` Lan, Tianyu
2016-10-26  9:36                               ` Jan Beulich
2016-10-26 14:53                                 ` Lan, Tianyu [this message]
2016-11-17 15:36                             ` Xen virtual IOMMU high level design doc V3 Lan Tianyu
2016-11-18 19:43                               ` Julien Grall
2016-11-21  2:21                                 ` Lan, Tianyu
2016-11-21 13:17                                   ` Julien Grall
2016-11-21 18:24                                     ` Stefano Stabellini
2016-11-21  7:05                               ` Tian, Kevin
2016-11-23  1:36                                 ` Lan Tianyu
2016-11-21 13:41                               ` Andrew Cooper
2016-11-22  6:02                                 ` Tian, Kevin
2016-11-22  8:32                                 ` Lan Tianyu
2016-11-22 10:24                               ` Jan Beulich
2016-11-24  2:34                                 ` Lan Tianyu
2016-06-03 19:51             ` Is: 'basic pci bridge and root device support. 'Was:Re: Discussion about virtual iommu support for Xen guest Konrad Rzeszutek Wilk
2016-06-06  9:55               ` Jan Beulich
2016-06-06 17:25                 ` Konrad Rzeszutek Wilk
2016-08-02 15:15     ` Lan, Tianyu
2016-05-27  8:35   ` Tian, Kevin
2016-05-27  8:46     ` Paul Durrant
2016-05-27  9:39       ` Tian, Kevin
2016-05-31  9:43   ` George Dunlap
2016-05-27  2:26 ` Yang Zhang
2016-05-27  8:13   ` Tian, Kevin

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