[vfio-users] How to choose a compatible motherboard?

[Dan Ziemba]

Aren't the Haswell-E chips using the same socket as the Xeon E5?  Could
it just be that anything in that socket supports ACS?

-----Original Message-----
From: Alex Williamson <alex.l.williamson at gmail.com>
To: Nick Sukharev <nicksukharev at gmail.com>
Cc: vfio-users <vfio-users at redhat.com>
Subject: Re: [vfio-users] How to choose a compatible motherboard?
Date: Thu, 22 Oct 2015 18:11:59 -0600

On Thu, Oct 22, 2015 at 5:29 PM, Nick Sukharev <nicksukharev at gmail.com> wrote:
> Here you go:
> http://pastebin.com/He3EUWkn
> 
00:01.0 PCI bridge: Intel Corporation Xeon E5 v3/Core i7 PCI Express Root Port 1 (rev 02) (prog-if 00 [Normal decode])
        ....
        Capabilities: [110 v1] Access Control Services
                ACSCap: SrcValid+ TransBlk+ ReqRedir+ CmpltRedir+ UpstreamFwd+ EgressCtrl- DirectTrans-
                ACSCtl: SrcValid+ TransBlk- ReqRedir+ CmpltRedir+ UpstreamFwd+ EgressCtrl- DirectTrans-
 
00:01.1 PCI bridge: Intel Corporation Xeon E5 v3/Core i7 PCI Express Root Port 1 (rev 02) (prog-if 00 [Normal decode])
        ....
        Capabilities: [110 v1] Access Control Services
                ACSCap: SrcValid+ TransBlk+ ReqRedir+ CmpltRedir+ UpstreamFwd+ EgressCtrl- DirectTrans-
                ACSCtl: SrcValid+ TransBlk- ReqRedir+ CmpltRedir+ UpstreamFwd+ EgressCtrl- DirectTrans-
 
00:03.0 PCI bridge: Intel Corporation Xeon E5 v3/Core i7 PCI Express Root Port 3 (rev 02) (prog-if 00 [Normal decode])
        ....
        Capabilities: [110 v1] Access Control Services
                ACSCap: SrcValid+ TransBlk+ ReqRedir+ CmpltRedir+ UpstreamFwd+ EgressCtrl- DirectTrans-
                ACSCtl: SrcValid+ TransBlk- ReqRedir+ CmpltRedir+ UpstreamFwd+ EgressCtrl- DirectTrans-

Well, your processor root ports do support ACS, so you're right, a Xeon wouldn't offer you an advantage in this space.  This goes against what I've heard from Intel.  I don't know how to predict which Core processors will include this feature.  Can others double check their processors for ACS and report if they find it?  Anyone else with a Haswell-E as reported by ark or a "High End Desktop Processor" as reported by ark that does or does not expose ACS like above?
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