Re: [Xen-devel] [BUG] win2008 guest cannot get ip through sriov

["Xu, Quan" <quan.xu@xxxxxxxxx>]

On June 02, 2016 8:09 PM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
> >>> On 02.06.16 at 13:03, <wei.liu2@xxxxxxxxxx> wrote:
> > On Thu, Jun 02, 2016 at 04:38:47AM -0600, Jan Beulich wrote:
> >> >>> On 02.06.16 at 12:22, <wei.liu2@xxxxxxxxxx> wrote:
> >> > On Thu, Jun 02, 2016 at 07:31:06AM +0000, Xu, Quan wrote:
> >> >> On May 27, 2016 10:06 PM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
> >> >> > >>> On 27.05.16 at 15:34, <wei.liu2@xxxxxxxxxx> wrote:
> >> >> > > On Fri, May 27, 2016 at 06:16:30AM -0600, Jan Beulich wrote:
> >> >> > >> >>> On 27.05.16 at 12:39, <wei.liu2@xxxxxxxxxx> wrote:
> >> >> > >> > Is this a regression? Does it work on previous versions of Xen?
> >> >> > >>
> >> >> > >> I think this is what was already reported by other Intel
> >> >> > >> people, see e.g. Quan's most recent reply:
> >> >> > >> http://lists.xenproject.org/archives/html/xen-devel/2016-
> 05/msg01896.
> >> >> > >> html It is not clear where the problem is, and not seeing the
> >> >> > >> issue myself makes it hard to analyze. In any event this
> >> >> > >> quite likely is a regression.
> >> >> > >>
> >> >> > >
> >> >> > > My reading of that email thread and all relevant links
> >> >> > > (including the KVM bug report) is that there is a regression vf 
> >> >> > > driver,
> but not in Xen.
> >> >> >
> >> >> > Just from reading that I would tend to agree. But the report
> >> >> > here is about Win2K8.
> >> >>
> >> >> Do you know which commit is a regression one? I try to find out
> >> >> the
> >> > regression commit.  That may be helpful to find out the root cause.
> >> >>
> >> >> Btw, some feedback from QA team, rhel 6.4 VM  doesn't work, but
> >> >> rhel 7.2 VM
> > does.
> >> >
> >> > Isn't this at least an indication that the guest could be buggy here?
> >> > It could also be both the hypervsior and guest have bugs. But we're
> >> > just not sure at this point.
> >>
> >> Indeed, and (with the many fixes that went in already) I really
> >> suspect a combination of both, or some of the involved hypervisor
> >> changes having unmasked some guest issue. Regardless, I'm afraid this
> >> ought to be treated as a blocker for the release at least until we
> >> understand what the issue is. But otoh making it a blocker probably
> >> makes sense only if we can expect progress (which we haven't really
> >> made for quite long a time).
> >>
> >
> > This issue is on my list, but the information gathered so far isn't
> > convincing enough to make it a blocker.
> >
> > And yes, we need meaningful progress to make it a blocker. To make it
> > so, commitment from various parties is needed. Let's start with
> > setting out things to look at, who is going to investigate what, and a
> > possible timeline for each item.
> >
> > Jan, can you come up with a list of what sort of information you need?
> 
> Well, I had hoped to avoid that. But now that you ask for it, providing an 
> initial
> debugging patch seems better than a description which may get
> misunderstood. Attached both a hypervisor and a qemu patch. Their plus
> debug key M and i output is what I'd like to start with.
> 


     I will try these 2 patches.

btw. I read the internal Bugzilla carefully. I found that vf is working for 
win2k8  at  '2014-12-01 14:32:09 EST', but the bug still exist on ' 2015-02-11 
15:54:05 EST '.
then, I grepped the commit logs, the below 4 MSI-X related commits are may the 
root cause.


From 6fb3a07bc0ad656b5f76eb9fc961bcd1d3cace58 Mon Sep 17 00:00:00 2001
From: Jan Beulich <JBeulich@xxxxxxxx>
Date: Fri, 12 Dec 2014 10:24:13 +0000
Subject: [PATCH 13/44] domctl: fix IRQ permission granting/revocation


From 1965728cd5a1635859158f5800d844fc16774668 Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Mon, 12 Jan 2015 11:29:33 -0500
Subject: [PATCH 42/44] Revert "dpci: add 'masked' as a gate for
 hvm_dirq_assist to process"


From 72f3c1e26e96686a41d2de1663e578538659f99a Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Mon, 12 Jan 2015 11:30:00 -0500
Subject: [PATCH 43/44] Revert "dpci: replace tasklet with softirq"

rom a8ac2290ed95dbbc0dc1bdde86fc3a49fe784b28 Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Mon, 12 Jan 2015 11:30:05 -0500
Subject: [PATCH 44/44] Revert "dpci: move from an hvm_irq_dpci (and struct
 domain) to an hvm_dirq_dpci model"

Quan


> Jan
> 
> > And then maybe Quan and Pengtao can give an estimation on how long it
> > takes to gather all necessary information and move on to next stage.
> >
> > Wei.
> >
> >> Jan
> >>
> 
> 


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