From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 50891] New: The smp_affinity cannot work correctly when PCI
 passthrough device using msi/msi-x with KVM
Date: Thu, 22 Nov 2012 15:37:09 +0000 (UTC)
Message-ID: <bug-50891-28872@https.bugzilla.kernel.org/>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: QUOTED-PRINTABLE
To: kvm@vger.kernel.org
Return-path: <kvm-owner@vger.kernel.org>
Received: from mail.kernel.org ([198.145.19.201]:49516 "EHLO mail.kernel.org"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1754803Ab2KVSkD convert rfc822-to-8bit (ORCPT
	<rfc822;kvm@vger.kernel.org>); Thu, 22 Nov 2012 13:40:03 -0500
Received: from mail.kernel.org (localhost [127.0.0.1])
	by mail.kernel.org (Postfix) with ESMTP id CEA90204CE
	for <kvm@vger.kernel.org>; Thu, 22 Nov 2012 15:37:10 +0000 (UTC)
Received: from bugzilla.kernel.org (bugzilla.kernel.org [198.145.19.217])
	by mail.kernel.org (Postfix) with ESMTP id D5FB5204C7
	for <kvm@vger.kernel.org>; Thu, 22 Nov 2012 15:37:09 +0000 (UTC)
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

https://bugzilla.kernel.org/show_bug.cgi?id=3D50891

           Summary: The smp_affinity cannot work correctly when PCI
                    passthrough device using msi/msi-x with KVM
           Product: Virtualization
           Version: unspecified
    Kernel Version: 3.7-rc6
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
        AssignedTo: virtualization_kvm@kernel-bugs.osdl.org
        ReportedBy: yilikernel@gmail.com
                CC: kvm@vger.kernel.org
        Regression: No


1: passthrough a netcard (Brodcom BCM5716S) to the guest os

2: ifup the netcard, the card will use msi-x interrupt default, and clo=
se the
irqbalance service

3:  echo 4 > cat /proc/irq/NETCARDIRQ/smp_affinity, so we assume the vc=
pu2
handle the irq.

4: we have set <vcpupin vcpu=3D'2' cpuset=3D'1'/> and set the irq kvm:p=
ci-bus to
the pcpu1 on the host.

we think this configure will reduce the ipi interrupt when inject inter=
rupt to
the guest os. but this irq is not only handle on vcpu2. it is not expec=
t=E3=80=82

--=20
Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=3Demai=
l
------- You are receiving this mail because: -------
You are on the CC list for the bug.
You are watching the assignee of the bug.