linux-kernel - RE: [PATCH CFT 0/4] VT-d PI fixes

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Date:   Tue, 11 Jul 2017 09:16:25 +0000
From:   "Gonglei (Arei)" <arei.gonglei@...wei.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        longpeng <longpeng2@...wei.com>,
        "Huangweidong (C)" <weidong.huang@...wei.com>,
        "wangxin (U)" <wangxinxin.wang@...wei.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: RE: [PATCH CFT 0/4] VT-d PI fixes



> -----Original Message-----
> From: kvm-owner@...r.kernel.org [mailto:kvm-owner@...r.kernel.org] On
> Behalf Of Paolo Bonzini
> Sent: Tuesday, July 11, 2017 4:56 PM
> To: Gonglei (Arei)
> Cc: linux-kernel@...r.kernel.org; kvm@...r.kernel.org; longpeng;
> Huangweidong (C); wangxin (U); Radim Krčmář
> Subject: Re: [PATCH CFT 0/4] VT-d PI fixes
> 
> On 07/06/2017 11:33, Gonglei (Arei) wrote:
> > We are testing your patch, but maybe need some time to report
> > the results because it's not an inevitable problem.
> >
> > Meanwhile we also try to find a possible scenario of non-hotplugging to
> > explain the double-add warnings.
> 
> Hi Lei,
> 
> do you have any updates?  

Dear Paolo,

Thanks for kicking me :) 

TBH, thinking about the reliability of productive project (we use kvm-4.4),
we applied the patch you used in fedora pastebin, and
the bug seems gone after one month's testing.

diff --git a/source/x86/vmx.c b/source/x86/vmx.c
index 79012cf..efc611f 100644
--- a/source/x86/vmx.c
+++ b/source/x86/vmx.c
@@ -11036,8 +11036,9 @@ static void pi_post_block(struct kvm_vcpu *vcpu)
        unsigned int dest;
        unsigned long flags;
 
-       if (!kvm_arch_has_assigned_device(vcpu->kvm) ||
-               !irq_remapping_cap(IRQ_POSTING_CAP))
+       if ((vcpu->pre_pcpu == -1) &&
+               (!kvm_arch_has_assigned_device(vcpu->kvm) ||
+               !irq_remapping_cap(IRQ_POSTING_CAP)))
                return;

> I would like to get at least the first three
> patches in 4.13.
>
I think they are okay to me for upstream.

Thanks,
-Gonglei