linux-kernel - Re: [PATCH v8 05/29] iommu: Add a timeout parameter for PRQ response

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Date:   Tue, 4 Jun 2019 08:50:24 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Jean-Philippe Brucker <jean-philippe.brucker@....com>
Cc:     Alex Williamson <alex.williamson@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        "eric.auger.pro@...il.com" <eric.auger.pro@...il.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
        "joro@...tes.org" <joro@...tes.org>,
        "yi.l.liu@...el.com" <yi.l.liu@...el.com>,
        Will Deacon <Will.Deacon@....com>,
        Robin Murphy <Robin.Murphy@....com>,
        "kevin.tian@...el.com" <kevin.tian@...el.com>,
        "ashok.raj@...el.com" <ashok.raj@...el.com>,
        Marc Zyngier <Marc.Zyngier@....com>,
        "peter.maydell@...aro.org" <peter.maydell@...aro.org>,
        Vincent Stehle <Vincent.Stehle@....com>,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v8 05/29] iommu: Add a timeout parameter for PRQ
 response

On Tue, 4 Jun 2019 11:52:18 +0100
Jean-Philippe Brucker <jean-philippe.brucker@....com> wrote:

> On 03/06/2019 23:32, Alex Williamson wrote:
> > It doesn't seem to make much sense to include this patch without
> > also including "iommu: handle page response timeout".  Was that one
> > lost? Dropped?  Lives elsewhere?  
> 
> The first 7 patches come from my sva/api branch, where I had forgotten
> to add the "handle page response timeout" patch. I added it back,
> probably after Eric sent this version. But I don't think the patch is
> ready for upstream, as we still haven't decided how to proceed with
> timeouts. Patches 6 and 7 are for debugging, I don't know if they
> should go upstream.
Yeah, we can wait until we all agree on timeouts. It was introduced for
a basic safeguard against unresponsive guests.