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Message-ID: <ZNOdEtbMaHg9Vmmq@ziepe.ca>
Date: Wed, 9 Aug 2023 11:05:06 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: "Tian, Kevin" <kevin.tian@...el.com>
Cc: Baolu Lu <baolu.lu@...ux.intel.com>,
Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
Robin Murphy <robin.murphy@....com>,
Jean-Philippe Brucker <jean-philippe@...aro.org>,
Nicolin Chen <nicolinc@...dia.com>,
"Liu, Yi L" <yi.l.liu@...el.com>,
Jacob Pan <jacob.jun.pan@...ux.intel.com>,
"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 03/12] iommu: Remove unrecoverable fault data
On Wed, Aug 09, 2023 at 12:01:52AM +0000, Tian, Kevin wrote:
> > From: Jason Gunthorpe <jgg@...pe.ca>
> > Sent: Wednesday, August 9, 2023 2:40 AM
> >
> > On Fri, Aug 04, 2023 at 03:51:30AM +0000, Tian, Kevin wrote:
> > > > From: Baolu Lu <baolu.lu@...ux.intel.com>
> > > > Sent: Friday, August 4, 2023 10:59 AM
> > > >
> > > > On 2023/8/3 15:54, Tian, Kevin wrote:
> > > > >> From: Lu Baolu<baolu.lu@...ux.intel.com>
> > > > >> Sent: Thursday, July 27, 2023 1:48 PM
> > > > >>
> > > > >> struct iommu_fault {
> > > > >> __u32 type;
> > > > >> - __u32 padding;
> > > > > this padding should be kept.
> > > > >
> > > >
> > > > To keep above 64-bit aligned, right?
> > > >
> > >
> > > yes
> >
> > If it is not uapi we should not explicitly document padding (and __u32
> > should be u32). The compiler will add it if it is necessary.
> >
> > If the compiler isn't right for some reason then something else has
> > gone wrong.
> >
>
> I thought this will be used as uAPI later. I'm fine to leave it be and
> add the padding when the uAPI is introduced.
Yes
Jason
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