linux-kernel - Re: [PATCH v5 14/14] iommu/arm-smmu-v3: Report events that belong to devices attached to vIOMMU

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250113191817.GA540878@nvidia.com>
Date: Mon, 13 Jan 2025 15:18:17 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: will@...nel.org, kevin.tian@...el.com, corbet@....net,
	oe-kbuild-all@...ts.linux.dev, joro@...tes.org,
	suravee.suthikulpanit@....com, robin.murphy@....com,
	dwmw2@...radead.org, baolu.lu@...ux.intel.com, shuah@...nel.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kselftest@...r.kernel.org, linux-doc@...r.kernel.org,
	eric.auger@...hat.com, jean-philippe@...aro.org, mdf@...nel.org,
	mshavit@...gle.com, shameerali.kolothum.thodi@...wei.com,
	smostafa@...gle.com, ddutile@...hat.com, yi.l.liu@...el.com,
	patches@...ts.linux.dev
Subject: Re: [PATCH v5 14/14] iommu/arm-smmu-v3: Report events that belong to
 devices attached to vIOMMU

On Mon, Jan 13, 2025 at 11:15:21AM -0800, Nicolin Chen wrote:
> On Mon, Jan 13, 2025 at 03:06:41PM -0400, Jason Gunthorpe wrote:
> > On Mon, Jan 13, 2025 at 11:01:10AM -0800, Nicolin Chen wrote:
> > 
> > > +/* This is basically iommu_vevent_arm_smmuv3 in u64 for conversion */
> > > +struct arm_vsmmu_evt {
> > > +	union {
> > > +		u64 evt[EVTQ_ENT_DWORDS];
> > > +		struct iommu_vevent_arm_smmuv3 uevt;
> > > +	};
> > > +};
> > 
> > This doesn't seem right, don't make unions like this
> 
> This is copied from the invalidate union though... Any reason why
> this is no longer good for evt v.s. cmd?

In that case it was trying to be really optimal and copy in place,
here we don't care so much..

Jason