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Message-ID: <20241025154239.GJ6956@nvidia.com>
Date: Fri, 25 Oct 2024 12:42:39 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: "Tian, Kevin" <kevin.tian@...el.com>
Cc: Nicolin Chen <nicolinc@...dia.com>, "will@...nel.org" <will@...nel.org>,
	"joro@...tes.org" <joro@...tes.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"robin.murphy@....com" <robin.murphy@....com>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
	"shuah@...nel.org" <shuah@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
	"eric.auger@...hat.com" <eric.auger@...hat.com>,
	"jean-philippe@...aro.org" <jean-philippe@...aro.org>,
	"mdf@...nel.org" <mdf@...nel.org>,
	"mshavit@...gle.com" <mshavit@...gle.com>,
	"shameerali.kolothum.thodi@...wei.com" <shameerali.kolothum.thodi@...wei.com>,
	"smostafa@...gle.com" <smostafa@...gle.com>,
	"Liu, Yi L" <yi.l.liu@...el.com>, "aik@....com" <aik@....com>,
	"zhangfei.gao@...aro.org" <zhangfei.gao@...aro.org>,
	"patches@...ts.linux.dev" <patches@...ts.linux.dev>
Subject: Re: [PATCH v4 00/11] iommufd: Add vIOMMU infrastructure (Part-1)

On Fri, Oct 25, 2024 at 08:34:05AM +0000, Tian, Kevin wrote:
> > The vIOMMU object should be seen as a slice of a physical IOMMU instance
> > that is passed to or shared with a VM. That can be some HW/SW resources:
> >  - Security namespace for guest owned ID, e.g. guest-controlled cache tags
> >  - Access to a sharable nesting parent pagetable across physical IOMMUs
> >  - Virtualization of various platforms IDs, e.g. RIDs and others
> >  - Delivery of paravirtualized invalidation
> >  - Direct assigned invalidation queues
> >  - Direct assigned interrupts
> >  - Non-affiliated event reporting
> 
> sorry no idea about 'non-affiliated event'. Can you elaborate?

This would be an even that is not a connected to a device

For instance a CMDQ experienced a problem.

Jason

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