linux-kernel - RE: [PATCH RFCv1 04/14] iommufd: Add struct iommufd_viommu and iommufd_viommu

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Message-ID: <BN9PR11MB527638ED8057DB67C0A0F0BD8CF52@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Fri, 24 May 2024 02:36:29 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: Nicolin Chen <nicolinc@...dia.com>, "will@...nel.org" <will@...nel.org>,
	"robin.murphy@....com" <robin.murphy@....com>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"joro@...tes.org" <joro@...tes.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-tegra@...r.kernel.org"
	<linux-tegra@...r.kernel.org>, "Liu, Yi L" <yi.l.liu@...el.com>,
	"eric.auger@...hat.com" <eric.auger@...hat.com>, "vasant.hegde@....com"
	<vasant.hegde@....com>, "jon.grimm@....com" <jon.grimm@....com>,
	"santosh.shukla@....com" <santosh.shukla@....com>, "Dhaval.Giani@....com"
	<Dhaval.Giani@....com>, "shameerali.kolothum.thodi@...wei.com"
	<shameerali.kolothum.thodi@...wei.com>
Subject: RE: [PATCH RFCv1 04/14] iommufd: Add struct iommufd_viommu and
 iommufd_viommu_ops

> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Thursday, May 23, 2024 8:59 PM
> 
> > > now. If someone needs them linked someday we can add a viommu_id to
> > > the create pri queue command.
> >
> > I'm more worried about the potential conflict between the vqueue
> > object here and the fault queue object in Baolu's series, if we want
> > to introduce vIOMMU concept to platforms which lack of the hw
> > support.
> 
> I assume the vPPRLog will steal all the PRI before it reaches the
> kernel, so once this is turned on Lu's path won't see anything.
> 
> I don't know if AMD can turn vPPRLog on individually or if it is a
> whole package once they switch on VIOMMU..
> 

their spec says:
"
This feature is supported if MMIO Offset 0030h[vIommuSup]=1. When
enabled, DTE[vImuEn]=1 indicates the guest owning this device is a
vIOMMU enabled guest, and IOMMU should write event and peripheral
page requests associated with this device into the guest data structures.
"

so it's configured per device.