linux-kernel - Re: [PATCH v2 02/19] iommufd/viommu: Add IOMMUFD_OBJ_VIOMMU and IOMMU_VIOMMU

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Message-ID: <ZtnmDvhVVKeE4Z/u@nvidia.com>
Date: Thu, 5 Sep 2024 10:10:38 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: <kevin.tian@...el.com>, <will@...nel.org>, <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>,
	<eric.auger@...hat.com>, <jean-philippe@...aro.org>, <mdf@...nel.org>,
	<mshavit@...gle.com>, <shameerali.kolothum.thodi@...wei.com>,
	<smostafa@...gle.com>, <yi.l.liu@...el.com>
Subject: Re: [PATCH v2 02/19] iommufd/viommu: Add IOMMUFD_OBJ_VIOMMU and
 IOMMU_VIOMMU_ALLOC ioctl

On Thu, Sep 05, 2024 at 12:53:02PM -0300, Jason Gunthorpe wrote:
> On Tue, Aug 27, 2024 at 09:59:39AM -0700, Nicolin Chen wrote:
> > +/**
> > + * struct iommu_viommu_alloc - ioctl(IOMMU_VIOMMU_ALLOC)
> > + * @size: sizeof(struct iommu_viommu_alloc)
> > + * @flags: Must be 0
> > + * @type: Type of the virtual IOMMU. Must be defined in enum iommu_viommu_type
> > + * @dev_id: The device to allocate this virtual IOMMU for
> 
> @dev_id: The device's physical IOMMU will be used to back t he vIOMMU
> 
> > + * @hwpt_id: ID of a nesting parent HWPT to associate to
> 
> A nesting parent HWPT that will provide translation for an vIOMMU DMA
>
> > + * @out_viommu_id: Output virtual IOMMU ID for the allocated object
> > + *
> > + * Allocate a virtual IOMMU object that holds a (shared) nesting parent HWPT
> 
> Allocate a virtual IOMMU object that represents the underlying
> physical IOMMU's virtualization support. The vIOMMU object is a
> security isolated slice of the physical IOMMU HW that is unique to a
> specific VM. Operations global to the IOMMU are connected to the
> vIOMMU, such as:
>   - Security namespace for guest owned ID, eg guest controlled cache tags
>   - Virtualization of various platforms IDs like RIDs and others
>   - direct assigned invalidation queues
>   - direct assigned interrupts
>   - non-affiliated event reporting
>   - Delivery of paravirtualized invalidation

Ack.

Looks like you prefer using "vIOMMU" v.s. "VIOMMU"? I would go
through all the patches (QEMU including) to keep that aligned.

Thanks
Nicolin