linux-kernel - RE: [PATCH v2 00/19] iommufd: Add VIOMMU infrastructure (Part-1)

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Message-ID: <BL1PR11MB5271EF54689B9666360A0F188C9B2@BL1PR11MB5271.namprd11.prod.outlook.com>
Date: Wed, 11 Sep 2024 06:12:21 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Nicolin Chen <nicolinc@...dia.com>, "jgg@...dia.com" <jgg@...dia.com>,
	"will@...nel.org" <will@...nel.org>
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	<smostafa@...gle.com>, "Liu, Yi L" <yi.l.liu@...el.com>
Subject: RE: [PATCH v2 00/19] iommufd: Add VIOMMU infrastructure (Part-1)

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Wednesday, August 28, 2024 1:00 AM
> 
[...]
> On a multi-IOMMU system, the VIOMMU object can be instanced to the
> number
> of vIOMMUs in a guest VM, while holding the same parent HWPT to share
> the

Is there restriction that multiple vIOMMU objects can be only created
on a multi-IOMMU system?

> stage-2 IO pagetable. Each VIOMMU then just need to only allocate its own
> VMID to attach the shared stage-2 IO pagetable to the physical IOMMU:

this reads like 'VMID' is a virtual ID allocated by vIOMMU. But from the
entire context it actually means the physical 'VMID' allocated on the
associated physical IOMMU, correct?