linux-kernel - Re: [PATCH v1 08/16] iommufd/viommu: Introduce IOMMUFD_OBJ

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Message-ID: <aAZmcpXygg51Gwt1@Asurada-Nvidia>
Date: Mon, 21 Apr 2025 08:38:26 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: "Tian, Kevin" <kevin.tian@...el.com>
CC: "jgg@...dia.com" <jgg@...dia.com>, "corbet@....net" <corbet@....net>,
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Subject: Re: [PATCH v1 08/16] iommufd/viommu: Introduce IOMMUFD_OBJ_VCMDQ and
 its related struct

On Mon, Apr 21, 2025 at 08:03:01AM +0000, Tian, Kevin wrote:
> > From: Nicolin Chen <nicolinc@...dia.com>
> > Sent: Friday, April 11, 2025 2:38 PM
> > 
> > Add a new IOMMUFD_OBJ_VCMDQ with an iommufd_vcmdq structure,
> > representing
> > a command queue type of physical HW passed to or shared with a user
> > space
> > VM. 
> 
> what is the implication of "or shared with"? Do you intend to support
> an usage in which a CMDQ is coordinated by both guest and host (which
> sounds insane)?

No. It should have been removed. Was for "vQUEUE" previously for
a potential wider use case. Will fix this.

Thanks
Nicolin