linux-kernel - Re: [PATCH v3 26/30] drivers: hv: dxgkrnl: Offer and reclaim allocations

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Message-ID: <fe018236-35b5-3bc1-6984-fca9537e47c7@linux.microsoft.com>
Date:   Wed, 2 Mar 2022 10:13:34 -0800
From:   Iouri Tarassov <iourit@...ux.microsoft.com>
To:     Wei Liu <wei.liu@...nel.org>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        spronovo@...rosoft.com, spronovo@...ux.microsoft.com,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH v3 26/30] drivers: hv: dxgkrnl: Offer and reclaim
 allocations

On 3/2/2022 6:25 AM, Wei Liu wrote:
> On Tue, Mar 01, 2022 at 11:46:13AM -0800, Iouri Tarassov wrote:
> > Implement ioctls to offer and reclaim compute device allocations:
> >   - LX_DXOFFERALLOCATIONS,
> >   - LX_DXRECLAIMALLOCATIONS2
> > 
> > When a user mode driver (UMD) does not need to access an allocation,
>
> What is a "user mode driver" in this context? Is that something that
> runs inside the guest?

Hi Wei,

The user mode driver runs inside the guest. This driver is written by
hardware vendors.
For example, the NVIDIA's Cuda runtime is considered a user mode driver.
The driver
provides a specific API to applications (like the Cuda API).

The cover letter explains the design of the virtual compute device
paravirtualization
model and describes all components, which are involved. I feel that I do
not need to
include explanation to every patch.

Thanks
Iouri