linux-kernel - Re: [PATCH v2 1/3] virt: acrn: Introduce interfaces for MMIO device passthrough

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Date:   Wed, 25 Aug 2021 22:43:29 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Fei Li <fei1.li@...el.com>
Cc:     linux-kernel@...r.kernel.org, yu1.wang@...el.com,
        shuox.liu@...il.com
Subject: Re: [PATCH v2 1/3] virt: acrn: Introduce interfaces for MMIO device
 passthrough

On Wed, Aug 25, 2021 at 05:01:40PM +0800, Fei Li wrote:
> From: Shuo Liu <shuo.a.liu@...el.com>
> 
> MMIO device passthrough enables an OS in a virtual machine to directly
> access a MMIO device in the host. It promises almost the native
> performance, which is required in performance-critical scenarios of
> ACRN.
> 
> HSM provides the following ioctls:
>   - Assign - ACRN_IOCTL_ASSIGN_MMIODEV
>     Pass data struct acrn_mmiodev from userspace to the hypervisor, and
>     inform the hypervisor to assign a MMIO device to a User VM.
> 
>   - De-assign - ACRN_IOCTL_DEASSIGN_PCIDEV
>     Pass data struct acrn_mmiodev from userspace to the hypervisor, and
>     inform the hypervisor to de-assign a MMIO device from a User VM.
> 
> Signed-off-by: Shuo Liu <shuo.a.liu@...el.com>
> Signed-off-by: Fei Li <fei1.li@...el.com>

Where is the userspace code that uses this new api?

thanks,

greg k-h