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

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Message-ID: <YSDoP0mgMrQLaXxG@kroah.com>
Date:   Sat, 21 Aug 2021 13:49:19 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Fei Li <fei1.li@...el.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        yu1.wang@...el.com, shuox.liu@...il.com
Subject: Re: [PATCH 1/3] virt: acrn: Introduce interfaces for MMIO device
 passthrough

On Fri, Aug 20, 2021 at 02:03:04PM +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>
> ---
>  drivers/virt/acrn/hsm.c       | 25 +++++++++++++++++++++++++
>  drivers/virt/acrn/hypercall.h | 26 ++++++++++++++++++++++++++
>  include/uapi/linux/acrn.h     | 28 ++++++++++++++++++++++++++++
>  3 files changed, 79 insertions(+)
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>