linux-kernel - Re: [PATCH v4 01/17] docs: acrn: Introduce ACRN

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Message-ID: <08a5b43f-e75a-12ca-642b-133fef3606ba@infradead.org>
Date:   Thu, 8 Oct 2020 18:48:52 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     shuo.a.liu@...el.com, linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Yu Wang <yu1.wang@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Fengwei Yin <fengwei.yin@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>
Subject: Re: [PATCH v4 01/17] docs: acrn: Introduce ACRN

On 9/22/20 4:42 AM, shuo.a.liu@...el.com wrote:
> From: Shuo Liu <shuo.a.liu@...el.com>
> 
> Add documentation on the following aspects of ACRN:
> 
>   1) A brief introduction on the architecture of ACRN.
>   2) I/O request handling in ACRN.
> 
> To learn more about ACRN, please go to ACRN project website
> https://projectacrn.org, or the documentation page
> https://projectacrn.github.io/.
> 
> Signed-off-by: Shuo Liu <shuo.a.liu@...el.com>
> Reviewed-by: Zhi Wang <zhi.a.wang@...el.com>
> Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
> Cc: Dave Hansen <dave.hansen@...el.com>
> Cc: Sen Christopherson <sean.j.christopherson@...el.com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Fengwei Yin <fengwei.yin@...el.com>
> Cc: Zhi Wang <zhi.a.wang@...el.com>
> Cc: Zhenyu Wang <zhenyuw@...ux.intel.com>
> Cc: Yu Wang <yu1.wang@...el.com>
> Cc: Reinette Chatre <reinette.chatre@...el.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  Documentation/virt/acrn/index.rst        | 11 +++
>  Documentation/virt/acrn/introduction.rst | 40 ++++++++++
>  Documentation/virt/acrn/io-request.rst   | 97 ++++++++++++++++++++++++
>  Documentation/virt/index.rst             |  1 +
>  MAINTAINERS                              |  7 ++
>  5 files changed, 156 insertions(+)
>  create mode 100644 Documentation/virt/acrn/index.rst
>  create mode 100644 Documentation/virt/acrn/introduction.rst
>  create mode 100644 Documentation/virt/acrn/io-request.rst
> 

> diff --git a/Documentation/virt/acrn/io-request.rst b/Documentation/virt/acrn/io-request.rst
> new file mode 100644
> index 000000000000..019dc5978f7c
> --- /dev/null
> +++ b/Documentation/virt/acrn/io-request.rst
> @@ -0,0 +1,97 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +I/O request handling
> +====================
> +
> +An I/O request of a User VM, which is constructed by the hypervisor, is
> +distributed by the ACRN Hypervisor Service Module to an I/O client
> +corresponding to the address range of the I/O request. Details of I/O request
> +handling are described in the following sections.
> +
> +1. I/O request
> +--------------
> +

...

> +
> +2. I/O clients
> +--------------
> +

...

> +
> +3. I/O request state transition
> +-------------------------------
> +
> +The state transitions of a ACRN I/O request are as follows.

                         of an ACRN

> +
> +::
> +
> +   FREE -> PENDING -> PROCESSING -> COMPLETE -> FREE -> ...
> +
> +- FREE: this I/O request slot is empty
> +- PENDING: a valid I/O request is pending in this slot
> +- PROCESSING: the I/O request is being processed
> +- COMPLETE: the I/O request has been processed
> +
> +An I/O request in COMPLETE or FREE state is owned by the hypervisor. HSM and
> +ACRN userspace are in charge of processing the others.
> +
> +4. Processing flow of I/O requests
> +-------------------------------
> +

...



thanks.
-- 
~Randy