linux-kernel - Re: [RFC PATCH v2 1/3] arch/x86: add the support of ACRN guest

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Date:   Fri, 5 Apr 2019 21:01:06 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Zhao Yakui <yakui.zhao@...el.com>
cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Jason Chen CJ <jason.cj.chen@...el.com>
Subject: Re: [RFC PATCH v2 1/3] arch/x86: add the support of ACRN guest

Zhao,

On Tue, 26 Mar 2019, Zhao Yakui wrote:

Vs. the Subject line: arch/x86: add the support of ACRN guest

The proper prefix for x86 is surprisingly 'x86:' not 'arch/x86:'. Also
please start the first word after the colon with an upper case letter.

> ACRN is one open-source hypervisour, which is maintained by Linux

s/one/an/

> foundation.

by the Linuxfoundation.

> This is to add the para-virtualization support so that
> it allows the Linux guest to run on acrn-hypervisor.
> 
> This adds x86_hyper_acrn into supported hypervisors array, which enables
> Linux ACRN guest running on ACRN hypervisor. It is restricted to X86_64.

Please do not use 'This is to add' or 'This adds'. Just say:

Add ....
 
> v1->v2: Change the CONFIG_ACRN to CONFIG_ACRN_GUEST, which makes it easy to
> understand.
>         Remove the export of x86_hyper_acrn.

Thanks for having the version changes documented, but please put them after
the '---' line below and add another '---' before the diffstat. These
changes are not part of the final change log and if they are below then I
don't have to strip them manually.

> Co-developed-by: Jason Chen CJ <jason.cj.chen@...el.com>
> Signed-off-by: Jason Chen CJ <jason.cj.chen@...el.com>
> Signed-off-by: Zhao Yakui <yakui.zhao@...el.com>
> ---
>  arch/x86/Kconfig                  |  8 ++++++++
>  arch/x86/include/asm/hypervisor.h |  1 +
>  arch/x86/kernel/cpu/Makefile      |  1 +
>  arch/x86/kernel/cpu/acrn.c        | 35 +++++++++++++++++++++++++++++++++++
>  arch/x86/kernel/cpu/hypervisor.c  |  4 ++++
>  5 files changed, 49 insertions(+)
>  create mode 100644 arch/x86/kernel/cpu/acrn.c
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index c1f9b3c..d73225e 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -842,6 +842,14 @@ config JAILHOUSE_GUEST
>  	  cell. You can leave this option disabled if you only want to start
>  	  Jailhouse and run Linux afterwards in the root cell.
>  
> +config ACRN_GUEST
> +	bool "ACRN Guest support"
> +	depends on X86_64 && PARAVIRT

Why does this select PARAVIRT? The current patches are not implementing
anything of the paravirt functionality. Which part of paravirtualization
are you going to provide?

Thanks,

	tglx