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

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Date:   Mon, 8 Apr 2019 11:36:31 +0800
From:   "Zhao, Yakui" <yakui.zhao@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
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



On 2019年04月06日 03:01, Thomas Gleixner wrote:
> 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.
> 

Sure.
It will be updated.

>> 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 for your nice and careful review.
Yes. The CONFIG_PARAVIRT is not required.
It will be removed.

> 
> Thanks,
> 
> 	tglx
>