linux-kernel - Re: [Xen-devel] [PATCH v3 2/2] x86, arm64, platform, xen, kconfig: add xen defconfig helper

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Message-ID: <CAB=NE6UCQXzUVU2tpZxiYXEp+77rtsfhFpLFKvb8371iK8FJBA@mail.gmail.com>
Date:	Tue, 9 Dec 2014 15:27:00 -0800
From:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
To:	Julien Grall <julien.grall@...aro.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, josh@...htriplett.org,
	sam@...nborg.org, Michal Marek <mmarek@...e.cz>,
	Randy Dunlap <rdunlap@...radead.org>,
	Ian Campbell <Ian.Campbell@...rix.com>, kvm@...r.kernel.org,
	x86@...nel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	mtosatti@...hat.com, Pekka Enberg <penberg@...nel.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Sasha Levin <levinsasha928@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	xen-devel@...ts.xenproject.org, Borislav Petkov <bp@...e.de>,
	David Vrabel <david.vrabel@...rix.com>,
	Benjamin Poirier <bpoirier@...e.de>
Subject: Re: [Xen-devel] [PATCH v3 2/2] x86, arm64, platform, xen, kconfig:
 add xen defconfig helper

On Tue, Dec 9, 2014 at 12:37 PM, Julien Grall <julien.grall@...aro.org> wrote:
> On 09/12/14 20:22, Luis R. Rodriguez wrote:
>> On Tue, Dec 9, 2014 at 1:06 AM, Julien Grall <julien.grall@...aro.org> wrote:
>>> Hello Luis,
>>>
>>> On 08/12/2014 23:05, Luis R. Rodriguez wrote:
>>>>
>>>> diff --git a/kernel/configs/xen.config b/kernel/configs/xen.config
>>>> new file mode 100644
>>>> index 0000000..0d0eb6d
>>>> --- /dev/null
>>>> +++ b/kernel/configs/xen.config
>>>> +CONFIG_XEN_MCE_LOG=y
>>>
>>>
>>> MCE is x86 specific.
>>
>> That's what I thought too but its available for arm64, so should we
>> fix that Kconfig to depend on x86?
>
> Are you sure? On the Linus's repo I have:
>
> config XEN_MCE_LOG
>         bool "Xen platform mcelog"
>         depends on XEN_DOM0 && X86_64 && X86_MCE
>
> Anyway, the MCE interface in the hypervisor is implemented in arch/x86
> not in common code.

OK I'll move to x86.

>>>> +CONFIG_XEN_HAVE_PVMMU=y
>>>
>>>
>>> We don't have PVMMU support on ARM. Shouldn't you move this config in
>>> architecture specific code?
>>
>> If you are sure then yes.
>
> I'm 100% sure. MMU is handled by the hardware on ARM.
>
> Thinking a bit more about this option. CONFIG_XEN_HAVE_PVMMU can't be
> selected by the user. It's automatically added per platform (for
> instance see arch/x86/xen/Kconfig).
>
> So maybe it should not even appear in the one of the fragment configs?

And I'll remove this one.

 Luis
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