linux-kernel - Re: [PATCH v3 5/6] arm64/xen: introduce CONFIG

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Date:	Wed, 05 Jun 2013 10:43:41 -0400
From:	Christopher Covington <cov@...eaurora.org>
To:	Will Deacon <will.deacon@....com>
CC:	Arnd Bergmann <arnd@...db.de>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"Ian.Campbell@...rix.com" <Ian.Campbell@...rix.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 5/6] arm64/xen: introduce CONFIG_XEN and hypercall.S
 on ARM64

Hi Will,

On 06/05/2013 08:50 AM, Will Deacon wrote:
> On Wed, Jun 05, 2013 at 01:44:55PM +0100, Arnd Bergmann wrote:
>> On Wednesday 05 June 2013 13:15:29 Stefano Stabellini wrote:
>>> diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
>>> index c95c5cb..79dd13d 100644
>>> --- a/arch/arm64/Makefile
>>> +++ b/arch/arm64/Makefile
>>> @@ -37,6 +37,7 @@ TEXT_OFFSET := 0x00080000
>>>  export TEXT_OFFSET GZFLAGS
>>>  
>>>  core-y         += arch/arm64/kernel/ arch/arm64/mm/
>>> +core-$(CONFIG_XEN)             += arch/arm64/xen/
>>>  libs-y         := arch/arm64/lib/ $(libs-y)
>>>  libs-y         += $(LIBGCC)
>>>  
>>> diff --git a/arch/arm64/xen/Makefile b/arch/arm64/xen/Makefile
>>> new file mode 100644
>>> index 0000000..be24040
>>> --- /dev/null
>>> +++ b/arch/arm64/xen/Makefile
>>> @@ -0,0 +1,2 @@
>>> +xen-arm-y      += $(addprefix ../../arm/xen/, enlighten.o grant-table.o)
>>> +obj-y          := xen-arm.o hypercall.o
>>
>> I think it would be nicer to redirect the entire directory, not just
>> the enlighten.o and grant-table.o files. You could do in arch/arm64/Makefile:
>>
>> core-(CONFIG_XEN) += arch/arm/xen/
>>
>> That leaves a small difference in hypercall.o, which I think you can
>> handle with an #ifdef.
>>
>> I believe the reason why KVM does the more elaborate variant is that
>> they want to be able to build their code as a loadable module that
>> also includes code from virt/kvm, which you don't need.
> 
> I thought we scrapped the idea of KVM as a loadable module on ARM, mainly
> due to the complexities with retrospective initialisation of HYP mode/EL2?

What if Hyp/EL2 support were dubbed regular kernel code and the rest of KVM
was made loadable?

Christopher

-- 
Employee of Qualcomm Innovation Center, Inc.
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