linux-kernel - Re: [PATCH v3 RESEND] 2/2] x86, arm, platform, xen, kconfig: add xen defconfig helper

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Message-ID: <alpine.DEB.2.10.1502101645390.5692@chino.kir.corp.google.com>
Date:	Tue, 10 Feb 2015 16:49:13 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>, mingo@...hat.com,
	tglx@...utronix.de, hpa@...or.com, josh@...htriplett.org,
	mmarek@...e.cz, sam@...nborg.org, stefano.stabellini@...citrix.com,
	bpoirier@...e.de, x86@...nel.org, kvm@...r.kernel.org,
	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
	julien.grall@...aro.org, mcgrof@...e.com,
	Borislav Petkov <bp@...e.de>,
	Pekka Enberg <penberg@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>, levinsasha928@...il.com,
	mtosatti@...hat.com, fengguang.wu@...el.com,
	David Vrabel <david.vrabel@...rix.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH v3 RESEND] 2/2] x86, arm, platform, xen, kconfig: add
 xen defconfig helper

On Tue, 10 Feb 2015, Luis R. Rodriguez wrote:

> From: "Luis R. Rodriguez" <mcgrof@...e.com>
> 
> This lets you build a kernel which can support xen dom0
> or xen guests by just using:
> 
>    make xenconfig
> 
> on both x86 and arm64 kernels. This also splits out the
> options which are available currently to be built with x86
> and 'make ARCH=arm64' under a shared config.
> 
> Technically xen supports a dom0 kernel and also a guest
> kernel configuration but upon review with the xen team
> since we don't have many dom0 options its best to just
> combine these two into one.
> 

This doesn't work because neither CONFIG_HYPERVISOR_GUEST in 
arch/x86/configs/xen.config nor CONFIG_PARAVIRT in 
kernel/configs/xen.config get enabled.

make kvmconfig does this appropriately.

You can test this with make {allno,def}config; make xenconfig.  Notice 
there's no difference with your patchset.
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