linux-kernel - Re: [tip:x86/urgent] x86/kconfig: Add a Kconfig shortcut for building working KVM guest kernels

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Date:	Wed, 1 May 2013 22:35:00 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org, Pekka Enberg <penberg@...nel.org>,
	levinsasha928@...il.com, mtosatti@...hat.com, tglx@...utronix.de,
	Borislav Petkov <bp@...e.de>, fengguang.wu@...el.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86/kconfig:  Add a Kconfig shortcut for
 building working KVM guest kernels

On Wed, May 01, 2013 at 12:53:03PM -0700, David Rientjes wrote:
> since KVM_GUEST_COMMON_OPTIONS selects PCI_MSI without selecting PCI.
> 
> If we select PCI in KVM_GUEST_COMMON_OPTIONS, we get:
> 
> arch/x86/Kconfig:651:error: recursive dependency detected!
> arch/x86/Kconfig:651:	symbol KVM_GUEST_COMMON_OPTIONS depends on HYPERVISOR_GUEST
> arch/x86/Kconfig:597:	symbol HYPERVISOR_GUEST is selected by X86_VSMP
> arch/x86/Kconfig:388:	symbol X86_VSMP depends on PCI
> arch/x86/Kconfig:2042:	symbol PCI is selected by KVM_GUEST_COMMON_OPTIONS

Well, this was the reason why I dropped CONFIG_PCI from
KVM_GUEST_COMMON_OPTIONS in the first place - to not have the circular
dependency splat above and assuming that people simply have CONFIG_PCI
enabled already.

Well, off the top of my head, we could do the following; I'd need to
hammer on it for a while though before it feels ok with all that Kconfig
jumble. Unless someone has a better idea, of course...

---
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index e8fff2f4ecb7..4f8ef85b0633 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -389,7 +389,8 @@ config X86_VSMP
 	bool "ScaleMP vSMP"
 	select HYPERVISOR_GUEST
 	select PARAVIRT
-	depends on X86_64 && PCI
+	select PCI
+	depends on X86_64
 	depends on X86_EXTENDED_PLATFORM
 	depends on SMP
 	---help---
@@ -664,6 +665,7 @@ config KVM_GUEST_COMMON_OPTIONS
 	select IP_PNP
 	select IP_PNP_DHCP
 	select BINFMT_ELF
+	select PCI
 	select PCI_MSI
 	select HAVE_ARCH_KGDB
 	select DEBUG_KERNEL
--

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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