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

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Date:	Thu, 2 May 2013 22:07:03 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	David Rientjes <rientjes@...gle.com>, hpa@...or.com,
	linux-kernel@...r.kernel.org, penberg@...nel.org,
	levinsasha928@...il.com, mtosatti@...hat.com, tglx@...utronix.de,
	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 Thu, May 02, 2013 at 09:45:56PM +0200, Ingo Molnar wrote:
> Boris, mind posting a working version?

Yeah, let's delay it for the next merge window - it looks like it needs
more experimenting and since it is not urgent enough...

FWIW, I did play a bit with it today and I ended up with the diff below
just to satisfy the CONFIG_PCI/MSI deps. However, if I want to shut them
all up, I need to pull in SMP, MODULE_UNLOAD, MODULE... and so on.

Which is kind of an overkill and I really don't want to do it.

I wonder if one can exclude options from randconfig until 'select' has
been taught to resolve dependencies...

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 9dae342fa6f6..4c826ea8dd29 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -390,9 +390,10 @@ config X86_VSMP
        bool "ScaleMP vSMP"
        select HYPERVISOR_GUEST
        select PARAVIRT
-       depends on X86_64 && PCI
+       select PCI
+       select SMP
+       depends on X86_64
        depends on X86_EXTENDED_PLATFORM
-       depends on SMP
        ---help---
          Support for ScaleMP vSMP systems.  Say 'Y' here if this kernel is
          supposed to run on these EM64T-based machines.  Only choose this option
@@ -685,6 +686,7 @@ config KVM_GUEST_COMMON_OPTIONS
        bool "Enable commodity options for a standalone KVM guest"
        depends on KVM_GUEST
        select NET
+       select NET_CORE
        select NETDEVICES
        select BLOCK
        select BLK_DEV
@@ -697,6 +699,12 @@ config KVM_GUEST_COMMON_OPTIONS
        select IP_PNP
        select IP_PNP_DHCP
        select BINFMT_ELF
+#      select SMP
+#      select MODULE_UNLOAD
+       select X86_LOCAL_APIC
+       select X86_IO_APIC
+       select ARCH_SUPPORTS_MSI
+       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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