linux-kernel - [PATCH 02/14] KVM: monolithic: x86: disable linking vmx and svm at the same time into the kernel

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Date:   Sat, 28 Sep 2019 13:23:11 -0400
From:   Andrea Arcangeli <aarcange@...hat.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: [PATCH 02/14] KVM: monolithic: x86: disable linking vmx and svm at the same time into the kernel

Linking both vmx and svm into the kernel at the same time isn't
possible anymore or the kvm_x86/kvm_x86_pmu external function names
would collide.

Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 arch/x86/kvm/Kconfig | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 840e12583b85..e1601c54355e 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -59,9 +59,29 @@ config KVM
 
 	  If unsure, say N.
 
+if KVM=y
+
+choice
+	prompt "To link KVM statically into the kernel you need to choose"
+	help
+	  In order to build a kernel with support for both AMD and Intel
+	  CPUs, you need to set CONFIG_KVM=m.
+
+config KVM_AMD_STATIC
+	select KVM_AMD
+	bool "Link KVM AMD statically into the kernel"
+
+config KVM_INTEL_STATIC
+	select KVM_INTEL
+	bool "Link KVM Intel statically into the kernel"
+
+endchoice
+
+endif
+
 config KVM_INTEL
 	tristate "KVM for Intel processors support"
-	depends on KVM
+	depends on (KVM && !KVM_AMD_STATIC) || KVM_INTEL_STATIC
 	# for perf_guest_get_msrs():
 	depends on CPU_SUP_INTEL
 	---help---
@@ -73,7 +93,7 @@ config KVM_INTEL
 
 config KVM_AMD
 	tristate "KVM for AMD processors support"
-	depends on KVM
+	depends on (KVM && !KVM_INTEL_STATIC) || KVM_AMD_STATIC
 	---help---
 	  Provides support for KVM on AMD processors equipped with the AMD-V
 	  (SVM) extensions.