linux-kernel - [PATCH 2/2] KVM: x86: Break CONFIG_KVM_X86's direct dependency on KVM_INTEL || KVM

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Message-ID: <20241118172002.1633824-3-seanjc@google.com>
Date: Mon, 18 Nov 2024 09:20:02 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 2/2] KVM: x86: Break CONFIG_KVM_X86's direct dependency on
 KVM_INTEL || KVM_AMD

Rework CONFIG_KVM_X86's dependency to only check if KVM_INTEL or KVM_AMD
is selected, i.e. not 'n'.  Having KVM_X86 depend directly on the vendor
modules results in KVM_X86 being set to 'm' if at least one of KVM_INTEL
or KVM_AMD is enabled, but neither is 'y', regardless of the value of KVM
itself.

The documentation for def_tristate doesn't explicitly state that this is
the intended behavior, but it does clearly state that the "if" section is
parsed as a dependency, i.e. the behavior is consistent with how tristate
dependencies are handled in general.

  Optionally dependencies for this default value can be added with "if".

Fixes: ea4290d77bda ("KVM: x86: leave kvm.ko out of the build if no vendor module is requested")
Cc: stable@...r.kernel.org
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 887df30297f3..b91ec2e9c916 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -18,7 +18,7 @@ menuconfig VIRTUALIZATION
 if VIRTUALIZATION

 config KVM_X86
-	def_tristate KVM if KVM_INTEL || KVM_AMD
+	def_tristate KVM if (KVM_INTEL != n || KVM_AMD != n)
 	select KVM_COMMON
 	select KVM_GENERIC_MMU_NOTIFIER
 	select HAVE_KVM_IRQCHIP
-- 
2.47.0.338.g60cca15819-goog