From ea4290d77bda2bd1f173a86f07aa79b568e0a6f8 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Tue, 1 Oct 2024 10:15:01 -0400 Subject: [PATCH] KVM: x86: leave kvm.ko out of the build if no vendor module is requested kvm.ko is nothing but library code shared by kvm-intel.ko and kvm-amd.ko. It provides no functionality on its own and it is unnecessary unless one of the vendor-specific module is compiled. In particular, /dev/kvm is not created until one of kvm-intel.ko or kvm-amd.ko is loaded. Use CONFIG_KVM to decide if it is built-in or a module, but use the vendor-specific modules for the actual decision on whether to build it. This also fixes a build failure when CONFIG_KVM_INTEL and CONFIG_KVM_AMD are both disabled. The cpu_emergency_register_virt_callback() function is called from kvm.ko, but it is only defined if at least one of CONFIG_KVM_INTEL and CONFIG_KVM_AMD is provided. Fixes: 590b09b1d88e ("KVM: x86: Register "emergency disable" callbacks when virt is enabled") Signed-off-by: Paolo Bonzini --- arch/x86/kvm/Kconfig | 9 ++++++--- arch/x86/kvm/Makefile | 2 +- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index 730c2f34d347..f09f13c01c6b 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -17,8 +17,8 @@ menuconfig VIRTUALIZATION if VIRTUALIZATION -config KVM - tristate "Kernel-based Virtual Machine (KVM) support" +config KVM_X86 + def_tristate KVM if KVM_INTEL || KVM_AMD depends on X86_LOCAL_APIC select KVM_COMMON select KVM_GENERIC_MMU_NOTIFIER @@ -44,7 +44,11 @@ config KVM select HAVE_KVM_PM_NOTIFIER if PM select KVM_GENERIC_HARDWARE_ENABLING select KVM_GENERIC_PRE_FAULT_MEMORY + select KVM_GENERIC_PRIVATE_MEM if KVM_SW_PROTECTED_VM select KVM_WERROR if WERROR + +config KVM + tristate "Kernel-based Virtual Machine (KVM) support" help Support hosting fully virtualized guest machines using hardware virtualization extensions. You will need a fairly recent @@ -77,7 +81,6 @@ config KVM_SW_PROTECTED_VM bool "Enable support for KVM software-protected VMs" depends on EXPERT depends on KVM && X86_64 - select KVM_GENERIC_PRIVATE_MEM help Enable support for KVM software-protected VMs. Currently, software- protected VMs are purely a development and testing vehicle for diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile index 5494669a055a..f9dddb8cb466 100644 --- a/arch/x86/kvm/Makefile +++ b/arch/x86/kvm/Makefile @@ -32,7 +32,7 @@ kvm-intel-y += vmx/vmx_onhyperv.o vmx/hyperv_evmcs.o kvm-amd-y += svm/svm_onhyperv.o endif -obj-$(CONFIG_KVM) += kvm.o +obj-$(CONFIG_KVM_X86) += kvm.o obj-$(CONFIG_KVM_INTEL) += kvm-intel.o obj-$(CONFIG_KVM_AMD) += kvm-amd.o -- 2.39.5