[PATCH] [v2] x86: kvm: add back X86_LOCAL_APIC dependency

[PATCH] [v2] x86: kvm: add back X86_LOCAL_APIC dependency

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

Enabling KVM now causes a build failure on x86-32 if X86_LOCAL_APIC
is disabled:

arch/x86/kvm/svm/svm.c: In function 'svm_emergency_disable_virtualization_cpu':
arch/x86/kvm/svm/svm.c:597:9: error: 'kvm_rebooting' undeclared (first use in this function); did you mean 'kvm_irq_routing'?
  597 |         kvm_rebooting = true;
      |         ^~~~~~~~~~~~~
      |         kvm_irq_routing
arch/x86/kvm/svm/svm.c:597:9: note: each undeclared identifier is reported only once for each function it appears in
make[6]: *** [scripts/Makefile.build:221: arch/x86/kvm/svm/svm.o] Error 1
In file included from include/linux/rculist.h:11,
                 from include/linux/hashtable.h:14,
                 from arch/x86/kvm/svm/avic.c:18:
arch/x86/kvm/svm/avic.c: In function 'avic_pi_update_irte':
arch/x86/kvm/svm/avic.c:909:38: error: 'struct kvm' has no member named 'irq_routing'
  909 |         irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
      |                                      ^~
include/linux/rcupdate.h:538:17: note: in definition of macro '__rcu_dereference_check'
  538 |         typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \

Move the dependency to the same place as before.

Fixes: ea4290d77bda ("KVM: x86: leave kvm.ko out of the build if no vendor module is requested")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202410060426.e9Xsnkvi-lkp@intel.com/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
[v2] move the depdendency again, to CONFIG_KVM
---
 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 1ed1e4f5d51c..d79e907b8e77 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -19,7 +19,6 @@ if VIRTUALIZATION
 
 config KVM_X86
 	def_tristate KVM if KVM_INTEL || KVM_AMD
-	depends on X86_LOCAL_APIC
 	select KVM_COMMON
 	select KVM_GENERIC_MMU_NOTIFIER
 	select KVM_ELIDE_TLB_FLUSH_IF_YOUNG
@@ -50,6 +49,7 @@ config KVM_X86
 
 config KVM
 	tristate "Kernel-based Virtual Machine (KVM) support"
+	depends on X86_LOCAL_APIC
 	help
 	  Support hosting fully virtualized guest machines using hardware
 	  virtualization extensions.  You will need a fairly recent
-- 
2.39.5

Re: [PATCH] [v2] x86: kvm: add back X86_LOCAL_APIC dependency

[Sean Christopherson]

On Wed, Nov 13, 2024, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> Enabling KVM now causes a build failure on x86-32 if X86_LOCAL_APIC
> is disabled:
> 
> arch/x86/kvm/svm/svm.c: In function 'svm_emergency_disable_virtualization_cpu':
> arch/x86/kvm/svm/svm.c:597:9: error: 'kvm_rebooting' undeclared (first use in this function); did you mean 'kvm_irq_routing'?
>   597 |         kvm_rebooting = true;
>       |         ^~~~~~~~~~~~~
>       |         kvm_irq_routing
> arch/x86/kvm/svm/svm.c:597:9: note: each undeclared identifier is reported only once for each function it appears in
> make[6]: *** [scripts/Makefile.build:221: arch/x86/kvm/svm/svm.o] Error 1
> In file included from include/linux/rculist.h:11,
>                  from include/linux/hashtable.h:14,
>                  from arch/x86/kvm/svm/avic.c:18:
> arch/x86/kvm/svm/avic.c: In function 'avic_pi_update_irte':
> arch/x86/kvm/svm/avic.c:909:38: error: 'struct kvm' has no member named 'irq_routing'
>   909 |         irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
>       |                                      ^~
> include/linux/rcupdate.h:538:17: note: in definition of macro '__rcu_dereference_check'
>   538 |         typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
> 
> Move the dependency to the same place as before.
> 
> Fixes: ea4290d77bda ("KVM: x86: leave kvm.ko out of the build if no vendor module is requested")
> Reported-by: kernel test robot <lkp@intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202410060426.e9Xsnkvi-lkp@intel.com/
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---

Acked-by: Sean Christopherson <seanjc@google.com>