linux-kernel - Re: [PATCH] [v2] x86: kvm: add back X86_LOCAL

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Message-ID: <ZzTOMFYBVjz3y3ip@google.com>
Date: Wed, 13 Nov 2024 08:05:04 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, Arnd Bergmann <arnd@...db.de>, 
	kernel test robot <lkp@...el.com>, "H. Peter Anvin" <hpa@...or.com>, Michael Roth <michael.roth@....com>, 
	Vitaly Kuznetsov <vkuznets@...hat.com>, Isaku Yamahata <isaku.yamahata@...el.com>, kvm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] x86: kvm: add back X86_LOCAL_APIC dependency

On Wed, Nov 13, 2024, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.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@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202410060426.e9Xsnkvi-lkp@intel.com/
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---

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