Re: ERROR: modpost: "kvm_free_tlb_tag" [arch/x86/kvm/kvm-intel.ko] undefined!

[Sean Christopherson <seanjc@google.com>]

On Tue, Jun 16, 2026, Yosry Ahmed wrote:
> On Tue, Jun 16, 2026 at 4:21 AM kernel test robot <lkp@intel.com> wrote:
> >
> > Hi Yosry,
> >
> > FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.
> >
> > tree:   https://github.com/intel-lab-lkp/linux/commits/Yosry-Ahmed/KVM-nSVM-Flush-the-TLB-after-forcefully-leaving-nested/20260616-104539
> > head:   8ffd2ccdf3cac4abc0d2fd686f0ec3c7a453a24a
> > commit: c431a77735b3877be989d51a32b73ef4e80902ca KVM: VMX: Generalize VPID allocation to be vendor-neutral
> > date:   9 hours ago
> > config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260616/202606161302.xMRLP5W1-lkp@intel.com/config)
> > compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project f43d6834093b19baf79beda8c0337ab020ac5f17)
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260616/202606161302.xMRLP5W1-lkp@intel.com/reproduce)
> >
> > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > the same patch/commit), kindly add following tags
> > | Reported-by: kernel test robot <lkp@intel.com>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202606161302.xMRLP5W1-lkp@intel.com/
> >
> > All errors (new ones prefixed by >>, old ones prefixed by <<):
> >
> > >> ERROR: modpost: "kvm_free_tlb_tag" [arch/x86/kvm/kvm-intel.ko] undefined!
> > >> ERROR: modpost: "kvm_alloc_tlb_tag" [arch/x86/kvm/kvm-intel.ko] undefined!
> > >> ERROR: modpost: "kvm_destroy_tlb_tags" [arch/x86/kvm/kvm-intel.ko] undefined!
> > >> ERROR: modpost: "kvm_init_tlb_tags" [arch/x86/kvm/kvm-intel.ko] undefined!
> 
> Hmm I used EXPORT_SYMBOL_FOR_KVM_INTERNAL() for all these symbols. Is
> this not the right way to do this?

You put them inside an CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES #ifdef.