linux-kernel - Re: Undefined reference to `l1tf_vmx_mitigation' without CONFIG_KVM

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Date:   Wed, 15 Aug 2018 12:09:08 +0300
From:   Dmitrii Tcvetkov <demfloro@...floro.ru>
To:     linux-kernel@...r.kernel.org
Subject: Re: Undefined reference to `l1tf_vmx_mitigation' without
 CONFIG_KVM_INTEL

On Wed, 15 Aug 2018 11:42:00 +0300
Dmitrii Tcvetkov <demfloro@...floro.ru> wrote:

> By build testing 4.18.1-rc2 from
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
> linux-4.18.y with my custom kernel config I got build error:
>   CHK     include/generated/autoksyms.h
>   GEN     .version
>   CHK     include/generated/compile.h
>   AR      built-in.a
>   LD      vmlinux.o
>   MODPOST vmlinux.o
> ld: arch/x86/kvm/x86.o: in function `kvm_get_arch_capabilities':
> x86.c:(.text+0x46f2): undefined reference to `l1tf_vmx_mitigation'
> make[1]: *** [Makefile:1010: vmlinux] Error 1
> make: *** [Makefile:979: autoksyms_recursive] Error 2
> 
> Build is successful with
> CONFIG_KVM=y
> CONFIG_KVM_INTEL=y
> CONFIG_KVM_AMD=y
> but fails if only
> CONFIG_KVM=y
> CONFIG_KVM_AMD=y
> are selected.
> 
> The issue also reproduces on current mainline master (31130a16d459de)
> with the same error.

Sorry for the noise, only now saw the patch for the issue:
http://lkml.iu.edu/hypermail/linux/kernel/1808.1/04513.html