Re: kvm-29 and linux 2.6.22.1-cfs-v19

[Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>]

Chris Clayton wrote:
> Hi,
>
> I'm building kvm-29 on a system that is running linux-2.6.22.1-cfs-v19. When 
> the modules are built I get warnings about set_64bit:
>
>   CC [M]  /home/users/chris/rpm/BUILD/kvm-29/kernel/vmx-debug.o
>   CC [M]  /home/users/chris/rpm/BUILD/kvm-29/kernel/kvm_main.o
>   CC [M]  /home/users/chris/rpm/BUILD/kvm-29/kernel/mmu.o
> /home/users/chris/rpm/BUILD/kvm-29/kernel/mmu.c: In function 'set_shadow_pte':
> /home/users/chris/rpm/BUILD/kvm-29/kernel/mmu.c:202: warning: implicit 
> declaration of function 'set_64bit'
>   CC [M]  /home/users/chris/rpm/BUILD/kvm-29/kernel/x86_emulate.o
>   CC [M]  /home/users/chris/rpm/BUILD/kvm-29/kernel/anon_inodes.o
>   LD [M]  /home/users/chris/rpm/BUILD/kvm-29/kernel/kvm.o
>   LD [M]  /home/users/chris/rpm/BUILD/kvm-29/kernel/kvm-intel.o
>   LD [M]  /home/users/chris/rpm/BUILD/kvm-29/kernel/kvm-amd.o
>   Building modules, stage 2.
>   MODPOST 3 modules
> WARNING: "set_64bit" [/home/users/chris/rpm/BUILD/kvm-29/kernel/kvm.ko] 
> undefined!
>   CC      /home/users/chris/rpm/BUILD/kvm-29/kernel/kvm-amd.mod.o
>   CC      /home/users/chris/rpm/BUILD/kvm-29/kernel/kvm-intel.mod.o
>   CC      /home/users/chris/rpm/BUILD/kvm-29/kernel/kvm.mod.o
>   LD [M]  /home/users/chris/rpm/BUILD/kvm-29/kernel/kvm-amd.ko
>   LD [M]  /home/users/chris/rpm/BUILD/kvm-29/kernel/kvm-intel.ko
>   LD [M]  /home/users/chris/rpm/BUILD/kvm-29/kernel/kvm.ko
> m
> Because set_64bit is undefined, kvm.ko (and kvm-intel.ko) can't be loaded.
>
> I've found the set_64bit in the kernel sources - it's a macro in 
> asm-i386/cmpxchg.h. The problem is that the macro(and some realted macros and 
> definitions are guarded by "#ifdef  CONFIG_X86_CMPXCHG64". Since that isn't 
> defined for my kernel, set_64bit is not defined either.
>   

KVM depends on CONFIG_X86_CMPXCHG64 which also depends on CONFIG_X86_PAE.

Regards,

Anthony Liguori

> If I comment the guarding #ifdef (and its partner #endif) kvm builds fine and 
> everything seems to work OK.- the modules load and Damn Small Linux and 
> FreeBSD run fine.
>
> Any advice would be much appreciated and more than happy to test patches.
>
> I'm not subscribed, so please cc me.
>
> Thanks
>
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