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

[Chris Clayton <chris2553-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>]

On Saturday 14 July 2007, Anthony Liguori wrote:
> 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.
>

To select that I have to specify (in make menuconfig) that I have more than 4 
gigabytes of RAM, when actually I have 2 gigabytes. It's the only way I can 
find to get CONFIG_X86_PAE selected, but means I must ignore the help text 
offered around CONFIG_HIGHMEM4G/64G.

Have I got that right, please? 

Thanks

Chris

> 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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