kvm fail to compile with CONFIG_DMAR=y

kvm fail to compile with CONFIG_DMAR=y

[Xu, Jiajun]

Hi,
We found against latest kvm commit, 2c775aece4cb3a05aa5dc8b9966b39a959252dcd, kvm failed to compile with CONFIG_DMAR=y.

The error is like following:

[root@kvm-build kernel]# make
rm -f include/asm include-compat/asm
ln -sf asm-x86 include/asm
ln -sf asm-x86 include-compat/asm
make -j20 -C /lib/modules/2.6.28-rc6/build M=`pwd` \
                LINUXINCLUDE="-I`pwd`/include -Iinclude \
                 \
                -Iarch/x86/include -I`pwd`/include-compat \
                -include include/linux/autoconf.h \
                -include `pwd`/x86/external-module-compat.h "
make[1]: Entering directory `/mnt/sdb1/kernel/src/redhat/BUILD/kernel-2.6.28rc6'
make[3]: *** No rule to make target `/workspace/ia32e/nightly/kvm-master-2.6.28-rc6-20090105091035882/kvm-userspace/kernel/x86/vtd.o', needed by `/workspace/ia32e/nightly/kvm-master-2.6.28-rc6-20090105091035882/kvm-userspace/kernel/x86/kvm.o'.  Stop.
make[2]: *** [/workspace/ia32e/nightly/kvm-master-2.6.28-rc6-20090105091035882/kvm-userspace/kernel/x86] Error 2
make[1]: *** [_module_/workspace/ia32e/nightly/kvm-master-2.6.28-rc6-20090105091035882/kvm-userspace/kernel] Error 2
make[1]: Leaving directory `/mnt/sdb1/kernel/src/redhat/BUILD/kernel-2.6.28rc6'
make: *** [all] Error 2

My host kernel is 2.6.28-rc6. After setting CONFIG_DMAR=n, kvm compile is OK. So does anyone know how to enable VT-d in latest kvm?


Best Regards
Jiajun

Re: kvm fail to compile with CONFIG_DMAR=y

[Mark McLoughlin]

On Tue, 2009-01-06 at 09:29 +0800, Xu, Jiajun wrote:

> Hi,
> We found against latest kvm commit,
> 2c775aece4cb3a05aa5dc8b9966b39a959252dcd, kvm failed to compile with
> CONFIG_DMAR=y.
> 
> The error is like following:
> 
> [root@kvm-build kernel]# make
> rm -f include/asm include-compat/asm
> ln -sf asm-x86 include/asm
> ln -sf asm-x86 include-compat/asm
> make -j20 -C /lib/modules/2.6.28-rc6/build M=`pwd` \
>                 LINUXINCLUDE="-I`pwd`/include -Iinclude \
>                  \
>                 -Iarch/x86/include -I`pwd`/include-compat \
>                 -include include/linux/autoconf.h \
>                 -include `pwd`/x86/external-module-compat.h "
> make[1]: Entering directory `/mnt/sdb1/kernel/src/redhat/BUILD/kernel-2.6.28rc6'
> make[3]: *** No rule to make target `/workspace/ia32e/nightly/kvm-master-2.6.28-rc6-20090105091035882/kvm-userspace/kernel/x86/vtd.o', needed by `/workspace/ia32e/nightly/kvm-master-2.6.28-rc6-20090105091035882/kvm-userspace/kernel/x86/kvm.o'.  Stop.
> make[2]: *** [/workspace/ia32e/nightly/kvm-master-2.6.28-rc6-20090105091035882/kvm-userspace/kernel/x86] Error 2
> make[1]: *** [_module_/workspace/ia32e/nightly/kvm-master-2.6.28-rc6-20090105091035882/kvm-userspace/kernel] Error 2
> make[1]: Leaving directory `/mnt/sdb1/kernel/src/redhat/BUILD/kernel-2.6.28rc6'
> make: *** [all] Error 2
> 
> My host kernel is 2.6.28-rc6. After setting CONFIG_DMAR=n, kvm compile
> is OK. So does anyone know how to enable VT-d in latest kvm?

This is because virt/kvm/vt-d.c was renamed to virt/kvm/iommu.c

Try manually deleting the stale copy of vt-d.c and re-running make.

Cheers,
Mark.