On 05/05/20 00:06, Peter Xu wrote: > I got this error when building kvm selftests: > > /usr/bin/ld: > /home/xz/git/linux/tools/testing/selftests/kvm/libkvm.a(vmx.o):/home/xz/git/linux/tools/testing/selftests/kvm/include/evmcs.h:222: > multiple definition of `current_evmcs'; > /tmp/cco1G48P.o:/home/xz/git/linux/tools/testing/selftests/kvm/include/evmcs.h:222: > first defined here > /usr/bin/ld: > /home/xz/git/linux/tools/testing/selftests/kvm/libkvm.a(vmx.o):/home/xz/git/linux/tools/testing/selftests/kvm/include/evmcs.h:223: > multiple definition of `current_vp_assist'; > /tmp/cco1G48P.o:/home/xz/git/linux/tools/testing/selftests/kvm/include/evmcs.h:223: > first defined here > > I think it's because evmcs.h is included both in a test file and a lib file so > the structs have multiple declarations when linking. After all it's not a > good > habit to declare structs in the header files. > > Cc: Vitaly Kuznetsov <[email protected]> > Signed-off-by: Peter Xu <[email protected]> > --- > > I initially thought it was something about my GCC 10 upgrade that I recently > did to my laptop - gcc10 even fails the build of the latest kernel after > all (though it turns out to be a kernel bug on build system rather than a gcc > bug). but I'm not sure about this one... > --- > tools/testing/selftests/kvm/include/evmcs.h | 4 ++-- > tools/testing/selftests/kvm/lib/x86_64/vmx.c | 3 +++ > 2 files changed, 5 insertions(+), 2 deletions(-) > > diff --git a/tools/testing/selftests/kvm/include/evmcs.h > b/tools/testing/selftests/kvm/include/evmcs.h > index d8f4d6bfe05d..a034438b6266 100644 > --- a/tools/testing/selftests/kvm/include/evmcs.h > +++ b/tools/testing/selftests/kvm/include/evmcs.h > @@ -219,8 +219,8 @@ struct hv_enlightened_vmcs { > #define HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_MASK \ > (~((1ull << HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT) - 1)) > > -struct hv_enlightened_vmcs *current_evmcs; > -struct hv_vp_assist_page *current_vp_assist; > +extern struct hv_enlightened_vmcs *current_evmcs; > +extern struct hv_vp_assist_page *current_vp_assist; > > int vcpu_enable_evmcs(struct kvm_vm *vm, int vcpu_id); > > diff --git a/tools/testing/selftests/kvm/lib/x86_64/vmx.c > b/tools/testing/selftests/kvm/lib/x86_64/vmx.c > index 6f17f69394be..4ae104f6ce69 100644 > --- a/tools/testing/selftests/kvm/lib/x86_64/vmx.c > +++ b/tools/testing/selftests/kvm/lib/x86_64/vmx.c > @@ -17,6 +17,9 @@ > > bool enable_evmcs; > > +struct hv_enlightened_vmcs *current_evmcs; > +struct hv_vp_assist_page *current_vp_assist; > + > struct eptPageTableEntry { > uint64_t readable:1; > uint64_t writable:1; >
Queued, thanks. Paolo
