Linux kernel 4.16.2 won't compile [closed]

Question

I get the following errors when I try compiling Linux kernel 4.16.1 and 4.16.2:

arch/x86/kvm/svm.o: In function `__sev_issue_cmd':
svm.c:(.text+0x1f08): undefined reference to `sev_issue_cmd_external_user'
arch/x86/kvm/svm.o: In function `sev_unbind_asid':
svm.c:(.text+0x2033): undefined reference to `sev_guest_deactivate'
svm.c:(.text+0x203f): undefined reference to `sev_guest_df_flush'
svm.c:(.text+0x206c): undefined reference to `sev_guest_decommission'
arch/x86/kvm/svm.o: In function `svm_mem_enc_op':
svm.c:(.text+0x2c56): undefined reference to `psp_copy_user_blob'
svm.c:(.text+0x2d4c): undefined reference to `sev_platform_init'
svm.c:(.text+0x2e59): undefined reference to `psp_copy_user_blob'
svm.c:(.text+0x2eea): undefined reference to `sev_guest_df_flush'
svm.c:(.text+0x2f3d): undefined reference to `sev_guest_activate'
svm.c:(.text+0x3001): undefined reference to `psp_copy_user_blob'
svm.c:(.text+0x3054): undefined reference to `psp_copy_user_blob'
arch/x86/kvm/svm.o: In function `svm_hardware_setup':
svm.c:(.init.text+0x263): undefined reference to `sev_platform_status'
make: *** [Makefile:1041: vmlinux] Error 1

Would anyone know what needs to be done to resolve this? I don't have this issue with any previous kernel version.

Answer 1

I needed to compile 'Kernel-based Virtual Machine Support' into the kernel, rather than as a module. Once that was done, the kernel compiled with no problem.