"struct kvm_*" are declared in linux/kvm.h, and were not being included nor forward declared in the header file were it was being used. Change-Id: I511bad19882450f8ecdd6b5efb687026d0fd94ca Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/46321 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>