• David Brazdil's avatar
    KVM: arm64: Add build rules for separate VHE/nVHE object files · 76217129
    David Brazdil authored
    Add new folders arch/arm64/kvm/hyp/{vhe,nvhe} and Makefiles for building code
    that runs in EL2 under VHE/nVHE KVM, repsectivelly. Add an include folder for
    hyp-specific header files which will include code common to VHE/nVHE.
    
    Build nVHE code with -D__KVM_NVHE_HYPERVISOR__, VHE code with
    -D__KVM_VHE_HYPERVISOR__.
    
    Under nVHE compile each source file into a `.hyp.tmp.o` object first, then
    prefix all its symbols with "__kvm_nvhe_" using `objcopy` and produce
    a `.hyp.o`. Suffixes were chosen so that it would be possible for VHE and nVHE
    to share some source files, but compiled with different CFLAGS.
    
    The nVHE ELF symbol prefix is added to kallsyms.c as ignored. EL2-only symbols
    will never appear in EL1 stack traces.
    
    Due to symbol prefixing, add a section in image-vars.h for aliases of symbols
    that are defined in nVHE EL2 and accessed by kernel in EL1 or vice versa.
    Signed-off-by: default avatarDavid Brazdil <dbrazdil@google.com>
    Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
    Link: https://lore.kernel.org/r/20200625131420.71444-4-dbrazdil@google.com
    76217129
image-vars.h 2.05 KB