Refactor files in arch/arm64/kvm/hyp to compile all code which runs in EL2 under nVHE into separate object files from the rest of KVM. This is done in preparation for being able to unmap hyp code from EL1 and kernel code/data from EL2 but has other benefits too, notably: * safe use of KASAN/UBSAN/GCOV instrumentation on VHE code, * cleaner HVC API, * no need for __hyp_text annotations. nVHE-specific code is moved to hyp/nvhe and compiled with custom build rules similar to those used by EFI stub. Shared source files are compiled under both VHE and nVHE build rules. Where a source file contained both VHE and nVHE code, it is split into a shared header file and two C source files. This is done one file per commit to make review easier. All nVHE symbols are prefixed with "__kvm_nvhe_" to avoid collisions with VHE variants (also inspired by EFI stub). Since this prefixes unresolved symbols too, image-vars.h contains a list of kernel symbol aliases where nVHE code still refers to kernel proper. The list grows fairly large as the patch series progresses and code is moved around, but at the end contains 17 symbols. These remaining dependencies on kernel proper will be further reduced in the future. No functional changes are intended but code was simplified whenever the refactoring made it possible. Tested by running kvm-unit-tests on QEMU 5.0 with VHE/nVHE and GIC v2/v3. Dual compilation of code shared by VHE/nVHE increase the size of the kernel. Bloat-o-meter vmlinux diff shows an increase of 21 KB on the ELF symbol level. Size of Image.gz is up by 10 KB; size of Image is unchanged, presumably due to ELF section alignment. This is based off Fuad Tabba's patch series "KVM: arm64: Tidy up arch Kconfig and Makefiles". Available in branch 'topic/el2-obj-v2' of git repo: https://android-kvm.googlesource.com/linux Changes v1 -> v2: * change nVHE symbol prefix from __hyp_text_ to __kvm_nvhe_ * rename __HYPERVISOR__ macro to __KVM_NVHE_HYPERVISOR__ * use hcall jump table instead of array of function pointers * drop patch to unify HVC callers * move __smccc_workaround_1_smc to own file * header guards for hyp/*.h * improve helpers for handling VHE/nVHE hyp syms in kernel proper * improve commit messages, cover letter -David David Brazdil (14): arm64: kvm: Fix symbol dependency in __hyp_call_panic_nvhe arm64: kvm: Move __smccc_workaround_1_smc to .rodata arm64: kvm: Formalize hypcall ABI arm64: kvm: Add build rules for separate nVHE object files arm64: kvm: Build hyp-entry.S separately for VHE/nVHE arm64: kvm: Split hyp/tlb.c to VHE/nVHE arm64: kvm: Split hyp/switch.c to VHE/nVHE arm64: kvm: Split hyp/debug-sr.c to VHE/nVHE arm64: kvm: Split hyp/sysreg-sr.c to VHE/nVHE arm64: kvm: Split hyp/timer-sr.c to VHE/nVHE arm64: kvm: Compile remaining hyp/ files for both VHE/nVHE arm64: kvm: Add comments around __kvm_nvhe_ symbol aliases arm64: kvm: Remove __hyp_text macro, use build rules instead arm64: kvm: Lift instrumentation restrictions on VHE arch/arm64/include/asm/kvm_asm.h | 29 +- arch/arm64/include/asm/kvm_emulate.h | 2 +- arch/arm64/include/asm/kvm_host.h | 12 +- arch/arm64/include/asm/kvm_host_hypercalls.h | 59 ++ arch/arm64/include/asm/kvm_hyp.h | 15 +- arch/arm64/include/asm/kvm_mmu.h | 16 +- arch/arm64/include/asm/mmu.h | 7 - arch/arm64/kernel/cpu_errata.c | 4 +- arch/arm64/kernel/image-vars.h | 43 ++ arch/arm64/kvm/arm.c | 6 +- arch/arm64/kvm/hyp.S | 18 +- arch/arm64/kvm/hyp/Makefile | 13 +- arch/arm64/kvm/hyp/aarch32.c | 6 +- arch/arm64/kvm/hyp/debug-sr.c | 214 +----- arch/arm64/kvm/hyp/debug-sr.h | 170 +++++ arch/arm64/kvm/hyp/entry.S | 1 - arch/arm64/kvm/hyp/fpsimd.S | 1 - arch/arm64/kvm/hyp/hyp-entry.S | 77 +-- arch/arm64/kvm/hyp/nvhe/Makefile | 42 ++ arch/arm64/kvm/hyp/nvhe/debug-sr.c | 77 +++ arch/arm64/kvm/hyp/nvhe/switch.c | 271 ++++++++ arch/arm64/kvm/hyp/nvhe/sysreg-sr.c | 56 ++ arch/arm64/kvm/hyp/nvhe/timer-sr.c | 43 ++ arch/arm64/kvm/hyp/nvhe/tlb.c | 67 ++ arch/arm64/kvm/hyp/smccc_wa.S | 30 + arch/arm64/kvm/hyp/switch.c | 688 +------------------ arch/arm64/kvm/hyp/switch.h | 443 ++++++++++++ arch/arm64/kvm/hyp/sysreg-sr.c | 233 +------ arch/arm64/kvm/hyp/sysreg-sr.h | 216 ++++++ arch/arm64/kvm/hyp/timer-sr.c | 38 +- arch/arm64/kvm/hyp/tlb.c | 168 +---- arch/arm64/kvm/hyp/tlb.h | 131 ++++ arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c | 4 +- arch/arm64/kvm/hyp/vgic-v3-sr.c | 130 ++-- arch/arm64/kvm/va_layout.c | 2 +- scripts/kallsyms.c | 1 + 36 files changed, 1867 insertions(+), 1466 deletions(-) create mode 100644 arch/arm64/include/asm/kvm_host_hypercalls.h create mode 100644 arch/arm64/kvm/hyp/debug-sr.h create mode 100644 arch/arm64/kvm/hyp/nvhe/Makefile create mode 100644 arch/arm64/kvm/hyp/nvhe/debug-sr.c create mode 100644 arch/arm64/kvm/hyp/nvhe/switch.c create mode 100644 arch/arm64/kvm/hyp/nvhe/sysreg-sr.c create mode 100644 arch/arm64/kvm/hyp/nvhe/timer-sr.c create mode 100644 arch/arm64/kvm/hyp/nvhe/tlb.c create mode 100644 arch/arm64/kvm/hyp/smccc_wa.S create mode 100644 arch/arm64/kvm/hyp/switch.h create mode 100644 arch/arm64/kvm/hyp/sysreg-sr.h create mode 100644 arch/arm64/kvm/hyp/tlb.h -- 2.26.2 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
