Hi all, This is the v2 of the series previously posted here: https://lore.kernel.org/kvmarm/20201117181607.1761516-1-qperret@xxxxxxxxxx/ This basically allows us to wrap the host with a stage 2 when running in nVHE, hence paving the way for protecting guest memory from the host in the future (among other use-cases). For more details about the motivation and the design angle taken here, I would recommend to have a look at the cover letter of v1, and/or to watch these presentations at LPC [1] and KVM forum 2020 [2]. In short, the changes since v1 include: - Renamed most pkvm-specific pgtable functions as pkvm_* to avoid confusion with the host's (Fuad) - Added an IC flush when switching pgtables (Fuad, Mark) - Cleaned-up the PI aliasing in image-vars.h (David) - Added a TLB flush when enabling the host stage 2 to avoid stale TLBs from bootloader - Fixed the early memory reservation by using NR_CPUS instead of num_possible_cpus() (which is always 1 that early) - Added missing preempt_{dis,en}able() guards in kvm_hyp_enable_protection() - Rebased on latest kvmarm/next And if you'd like a branch that has all the goodies, there it is: https://android-kvm.googlesource.com/linux qperret/host-stage2-v2 Thanks! Quentin [1] https://youtu.be/54q6RzS9BpQ?t=10859 [2] https://kvmforum2020.sched.com/event/eE24/virtualization-for-the-masses-exposing-kvm-on-android-will-deacon-google Quentin Perret (23): KVM: arm64: Initialize kvm_nvhe_init_params early KVM: arm64: Avoid free_page() in page-table allocator KVM: arm64: Factor memory allocation out of pgtable.c KVM: arm64: Introduce a BSS section for use at Hyp KVM: arm64: Make kvm_call_hyp() a function call at Hyp KVM: arm64: Allow using kvm_nvhe_sym() in hyp code KVM: arm64: Introduce an early Hyp page allocator KVM: arm64: Stub CONFIG_DEBUG_LIST at Hyp KVM: arm64: Introduce a Hyp buddy page allocator KVM: arm64: Enable access to sanitized CPU features at EL2 KVM: arm64: Factor out vector address calculation of/fdt: Introduce early_init_dt_add_memory_hyp() KVM: arm64: Prepare Hyp memory protection KVM: arm64: Elevate Hyp mappings creation at EL2 KVM: arm64: Use kvm_arch for stage 2 pgtable KVM: arm64: Use kvm_arch in kvm_s2_mmu KVM: arm64: Set host stage 2 using kvm_nvhe_init_params KVM: arm64: Refactor kvm_arm_setup_stage2() KVM: arm64: Refactor __load_guest_stage2() KVM: arm64: Refactor __populate_fault_info() KVM: arm64: Make memcache anonymous in pgtable allocator KVM: arm64: Reserve memory for host stage 2 KVM: arm64: Wrap the host with a stage 2 Will Deacon (3): arm64: lib: Annotate {clear,copy}_page() as position-independent KVM: arm64: Link position-independent string routines into .hyp.text arm64: kvm: Add standalone ticket spinlock implementation for use at hyp arch/arm64/include/asm/cpufeature.h | 1 + arch/arm64/include/asm/hyp_image.h | 7 + arch/arm64/include/asm/kvm_asm.h | 7 + arch/arm64/include/asm/kvm_cpufeature.h | 19 ++ arch/arm64/include/asm/kvm_host.h | 16 +- arch/arm64/include/asm/kvm_hyp.h | 8 + arch/arm64/include/asm/kvm_mmu.h | 69 +++++- arch/arm64/include/asm/kvm_pgtable.h | 41 +++- arch/arm64/include/asm/sections.h | 1 + arch/arm64/kernel/asm-offsets.c | 3 + arch/arm64/kernel/cpufeature.c | 12 + arch/arm64/kernel/image-vars.h | 33 +++ arch/arm64/kernel/vmlinux.lds.S | 7 + arch/arm64/kvm/arm.c | 144 ++++++++++-- arch/arm64/kvm/hyp/Makefile | 2 +- arch/arm64/kvm/hyp/include/hyp/switch.h | 36 +-- arch/arm64/kvm/hyp/include/nvhe/early_alloc.h | 14 ++ arch/arm64/kvm/hyp/include/nvhe/gfp.h | 32 +++ arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 33 +++ arch/arm64/kvm/hyp/include/nvhe/memory.h | 55 +++++ arch/arm64/kvm/hyp/include/nvhe/mm.h | 107 +++++++++ arch/arm64/kvm/hyp/include/nvhe/spinlock.h | 92 ++++++++ arch/arm64/kvm/hyp/nvhe/Makefile | 9 +- arch/arm64/kvm/hyp/nvhe/cache.S | 13 ++ arch/arm64/kvm/hyp/nvhe/cpufeature.c | 8 + arch/arm64/kvm/hyp/nvhe/early_alloc.c | 60 +++++ arch/arm64/kvm/hyp/nvhe/hyp-init.S | 41 ++++ arch/arm64/kvm/hyp/nvhe/hyp-main.c | 48 ++++ arch/arm64/kvm/hyp/nvhe/hyp.lds.S | 1 + arch/arm64/kvm/hyp/nvhe/mem_protect.c | 191 ++++++++++++++++ arch/arm64/kvm/hyp/nvhe/mm.c | 174 ++++++++++++++ arch/arm64/kvm/hyp/nvhe/page_alloc.c | 185 +++++++++++++++ arch/arm64/kvm/hyp/nvhe/psci-relay.c | 4 +- arch/arm64/kvm/hyp/nvhe/setup.c | 214 ++++++++++++++++++ arch/arm64/kvm/hyp/nvhe/stub.c | 22 ++ arch/arm64/kvm/hyp/nvhe/switch.c | 12 +- arch/arm64/kvm/hyp/nvhe/tlb.c | 4 +- arch/arm64/kvm/hyp/pgtable.c | 98 ++++---- arch/arm64/kvm/hyp/reserved_mem.c | 104 +++++++++ arch/arm64/kvm/mmu.c | 114 +++++++++- arch/arm64/kvm/reset.c | 42 +--- arch/arm64/lib/clear_page.S | 4 +- arch/arm64/lib/copy_page.S | 4 +- arch/arm64/mm/init.c | 3 + drivers/of/fdt.c | 5 + 45 files changed, 1954 insertions(+), 145 deletions(-) create mode 100644 arch/arm64/include/asm/kvm_cpufeature.h create mode 100644 arch/arm64/kvm/hyp/include/nvhe/early_alloc.h create mode 100644 arch/arm64/kvm/hyp/include/nvhe/gfp.h create mode 100644 arch/arm64/kvm/hyp/include/nvhe/mem_protect.h create mode 100644 arch/arm64/kvm/hyp/include/nvhe/memory.h create mode 100644 arch/arm64/kvm/hyp/include/nvhe/mm.h create mode 100644 arch/arm64/kvm/hyp/include/nvhe/spinlock.h create mode 100644 arch/arm64/kvm/hyp/nvhe/cache.S create mode 100644 arch/arm64/kvm/hyp/nvhe/cpufeature.c create mode 100644 arch/arm64/kvm/hyp/nvhe/early_alloc.c create mode 100644 arch/arm64/kvm/hyp/nvhe/mem_protect.c create mode 100644 arch/arm64/kvm/hyp/nvhe/mm.c create mode 100644 arch/arm64/kvm/hyp/nvhe/page_alloc.c create mode 100644 arch/arm64/kvm/hyp/nvhe/setup.c create mode 100644 arch/arm64/kvm/hyp/nvhe/stub.c create mode 100644 arch/arm64/kvm/hyp/reserved_mem.c -- 2.30.0.284.gd98b1dd5eaa7-goog _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
