diff options
Diffstat (limited to 'arch/arm64/kvm/hyp/nvhe')
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/.gitignore | 2 | ||||
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/Makefile | 60 | ||||
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/hyp.lds.S | 19 | ||||
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/switch.c | 15 |
4 files changed, 62 insertions, 34 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/.gitignore b/arch/arm64/kvm/hyp/nvhe/.gitignore new file mode 100644 index 000000000000..695d73d0249e --- /dev/null +++ b/arch/arm64/kvm/hyp/nvhe/.gitignore @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +hyp.lds diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile index 46c89e8c30bc..ddde15fe85f2 100644 --- a/arch/arm64/kvm/hyp/nvhe/Makefile +++ b/arch/arm64/kvm/hyp/nvhe/Makefile @@ -10,40 +10,46 @@ obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o hyp- obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \ ../fpsimd.o ../hyp-entry.o -obj-y := $(patsubst %.o,%.hyp.o,$(obj-y)) -extra-y := $(patsubst %.hyp.o,%.hyp.tmp.o,$(obj-y)) +## +## Build rules for compiling nVHE hyp code +## Output of this folder is `kvm_nvhe.o`, a partially linked object +## file containing all nVHE hyp code and data. +## -$(obj)/%.hyp.tmp.o: $(src)/%.c FORCE +hyp-obj := $(patsubst %.o,%.nvhe.o,$(obj-y)) +obj-y := kvm_nvhe.o +extra-y := $(hyp-obj) kvm_nvhe.tmp.o hyp.lds + +# 1) Compile all source files to `.nvhe.o` object files. The file extension +# avoids file name clashes for files shared with VHE. +$(obj)/%.nvhe.o: $(src)/%.c FORCE $(call if_changed_rule,cc_o_c) -$(obj)/%.hyp.tmp.o: $(src)/%.S FORCE +$(obj)/%.nvhe.o: $(src)/%.S FORCE $(call if_changed_rule,as_o_S) -$(obj)/%.hyp.o: $(obj)/%.hyp.tmp.o FORCE - $(call if_changed,hypcopy) -# Disable reordering functions by GCC (enabled at -O2). -# This pass puts functions into '.text.*' sections to aid the linker -# in optimizing ELF layout. See HYPCOPY comment below for more info. -ccflags-y += $(call cc-option,-fno-reorder-functions) +# 2) Compile linker script. +$(obj)/hyp.lds: $(src)/hyp.lds.S FORCE + $(call if_changed_dep,cpp_lds_S) + +# 3) Partially link all '.nvhe.o' files and apply the linker script. +# Prefixes names of ELF sections with '.hyp', eg. '.hyp.text'. +# Note: The following rule assumes that the 'ld' rule puts LDFLAGS before +# the list of dependencies to form '-T $(obj)/hyp.lds'. This is to +# keep the dependency on the target while avoiding an error from +# GNU ld if the linker script is passed to it twice. +LDFLAGS_kvm_nvhe.tmp.o := -r -T +$(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE + $(call if_changed,ld) + +# 4) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'. +# Prefixes names of ELF symbols with '__kvm_nvhe_'. +$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.tmp.o FORCE + $(call if_changed,hypcopy) # The HYPCOPY command uses `objcopy` to prefix all ELF symbol names -# and relevant ELF section names to avoid clashes with VHE code/data. -# -# Hyp code is assumed to be in the '.text' section of the input object -# files (with the exception of specialized sections such as -# '.hyp.idmap.text'). This assumption may be broken by a compiler that -# divides code into sections like '.text.unlikely' so as to optimize -# ELF layout. HYPCOPY checks that no such sections exist in the input -# using `objdump`, otherwise they would be linked together with other -# kernel code and not memory-mapped correctly at runtime. +# to avoid clashes with VHE code/data. quiet_cmd_hypcopy = HYPCOPY $@ - cmd_hypcopy = \ - if $(OBJDUMP) -h $< | grep -F '.text.'; then \ - echo "$@: function reordering not supported in nVHE hyp code" >&2; \ - /bin/false; \ - fi; \ - $(OBJCOPY) --prefix-symbols=__kvm_nvhe_ \ - --rename-section=.text=.hyp.text \ - $< $@ + cmd_hypcopy = $(OBJCOPY) --prefix-symbols=__kvm_nvhe_ $< $@ # Remove ftrace and Shadow Call Stack CFLAGS. # This is equivalent to the 'notrace' and '__noscs' annotations. diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S new file mode 100644 index 000000000000..bb2d986ff696 --- /dev/null +++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2020 Google LLC. + * Written by David Brazdil <dbrazdil@google.com> + * + * Linker script used for partial linking of nVHE EL2 object files. + */ + +#include <asm/hyp_image.h> +#include <asm-generic/vmlinux.lds.h> +#include <asm/cache.h> +#include <asm/memory.h> + +SECTIONS { + HYP_SECTION(.text) + HYP_SECTION_NAME(.data..percpu) : { + PERCPU_INPUT(L1_CACHE_BYTES) + } +} diff --git a/arch/arm64/kvm/hyp/nvhe/switch.c b/arch/arm64/kvm/hyp/nvhe/switch.c index a29f247f35e3..a457a0306e03 100644 --- a/arch/arm64/kvm/hyp/nvhe/switch.c +++ b/arch/arm64/kvm/hyp/nvhe/switch.c @@ -27,6 +27,11 @@ #include <asm/processor.h> #include <asm/thread_info.h> +/* Non-VHE specific context */ +DEFINE_PER_CPU(struct kvm_host_data, kvm_host_data); +DEFINE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt); +DEFINE_PER_CPU(unsigned long, kvm_hyp_vector); + static void __activate_traps(struct kvm_vcpu *vcpu) { u64 val; @@ -42,7 +47,7 @@ static void __activate_traps(struct kvm_vcpu *vcpu) } write_sysreg(val, cptr_el2); - write_sysreg(__hyp_this_cpu_read(kvm_hyp_vector), vbar_el2); + write_sysreg(__this_cpu_read(kvm_hyp_vector), vbar_el2); if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) { struct kvm_cpu_context *ctxt = &vcpu->arch.ctxt; @@ -176,7 +181,7 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu) pmr_sync(); } - host_ctxt = &__hyp_this_cpu_ptr(kvm_host_data)->host_ctxt; + host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt; host_ctxt->__hyp_running_vcpu = vcpu; guest_ctxt = &vcpu->arch.ctxt; @@ -203,8 +208,6 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu) __debug_switch_to_guest(vcpu); - __set_guest_arch_workaround_state(vcpu); - do { /* Jump in the fire! */ exit_code = __guest_enter(vcpu); @@ -212,8 +215,6 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu) /* And we're baaack! */ } while (fixup_guest_exit(vcpu, &exit_code)); - __set_host_arch_workaround_state(vcpu); - __sysreg_save_state_nvhe(guest_ctxt); __sysreg32_save_state(vcpu); __timer_disable_traps(vcpu); @@ -254,7 +255,7 @@ void __noreturn hyp_panic(void) struct kvm_cpu_context *host_ctxt; struct kvm_vcpu *vcpu; - host_ctxt = &__hyp_this_cpu_ptr(kvm_host_data)->host_ctxt; + host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt; vcpu = host_ctxt->__hyp_running_vcpu; if (vcpu) { |