This patch is part of a series which builds KVM's non-VHE hyp code separately from VHE and the rest of the kernel.
hyp-entry.S contains implementation of KVM hyp vectors. This code is mostly shared between VHE/nVHE, therefore compile it under both VHE and nVHE build rules. nVHE-specific host HVC handler is hidden behind __KVM_NVHE_HYPERVISOR__. Adjust code which selects which KVM hyp vecs to install to choose the correct VHE/nVHE symbol. Signed-off-by: David Brazdil <[email protected]> --- arch/arm64/include/asm/kvm_asm.h | 25 ++++++++++++++++++++++++- 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 | 29 ++++++++++++++++++++++++++++- arch/arm64/kvm/hyp/hyp-entry.S | 2 ++ arch/arm64/kvm/hyp/nvhe/Makefile | 2 +- arch/arm64/kvm/va_layout.c | 2 +- 8 files changed, 69 insertions(+), 18 deletions(-) diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index 7c7eeeaab9fa..01242f54c48f 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -42,6 +42,22 @@ #include <linux/mm.h> +/* + * Translate name of a symbol defined in VHE/nVHE hyp implementations + * to the name seen by kernel proper. All nVHE symbols are prefixed by + * the build system to avoid clashes with the VHE variants. + */ +#define __kvm_vhe_sym(sym) sym +#define __kvm_nvhe_sym(sym) __kvm_nvhe_##sym + +/* + * Define a pair of symbols sharing the same name but one defined in + * VHE and the other in nVHE hyp implementations. + */ +#define DECLARE_KVM_HYP_SYM(sym) \ + extern char __kvm_vhe_sym(sym)[]; \ + extern char __kvm_nvhe_sym(sym)[] + /* Translate a kernel address of @sym into its equivalent linear mapping */ #define kvm_ksym_ref(sym) \ ({ \ @@ -50,6 +66,8 @@ val = lm_alias(&sym); \ val; \ }) +#define kvm_ksym_ref_vhe(sym) kvm_ksym_ref(__kvm_vhe_sym(sym)) +#define kvm_ksym_ref_nvhe(sym) kvm_ksym_ref(__kvm_nvhe_sym(sym)) struct kvm; struct kvm_vcpu; @@ -57,7 +75,12 @@ struct kvm_vcpu; extern char __kvm_hyp_init[]; extern char __kvm_hyp_init_end[]; -extern char __kvm_hyp_vector[]; +DECLARE_KVM_HYP_SYM(__kvm_hyp_vector); + +#ifdef CONFIG_KVM_INDIRECT_VECTORS +DECLARE_KVM_HYP_SYM(__bp_harden_hyp_vecs); +extern atomic_t arm64_el2_vector_last_slot; +#endif extern void __kvm_flush_vm_context(void); extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa); diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h index 30b0e8d6b895..871ef591042c 100644 --- a/arch/arm64/include/asm/kvm_mmu.h +++ b/arch/arm64/include/asm/kvm_mmu.h @@ -477,11 +477,15 @@ extern int __kvm_harden_el2_vector_slot; static inline void *kvm_get_hyp_vector(void) { struct bp_hardening_data *data = arm64_get_bp_hardening_data(); - void *vect = kern_hyp_va(kvm_ksym_ref(__kvm_hyp_vector)); int slot = -1; + void *vect = kern_hyp_va(has_vhe() + ? kvm_ksym_ref_vhe(__kvm_hyp_vector) + : kvm_ksym_ref_nvhe(__kvm_hyp_vector)); if (cpus_have_const_cap(ARM64_HARDEN_BRANCH_PREDICTOR) && data->fn) { - vect = kern_hyp_va(kvm_ksym_ref(__bp_harden_hyp_vecs)); + vect = kern_hyp_va(has_vhe() + ? kvm_ksym_ref_vhe(__bp_harden_hyp_vecs) + : kvm_ksym_ref_nvhe(__bp_harden_hyp_vecs)); slot = data->hyp_vectors_slot; } @@ -510,12 +514,11 @@ static inline int kvm_map_vectors(void) * HBP + HEL2 -> use hardened vertors and use exec mapping */ if (cpus_have_const_cap(ARM64_HARDEN_BRANCH_PREDICTOR)) { - __kvm_bp_vect_base = kvm_ksym_ref(__bp_harden_hyp_vecs); - __kvm_bp_vect_base = kern_hyp_va(__kvm_bp_vect_base); + __kvm_bp_vect_base = kern_hyp_va(kvm_ksym_ref_nvhe(__bp_harden_hyp_vecs)); } if (cpus_have_const_cap(ARM64_HARDEN_EL2_VECTORS)) { - phys_addr_t vect_pa = __pa_symbol(__bp_harden_hyp_vecs); + phys_addr_t vect_pa = __pa_symbol(__kvm_nvhe_sym(__bp_harden_hyp_vecs)); unsigned long size = __BP_HARDEN_HYP_VECS_SZ; /* @@ -534,7 +537,8 @@ static inline int kvm_map_vectors(void) #else static inline void *kvm_get_hyp_vector(void) { - return kern_hyp_va(kvm_ksym_ref(__kvm_hyp_vector)); + return kern_hyp_va(has_vhe() ? kvm_ksym_ref_vhe(__kvm_hyp_vector) + : kvm_ksym_ref_nvhe(__kvm_hyp_vector)); } static inline int kvm_map_vectors(void) diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h index 68140fdd89d6..4d913f6dd366 100644 --- a/arch/arm64/include/asm/mmu.h +++ b/arch/arm64/include/asm/mmu.h @@ -42,13 +42,6 @@ struct bp_hardening_data { bp_hardening_cb_t fn; }; -#if (defined(CONFIG_HARDEN_BRANCH_PREDICTOR) || \ - defined(CONFIG_HARDEN_EL2_VECTORS)) - -extern char __bp_harden_hyp_vecs[]; -extern atomic_t arm64_el2_vector_last_slot; -#endif /* CONFIG_HARDEN_BRANCH_PREDICTOR || CONFIG_HARDEN_EL2_VECTORS */ - #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data); diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index a102321fc8a2..94af3af12f44 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -117,7 +117,9 @@ DEFINE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data); static void __copy_hyp_vect_bpi(int slot, const char *hyp_vecs_start, const char *hyp_vecs_end) { - void *dst = lm_alias(__bp_harden_hyp_vecs + slot * SZ_2K); + char *vec = has_vhe() ? __kvm_vhe_sym(__bp_harden_hyp_vecs) + : __kvm_nvhe_sym(__bp_harden_hyp_vecs); + void *dst = lm_alias(vec + slot * SZ_2K); int i; for (i = 0; i < SZ_2K; i += 0x80) diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h index 13850134fc28..dc9c14d91d39 100644 --- a/arch/arm64/kernel/image-vars.h +++ b/arch/arm64/kernel/image-vars.h @@ -54,13 +54,40 @@ __efistub__ctype = _ctype; #ifdef CONFIG_KVM /* - * KVM nVHE code has its own symbol namespace prefixed by __hyp_text_, to + * KVM nVHE code has its own symbol namespace prefixed by __kvm_nvhe_, to * isolate it from the kernel proper. The following symbols are legally * accessed by it, therefore provide aliases to make them linkable. * Do not include symbols which may not be safely accessed under hypervisor * memory mappings. */ +__kvm_nvhe___guest_exit = __guest_exit; +__kvm_nvhe___kvm_enable_ssbs = __kvm_enable_ssbs; +__kvm_nvhe___kvm_flush_vm_context = __kvm_flush_vm_context; +__kvm_nvhe___kvm_get_mdcr_el2 = __kvm_get_mdcr_el2; +__kvm_nvhe___kvm_handle_stub_hvc = __kvm_handle_stub_hvc; +__kvm_nvhe___kvm_timer_set_cntvoff = __kvm_timer_set_cntvoff; +__kvm_nvhe___kvm_tlb_flush_local_vmid = __kvm_tlb_flush_local_vmid; +__kvm_nvhe___kvm_tlb_flush_vmid = __kvm_tlb_flush_vmid; +__kvm_nvhe___kvm_tlb_flush_vmid_ipa = __kvm_tlb_flush_vmid_ipa; +__kvm_nvhe___kvm_vcpu_run_nvhe = __kvm_vcpu_run_nvhe; +__kvm_nvhe___vgic_v3_get_ich_vtr_el2 = __vgic_v3_get_ich_vtr_el2; +__kvm_nvhe___vgic_v3_init_lrs = __vgic_v3_init_lrs; +__kvm_nvhe___vgic_v3_read_vmcr = __vgic_v3_read_vmcr; +__kvm_nvhe___vgic_v3_restore_aprs = __vgic_v3_restore_aprs; +__kvm_nvhe___vgic_v3_save_aprs = __vgic_v3_save_aprs; +__kvm_nvhe___vgic_v3_write_vmcr = __vgic_v3_write_vmcr; +__kvm_nvhe_abort_guest_exit_end = abort_guest_exit_end; +__kvm_nvhe_abort_guest_exit_start = abort_guest_exit_start; +__kvm_nvhe_arm64_enable_wa2_handling = arm64_enable_wa2_handling; +__kvm_nvhe_arm64_ssbd_callback_required = arm64_ssbd_callback_required; +__kvm_nvhe_hyp_panic = hyp_panic; +__kvm_nvhe_kimage_voffset = kimage_voffset; +__kvm_nvhe_kvm_host_data = kvm_host_data; +__kvm_nvhe_kvm_patch_vector_branch = kvm_patch_vector_branch; +__kvm_nvhe_kvm_update_va_mask = kvm_update_va_mask; +__kvm_nvhe_panic = panic; + #endif /* CONFIG_KVM */ #endif /* __ARM64_KERNEL_IMAGE_VARS_H */ diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S index ab14de8d0131..81c65fa65183 100644 --- a/arch/arm64/kvm/hyp/hyp-entry.S +++ b/arch/arm64/kvm/hyp/hyp-entry.S @@ -27,6 +27,7 @@ el1_sync: // Guest trapped into EL2 ccmp x0, #ESR_ELx_EC_HVC32, #4, ne b.ne el1_trap +#ifdef __KVM_NVHE_HYPERVISOR__ mrs x1, vttbr_el2 // If vttbr is valid, the guest cbnz x1, el1_hvc_guest // called HVC @@ -86,6 +87,7 @@ el1_host_invalid_hvc: mov x0, -ENOSYS eret sb +#endif /* __KVM_NVHE_HYPERVISOR__ */ el1_hvc_guest: /* diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile index 7d64235dba62..c68801e24950 100644 --- a/arch/arm64/kvm/hyp/nvhe/Makefile +++ b/arch/arm64/kvm/hyp/nvhe/Makefile @@ -7,7 +7,7 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__ ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -fno-stack-protector \ -DDISABLE_BRANCH_PROFILING $(DISABLE_STACKLEAK_PLUGIN) -obj-y := +obj-y := ../hyp-entry.o obj-y := $(patsubst %.o,%.hyp.o,$(obj-y)) extra-y := $(patsubst %.hyp.o,%.hyp.tmp.o,$(obj-y)) diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c index a4f48c1ac28c..157d106235f7 100644 --- a/arch/arm64/kvm/va_layout.c +++ b/arch/arm64/kvm/va_layout.c @@ -150,7 +150,7 @@ void kvm_patch_vector_branch(struct alt_instr *alt, /* * Compute HYP VA by using the same computation as kern_hyp_va() */ - addr = (uintptr_t)kvm_ksym_ref(__kvm_hyp_vector); + addr = (uintptr_t)kvm_ksym_ref_nvhe(__kvm_hyp_vector); addr &= va_mask; addr |= tag_val << tag_lsb; -- 2.26.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
