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AJvYcCXJXkJHS4FejEZMgzVmXNGyuZfRO4GbF/PW0IiCcrYIW9/fAwjFfB1qhigVWllwHT3CAgXsuYviGnc999E=@vger.kernel.org X-Gm-Message-State: AOJu0Yw/CT+ab0se+K+8iU4pYy7snXkRkmVrsJyj91NQzqqhaMB2y5Ot pNV8ju38dat3V/dIwpobUsHe2R+3WundvzhAGXa9Xm0ZeP3GNJR+35KvxZ4DICL/3jI+8sWLq8k 8qsj0XLbOFTyHwllklFb6Qw== X-Google-Smtp-Source: AGHT+IHmNTKIfmJBSV1zkhye9J1bZMXznN6MdE2ykHFf8Q6WXhD9/5vx9kVWIQamab59N40QbsoOW07BLrHumaQu X-Received: from wmbz19.prod.google.com ([2002:a05:600c:c093:b0:475:d8ac:bbb0]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:1d0b:b0:477:cb6:805e with SMTP id 5b1f17b1804b1-4776bcac819mr17070115e9.18.1762508351802; Fri, 07 Nov 2025 01:39:11 -0800 (PST) Date: Fri, 7 Nov 2025 09:38:37 +0000 In-Reply-To: <20251107093840.3779150-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251107093840.3779150-1-vdonnefort@google.com> X-Mailer: git-send-email 2.51.2.1041.gc1ab5b90ca-goog Message-ID: <20251107093840.3779150-26-vdonnefort@google.com> Subject: [PATCH v8 25/28] KVM: arm64: Add event support to the pKVM hyp and trace remote From: Vincent Donnefort To: rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com Cc: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, jstultz@google.com, qperret@google.com, will@kernel.org, aneesh.kumar@kernel.org, kernel-team@android.com, linux-kernel@vger.kernel.org, Vincent Donnefort Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Allow the creation of hypervisor and trace remote events with a single macro HYP_EVENT(). That macro expands in the kernel side to add all the required declarations (based on REMOTE_EVENT()) as well as in the hypervisor side to create the trace_() function. Signed-off-by: Vincent Donnefort diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_= asm.h index 4faabf398881..f7b29eae7010 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -95,6 +95,7 @@ enum __kvm_host_smccc_func { __KVM_HOST_SMCCC_FUNC___pkvm_enable_tracing, __KVM_HOST_SMCCC_FUNC___pkvm_reset_tracing, __KVM_HOST_SMCCC_FUNC___pkvm_swap_reader_tracing, + __KVM_HOST_SMCCC_FUNC___pkvm_enable_event, }; =20 #define DECLARE_KVM_VHE_SYM(sym) extern char sym[] diff --git a/arch/arm64/include/asm/kvm_define_hypevents.h b/arch/arm64/inc= lude/asm/kvm_define_hypevents.h new file mode 100644 index 000000000000..0ef5a9eefcbe --- /dev/null +++ b/arch/arm64/include/asm/kvm_define_hypevents.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef HYP_EVENT_FILE +# undef __ARM64_KVM_HYPEVENTS_H_ +# define REMOTE_EVENT_INCLUDE_FILE arch/arm64/include/asm/kvm_hypevents.h +#else +# define REMOTE_EVENT_INCLUDE_FILE HYP_EVENT_FILE +#endif + +#define REMOTE_EVENT_SECTION "_hyp_events" + +#define HE_STRUCT(__args) __args +#define HE_PRINTK(__args...) __args +#define he_field re_field + +#define HYP_EVENT(__name, __proto, __struct, __assign, __printk) \ + REMOTE_EVENT(__name, 0, RE_STRUCT(__struct), RE_PRINTK(__printk)) + +#define HYP_EVENT_MULTI_READ + +#include diff --git a/arch/arm64/include/asm/kvm_hypevents.h b/arch/arm64/include/as= m/kvm_hypevents.h new file mode 100644 index 000000000000..d6e033c96c52 --- /dev/null +++ b/arch/arm64/include/asm/kvm_hypevents.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#if !defined(__ARM64_KVM_HYPEVENTS_H_) || defined(HYP_EVENT_MULTI_READ) +#define __ARM64_KVM_HYPEVENTS_H_ + +#ifdef __KVM_NVHE_HYPERVISOR__ +#include +#endif + +#endif diff --git a/arch/arm64/include/asm/kvm_hyptrace.h b/arch/arm64/include/asm= /kvm_hyptrace.h index 9c30a479bc36..d6e0953a07d6 100644 --- a/arch/arm64/include/asm/kvm_hyptrace.h +++ b/arch/arm64/include/asm/kvm_hyptrace.h @@ -10,4 +10,17 @@ struct hyp_trace_desc { struct trace_buffer_desc trace_buffer_desc; =20 }; + +struct hyp_event_id { + unsigned short id; + void *data; +}; + +extern struct remote_event __hyp_events_start[]; +extern struct remote_event __hyp_events_end[]; + +/* hyp_event section used by the hypervisor */ +extern struct hyp_event_id __hyp_event_ids_start[]; +extern struct hyp_event_id __hyp_event_ids_end[]; + #endif diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h index 5369763606e7..c0efa9aa541b 100644 --- a/arch/arm64/kernel/image-vars.h +++ b/arch/arm64/kernel/image-vars.h @@ -137,6 +137,10 @@ KVM_NVHE_ALIAS(__hyp_data_start); KVM_NVHE_ALIAS(__hyp_data_end); KVM_NVHE_ALIAS(__hyp_rodata_start); KVM_NVHE_ALIAS(__hyp_rodata_end); +#ifdef CONFIG_PKVM_TRACING +KVM_NVHE_ALIAS(__hyp_event_ids_start); +KVM_NVHE_ALIAS(__hyp_event_ids_end); +#endif =20 /* pKVM static key */ KVM_NVHE_ALIAS(kvm_protected_mode_initialized); diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.ld= s.S index ad6133b89e7a..0e201a3c8de5 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S @@ -13,12 +13,23 @@ *(__kvm_ex_table) \ __stop___kvm_ex_table =3D .; =20 +#ifdef CONFIG_PKVM_TRACING +#define HYPERVISOR_EVENT_IDS \ + . =3D ALIGN(PAGE_SIZE); \ + __hyp_event_ids_start =3D .; \ + *(HYP_SECTION_NAME(.event_ids)) \ + __hyp_event_ids_end =3D .; +#else +#define HYPERVISOR_EVENT_IDS +#endif + #define HYPERVISOR_RODATA_SECTIONS \ HYP_SECTION_NAME(.rodata) : { \ . =3D ALIGN(PAGE_SIZE); \ __hyp_rodata_start =3D .; \ *(HYP_SECTION_NAME(.data..ro_after_init)) \ *(HYP_SECTION_NAME(.rodata)) \ + HYPERVISOR_EVENT_IDS \ . =3D ALIGN(PAGE_SIZE); \ __hyp_rodata_end =3D .; \ } @@ -307,6 +318,13 @@ SECTIONS =20 HYPERVISOR_DATA_SECTION =20 +#ifdef CONFIG_PKVM_TRACING + .data.hyp_events : { + __hyp_events_start =3D .; + *(SORT(_hyp_events.*)) + __hyp_events_end =3D .; + } +#endif /* * Data written with the MMU off but read with the MMU on requires * cache lines to be invalidated, discarding up to a Cache Writeback diff --git a/arch/arm64/kvm/hyp/include/nvhe/define_events.h b/arch/arm64/k= vm/hyp/include/nvhe/define_events.h new file mode 100644 index 000000000000..2298b49cb355 --- /dev/null +++ b/arch/arm64/kvm/hyp/include/nvhe/define_events.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef HYP_EVENT_FILE +# define __HYP_EVENT_FILE +#else +# define __HYP_EVENT_FILE __stringify(HYP_EVENT_FILE) +#endif + +#undef HYP_EVENT +#define HYP_EVENT(__name, __proto, __struct, __assign, __printk) \ + atomic_t __ro_after_init __name##_enabled =3D ATOMIC_INIT(0); \ + struct hyp_event_id hyp_event_id_##__name \ + __section(".hyp.event_ids."#__name) =3D { \ + .data =3D (void *)&__name##_enabled, \ + } + +#define HYP_EVENT_MULTI_READ +#include __HYP_EVENT_FILE +#undef HYP_EVENT_MULTI_READ + +#undef HYP_EVENT diff --git a/arch/arm64/kvm/hyp/include/nvhe/trace.h b/arch/arm64/kvm/hyp/i= nclude/nvhe/trace.h index 0d2732f0d406..f7b286e92853 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/trace.h +++ b/arch/arm64/kvm/hyp/include/nvhe/trace.h @@ -1,21 +1,52 @@ /* SPDX-License-Identifier: GPL-2.0-only */ #ifndef __ARM64_KVM_HYP_NVHE_TRACE_H #define __ARM64_KVM_HYP_NVHE_TRACE_H + +#include + #include =20 +#define HE_PROTO(__args...) __args + #ifdef CONFIG_PKVM_TRACING void *tracing_reserve_entry(unsigned long length); void tracing_commit_entry(void); =20 +#define HE_ASSIGN(__args...) __args +#define HE_STRUCT RE_STRUCT +#define he_field re_field + +#define HYP_EVENT(__name, __proto, __struct, __assign, __printk) \ + REMOTE_EVENT_FORMAT(__name, __struct); \ + extern atomic_t __name##_enabled; \ + extern struct hyp_event_id hyp_event_id_##__name; \ + static __always_inline void trace_##__name(__proto) \ + { \ + struct remote_event_format_##__name *__entry; \ + size_t length =3D sizeof(*__entry); \ + \ + if (!atomic_read(&__name##_enabled)) \ + return; \ + __entry =3D tracing_reserve_entry(length); \ + if (!__entry) \ + return; \ + __entry->hdr.id =3D hyp_event_id_##__name.id; \ + __assign \ + tracing_commit_entry(); \ + } + void __pkvm_update_clock_tracing(u32 mult, u32 shift, u64 epoch_ns, u64 ep= och_cyc); int __pkvm_load_tracing(unsigned long desc_va, size_t desc_size); void __pkvm_unload_tracing(void); int __pkvm_enable_tracing(bool enable); int __pkvm_reset_tracing(unsigned int cpu); int __pkvm_swap_reader_tracing(unsigned int cpu); +int __pkvm_enable_event(unsigned short id, bool enable); #else static inline void *tracing_reserve_entry(unsigned long length) { return N= ULL; } static inline void tracing_commit_entry(void) { } +#define HYP_EVENT(__name, __proto, __struct, __assign, __printk) \ + static inline void trace_##__name(__proto) {} =20 static inline void __pkvm_update_clock_tracing(u32 mult, u32 shift, u64 epoch_ns, u64 ep= och_cyc) { } @@ -24,5 +55,6 @@ static inline void __pkvm_unload_tracing(void) { } static inline int __pkvm_enable_tracing(bool enable) { return -ENODEV; } static inline int __pkvm_reset_tracing(unsigned int cpu) { return -ENODEV;= } static inline int __pkvm_swap_reader_tracing(unsigned int cpu) { return -E= NODEV; } +static inline int __pkvm_enable_event(unsigned short id, bool enable) { r= eturn -ENODEV; } #endif #endif diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Mak= efile index 504c3b9caef8..b77959e963f3 100644 --- a/arch/arm64/kvm/hyp/nvhe/Makefile +++ b/arch/arm64/kvm/hyp/nvhe/Makefile @@ -29,7 +29,7 @@ hyp-obj-y +=3D ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cp= uif-proxy.o ../entry.o \ ../fpsimd.o ../hyp-entry.o ../exception.o ../pgtable.o hyp-obj-y +=3D ../../../kernel/smccc-call.o hyp-obj-$(CONFIG_LIST_HARDENED) +=3D list_debug.o -hyp-obj-$(CONFIG_PKVM_TRACING) +=3D clock.o trace.o ../../../../../kernel/= trace/simple_ring_buffer.o +hyp-obj-$(CONFIG_PKVM_TRACING) +=3D clock.o trace.o ../../../../../kernel/= trace/simple_ring_buffer.o events.o hyp-obj-y +=3D $(lib-objs) =20 ## diff --git a/arch/arm64/kvm/hyp/nvhe/events.c b/arch/arm64/kvm/hyp/nvhe/eve= nts.c new file mode 100644 index 000000000000..5905b42cb0d0 --- /dev/null +++ b/arch/arm64/kvm/hyp/nvhe/events.c @@ -0,0 +1,36 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2025 Google LLC + * Author: Vincent Donnefort + */ + +#include +#include + +#include + +extern struct hyp_event_id __hyp_event_ids_start[]; +extern struct hyp_event_id __hyp_event_ids_end[]; + +int __pkvm_enable_event(unsigned short id, bool enable) +{ + struct hyp_event_id *event_id =3D __hyp_event_ids_start; + atomic_t *enable_key; + + for (; (unsigned long)event_id < (unsigned long)__hyp_event_ids_end; + event_id++) { + if (event_id->id !=3D id) + continue; + + enable_key =3D (atomic_t *)event_id->data; + enable_key =3D hyp_fixmap_map(__hyp_pa(enable_key)); + + atomic_set(enable_key, enable); + + hyp_fixmap_unmap(); + + return 0; + } + + return -EINVAL; +} diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/h= yp-main.c index 8adad701fc76..5e4b519e5204 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c @@ -634,6 +634,14 @@ static void handle___pkvm_swap_reader_tracing(struct k= vm_cpu_context *host_ctxt) cpu_reg(host_ctxt, 1) =3D __pkvm_swap_reader_tracing(cpu); } =20 +static void handle___pkvm_enable_event(struct kvm_cpu_context *host_ctxt) +{ + DECLARE_REG(unsigned short, id, host_ctxt, 1); + DECLARE_REG(bool, enable, host_ctxt, 2); + + cpu_reg(host_ctxt, 1) =3D __pkvm_enable_event(id, enable); +} + typedef void (*hcall_t)(struct kvm_cpu_context *); =20 #define HANDLE_FUNC(x) [__KVM_HOST_SMCCC_FUNC_##x] =3D (hcall_t)handle_##x @@ -681,6 +689,7 @@ static const hcall_t host_hcall[] =3D { HANDLE_FUNC(__pkvm_enable_tracing), HANDLE_FUNC(__pkvm_reset_tracing), HANDLE_FUNC(__pkvm_swap_reader_tracing), + HANDLE_FUNC(__pkvm_enable_event), }; =20 static void handle_host_hcall(struct kvm_cpu_context *host_ctxt) diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hy= p.lds.S index d724f6d69302..a68411bf4bef 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S +++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S @@ -16,6 +16,12 @@ SECTIONS { HYP_SECTION(.text) HYP_SECTION(.data..ro_after_init) HYP_SECTION(.rodata) +#ifdef CONFIG_PKVM_TRACING + . =3D ALIGN(PAGE_SIZE); + BEGIN_HYP_SECTION(.event_ids) + *(SORT(.hyp.event_ids.*)) + END_HYP_SECTION +#endif =20 /* * .hyp..data..percpu needs to be page aligned to maintain the same diff --git a/arch/arm64/kvm/hyp_trace.c b/arch/arm64/kvm/hyp_trace.c index 1062b4310f8c..73539f5b5e42 100644 --- a/arch/arm64/kvm/hyp_trace.c +++ b/arch/arm64/kvm/hyp_trace.c @@ -307,7 +307,7 @@ static int hyp_trace_reset(unsigned int cpu, void *priv) =20 static int hyp_trace_enable_event(unsigned short id, bool enable, void *pr= iv) { - return 0; + return kvm_call_hyp_nvhe(__pkvm_enable_event, id, enable); } =20 static int hyp_trace_clock_show(struct seq_file *m, void *v) @@ -334,10 +334,27 @@ static struct trace_remote_callbacks trace_remote_cal= lbacks =3D { .enable_event =3D hyp_trace_enable_event, }; =20 +#include + +static void hyp_trace_init_events(void) +{ + struct hyp_event_id *hyp_event_id =3D __hyp_event_ids_start; + struct remote_event *event =3D __hyp_events_start; + int id =3D 0; + + /* Events on both sides hypervisor are sorted */ + for (; (unsigned long)event < (unsigned long)__hyp_events_end; + event++, hyp_event_id++, id++) + event->id =3D hyp_event_id->id =3D id; +} + int hyp_trace_init(void) { if (!is_protected_kvm_enabled()) return 0; =20 - return trace_remote_register("hypervisor", &trace_remote_callbacks, &trac= e_buffer, NULL, 0); + hyp_trace_init_events(); + + return trace_remote_register("hypervisor", &trace_remote_callbacks, &trac= e_buffer, + __hyp_events_start, __hyp_events_end - __hyp_events_start); } diff --git a/kernel/trace/trace_remote.c b/kernel/trace/trace_remote.c index 4f2b67d1bfec..e54cc3e75dc5 100644 --- a/kernel/trace/trace_remote.c +++ b/kernel/trace/trace_remote.c @@ -1040,7 +1040,7 @@ static int remote_event_format_show(struct seq_file *= s, void *unused) while (field->name) { seq_printf(s, "\tfield:%s %s;\toffset:%zu;\tsize:%u;\tsigned:%d;\n", field->type, field->name, offset, field->size, - !field->is_signed); + field->is_signed); offset +=3D field->size; field++; } @@ -1071,7 +1071,7 @@ static int remote_event_callback(const char *name, um= ode_t *mode, void **data, =20 if (!strcmp(name, "format")) { *mode =3D TRACEFS_MODE_READ; - *fops =3D &remote_event_id_fops; + *fops =3D &remote_event_format_fops; return 1; } =20 --=20 2.51.2.1041.gc1ab5b90ca-goog