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AJvYcCVM/q86G+kYwr6FhifCrWqbKcRgLThE8m0uXLd8q3oexHqgR4NsJ8cPeOTZy7R0DILkNV0Qm37/LDg+KqA=@vger.kernel.org X-Gm-Message-State: AOJu0Yxcwgr44L0OVlRORciJLAR/8L7GVECLEARP0TOJPIdBB524ZGtr hW0wgTZ5p45+6qlaTNlzFHaufB3QPa8k6/pAVD+vVaBvONC2w5tAuNl3hk0M7/nxW4TAIKLOVfx broAvl9BqhDZvNJOZyMdfNQ== X-Google-Smtp-Source: AGHT+IFBwm4nsjQFbZ2TuWuaXuLzNFlXoEJJyhjLRg44n+oKsrUh+xl35jfaVRxhiG9z7P8qTxgzFlBgbH+883qw X-Received: from wmbes8.prod.google.com ([2002:a05:600c:8108:b0:459:da33:b20c]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:3b84:b0:456:1904:27f3 with SMTP id 5b1f17b1804b1-45b4d85b22amr11092705e9.18.1755764094894; Thu, 21 Aug 2025 01:14:54 -0700 (PDT) Date: Thu, 21 Aug 2025 09:14:11 +0100 In-Reply-To: <20250821081412.1008261-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250821081412.1008261-1-vdonnefort@google.com> X-Mailer: git-send-email 2.51.0.rc2.233.g662b1ed5c5-goog Message-ID: <20250821081412.1008261-24-vdonnefort@google.com> Subject: [PATCH v6 23/24] KVM: arm64: Add selftest event support to pKVM hyp 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" Add a selftest event that can be triggered from a `write_event` tracefs file. This intends to be used by trace remote selftests. Signed-off-by: Vincent Donnefort diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_= asm.h index 79019e11f529..522cccef32b7 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -94,6 +94,7 @@ enum __kvm_host_smccc_func { __KVM_HOST_SMCCC_FUNC___pkvm_reset_tracing, __KVM_HOST_SMCCC_FUNC___pkvm_swap_reader_tracing, __KVM_HOST_SMCCC_FUNC___pkvm_enable_event, + __KVM_HOST_SMCCC_FUNC___pkvm_write_event, }; =20 #define DECLARE_KVM_VHE_SYM(sym) extern char sym[] diff --git a/arch/arm64/include/asm/kvm_hypevents.h b/arch/arm64/include/as= m/kvm_hypevents.h index ce3953bc884a..3d1244972869 100644 --- a/arch/arm64/include/asm/kvm_hypevents.h +++ b/arch/arm64/include/asm/kvm_hypevents.h @@ -24,4 +24,18 @@ HYP_EVENT(hyp_exit, ), HE_PRINTK() ); + +#ifdef CONFIG_PKVM_SELFTESTS +HYP_EVENT(selftest, + HE_PROTO(u64 id), + HE_STRUCT( + he_field(u64, id) + ), + HE_ASSIGN( + __entry->id =3D id; + ), + RE_PRINTK("id=3D%lld", __entry->id) +); #endif + +#endif /* __ARM64_KVM_HYPEVENTS_H_ */ diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index e06358aaf1af..dc2ac3049428 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -45,6 +45,7 @@ menuconfig KVM config NVHE_EL2_DEBUG bool "Debug mode for non-VHE EL2 object" depends on KVM + select PKVM_SELFTESTS help Say Y here to enable the debug mode for the non-VHE KVM EL2 object. Failure reports will BUG() in the hypervisor. This is intended for @@ -82,6 +83,15 @@ config PTDUMP_STAGE2_DEBUGFS =20 If in doubt, say N. =20 +config PKVM_SELFTESTS + bool "Protected KVM hypervisor selftests" + depends on KVM + default n + help + Say Y here to enable pKVM hypervisor testing infrastructure. + + If unsure, say N. + config PKVM_TRACING bool depends on KVM diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/h= yp-main.c index f8361520967b..81d8628a9047 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c @@ -631,6 +631,20 @@ static void handle___pkvm_enable_event(struct kvm_cpu_= context *host_ctxt) cpu_reg(host_ctxt, 1) =3D __pkvm_enable_event(id, enable); } =20 +static void handle___pkvm_write_event(struct kvm_cpu_context *host_ctxt) +{ + int smc_ret =3D SMCCC_RET_NOT_SUPPORTED, ret =3D -EOPNOTSUPP; +#ifdef CONFIG_PKVM_SELFTESTS + DECLARE_REG(u64, id, host_ctxt, 1); + + trace_selftest(id); + smc_ret =3D SMCCC_RET_SUCCESS; + ret =3D 0; +#endif + cpu_reg(host_ctxt, 0) =3D smc_ret; + cpu_reg(host_ctxt, 1) =3D ret; +} + typedef void (*hcall_t)(struct kvm_cpu_context *); =20 #define HANDLE_FUNC(x) [__KVM_HOST_SMCCC_FUNC_##x] =3D (hcall_t)handle_##x @@ -677,6 +691,7 @@ static const hcall_t host_hcall[] =3D { HANDLE_FUNC(__pkvm_reset_tracing), HANDLE_FUNC(__pkvm_swap_reader_tracing), HANDLE_FUNC(__pkvm_enable_event), + HANDLE_FUNC(__pkvm_write_event), }; =20 static void handle_host_hcall(struct kvm_cpu_context *host_ctxt) diff --git a/arch/arm64/kvm/hyp_trace.c b/arch/arm64/kvm/hyp_trace.c index 70c0939ebc6a..5b5d17a47ecc 100644 --- a/arch/arm64/kvm/hyp_trace.c +++ b/arch/arm64/kvm/hyp_trace.c @@ -317,8 +317,34 @@ static int hyp_trace_clock_show(struct seq_file *m, vo= id *v) } DEFINE_SHOW_ATTRIBUTE(hyp_trace_clock); =20 +#ifdef CONFIG_PKVM_SELFTESTS +static ssize_t hyp_trace_write_event_write(struct file *f, const char __us= er *ubuf, + size_t cnt, loff_t *pos) +{ + unsigned long val; + int ret; + + ret =3D kstrtoul_from_user(ubuf, cnt, 10, &val); + if (ret) + return ret; + + ret =3D kvm_call_hyp_nvhe(__pkvm_write_event, val); + if (ret) + return ret; + + return cnt; +} + +static const struct file_operations hyp_trace_write_event_fops =3D { + .write =3D hyp_trace_write_event_write, +}; +#endif + static int hyp_trace_init_tracefs(struct dentry *d, void *priv) { +#ifdef CONFIG_PKVM_SELFTESTS + tracefs_create_file("write_event", 0200, d, NULL, &hyp_trace_write_event_= fops); +#endif return tracefs_create_file("trace_clock", 0440, d, NULL, &hyp_trace_clock= _fops) ? 0 : -ENOMEM; } --=20 2.51.0.rc2.233.g662b1ed5c5-goog