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AJvYcCXR4IQ7r6EdD91n5PFNEOx/Z7bsdxHURX360AvsnseK5xcErzTBkIIWd+kXgCP7c9g9Sd8Clz7ESSFVUjc=@vger.kernel.org X-Gm-Message-State: AOJu0Yy3yYRiU9Q/C+p56yP2atbiOxN9qDxRda2ITkBQ2ymIquWDlj07 96m7NuGx8ZgExc58ovCsNONTzPaewcRsjm+J4Xaj3bv+6tDaX4xsVzGigreaOofHgS3UUJmsFPU pdejccmFLxw0lS0tHnLSdzw== X-Google-Smtp-Source: AGHT+IEM7X8A+Hr+6Paat0E8X6JUwIYRBH+lXGFDjpwXPF4BN9qe9YEMSyyUdVnl+6EQi5h0wYtY5MMHF1nWX41O X-Received: from ejcss8.prod.google.com ([2002:a17:907:c008:b0:b6d:76e0:3c6]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a17:907:3e8d:b0:b6d:7f84:633 with SMTP id a640c23a62f3a-b76c53c0c18mr3398928066b.20.1764668219620; Tue, 02 Dec 2025 01:36:59 -0800 (PST) Date: Tue, 2 Dec 2025 09:36:22 +0000 In-Reply-To: <20251202093623.2337860-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251202093623.2337860-1-vdonnefort@google.com> X-Mailer: git-send-email 2.52.0.107.ga0afd4fd5b-goog Message-ID: <20251202093623.2337860-30-vdonnefort@google.com> Subject: [PATCH v9 29/30] KVM: arm64: Add selftest event support to nVHE/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 37c015b54ff6..e2de7ad64938 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -96,6 +96,7 @@ enum __kvm_host_smccc_func { __KVM_HOST_SMCCC_FUNC___tracing_update_clock, __KVM_HOST_SMCCC_FUNC___tracing_reset, __KVM_HOST_SMCCC_FUNC___tracing_enable_event, + __KVM_HOST_SMCCC_FUNC___tracing_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 268b3cd7a1b2..c276fd28e0bf 100644 --- a/arch/arm64/include/asm/kvm_hypevents.h +++ b/arch/arm64/include/asm/kvm_hypevents.h @@ -42,4 +42,15 @@ HYP_EVENT(hyp_exit, ), HE_PRINTK("reason=3D%s", __hyp_enter_exit_reason_str(__entry->reason)) ); + +HYP_EVENT(selftest, + HE_PROTO(u64 id), + HE_STRUCT( + he_field(u64, id) + ), + HE_ASSIGN( + __entry->id =3D id; + ), + RE_PRINTK("id=3D%llu", __entry->id) +); #endif diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/h= yp-main.c index ffda4850022f..13a6c5c4fabd 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c @@ -641,6 +641,15 @@ static void handle___tracing_enable_event(struct kvm_c= pu_context *host_ctxt) cpu_reg(host_ctxt, 1) =3D __tracing_enable_event(id, enable); } =20 +static void handle___tracing_write_event(struct kvm_cpu_context *host_ctxt) +{ + DECLARE_REG(u64, id, host_ctxt, 1); + + trace_selftest(id); + + cpu_reg(host_ctxt, 1) =3D 0; +} + typedef void (*hcall_t)(struct kvm_cpu_context *); =20 #define HANDLE_FUNC(x) [__KVM_HOST_SMCCC_FUNC_##x] =3D (hcall_t)handle_##x @@ -689,6 +698,7 @@ static const hcall_t host_hcall[] =3D { HANDLE_FUNC(__tracing_update_clock), HANDLE_FUNC(__tracing_reset), HANDLE_FUNC(__tracing_enable_event), + HANDLE_FUNC(__tracing_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 1ad6a55ba95c..7b537222f364 100644 --- a/arch/arm64/kvm/hyp_trace.c +++ b/arch/arm64/kvm/hyp_trace.c @@ -348,8 +348,32 @@ static int hyp_trace_clock_show(struct seq_file *m, vo= id *v) } DEFINE_SHOW_ATTRIBUTE(hyp_trace_clock); =20 +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(__tracing_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, +}; + static int hyp_trace_init_tracefs(struct dentry *d, void *priv) { + if (!tracefs_create_file("write_event", 0200, d, NULL, &hyp_trace_write_e= vent_fops)) + return -ENOMEM; + return tracefs_create_file("trace_clock", 0440, d, NULL, &hyp_trace_clock= _fops) ? 0 : -ENOMEM; } --=20 2.52.0.107.ga0afd4fd5b-goog