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Fri, 09 Oct 2026 01:45:49 -0700 (PDT) Date: Fri, 9 Oct 2026 09:45:29 +0100 In-Reply-To: <20261009084529.462577-1-vdonnefort@google.com> Mime-Version: 1.0 References: <20261009084529.462577-1-vdonnefort@google.com> X-Mailer: git-send-email 2.56.0.385.gd3acb90ef8-goog Message-ID: <20261009084529.462577-4-vdonnefort@google.com> Subject: [PATCH v1 3/3] KVM: arm64: Add host_hvc hyp event From: Vincent Donnefort To: maz@kernel.org, oupton@kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org Cc: joey.gouly@arm.com, seiden@linux.ibm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, kernel-team@android.com, fuad.tabba@linux.dev, qperret@google.com, Vincent Donnefort Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261009_094552_792589_E7B8C897 X-CRM114-Status: GOOD ( 11.29 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add a host_hvc hypervisor trace event to log host HVC call IDs and return values. Signed-off-by: Vincent Donnefort --- arch/arm64/include/asm/kvm_hypevents.h | 13 +++++++++++++ arch/arm64/kvm/hyp/nvhe/hyp-main.c | 2 ++ 2 files changed, 15 insertions(+) diff --git a/arch/arm64/include/asm/kvm_hypevents.h b/arch/arm64/include/asm/kvm_hypevents.h index c1239d78c8f9..a37ba9db1cc7 100644 --- a/arch/arm64/include/asm/kvm_hypevents.h +++ b/arch/arm64/include/asm/kvm_hypevents.h @@ -60,6 +60,19 @@ HYP_EVENT(selftest, RE_PRINTK("id=%llu", __entry->id) ); +HYP_EVENT(host_hvc, + HE_PROTO(u8 id, u64 ret), + HE_STRUCT( + he_field(u8, id) + he_field(u64, ret) + ), + HE_ASSIGN( + __entry->id = id; + __entry->ret = ret; + ), + HE_PRINTK("id=%u ret=0x%llx", __entry->id, __entry->ret) +); + HYP_EVENT(guest_hvc, HE_PROTO(u32 id, u64 val, u8 handled), HE_STRUCT( diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c index 76d08c503dc0..579615e3b2dd 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c @@ -996,6 +996,8 @@ static void handle_host_hcall(struct kvm_cpu_context *host_ctxt) cpu_reg(host_ctxt, 0) = SMCCC_RET_SUCCESS; hfn(host_ctxt); + trace_host_hvc(id, cpu_reg(host_ctxt, 1)); + return; inval: cpu_reg(host_ctxt, 0) = SMCCC_RET_NOT_SUPPORTED; -- 2.56.0.385.gd3acb90ef8-goog