{"id":2220435,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2220435/?format=json","web_url":"http://patchwork.ozlabs.org/project/kvm-riscv/patch/20260407171455735miXfwO3C51btdouaaGUEc@zte.com.cn/","project":{"id":70,"url":"http://patchwork.ozlabs.org/api/1.1/projects/70/?format=json","name":"Linux KVM RISC-V","link_name":"kvm-riscv","list_id":"kvm-riscv.lists.infradead.org","list_email":"kvm-riscv@lists.infradead.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260407171455735miXfwO3C51btdouaaGUEc@zte.com.cn>","date":"2026-04-07T09:14:55","name":"[2/3] RISC-V: KVM: add tracepoints for guest page faults","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"d7a72c7b7281029d18bc534c9fb65a229e3e870c","submitter":{"id":91800,"url":"http://patchwork.ozlabs.org/api/1.1/people/91800/?format=json","name":"","email":"wang.yechao255@zte.com.cn"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/kvm-riscv/patch/20260407171455735miXfwO3C51btdouaaGUEc@zte.com.cn/mbox/","series":[{"id":498947,"url":"http://patchwork.ozlabs.org/api/1.1/series/498947/?format=json","web_url":"http://patchwork.ozlabs.org/project/kvm-riscv/list/?series=498947","date":"2026-04-07T09:10:52","name":"RISC-V: KVM: Huge page recovery during disable-dirty-log","version":1,"mbox":"http://patchwork.ozlabs.org/series/498947/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2220435/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2220435/checks/","tags":{},"headers":{"Return-Path":"\n ","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=eHy/Oa7b;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=none (no SPF record) smtp.mailfrom=lists.infradead.org\n (client-ip=2607:7c80:54:3::133; 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The original\n message has been attached to this so you can view it or label\n similar future email. If you have any questions, see\n the administrator of that system for details.\n Content preview: From: Wang Yechao Add the\n kvm_page_fault\n event tracepoints to count the number of KVM guest page faults.\n Signed-off-by:\n Wang Yechao --- arch/riscv/kvm/trace.h | 25\n +++++++++++++++++++++++++\n arch/riscv/kvm/vcpu_exit.c | 3 +++ 2 files changed, 28 insertions(+)\n Content analysis details: (-1.9 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n -0.0 SPF_PASS SPF: sender matches SPF record\n 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record\n -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]\n 0.0 RCVD_IN_VALIDITY_CERTIFIED_BLOCKED RBL: ADMINISTRATOR NOTICE: The\n query to Validity was blocked. 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See\n https://knowledge.validity.com/hc/en-us/articles/20961730681243\n for more information.\n [160.30.148.35 listed in\n bl.score.senderscore.com]\n 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders","X-BeenThere":"kvm-riscv@lists.infradead.org","X-Mailman-Version":"2.1.34","Precedence":"list","List-Id":"","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Content-Type":"text/plain; charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Sender":"\"kvm-riscv\" ","Errors-To":"kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org"},"content":"From: Wang Yechao \n\nAdd the kvm_page_fault event tracepoints to count the number of KVM\nguest page faults.\n\nSigned-off-by: Wang Yechao \n---\n arch/riscv/kvm/trace.h | 25 +++++++++++++++++++++++++\n arch/riscv/kvm/vcpu_exit.c | 3 +++\n 2 files changed, 28 insertions(+)","diff":"diff --git a/arch/riscv/kvm/trace.h b/arch/riscv/kvm/trace.h\nindex 3d54175d805c..9056cc9883cf 100644\n--- a/arch/riscv/kvm/trace.h\n+++ b/arch/riscv/kvm/trace.h\n@@ -56,6 +56,31 @@ TRACE_EVENT(kvm_exit,\n \t\t__entry->htinst)\n );\n\n+/*\n+ * Tracepoint for page fault.\n+ */\n+TRACE_EVENT(kvm_page_fault,\n+\tTP_PROTO(struct kvm_vcpu *vcpu, u64 fault_address, u64 error_code),\n+\tTP_ARGS(vcpu, fault_address, error_code),\n+\n+\tTP_STRUCT__entry(\n+\t\t__field(unsigned int, vcpu_id)\n+\t\t__field(u64, fault_address)\n+\t\t__field(u64, error_code)\n+\t),\n+\n+\tTP_fast_assign(\n+\t\t__entry->vcpu_id = vcpu->vcpu_id;\n+\t\t__entry->fault_address = fault_address;\n+\t\t__entry->error_code = error_code;\n+\t),\n+\n+\tTP_printk(\"vcpu %u address 0x%016llx error_code 0x%llx\",\n+\t\t__entry->vcpu_id,\n+\t\t__entry->fault_address,\n+\t\t__entry->error_code)\n+);\n+\n #endif /* _TRACE_RSICV_KVM_H */\n\n #undef TRACE_INCLUDE_PATH\ndiff --git a/arch/riscv/kvm/vcpu_exit.c b/arch/riscv/kvm/vcpu_exit.c\nindex 0bb0c51e3c89..0cfb0149da9f 100644\n--- a/arch/riscv/kvm/vcpu_exit.c\n+++ b/arch/riscv/kvm/vcpu_exit.c\n@@ -11,6 +11,7 @@\n #include \n #include \n #include \n+#include \"trace.h\"\n\n static int gstage_page_fault(struct kvm_vcpu *vcpu, struct kvm_run *run,\n \t\t\t struct kvm_cpu_trap *trap)\n@@ -43,6 +44,8 @@ static int gstage_page_fault(struct kvm_vcpu *vcpu, struct kvm_run *run,\n \t\t};\n \t}\n\n+\ttrace_kvm_page_fault(vcpu, fault_addr, trap->scause);\n+\n \tret = kvm_riscv_mmu_map(vcpu, memslot, fault_addr, hva,\n \t\t\t\t(trap->scause == EXC_STORE_GUEST_PAGE_FAULT) ? true : false,\n \t\t\t\t&host_map);\n","prefixes":["2/3"]}