From nobody Sat Nov 30 04:25:54 2024 Received: from cstnet.cn (smtp21.cstnet.cn [159.226.251.21]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 40C23126C18; Thu, 12 Sep 2024 08:00:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726128057; cv=none; b=MXC0ItewgYL7+p6tB+EvK36zOOkUCUj8fVUeEwEJxLVXXyGaKcMal1ab1JE5MD8aENT8ZnnayZWADXKBrUZWnwmDBbo5/od68GY7erdwfkZxReuBUxcCCHyBEYbgg7gx24rNScBNDzwfjh/7z1hEKQ+YAFtNm2GaoqcWET7dPMY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726128057; c=relaxed/simple; bh=lxi1inTHfoRrsPGWOxlD/bQWfykJiPoB0o3rd3EVpys=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=d2Bl6wP+k49FiVIZsIdv0ntZHSlZikdnBX7DP3B0lZWChd1wd0uby3+7J7u+Mlzm2xsqF7mPnp71+WzE/Anwn2MwM/pKG1Ytxppg9KIM7DoPqLYxHGcM39k7bTr6IXdtnr6GXXzQsRAlUjnyO3rgwWE0ZJsz5v6213VTHwfGQAQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from zq-Legion-Y7000.. (unknown [180.111.103.6]) by APP-01 (Coremail) with SMTP id qwCowAAHDx+fn+JmKl39Ag--.56032S2; Thu, 12 Sep 2024 16:00:32 +0800 (CST) From: zhouquan@iscas.ac.cn To: anup@brainfault.org, ajones@ventanamicro.com, atishp@atishpatra.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org Cc: linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-perf-users@vger.kernel.org, Quan Zhou Subject: [PATCH v3 1/2] riscv: perf: add guest vs host distinction Date: Thu, 12 Sep 2024 16:00:29 +0800 Message-Id: X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qwCowAAHDx+fn+JmKl39Ag--.56032S2 X-Coremail-Antispam: 1UD129KBjvJXoWxXw45tF18Xw45CFy7tF43Wrg_yoW5WryfpF 4DCwn3KrWDWr4I934ayF1Uuw15ur1rX3y7ZryI93y5ursFqF98JFn7Kw1UAryFyrykXFy8 J3WYvr45Cwn8taUanT9S1TB71UUUUUDqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUBj14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26r4j6ryUM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26F4j 6r4UJwA2z4x0Y4vEx4A2jsIE14v26F4UJVW0owA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gc CE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E 2Ix0cI8IcVAFwI0_JF0_Jw1lYx0Ex4A2jsIE14v26F4j6r4UJwAm72CE4IkC6x0Yz7v_Jr 0_Gr1lF7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7M4IIrI8v6xkF7I0E 8cxan2IY04v7M4kE6xkIj40Ew7xC0wCY1x0262kKe7AKxVWUtVW8ZwCF04k20xvY0x0EwI xGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480 Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7 IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k2 6cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxV AFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x0JUCYLPUUUUU= X-CM-SenderInfo: 52kr31xxdqqxpvfd2hldfou0/1tbiBg0SBmbifRSFRwAAsw Content-Type: text/plain; charset="utf-8" From: Quan Zhou Introduce basic guest support in perf, enabling it to distinguish between PMU interrupts in the host or guest, and collect fundamental information. Signed-off-by: Quan Zhou Reviewed-by: Andrew Jones --- arch/riscv/include/asm/perf_event.h | 7 ++++++ arch/riscv/kernel/perf_callchain.c | 38 +++++++++++++++++++++++++++++ 2 files changed, 45 insertions(+) diff --git a/arch/riscv/include/asm/perf_event.h b/arch/riscv/include/asm/p= erf_event.h index 665bbc9b2f84..c2b73c3aefe4 100644 --- a/arch/riscv/include/asm/perf_event.h +++ b/arch/riscv/include/asm/perf_event.h @@ -8,13 +8,20 @@ #ifndef _ASM_RISCV_PERF_EVENT_H #define _ASM_RISCV_PERF_EVENT_H =20 +#ifdef CONFIG_PERF_EVENTS #include #define perf_arch_bpf_user_pt_regs(regs) (struct user_regs_struct *)regs =20 +extern unsigned long perf_instruction_pointer(struct pt_regs *regs); +extern unsigned long perf_misc_flags(struct pt_regs *regs); +#define perf_misc_flags(regs) perf_misc_flags(regs) + #define perf_arch_fetch_caller_regs(regs, __ip) { \ (regs)->epc =3D (__ip); \ (regs)->s0 =3D (unsigned long) __builtin_frame_address(0); \ (regs)->sp =3D current_stack_pointer; \ (regs)->status =3D SR_PP; \ } +#endif + #endif /* _ASM_RISCV_PERF_EVENT_H */ diff --git a/arch/riscv/kernel/perf_callchain.c b/arch/riscv/kernel/perf_ca= llchain.c index 3348a61de7d9..d68271ac7434 100644 --- a/arch/riscv/kernel/perf_callchain.c +++ b/arch/riscv/kernel/perf_callchain.c @@ -58,6 +58,11 @@ void perf_callchain_user(struct perf_callchain_entry_ctx= *entry, { unsigned long fp =3D 0; =20 + if (perf_guest_state()) { + /* TODO: We don't support guest os callchain now */ + return; + } + fp =3D regs->s0; perf_callchain_store(entry, regs->epc); =20 @@ -74,5 +79,38 @@ static bool fill_callchain(void *entry, unsigned long pc) void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { + if (perf_guest_state()) { + /* TODO: We don't support guest os callchain now */ + return; + } + walk_stackframe(NULL, regs, fill_callchain, entry); } + +unsigned long perf_instruction_pointer(struct pt_regs *regs) +{ + if (perf_guest_state()) + return perf_guest_get_ip(); + + return instruction_pointer(regs); +} + +unsigned long perf_misc_flags(struct pt_regs *regs) +{ + unsigned int guest_state =3D perf_guest_state(); + unsigned long misc =3D 0; + + if (guest_state) { + if (guest_state & PERF_GUEST_USER) + misc |=3D PERF_RECORD_MISC_GUEST_USER; + else + misc |=3D PERF_RECORD_MISC_GUEST_KERNEL; + } else { + if (user_mode(regs)) + misc |=3D PERF_RECORD_MISC_USER; + else + misc |=3D PERF_RECORD_MISC_KERNEL; + } + + return misc; +} --=20 2.34.1 From nobody Sat Nov 30 04:25:54 2024 Received: from cstnet.cn (smtp21.cstnet.cn [159.226.251.21]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 53567126C18; Thu, 12 Sep 2024 08:00:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726128062; cv=none; b=IvJowywxN4PYgR5SFUgHLQUvWNSaUQb3End+Vz1YIO/p2eXijXc5A3dHX0SRP7kwyQsY+gk73TkU7dgKSBi7cHdio5WBEGHWgmClYABoaW0hQgX4/3hJuI8dvSLGu6B1RDBqh1YmNw27A6VMI0odgOlVMzuH3+5Le9GcqB6wukc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726128062; c=relaxed/simple; bh=aVlSPsUZBfRf+FqfFhEzZSGZfo19zpqp7vNBm72MltQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=LX3SfBsQXJNV3l8pxXHXq64BBZC+pl5T+fmxTMfdaCgtmXfUJjFChjEpDH2+szp6P0ZxMX/MdpfIFiEwZO7lR7QoIND4QuyymSB8YW4zwnm7Ls+vnMrbrr940ZV3HrHU60+Etb01Bp1e4k/iWFzczsXQ4JbJnn6xR4YkcycJ10Y= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from zq-Legion-Y7000.. (unknown [180.111.103.6]) by APP-01 (Coremail) with SMTP id qwCowAAHDx+pn+Jm9F_9Ag--.56033S2; Thu, 12 Sep 2024 16:00:41 +0800 (CST) From: zhouquan@iscas.ac.cn To: anup@brainfault.org, ajones@ventanamicro.com, atishp@atishpatra.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org Cc: linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-perf-users@vger.kernel.org, Quan Zhou Subject: [PATCH v3 2/2] riscv: KVM: add basic support for host vs guest profiling Date: Thu, 12 Sep 2024 16:00:38 +0800 Message-Id: <86e8f4eeb30dfc8700089cd88616e6cfb5a142ff.1726126795.git.zhouquan@iscas.ac.cn> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qwCowAAHDx+pn+Jm9F_9Ag--.56033S2 X-Coremail-Antispam: 1UD129KBjvJXoWxJFW7KrWUtFWxAryrGF15Arb_yoW5ZF1xpF Z8ur9Y9r4rKryxC34ayr1v9r45WFsYg343Xry7CFy5Wr45try8Jr4vg34DAry5JFW8Xa4S kFy8KFyruwn8Aw7anT9S1TB71UUUUUDqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUBj14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26r4j6ryUM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26F4j 6r4UJwA2z4x0Y4vEx4A2jsIE14v26F4UJVW0owA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gc CE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E 2Ix0cI8IcVAFwI0_Jw0_WrylYx0Ex4A2jsIE14v26F4j6r4UJwAm72CE4IkC6x0Yz7v_Jr 0_Gr1lF7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7M4IIrI8v6xkF7I0E 8cxan2IY04v7M4kE6xkIj40Ew7xC0wCY1x0262kKe7AKxVWUtVW8ZwCF04k20xvY0x0EwI xGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480 Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7 IYx2IY67AKxVWUCVW8JwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k2 6cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxV AFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x0JUXqXdUUUUU= X-CM-SenderInfo: 52kr31xxdqqxpvfd2hldfou0/1tbiCQ8SBmbifb+DkgAAsF Content-Type: text/plain; charset="utf-8" From: Quan Zhou For the information collected on the host side, we need to identify which data originates from the guest and record these events separately, this can be achieved by having KVM register perf callbacks. Signed-off-by: Quan Zhou Reviewed-by: Andrew Jones --- arch/riscv/include/asm/kvm_host.h | 10 ++++++++++ arch/riscv/kvm/Kconfig | 1 + arch/riscv/kvm/main.c | 12 ++++++++++-- arch/riscv/kvm/vcpu.c | 7 +++++++ 4 files changed, 28 insertions(+), 2 deletions(-) diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm= _host.h index 2e2254fd2a2a..35eab6e0f4ae 100644 --- a/arch/riscv/include/asm/kvm_host.h +++ b/arch/riscv/include/asm/kvm_host.h @@ -286,6 +286,16 @@ struct kvm_vcpu_arch { } sta; }; =20 +/* + * Returns true if a Performance Monitoring Interrupt (PMI), a.k.a. perf e= vent, + * arrived in guest context. For riscv, any event that arrives while a vC= PU is + * loaded is considered to be "in guest". + */ +static inline bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu) +{ + return IS_ENABLED(CONFIG_GUEST_PERF_EVENTS) && !!vcpu; +} + static inline void kvm_arch_sync_events(struct kvm *kvm) {} =20 #define KVM_RISCV_GSTAGE_TLB_MIN_ORDER 12 diff --git a/arch/riscv/kvm/Kconfig b/arch/riscv/kvm/Kconfig index 26d1727f0550..0c3cbb0915ff 100644 --- a/arch/riscv/kvm/Kconfig +++ b/arch/riscv/kvm/Kconfig @@ -32,6 +32,7 @@ config KVM select KVM_XFER_TO_GUEST_WORK select KVM_GENERIC_MMU_NOTIFIER select SCHED_INFO + select GUEST_PERF_EVENTS if PERF_EVENTS help Support hosting virtualized guest machines. =20 diff --git a/arch/riscv/kvm/main.c b/arch/riscv/kvm/main.c index bab2ec34cd87..734b48d8f6dd 100644 --- a/arch/riscv/kvm/main.c +++ b/arch/riscv/kvm/main.c @@ -51,6 +51,12 @@ void kvm_arch_hardware_disable(void) csr_write(CSR_HIDELEG, 0); } =20 +static void kvm_riscv_teardown(void) +{ + kvm_riscv_aia_exit(); + kvm_unregister_perf_callbacks(); +} + static int __init riscv_kvm_init(void) { int rc; @@ -105,9 +111,11 @@ static int __init riscv_kvm_init(void) kvm_info("AIA available with %d guest external interrupts\n", kvm_riscv_aia_nr_hgei); =20 + kvm_register_perf_callbacks(NULL); + rc =3D kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE); if (rc) { - kvm_riscv_aia_exit(); + kvm_riscv_teardown(); return rc; } =20 @@ -117,7 +125,7 @@ module_init(riscv_kvm_init); =20 static void __exit riscv_kvm_exit(void) { - kvm_riscv_aia_exit(); + kvm_riscv_teardown(); =20 kvm_exit(); } diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index 8d7d381737ee..e8ffb3456898 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -226,6 +226,13 @@ bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) return (vcpu->arch.guest_context.sstatus & SR_SPP) ? true : false; } =20 +#ifdef CONFIG_GUEST_PERF_EVENTS +unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu) +{ + return vcpu->arch.guest_context.sepc; +} +#endif + vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) { return VM_FAULT_SIGBUS; --=20 2.34.1