From patchwork Wed Jul 1 18:29:03 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Alex_Benn=C3=A9e?= X-Patchwork-Id: 50545 Return-Path: X-Original-To: linaro@patches.linaro.org Delivered-To: linaro@patches.linaro.org Received: from mail-lb0-f199.google.com (mail-lb0-f199.google.com [209.85.217.199]) by ip-10-151-82-157.ec2.internal (Postfix) with ESMTPS id 72AF4229DF for ; Wed, 1 Jul 2015 18:31:03 +0000 (UTC) Received: by lbcui10 with SMTP id ui10sf7846807lbc.0 for ; Wed, 01 Jul 2015 11:31:02 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:delivered-to:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-type :content-transfer-encoding:sender:precedence:list-id :x-original-sender:x-original-authentication-results:mailing-list :list-post:list-help:list-archive:list-unsubscribe; bh=TIxp1hVcbeIyfeQzLhk4mC6jxcrg9VeNmiEsERkKox4=; b=dVww6pn9u40rOP2pywPEhPnV0MEljsojSkDp3PDia18Lu/euw4qCA+85AaVSaTkbnH 3qLHZeIro2dwVMxrRNpy3/0YWCRjfLvp5XE+K38WMDELi/mYAmVU2T4HW3svnXd28rtl hHnuWtqCVRbgpdj2Bz9wCmb6PeyzaPAp0wAL02IBnn70ZxbG31/zhf8OgK+riIiqX/xs ec3PS2AURONvstx4mkjvY0SHm81QdQqgwRNmLQsS3T6/yQ3bnj1wLc4p11UA4dQP6bwO kEp5pMVqod3xasRzHvRbo9AnLKY9xXvSgunVhqPqIFzDK6YYHCg6ZCD7Xpf+rdiQkR6v r1FQ== X-Gm-Message-State: ALoCoQnCMv0yKPCjFdW/uiKteCHCr5PzfOG6Nv93ChP/EjgnrQ3pzlkC9YnyXu7jZPUCMSN5J5mn X-Received: by 10.181.12.104 with SMTP id ep8mr15606692wid.7.1435775462401; Wed, 01 Jul 2015 11:31:02 -0700 (PDT) X-BeenThere: patchwork-forward@linaro.org Received: by 10.152.115.161 with SMTP id jp1ls219688lab.96.gmail; Wed, 01 Jul 2015 11:31:02 -0700 (PDT) X-Received: by 10.152.36.102 with SMTP id p6mr26668890laj.19.1435775462204; Wed, 01 Jul 2015 11:31:02 -0700 (PDT) Received: from mail-lb0-f178.google.com (mail-lb0-f178.google.com. [209.85.217.178]) by mx.google.com with ESMTPS id i7si2376031lah.164.2015.07.01.11.31.02 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 01 Jul 2015 11:31:02 -0700 (PDT) Received-SPF: pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.217.178 as permitted sender) client-ip=209.85.217.178; Received: by lbbpo10 with SMTP id po10so18132422lbb.3 for ; Wed, 01 Jul 2015 11:31:02 -0700 (PDT) X-Received: by 10.152.22.99 with SMTP id c3mr27258498laf.32.1435775461960; Wed, 01 Jul 2015 11:31:01 -0700 (PDT) X-Forwarded-To: patchwork-forward@linaro.org X-Forwarded-For: patch@linaro.org patchwork-forward@linaro.org Delivered-To: patch@linaro.org Received: by 10.112.108.230 with SMTP id hn6csp787129lbb; Wed, 1 Jul 2015 11:31:00 -0700 (PDT) X-Received: by 10.70.131.73 with SMTP id ok9mr57316731pdb.109.1435775459823; Wed, 01 Jul 2015 11:30:59 -0700 (PDT) Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id qx6si4755892pab.13.2015.07.01.11.30.58; Wed, 01 Jul 2015 11:30:59 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753873AbbGASax (ORCPT + 29 others); Wed, 1 Jul 2015 14:30:53 -0400 Received: from mail-wi0-f177.google.com ([209.85.212.177]:34754 "EHLO mail-wi0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753570AbbGAS3p (ORCPT ); Wed, 1 Jul 2015 14:29:45 -0400 Received: by wiar9 with SMTP id r9so77998898wia.1 for ; Wed, 01 Jul 2015 11:29:43 -0700 (PDT) X-Received: by 10.180.96.1 with SMTP id do1mr8368850wib.37.1435775383762; Wed, 01 Jul 2015 11:29:43 -0700 (PDT) Received: from zen.linaro.local ([81.128.185.34]) by mx.google.com with ESMTPSA id lj14sm4605451wic.18.2015.07.01.11.29.41 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 01 Jul 2015 11:29:41 -0700 (PDT) Received: from zen.linaroharston (localhost [127.0.0.1]) by zen.linaro.local (Postfix) with ESMTP id 187673E09ED; Wed, 1 Jul 2015 19:29:41 +0100 (BST) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, christoffer.dall@linaro.org, marc.zyngier@arm.com, peter.maydell@linaro.org, agraf@suse.de, drjones@redhat.com, pbonzini@redhat.com, zhichao.huang@linaro.org Cc: jan.kiszka@siemens.com, dahi@linux.vnet.ibm.com, r65777@freescale.com, bp@suse.de, =?UTF-8?q?Alex=20Benn=C3=A9e?= , Gleb Natapov , Catalin Marinas , Will Deacon , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v7 11/11] KVM: arm64: add trace points for guest_debug debug Date: Wed, 1 Jul 2015 19:29:03 +0100 Message-Id: <1435775343-20034-12-git-send-email-alex.bennee@linaro.org> X-Mailer: git-send-email 2.4.5 In-Reply-To: <1435775343-20034-1-git-send-email-alex.bennee@linaro.org> References: <1435775343-20034-1-git-send-email-alex.bennee@linaro.org> MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: list List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: alex.bennee@linaro.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.217.178 as permitted sender) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , This includes trace points for: kvm_arch_setup_guest_debug kvm_arch_clear_guest_debug I've also added some generic register setting trace events and also a trace point to dump the array of hardware registers. Signed-off-by: Alex Bennée --- v3 - add trace event for debug access. - remove short trace #define, rename trace events - use __print_array with fixed array instead of own func - rationalise trace points (only one per register changed) - add vcpu ptr to the debug_setup trace - remove :: in prints v4 - u32/u64 split on debug registers - fix for renames - add tracing of traps/set_guest_debug - remove handle_guest_debug trace v5 - minor print fmt fix - rm pstate traces v6 - fix merge conflicts - update control reg tracking to u64 (abi change) v7 - fix merge conflicts from ioctl move - fix other minor merge conflicts - fixes for the re-factored sys_regs code --- arch/arm64/kvm/debug.c | 35 ++++++++++++- arch/arm64/kvm/guest.c | 4 ++ arch/arm64/kvm/sys_regs.c | 21 ++++++++ arch/arm64/kvm/trace.h | 123 ++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 182 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c index 46b73d7..119107f 100644 --- a/arch/arm64/kvm/debug.c +++ b/arch/arm64/kvm/debug.c @@ -24,6 +24,8 @@ #include #include +#include "trace.h" + /* These are the bits of MDSCR_EL1 we may manipulate */ #define MDSCR_EL1_DEBUG_MASK (DBG_MDSCR_SS | \ DBG_MDSCR_KDE | \ @@ -44,11 +46,17 @@ static DEFINE_PER_CPU(u32, mdcr_el2); static void save_guest_debug_regs(struct kvm_vcpu *vcpu) { vcpu->arch.guest_debug_preserved.mdscr_el1 = vcpu_sys_reg(vcpu, MDSCR_EL1); + + trace_kvm_arm_set_dreg32("Saved MDSCR_EL1", + vcpu->arch.guest_debug_preserved.mdscr_el1); } static void restore_guest_debug_regs(struct kvm_vcpu *vcpu) { vcpu_sys_reg(vcpu, MDSCR_EL1) = vcpu->arch.guest_debug_preserved.mdscr_el1; + + trace_kvm_arm_set_dreg32("Restored MDSCR_EL1", + vcpu_sys_reg(vcpu, MDSCR_EL1)); } /** @@ -99,6 +107,8 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) { bool trap_debug = !(vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY); + trace_kvm_arm_setup_debug(vcpu, vcpu->guest_debug); + vcpu->arch.mdcr_el2 = __this_cpu_read(mdcr_el2) & MDCR_EL2_HPMN_MASK; vcpu->arch.mdcr_el2 |= (MDCR_EL2_TPM | MDCR_EL2_TPMCR | @@ -140,6 +150,8 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) vcpu_sys_reg(vcpu, MDSCR_EL1) &= ~DBG_MDSCR_SS; } + trace_kvm_arm_set_dreg32("SPSR_EL2", *vcpu_cpsr(vcpu)); + /* * HW Breakpoints and watchpoints * @@ -156,6 +168,14 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) vcpu->arch.debug_ptr = &vcpu->arch.external_debug_state; vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY; trap_debug = true; + + trace_kvm_arm_set_regset("BKPTS", get_num_brps(), + &vcpu->arch.debug_ptr->dbg_bcr[0], + &vcpu->arch.debug_ptr->dbg_bvr[0]); + + trace_kvm_arm_set_regset("WAPTS", get_num_wrps(), + &vcpu->arch.debug_ptr->dbg_wcr[0], + &vcpu->arch.debug_ptr->dbg_wvr[0]); } } @@ -165,10 +185,15 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) /* Trap debug register access */ if (trap_debug) vcpu->arch.mdcr_el2 |= MDCR_EL2_TDA; + + trace_kvm_arm_set_dreg32("MDCR_EL2", vcpu->arch.mdcr_el2); + trace_kvm_arm_set_dreg32("MDSCR_EL1", vcpu_sys_reg(vcpu, MDSCR_EL1)); } void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) { + trace_kvm_arm_clear_debug(vcpu->guest_debug); + if (vcpu->guest_debug) { restore_guest_debug_regs(vcpu); @@ -176,8 +201,16 @@ void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) * If we were using HW debug we need to restore the * debug_ptr to the guest debug state. */ - if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) + if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) { kvm_arm_reset_debug_ptr(vcpu); + trace_kvm_arm_set_regset("BKPTS", get_num_brps(), + &vcpu->arch.debug_ptr->dbg_bcr[0], + &vcpu->arch.debug_ptr->dbg_bvr[0]); + + trace_kvm_arm_set_regset("WAPTS", get_num_wrps(), + &vcpu->arch.debug_ptr->dbg_wcr[0], + &vcpu->arch.debug_ptr->dbg_wvr[0]); + } } } diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 6f1b249..48868d8 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -32,6 +32,8 @@ #include #include +#include "trace.h" + struct kvm_stats_debugfs_item debugfs_entries[] = { { NULL } }; @@ -350,6 +352,8 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg) { + trace_kvm_set_guest_debug(vcpu, dbg->control); + if (dbg->control & ~KVM_GUESTDBG_VALID_MASK) return -EINVAL; diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index f753a67..2c9aa68 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -38,6 +38,8 @@ #include "sys_regs.h" +#include "trace.h" + /* * All of this file is extremly similar to the ARM coproc.c, but the * types are different. My gut feeling is that it should be pretty @@ -208,6 +210,8 @@ static bool trap_debug_regs(struct kvm_vcpu *vcpu, *vcpu_reg(vcpu, p->Rt) = vcpu_sys_reg(vcpu, r->reg); } + trace_trap_reg(__func__, r->reg, p->is_write, *vcpu_reg(vcpu, p->Rt)); + return true; } @@ -245,6 +249,9 @@ static inline bool trap_bvr(struct kvm_vcpu *vcpu, vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg]); } + trace_trap_reg(__func__, rd->reg, p->is_write, + vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg]); + return true; } @@ -284,6 +291,9 @@ static inline bool trap_bcr(struct kvm_vcpu *vcpu, vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg]); } + trace_trap_reg(__func__, rd->reg, p->is_write, + vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg]); + return true; } @@ -323,6 +333,9 @@ static inline bool trap_wvr(struct kvm_vcpu *vcpu, vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]); } + trace_trap_reg(__func__, rd->reg, p->is_write, + vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]); + return true; } @@ -362,6 +375,9 @@ static inline bool trap_wcr(struct kvm_vcpu *vcpu, vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg]); } + trace_trap_reg(__func__, rd->reg, p->is_write, + vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg]); + return true; } @@ -719,6 +735,9 @@ static inline bool trap_xvr(struct kvm_vcpu *vcpu, vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg] >> 32); } + trace_trap_reg(__func__, rd->reg, p->is_write, + vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg]); + return true; } @@ -1200,6 +1219,8 @@ int kvm_handle_sys_reg(struct kvm_vcpu *vcpu, struct kvm_run *run) struct sys_reg_params params; unsigned long esr = kvm_vcpu_get_hsr(vcpu); + trace_kvm_handle_sys_reg(esr); + params.is_aarch32 = false; params.is_32bit = false; params.Op0 = (esr >> 20) & 3; diff --git a/arch/arm64/kvm/trace.h b/arch/arm64/kvm/trace.h index 157416e9..7fb0008 100644 --- a/arch/arm64/kvm/trace.h +++ b/arch/arm64/kvm/trace.h @@ -44,6 +44,129 @@ TRACE_EVENT(kvm_hvc_arm64, __entry->vcpu_pc, __entry->r0, __entry->imm) ); +TRACE_EVENT(kvm_arm_setup_debug, + TP_PROTO(struct kvm_vcpu *vcpu, __u32 guest_debug), + TP_ARGS(vcpu, guest_debug), + + TP_STRUCT__entry( + __field(struct kvm_vcpu *, vcpu) + __field(__u32, guest_debug) + ), + + TP_fast_assign( + __entry->vcpu = vcpu; + __entry->guest_debug = guest_debug; + ), + + TP_printk("vcpu: %p, flags: 0x%08x", __entry->vcpu, __entry->guest_debug) +); + +TRACE_EVENT(kvm_arm_clear_debug, + TP_PROTO(__u32 guest_debug), + TP_ARGS(guest_debug), + + TP_STRUCT__entry( + __field(__u32, guest_debug) + ), + + TP_fast_assign( + __entry->guest_debug = guest_debug; + ), + + TP_printk("flags: 0x%08x", __entry->guest_debug) +); + +TRACE_EVENT(kvm_arm_set_dreg32, + TP_PROTO(const char *name, __u32 value), + TP_ARGS(name, value), + + TP_STRUCT__entry( + __field(const char *, name) + __field(__u32, value) + ), + + TP_fast_assign( + __entry->name = name; + __entry->value = value; + ), + + TP_printk("%s: 0x%08x", __entry->name, __entry->value) +); + +TRACE_EVENT(kvm_arm_set_regset, + TP_PROTO(const char *type, int len, __u64 *control, __u64 *value), + TP_ARGS(type, len, control, value), + TP_STRUCT__entry( + __field(const char *, name) + __field(int, len) + __array(u64, ctrls, 16) + __array(u64, values, 16) + ), + TP_fast_assign( + __entry->name = type; + __entry->len = len; + memcpy(__entry->ctrls, control, len << 3); + memcpy(__entry->values, value, len << 3); + ), + TP_printk("%d %s CTRL:%s VALUE:%s", __entry->len, __entry->name, + __print_array(__entry->ctrls, __entry->len, sizeof(__u64)), + __print_array(__entry->values, __entry->len, sizeof(__u64))) +); + +TRACE_EVENT(trap_reg, + TP_PROTO(const char *fn, int reg, bool is_write, u64 write_value), + TP_ARGS(fn, reg, is_write, write_value), + + TP_STRUCT__entry( + __field(const char *, fn) + __field(int, reg) + __field(bool, is_write) + __field(u64, write_value) + ), + + TP_fast_assign( + __entry->fn = fn; + __entry->reg = reg; + __entry->is_write = is_write; + __entry->write_value = write_value; + ), + + TP_printk("%s %s reg %d (0x%08llx)", __entry->fn, __entry->is_write?"write to":"read from", __entry->reg, __entry->write_value) +); + +TRACE_EVENT(kvm_handle_sys_reg, + TP_PROTO(unsigned long hsr), + TP_ARGS(hsr), + + TP_STRUCT__entry( + __field(unsigned long, hsr) + ), + + TP_fast_assign( + __entry->hsr = hsr; + ), + + TP_printk("HSR 0x%08lx", __entry->hsr) +); + +TRACE_EVENT(kvm_set_guest_debug, + TP_PROTO(struct kvm_vcpu *vcpu, __u32 guest_debug), + TP_ARGS(vcpu, guest_debug), + + TP_STRUCT__entry( + __field(struct kvm_vcpu *, vcpu) + __field(__u32, guest_debug) + ), + + TP_fast_assign( + __entry->vcpu = vcpu; + __entry->guest_debug = guest_debug; + ), + + TP_printk("vcpu: %p, flags: 0x%08x", __entry->vcpu, __entry->guest_debug) +); + + #endif /* _TRACE_ARM64_KVM_H */ #undef TRACE_INCLUDE_PATH