From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-177.mta1.migadu.com (out-177.mta1.migadu.com [95.215.58.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 636CA1BDABE for ; Thu, 19 Dec 2024 22:41:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.177 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734648113; cv=none; b=lOV8OsDN2CFNs1uAnix2fPIqN9EZVgKAQFsDvA2Y+19pOMW50x99uvRiPAJT/OeSeYTU+mLYhpNfghXO6qVyMRV+mzFEer+kDmz7Z4jT4DAp/Idz8BoLQq/KzkBqkqe0g3YzYA2ZrSFTawHSZgoQ1wE4+WdgR+NqRz7cNWS9dbk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734648113; c=relaxed/simple; bh=VASs9vmIyPmZtYv7J18TGpiqUS/I9/shhfYToRFqyiw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=nG6/xJ0Ri3FmH7/mkbmBnMnCyNte25VhZGNkEma0gtKlpjmVUXehAZbHbKi4aoEdzg8I9WiTyEDQdrzmMdxt/UxG3JmzarDQ0s0l+VfiPnrGaN4+qMFvFoKdmV0Jzn70bR6xPTLJXcoutrhja+j2gcPqeYHKK1J5628jsOpuCXk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=Zf+rs/QK; arc=none smtp.client-ip=95.215.58.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="Zf+rs/QK" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1734648109; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QnII9ddphTYBdXc5LJLgATEcwov/kpS6sLvniZwhZso=; b=Zf+rs/QKcPPdU33jPISgI7KB0fTcREg3WIOSrSY1CTx2Z85srxJqvF6WtmLP4CWejufNui Az6imEi+wuqD63v1i4p8X7iNkoPUvlmMNTctSIW16stIrPr6wXLVvr8pRmllT8vu7VYrwP 4ISZZd6bzqxNYiuoiIBRvC1KuWkBN2w= From: Oliver Upton To: kvmarm@lists.linux.dev Cc: Marc Zyngier , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Mingwei Zhang , Colton Lewis , Raghavendra Rao Ananta , James Clark , Oliver Upton Subject: [PATCH v4 09/19] KVM: arm64: Remove debug tracepoints Date: Thu, 19 Dec 2024 14:41:06 -0800 Message-Id: <20241219224116.3941496-10-oliver.upton@linux.dev> In-Reply-To: <20241219224116.3941496-1-oliver.upton@linux.dev> References: <20241219224116.3941496-1-oliver.upton@linux.dev> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT The debug tracepoints are a useless firehose of information that track implementation detail rather than well-defined events. These are going to be rather difficult to uphold now that the implementation is getting redone, so throw them out instead of bending over backwards. Tested-by: James Clark Signed-off-by: Oliver Upton --- arch/arm64/kvm/debug.c | 30 ------------ arch/arm64/kvm/sys_regs.c | 11 ----- arch/arm64/kvm/trace_handle_exit.h | 75 ------------------------------ 3 files changed, 116 deletions(-) diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c index 3222729a559d..62d7e4041814 100644 --- a/arch/arm64/kvm/debug.c +++ b/arch/arm64/kvm/debug.c @@ -14,7 +14,6 @@ #include #include -#include "trace.h" /* * save/restore_guest_debug_regs @@ -35,10 +34,6 @@ static void save_guest_debug_regs(struct kvm_vcpu *vcpu) u64 val = vcpu_read_sys_reg(vcpu, MDSCR_EL1); vcpu->arch.guest_debug_preserved.mdscr_el1 = val; - - trace_kvm_arm_set_dreg32("Saved MDSCR_EL1", - vcpu->arch.guest_debug_preserved.mdscr_el1); - vcpu->arch.guest_debug_preserved.pstate_ss = (*vcpu_cpsr(vcpu) & DBG_SPSR_SS); } @@ -49,9 +44,6 @@ static void restore_guest_debug_regs(struct kvm_vcpu *vcpu) vcpu_write_sys_reg(vcpu, val, MDSCR_EL1); - trace_kvm_arm_set_dreg32("Restored MDSCR_EL1", - vcpu_read_sys_reg(vcpu, MDSCR_EL1)); - if (vcpu->arch.guest_debug_preserved.pstate_ss) *vcpu_cpsr(vcpu) |= DBG_SPSR_SS; else @@ -110,8 +102,6 @@ static void kvm_arm_setup_mdcr_el2(struct kvm_vcpu *vcpu) write_sysreg(vcpu->arch.mdcr_el2, mdcr_el2); preempt_enable(); - - trace_kvm_arm_set_dreg32("MDCR_EL2", vcpu->arch.mdcr_el2); } /** @@ -209,8 +199,6 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) vcpu_write_sys_reg(vcpu, mdscr, MDSCR_EL1); } - trace_kvm_arm_set_dreg32("SPSR_EL2", *vcpu_cpsr(vcpu)); - /* * HW Breakpoints and watchpoints * @@ -228,14 +216,6 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) vcpu->arch.debug_ptr = &vcpu->arch.external_debug_state; vcpu_set_flag(vcpu, DEBUG_DIRTY); - 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]); - /* * The OS Lock blocks debug exceptions in all ELs when it is * enabled. If the guest has enabled the OS Lock, constrain its @@ -257,8 +237,6 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) /* If KDE or MDE are set, perform a full save/restore cycle. */ if (vcpu_read_sys_reg(vcpu, MDSCR_EL1) & (DBG_MDSCR_KDE | DBG_MDSCR_MDE)) vcpu_set_flag(vcpu, DEBUG_DIRTY); - - trace_kvm_arm_set_dreg32("MDSCR_EL1", vcpu_read_sys_reg(vcpu, MDSCR_EL1)); } void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) @@ -286,14 +264,6 @@ void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) */ 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/sys_regs.c b/arch/arm64/kvm/sys_regs.c index e45a096be669..8c5771572133 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -657,8 +657,6 @@ static bool trap_debug_regs(struct kvm_vcpu *vcpu, vcpu_set_flag(vcpu, DEBUG_DIRTY); kvm_debug_set_guest_ownership(vcpu); - trace_trap_reg(__func__, r->reg, p->is_write, p->regval); - return true; } @@ -711,8 +709,6 @@ static bool trap_bvr(struct kvm_vcpu *vcpu, else dbg_to_reg(vcpu, p, rd, dbg_reg); - trace_trap_reg(__func__, rd->CRm, p->is_write, *dbg_reg); - return true; } @@ -748,8 +744,6 @@ static bool trap_bcr(struct kvm_vcpu *vcpu, else dbg_to_reg(vcpu, p, rd, dbg_reg); - trace_trap_reg(__func__, rd->CRm, p->is_write, *dbg_reg); - return true; } @@ -785,9 +779,6 @@ static bool trap_wvr(struct kvm_vcpu *vcpu, else dbg_to_reg(vcpu, p, rd, dbg_reg); - trace_trap_reg(__func__, rd->CRm, p->is_write, - vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm]); - return true; } @@ -823,8 +814,6 @@ static bool trap_wcr(struct kvm_vcpu *vcpu, else dbg_to_reg(vcpu, p, rd, dbg_reg); - trace_trap_reg(__func__, rd->CRm, p->is_write, *dbg_reg); - return true; } diff --git a/arch/arm64/kvm/trace_handle_exit.h b/arch/arm64/kvm/trace_handle_exit.h index 064a58c19f48..f85415db7713 100644 --- a/arch/arm64/kvm/trace_handle_exit.h +++ b/arch/arm64/kvm/trace_handle_exit.h @@ -46,38 +46,6 @@ 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) -); - /* * The dreg32 name is a leftover from a distant past. This will really * output a 64bit value... @@ -99,49 +67,6 @@ TRACE_EVENT(kvm_arm_set_dreg32, TP_printk("%s: 0x%llx", __entry->name, __entry->value) ); -TRACE_DEFINE_SIZEOF(__u64); - -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%016llx)", __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), -- 2.39.5