From patchwork Wed Aug 30 12:42:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 13370392 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DF1A5C83F21 for ; Wed, 30 Aug 2023 18:32:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235788AbjH3SdA (ORCPT ); Wed, 30 Aug 2023 14:33:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43634 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244193AbjH3Mnp (ORCPT ); Wed, 30 Aug 2023 08:43:45 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 38569CC5 for ; Wed, 30 Aug 2023 05:42:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1693399376; 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=cXmGRleFgxAJpob9+MyMwqaQ6p2zsPjd+uLwoaCoCBo=; b=SbMfEnnKvyvoe2wqtKK8nrYXFlIAJMh/6NdYAaMGcGrDVtd0eds77uWU86IlU17tp47JPl SGH7ZwicX1t8tY+WGJNUVgTFvSLEYIuTE9voV9/04ICOqECQyoHQY9pfAtO8YeYjx+VCyj n2Tmhts/Zh57/iBDPnXJ7UGXxz+lGTA= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-63-e4BA0LOoNSePE1uuIFVhQQ-1; Wed, 30 Aug 2023 08:42:54 -0400 X-MC-Unique: e4BA0LOoNSePE1uuIFVhQQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A694E800CAB; Wed, 30 Aug 2023 12:42:53 +0000 (UTC) Received: from localhost.localdomain (unknown [10.45.224.27]) by smtp.corp.redhat.com (Postfix) with ESMTP id 429ED2026D35; Wed, 30 Aug 2023 12:42:51 +0000 (UTC) From: Maxim Levitsky To: kvm@vger.kernel.org Cc: "H. Peter Anvin" , linux-kernel@vger.kernel.org, Borislav Petkov , Thomas Gleixner , x86@kernel.org, Sean Christopherson , Ingo Molnar , Paolo Bonzini , Dave Hansen , Maxim Levitsky Subject: [PATCH 2/4] KVM: x86: add more information to the kvm_entry tracepoint Date: Wed, 30 Aug 2023 15:42:41 +0300 Message-Id: <20230830124243.671152-3-mlevitsk@redhat.com> In-Reply-To: <20230830124243.671152-1-mlevitsk@redhat.com> References: <20230830124243.671152-1-mlevitsk@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Add: - Flag showing that VM is in a guest mode on entry. - Flag showing that immediate vm exit is set to happen after the entry. - VMX/SVM specific interrupt injection info (like in a vm exit). Signed-off-by: Maxim Levitsky --- arch/x86/include/asm/kvm-x86-ops.h | 1 + arch/x86/include/asm/kvm_host.h | 5 ++++- arch/x86/kvm/svm/svm.c | 17 +++++++++++++++++ arch/x86/kvm/trace.h | 19 +++++++++++++++++-- arch/x86/kvm/vmx/vmx.c | 12 ++++++++++++ 5 files changed, 51 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h index f654a7f4cc8c0c..346fed6e3c33aa 100644 --- a/arch/x86/include/asm/kvm-x86-ops.h +++ b/arch/x86/include/asm/kvm-x86-ops.h @@ -99,6 +99,7 @@ KVM_X86_OP(get_l2_tsc_multiplier) KVM_X86_OP(write_tsc_offset) KVM_X86_OP(write_tsc_multiplier) KVM_X86_OP(get_exit_info) +KVM_X86_OP(get_entry_info) KVM_X86_OP(check_intercept) KVM_X86_OP(handle_exit_irqoff) KVM_X86_OP(sched_in) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 5f2a93f92a3df7..9cc5ac420f4052 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1661,13 +1661,16 @@ struct kvm_x86_ops { void (*write_tsc_multiplier)(struct kvm_vcpu *vcpu, u64 multiplier); /* - * Retrieve somewhat arbitrary exit information. Intended to + * Retrieve somewhat arbitrary exit/entry information. Intended to * be used only from within tracepoints or error paths. */ void (*get_exit_info)(struct kvm_vcpu *vcpu, u32 *reason, u64 *info1, u64 *info2, u32 *exit_int_info, u32 *exit_int_info_err_code); + void (*get_entry_info)(struct kvm_vcpu *vcpu, + u32 *inj_info, u32 *inj_info_error_code); + int (*check_intercept)(struct kvm_vcpu *vcpu, struct x86_instruction_info *info, enum x86_intercept_stage stage, diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 18d0895975dfd8..dd09cb8d7eaebf 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -3405,6 +3405,22 @@ static void svm_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason, *error_code = 0; } +static void svm_get_entry_info(struct kvm_vcpu *vcpu, + u32 *inj_info, + u32 *inj_info_error_code) +{ + struct vmcb_control_area *control = &to_svm(vcpu)->vmcb->control; + + *inj_info = control->event_inj; + + if ((*inj_info & SVM_EXITINTINFO_VALID) && + (*inj_info & SVM_EXITINTINFO_VALID_ERR)) + *inj_info_error_code = control->event_inj_err; + else + *inj_info_error_code = 0; + +} + static int svm_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath) { struct vcpu_svm *svm = to_svm(vcpu); @@ -4866,6 +4882,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = { .required_apicv_inhibits = AVIC_REQUIRED_APICV_INHIBITS, .get_exit_info = svm_get_exit_info, + .get_entry_info = svm_get_entry_info, .vcpu_after_set_cpuid = svm_vcpu_after_set_cpuid, diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h index 83843379813ee3..f4c56f59f5c11b 100644 --- a/arch/x86/kvm/trace.h +++ b/arch/x86/kvm/trace.h @@ -21,14 +21,29 @@ TRACE_EVENT(kvm_entry, TP_STRUCT__entry( __field( unsigned int, vcpu_id ) __field( unsigned long, rip ) - ), + __field( u32, inj_info ) + __field( u32, inj_info_err ) + __field( bool, guest_mode ) + __field( bool, req_imm_exit ) + ), TP_fast_assign( __entry->vcpu_id = vcpu->vcpu_id; __entry->rip = kvm_rip_read(vcpu); + + static_call(kvm_x86_get_entry_info)(vcpu, + &__entry->inj_info, + &__entry->inj_info_err); + + __entry->req_imm_exit = vcpu->arch.req_immediate_exit; + __entry->guest_mode = is_guest_mode(vcpu); ), - TP_printk("vcpu %u, rip 0x%lx", __entry->vcpu_id, __entry->rip) + TP_printk("vcpu %u, rip 0x%lx inj 0x%08x inj_error_code 0x%08x%s%s", + __entry->vcpu_id, __entry->rip, + __entry->inj_info, __entry->inj_info_err, + __entry->req_imm_exit ? " [imm exit]" : "", + __entry->guest_mode ? " [guest]" : "") ); /* diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 77ef6f02b3f42f..d662d546232171 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -6157,6 +6157,17 @@ static void vmx_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason, } } +static void vmx_get_entry_info(struct kvm_vcpu *vcpu, + u32 *inj_info, + u32 *inj_info_error_code) +{ + *inj_info = vmcs_read32(VM_ENTRY_INTR_INFO_FIELD); + if (is_exception_with_error_code(*inj_info)) + *inj_info_error_code = vmcs_read32(VM_ENTRY_EXCEPTION_ERROR_CODE); + else + *inj_info_error_code = 0; +} + static void vmx_destroy_pml_buffer(struct vcpu_vmx *vmx) { if (vmx->pml_pg) { @@ -8287,6 +8298,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = { .get_mt_mask = vmx_get_mt_mask, .get_exit_info = vmx_get_exit_info, + .get_entry_info = vmx_get_entry_info, .vcpu_after_set_cpuid = vmx_vcpu_after_set_cpuid,