From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B925DC1975A for ; Tue, 17 Mar 2020 19:54:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 998F5206EC for ; Tue, 17 Mar 2020 19:54:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726555AbgCQTx4 (ORCPT ); Tue, 17 Mar 2020 15:53:56 -0400 Received: from mga07.intel.com ([134.134.136.100]:43598 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726294AbgCQTx4 (ORCPT ); Tue, 17 Mar 2020 15:53:56 -0400 IronPort-SDR: YAMXTaUQvhbfi9/EglHLIBThxC7TJN/SYy/Z1tvvfsLa3onwntOUlu4LFI0+jUaK0JwFKSVcaR iyTND9zr+BRg== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Mar 2020 12:53:55 -0700 IronPort-SDR: 6bQH3deRFaoj7AMo2kEC84Wui6P91HGfgh+8j69z3O5xM+wIxLPd9Kp/jkmPr7vwKmp+RTVxnR WLm903I6jmQQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,565,1574150400"; d="scan'208";a="233604300" Received: from sjchrist-coffee.jf.intel.com ([10.54.74.202]) by orsmga007.jf.intel.com with ESMTP; 17 Mar 2020 12:53:55 -0700 From: Sean Christopherson To: Paolo Bonzini Cc: Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Xiaoyao Li , Jan Kiszka Subject: [PATCH 1/2] KVM: x86: Add requested index to the CPUID tracepoint Date: Tue, 17 Mar 2020 12:53:53 -0700 Message-Id: <20200317195354.28384-2-sean.j.christopherson@intel.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200317195354.28384-1-sean.j.christopherson@intel.com> References: <20200317195354.28384-1-sean.j.christopherson@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Output the requested index when tracing CPUID emulation; it's basically mandatory for leafs where the index is meaningful, and is helpful for verifying KVM correctness even when the index isn't meaningful, e.g. the trace for a Linux guest's hypervisor_cpuid_base() probing appears to be broken (returns all zeroes) at first glance, but is correct because the index is non-zero, i.e. the output values correspond to a random index in the maximum basic leaf. Suggested-by: Xiaoyao Li Cc: Jan Kiszka Signed-off-by: Sean Christopherson --- arch/x86/kvm/cpuid.c | 2 +- arch/x86/kvm/trace.h | 13 ++++++++----- 2 files changed, 9 insertions(+), 6 deletions(-) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 08280d8a2ac9..bccaae0df668 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -1026,7 +1026,7 @@ bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, } } } - trace_kvm_cpuid(orig_function, *eax, *ebx, *ecx, *edx, exact); + trace_kvm_cpuid(orig_function, index, *eax, *ebx, *ecx, *edx, exact); return exact; } EXPORT_SYMBOL_GPL(kvm_cpuid); diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h index 6c4d9b4caf07..27270ba0f05f 100644 --- a/arch/x86/kvm/trace.h +++ b/arch/x86/kvm/trace.h @@ -151,12 +151,14 @@ TRACE_EVENT(kvm_fast_mmio, * Tracepoint for cpuid. */ TRACE_EVENT(kvm_cpuid, - TP_PROTO(unsigned int function, unsigned long rax, unsigned long rbx, - unsigned long rcx, unsigned long rdx, bool found), - TP_ARGS(function, rax, rbx, rcx, rdx, found), + TP_PROTO(unsigned int function, unsigned int index, unsigned long rax, + unsigned long rbx, unsigned long rcx, unsigned long rdx, + bool found), + TP_ARGS(function, index, rax, rbx, rcx, rdx, found), TP_STRUCT__entry( __field( unsigned int, function ) + __field( unsigned int, index ) __field( unsigned long, rax ) __field( unsigned long, rbx ) __field( unsigned long, rcx ) @@ -166,6 +168,7 @@ TRACE_EVENT(kvm_cpuid, TP_fast_assign( __entry->function = function; + __entry->index = index; __entry->rax = rax; __entry->rbx = rbx; __entry->rcx = rcx; @@ -173,8 +176,8 @@ TRACE_EVENT(kvm_cpuid, __entry->found = found; ), - TP_printk("func %x rax %lx rbx %lx rcx %lx rdx %lx, cpuid entry %s", - __entry->function, __entry->rax, + TP_printk("func %x idx %x rax %lx rbx %lx rcx %lx rdx %lx, cpuid entry %s", + __entry->function, __entry->index, __entry->rax, __entry->rbx, __entry->rcx, __entry->rdx, __entry->found ? "found" : "not found") ); -- 2.24.1