From patchwork Wed Apr 17 21:34:02 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fenghua Yu X-Patchwork-Id: 10906269 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4C59117E0 for ; Wed, 17 Apr 2019 21:45:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3F21728A93 for ; Wed, 17 Apr 2019 21:45:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 33B5928BA9; Wed, 17 Apr 2019 21:45:45 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B04EE28A93 for ; Wed, 17 Apr 2019 21:45:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387951AbfDQVpa (ORCPT ); Wed, 17 Apr 2019 17:45:30 -0400 Received: from mga06.intel.com ([134.134.136.31]:13865 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387562AbfDQVp1 (ORCPT ); Wed, 17 Apr 2019 17:45:27 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Apr 2019 14:42:24 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,363,1549958400"; d="scan'208";a="224441189" Received: from romley-ivt3.sc.intel.com ([172.25.110.60]) by orsmga001.jf.intel.com with ESMTP; 17 Apr 2019 14:42:22 -0700 From: Fenghua Yu To: "Thomas Gleixner" , "Ingo Molnar" , "Borislav Petkov" , "H Peter Anvin" , "Paolo Bonzini" , "Dave Hansen" , "Ashok Raj" , "Peter Zijlstra" , "Ravi V Shankar" , "Xiaoyao Li " , "Christopherson Sean J" , "Kalle Valo" , "Michael Chan" Cc: "linux-kernel" , "x86" , kvm@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, Xiaoyao Li , Fenghua Yu Subject: [PATCH v7 12/21] kvm/x86: Emulate MSR IA32_CORE_CAPABILITY Date: Wed, 17 Apr 2019 14:34:02 -0700 Message-Id: <1555536851-17462-13-git-send-email-fenghua.yu@intel.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1555536851-17462-1-git-send-email-fenghua.yu@intel.com> References: <1555536851-17462-1-git-send-email-fenghua.yu@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Xiaoyao Li MSR IA32_CORE_CAPABILITY is a feature-enumerating MSR, bit 5 of which reports the capability of enabling detection of split locks (will be supported on future processors based on Tremont microarchitecture and later). CPUID.(EAX=7H,ECX=0):EDX[30] enumerates the presence of the IA32_CORE_CAPABILITY MSR. Please check the latest Intel 64 and IA-32 Architectures Software Developer's Manual for more detailed information on the MSR and the split lock bit. Since MSR_IA32_CORE_CAPABILITY is a feature-enumerating MSR that plays the similar role as CPUID, it can be emulated in software regardless of host's capability. What we need to do is to set the right value of it to report the capability of guest. In this patch, just set the guest's core_capability as 0, because we haven't added support of the features it indicates to guest. It's for bisectability. Signed-off-by: Xiaoyao Li Signed-off-by: Fenghua Yu --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/cpuid.c | 6 ++++++ arch/x86/kvm/x86.c | 22 ++++++++++++++++++++++ 3 files changed, 29 insertions(+) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index a9d03af34030..d4f9b13fcdd6 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -570,6 +570,7 @@ struct kvm_vcpu_arch { u64 ia32_xss; u64 microcode_version; u64 arch_capabilities; + u64 core_capability; /* * Paging state of the vcpu diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index fd3951638ae4..4a2f7892ea31 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -505,6 +505,12 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, * if the host doesn't support it. */ entry->edx |= F(ARCH_CAPABILITIES); + /* + * Since we emulate MSR IA32_CORE_CAPABILITY in + * software, we can always enable it for guest + * regardless of host's capability. + */ + entry->edx |= F(CORE_CAPABILITY); } else { entry->ebx = 0; entry->ecx = 0; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index a0d1fc80ac5a..e88be97d47b9 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1161,6 +1161,7 @@ static u32 emulated_msrs[] = { MSR_IA32_TSC_ADJUST, MSR_IA32_TSCDEADLINE, MSR_IA32_ARCH_CAPABILITIES, + MSR_IA32_CORE_CAPABILITY, MSR_IA32_MISC_ENABLE, MSR_IA32_MCG_STATUS, MSR_IA32_MCG_CTL, @@ -1200,6 +1201,7 @@ static u32 msr_based_features[] = { MSR_F10H_DECFG, MSR_IA32_UCODE_REV, + MSR_IA32_CORE_CAPABILITY, MSR_IA32_ARCH_CAPABILITIES, }; @@ -1227,9 +1229,17 @@ u64 kvm_get_arch_capabilities(void) } EXPORT_SYMBOL_GPL(kvm_get_arch_capabilities); +static u64 kvm_get_core_capability(void) +{ + return 0; +} + static int kvm_get_msr_feature(struct kvm_msr_entry *msr) { switch (msr->index) { + case MSR_IA32_CORE_CAPABILITY: + msr->data = kvm_get_core_capability(); + break; case MSR_IA32_ARCH_CAPABILITIES: msr->data = kvm_get_arch_capabilities(); break; @@ -2453,6 +2463,11 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) break; case MSR_EFER: return set_efer(vcpu, data); + case MSR_IA32_CORE_CAPABILITY: + if (!msr_info->host_initiated) + return 1; + vcpu->arch.core_capability = data; + break; case MSR_K7_HWCR: data &= ~(u64)0x40; /* ignore flush filter disable */ data &= ~(u64)0x100; /* ignore ignne emulation enable */ @@ -2764,6 +2779,12 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) case MSR_IA32_TSC: msr_info->data = kvm_scale_tsc(vcpu, rdtsc()) + vcpu->arch.tsc_offset; break; + case MSR_IA32_CORE_CAPABILITY: + if (!msr_info->host_initiated && + !guest_cpuid_has(vcpu, X86_FEATURE_CORE_CAPABILITY)) + return 1; + msr_info->data = vcpu->arch.core_capability; + break; case MSR_MTRRcap: case 0x200 ... 0x2ff: return kvm_mtrr_get_msr(vcpu, msr_info->index, &msr_info->data); @@ -8760,6 +8781,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) { vcpu->arch.arch_capabilities = kvm_get_arch_capabilities(); + vcpu->arch.core_capability = kvm_get_core_capability(); vcpu->arch.msr_platform_info = MSR_PLATFORM_INFO_CPUID_FAULT; kvm_vcpu_mtrr_init(vcpu); vcpu_load(vcpu);