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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 338BCC04AAF for ; Tue, 21 May 2019 06:07:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F3973217D4 for ; Tue, 21 May 2019 06:07:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="AfTgyoeX" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727926AbfEUGHG (ORCPT ); Tue, 21 May 2019 02:07:06 -0400 Received: from mail-pf1-f196.google.com ([209.85.210.196]:39078 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726719AbfEUGHG (ORCPT ); Tue, 21 May 2019 02:07:06 -0400 Received: by mail-pf1-f196.google.com with SMTP id z26so8478948pfg.6; Mon, 20 May 2019 23:07:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=T2f0j+HcR+Hm2808+uYZ0INzAMJinwKKeoQwZ5KAAMI=; b=AfTgyoeXL7FvsFCYPAMw2WB6WEYULcybTi8Y4feHwmKhP32/yEDF7uQVjZCOD1BOyH MJkOKTFQTBy+9FR9fykBAuRzjhuYIMFY6LOJUotbnevwBeiCealuEvvzdv3t2799rSeh feljqw21jIYZLBfOMhKN3jDfh0PVDpcDsPpfqP5aVrv9DhEllO5x4ASFWNKqThoN0Trj Pazimk3nOviXHAB3wyl0VbQ4Dvwd0M1zmMDIGhszXhuKzZBxsh3LgR5NKRWv1Mn59Jvv PsuPJ+NDlziuakmxo10qlB5hxKS4p10i44atoayaiRyldpDnMGCuZU3fIIlhqQMllRV2 s12Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=T2f0j+HcR+Hm2808+uYZ0INzAMJinwKKeoQwZ5KAAMI=; b=H6n6IGbTdFraDRn3h0z+dcRso0p4U3dY16rK6MTppkkRZZ80a5TUAS09RzCtJA0ITz C3adAMALZp3Tq+s5qCwUiLzQBO+9gGYbbv++srOxgWGQ49F92k9iDE9cXpHfw+u0R9kf ZH2BfXnvF6xPTymtf7a3nYF3IdHbpdXoCTylz+qyJCujuLxSk6HkVyHJn9eiw8ycibno MX+f9socNtkqWQlh5/4vCzJN+dkCLqttbe1vNl46Y6BzTW9ls3J0WzYgDf1F8biIEfiC TnP5BM4nggxXvoMj9TURH32ltJhLDU7sJ5iYmRaH/PrZIeG3OH2vBuRmC3suimQi5sKs XB3g== X-Gm-Message-State: APjAAAXz+Px93naRAUKj5iV4RAteatoy0mFyCdnpGzyzvFAy0oJ387Yw /k1rQX+arNP+IO1SXIf39CuCOLb1 X-Google-Smtp-Source: APXvYqwK/Tl2RHm3mvIPhxToSh/2lEv1avoEWuM3BPxoT0DKr2jUctRvx8kGLha9eTQMMOzFVdc1+g== X-Received: by 2002:a63:495e:: with SMTP id y30mr37000742pgk.185.1558418825234; Mon, 20 May 2019 23:07:05 -0700 (PDT) Received: from localhost.localdomain ([203.205.141.123]) by smtp.googlemail.com with ESMTPSA id a15sm2351484pgv.4.2019.05.20.23.07.03 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 20 May 2019 23:07:04 -0700 (PDT) From: Wanpeng Li X-Google-Original-From: Wanpeng Li To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Sean Christopherson , Liran Alon , Konrad Rzeszutek Wilk Subject: [PATCH v2 3/3] KVM: X86: Emulate MSR_IA32_MISC_ENABLE MWAIT bit Date: Tue, 21 May 2019 14:06:54 +0800 Message-Id: <1558418814-6822-3-git-send-email-wanpengli@tencent.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1558418814-6822-1-git-send-email-wanpengli@tencent.com> References: <1558418814-6822-1-git-send-email-wanpengli@tencent.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Wanpeng Li MSR IA32_MISC_ENABLE bit 18, according to SDM: | When this bit is set to 0, the MONITOR feature flag is not set (CPUID.01H:ECX[bit 3] = 0). | This indicates that MONITOR/MWAIT are not supported. | | Software attempts to execute MONITOR/MWAIT will cause #UD when this bit is 0. | | When this bit is set to 1 (default), MONITOR/MWAIT are supported (CPUID.01H:ECX[bit 3] = 1). The CPUID.01H:ECX[bit 3] ought to mirror the value of the MSR bit, CPUID.01H:ECX[bit 3] is a better guard than kvm_mwait_in_guest(). kvm_mwait_in_guest() affects the behavior of MONITOR/MWAIT, not its guest visibility. This patch implements toggling of the CPUID bit based on guest writes to the MSR. Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Sean Christopherson Cc: Liran Alon Cc: Konrad Rzeszutek Wilk Signed-off-by: Wanpeng Li --- v1 -> v2: * hide behind KVM_CAP_DISABLE_QUIRKS arch/x86/include/uapi/asm/kvm.h | 1 + arch/x86/kvm/cpuid.c | 10 ++++++++++ arch/x86/kvm/x86.c | 10 ++++++++++ 3 files changed, 21 insertions(+) diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h index 7a0e64c..e3ae96b5 100644 --- a/arch/x86/include/uapi/asm/kvm.h +++ b/arch/x86/include/uapi/asm/kvm.h @@ -382,6 +382,7 @@ struct kvm_sync_regs { #define KVM_X86_QUIRK_CD_NW_CLEARED (1 << 1) #define KVM_X86_QUIRK_LAPIC_MMIO_HOLE (1 << 2) #define KVM_X86_QUIRK_OUT_7E_INC_RIP (1 << 3) +#define KVM_X86_QUIRK_MISC_ENABLE_MWAIT (1 << 4) #define KVM_STATE_NESTED_GUEST_MODE 0x00000001 #define KVM_STATE_NESTED_RUN_PENDING 0x00000002 diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index e18a9f9..f54d266 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -137,6 +137,16 @@ int kvm_update_cpuid(struct kvm_vcpu *vcpu) (best->eax & (1 << KVM_FEATURE_PV_UNHALT))) best->eax &= ~(1 << KVM_FEATURE_PV_UNHALT); + if (kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_MISC_ENABLE_MWAIT)) { + best = kvm_find_cpuid_entry(vcpu, 0x1, 0); + if (best) { + if (vcpu->arch.ia32_misc_enable_msr & MSR_IA32_MISC_ENABLE_MWAIT) + best->ecx |= F(MWAIT); + else + best->ecx &= ~F(MWAIT); + } + } + /* Update physical-address width */ vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu); kvm_mmu_reset_context(vcpu); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 765fe59..a4eb711 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2547,6 +2547,16 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) } break; case MSR_IA32_MISC_ENABLE: + if (kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_MISC_ENABLE_MWAIT) && + ((vcpu->arch.ia32_misc_enable_msr ^ data) & MSR_IA32_MISC_ENABLE_MWAIT)) { + if ((vcpu->arch.ia32_misc_enable_msr & MSR_IA32_MISC_ENABLE_MWAIT) && + !(data & MSR_IA32_MISC_ENABLE_MWAIT)) { + if (!guest_cpuid_has(vcpu, X86_FEATURE_XMM3)) + return 1; + } + vcpu->arch.ia32_misc_enable_msr = data; + kvm_update_cpuid(vcpu); + } vcpu->arch.ia32_misc_enable_msr = data; break; case MSR_IA32_SMBASE: -- 2.7.4