From nobody Thu Sep 18 21:40:34 2025 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 B2B84C4332F for ; Thu, 1 Dec 2022 23:28:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231953AbiLAX23 (ORCPT ); Thu, 1 Dec 2022 18:28:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58044 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231937AbiLAX1y (ORCPT ); Thu, 1 Dec 2022 18:27:54 -0500 Received: from mail-pg1-x54a.google.com (mail-pg1-x54a.google.com [IPv6:2607:f8b0:4864:20::54a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C2266CCFCE for ; Thu, 1 Dec 2022 15:27:19 -0800 (PST) Received: by mail-pg1-x54a.google.com with SMTP id m9-20020a63ed49000000b00477f449365fso2937095pgk.15 for ; Thu, 01 Dec 2022 15:27:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=7SXAjG1M+IBfGsFtMHywIkRjTzn4Js8KsrZjxZEQBMU=; b=ACp2sPOEEhtUBdUDYUmigXNlNuydDo0L5gzT5adI9Ji7FnPzwS3jyQFj4800dH1gw9 aarAXgAVG3T7xg4Qhv/0Lq9enspYAIWfp8dNBJRTmS+OV8tF9ebUWwetC6n5CUXx24+d 0uT9DyPL9JhKc9a+6znnfRysveD6YN6SmC+p/THzkHUOU2Qy5pq7IvsseLzKTf9lvQpk jBnmpRrZ8oaXv4SPUSlSo32xL0T3HTioALanjDXwhPrU8IvuVvweucc4eV0oxIvVYTrE 6yoSVAkLxA59E0IbPqoP/RYWydh6JrEZiaA0oBmaahC/ifgo4vHX4h36dkajhv5R/+U3 0NKQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=7SXAjG1M+IBfGsFtMHywIkRjTzn4Js8KsrZjxZEQBMU=; b=s+N0dkZZmEH03u1RjQvVr6VdzY2UWswBVaGYXCmZgHw9R89FZb76sM850dXt5mZyLl CbLhSZqBdApKNcdiAKACw+iP2pqgY5Ymz8q9Oz1jtv2l6l9EEr1CVq2PeH4W7NA9+xYZ /u0mN+e4AjX4M54K6nukHr8w60MxQHUM2pUvRnak3E2Pg0lrKczWJKSa+C02qyIW4p7i or8dTUb4qwV6m1jmRIeo23hbVuVkVRRzY1xtDWEEhY64dt2STR3ndkQx3FAM+FWJyJP7 FV9E8sO1f9XElo7cazUFGUgPuJrEZNPSn3alLjMm9ID5BiMhhrW0awb+YlKGT0212eIJ pfmg== X-Gm-Message-State: ANoB5plN3bkxG6qut/MwGVSIX0ycZEKhIHJS+olJDjKT79rH5/8ozoKW 6oXsSRlGoe85DAx/suXQSGqDeRiIvnY= X-Google-Smtp-Source: AA0mqf5WubwN175lIMTyZxAOD6OhDkttOnqc3F5KtxxV+MMxPH5WaxC+3QCgYB5pFp1bK+wzYaA2AQ5YxyA= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:90a:d086:b0:219:227d:d91f with SMTP id k6-20020a17090ad08600b00219227dd91fmr2875299pju.0.1669937238934; Thu, 01 Dec 2022 15:27:18 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 1 Dec 2022 23:26:49 +0000 In-Reply-To: <20221201232655.290720-1-seanjc@google.com> Mime-Version: 1.0 References: <20221201232655.290720-1-seanjc@google.com> X-Mailer: git-send-email 2.39.0.rc0.267.gcb52ba06e7-goog Message-ID: <20221201232655.290720-11-seanjc@google.com> Subject: [PATCH 10/16] x86/virt: KVM: Move VMXOFF helpers into KVM VMX From: Sean Christopherson To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Sean Christopherson , Paolo Bonzini Cc: "H. Peter Anvin" , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Andrew Cooper Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Now that VMX is disabled in emergencies via the virt callbacks, move the VMXOFF helpers into KVM, the only remaining user. No functional change intended. Signed-off-by: Sean Christopherson --- arch/x86/include/asm/virtext.h | 42 ---------------------------------- arch/x86/kvm/vmx/vmx.c | 29 ++++++++++++++++++++--- 2 files changed, 26 insertions(+), 45 deletions(-) diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h index c5df63c606be..0b373543514f 100644 --- a/arch/x86/include/asm/virtext.h +++ b/arch/x86/include/asm/virtext.h @@ -19,48 +19,6 @@ #include #include =20 -/* - * VMX functions: - */ -/** - * cpu_vmxoff() - Disable VMX on the current CPU - * - * Disable VMX and clear CR4.VMXE (even if VMXOFF faults) - * - * Note, VMXOFF causes a #UD if the CPU is !post-VMXON, but it's impossibl= e to - * atomically track post-VMXON state, e.g. this may be called in NMI conte= xt. - * Eat all faults as all other faults on VMXOFF faults are mode related, i= .e. - * faults are guaranteed to be due to the !post-VMXON check unless the CPU= is - * magically in RM, VM86, compat mode, or at CPL>0. - */ -static inline int cpu_vmxoff(void) -{ - asm_volatile_goto("1: vmxoff\n\t" - _ASM_EXTABLE(1b, %l[fault]) - ::: "cc", "memory" : fault); - - cr4_clear_bits(X86_CR4_VMXE); - return 0; - -fault: - cr4_clear_bits(X86_CR4_VMXE); - return -EIO; -} - -static inline int cpu_vmx_enabled(void) -{ - return __read_cr4() & X86_CR4_VMXE; -} - -/** Disable VMX if it is enabled on the current CPU - */ -static inline void __cpu_emergency_vmxoff(void) -{ - if (cpu_vmx_enabled()) - cpu_vmxoff(); -} - - /* * SVM functions: */ diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 5bdcae435897..8be99651dcc9 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -47,7 +47,6 @@ #include #include #include -#include #include =20 #include "capabilities.h" @@ -743,6 +742,29 @@ static int vmx_set_guest_uret_msr(struct vcpu_vmx *vmx, return ret; } =20 +/* + * Disable VMX and clear CR4.VMXE (even if VMXOFF faults) + * + * Note, VMXOFF causes a #UD if the CPU is !post-VMXON, but it's impossibl= e to + * atomically track post-VMXON state, e.g. this may be called in NMI conte= xt. + * Eat all faults as all other faults on VMXOFF faults are mode related, i= .e. + * faults are guaranteed to be due to the !post-VMXON check unless the CPU= is + * magically in RM, VM86, compat mode, or at CPL>0. + */ +static int kvm_cpu_vmxoff(void) +{ + asm_volatile_goto("1: vmxoff\n\t" + _ASM_EXTABLE(1b, %l[fault]) + ::: "cc", "memory" : fault); + + cr4_clear_bits(X86_CR4_VMXE); + return 0; + +fault: + cr4_clear_bits(X86_CR4_VMXE); + return -EIO; +} + static void vmx_emergency_disable(void) { int cpu =3D raw_smp_processor_id(); @@ -752,7 +774,8 @@ static void vmx_emergency_disable(void) loaded_vmcss_on_cpu_link) vmcs_clear(v->vmcs); =20 - __cpu_emergency_vmxoff(); + if (__read_cr4() & X86_CR4_VMXE) + kvm_cpu_vmxoff(); } =20 static void __loaded_vmcs_clear(void *arg) @@ -2814,7 +2837,7 @@ static void vmx_hardware_disable(void) { vmclear_local_loaded_vmcss(); =20 - if (cpu_vmxoff()) + if (kvm_cpu_vmxoff()) kvm_spurious_fault(); =20 hv_reset_evmcs(); --=20 2.39.0.rc0.267.gcb52ba06e7-goog