From nobody Mon Feb 9 03:49:09 2026 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 A0B64C433FE for ; Wed, 2 Nov 2022 23:24:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230312AbiKBXYw (ORCPT ); Wed, 2 Nov 2022 19:24:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230173AbiKBXX6 (ORCPT ); Wed, 2 Nov 2022 19:23:58 -0400 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 348D0BE16 for ; Wed, 2 Nov 2022 16:20:17 -0700 (PDT) Received: by mail-pg1-x54a.google.com with SMTP id r126-20020a632b84000000b004393806c06eso96932pgr.4 for ; Wed, 02 Nov 2022 16:20:17 -0700 (PDT) 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=8Uwp9RFmCfERzBLmSD7eu3R9205OYPiiKzVrBdwzi3Q=; b=claCS3NwR+0MhaVoOkYFaVJrGvE24DgWhuNNCXqXu/cNJfkkndHulcRSJgg3bl5nWu ezVBksYs16BVUSTgISauIccvN25YpCmvIh4mNK/TCF369Fz0WIi83T4N5gGR00HTOqlx K4C+hDeDasVPWWZ4+BaBihKLBuiEHpr1atX0l4mNFYO6SnajcydRGegOOlYJnt7A9EyL WVgPBRXZNK+X1jmKSPJP+zS+z/RzaqKh78J6C240UaCJXUpsZczjlAYOamojaVu730U3 lpa507MtfiYoTLuSMZbMYA0BMaBQ45neHFSt224FOIaW6TS0lAzeoj2uBvYGp04j4B2C qnjQ== 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=8Uwp9RFmCfERzBLmSD7eu3R9205OYPiiKzVrBdwzi3Q=; b=4kAtWxxF8xZHqFZgYkGa+uvKku6gK+p0crVijpHdpbNEf6wHBOONjRuS4Jf1J3DQh7 UoXVIwzyAXJq594A/HU+0JIjWJ7nHWzfecO4YEGZQMH8p2LmDMLgkXNX/r9jPEOyf0PJ JhUY5ST/6bjdIkxBQUNKeYPaHs5lO3uPP2CRTnQULVV3p5xC2AeKmXgElZxv+vcuSthS gJGcmpVLExA3qmB3scyWrtQCWKdGF+4rPnQZq5wMzQSU2fmg///nzoMeniGnOi2KOYoI Ghz7gAq8f0+64MKVd1xILK7iZNdE76aQl4iHGNcUk6aTCp6ZpsytWu67IEkCcHXP2kwV q2+A== X-Gm-Message-State: ACrzQf0dJVqmEV6gZZBbpjIIhm7UhZ8PznIoTeTD1SqT9BL7MXjZLEwL RyI3CBf2voFt2wIBic22pbu1auQbk5U= X-Google-Smtp-Source: AMsMyM4zzGxwdwr8knwrNkc9Tyv3aipP6cXa6lLRwTf0OJezhzGXSJ4RMlmbp1AMJSMoes4N/0MT7VKx15M= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:90b:4d0d:b0:20d:6fc0:51 with SMTP id mw13-20020a17090b4d0d00b0020d6fc00051mr44233781pjb.10.1667431203634; Wed, 02 Nov 2022 16:20:03 -0700 (PDT) Reply-To: Sean Christopherson Date: Wed, 2 Nov 2022 23:18:56 +0000 In-Reply-To: <20221102231911.3107438-1-seanjc@google.com> Mime-Version: 1.0 References: <20221102231911.3107438-1-seanjc@google.com> X-Mailer: git-send-email 2.38.1.431.g37b22c650d-goog Message-ID: <20221102231911.3107438-30-seanjc@google.com> Subject: [PATCH 29/44] KVM: x86: Do CPU compatibility checks in x86 code From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Huacai Chen , Aleksandar Markovic , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Matthew Rosato , Eric Farman , Sean Christopherson , Vitaly Kuznetsov Cc: James Morse , Alexandru Elisei , Suzuki K Poulose , Oliver Upton , Atish Patra , David Hildenbrand , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Isaku Yamahata , Fabiano Rosas , Michael Ellerman , Chao Gao , Thomas Gleixner , Yuan Yao Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Move the CPU compatibility checks to pure x86 code, i.e. drop x86's use of the common kvm_x86_check_cpu_compat() arch hook. x86 is the only architecture that "needs" to do per-CPU compatibility checks, moving the logic to x86 will allow dropping the common code, and will also give x86 more control over when/how the compatibility checks are performed, e.g. TDX will need to enable hardware (do VMXON) in order to perform compatibility checks. Signed-off-by: Sean Christopherson --- arch/x86/kvm/svm/svm.c | 2 +- arch/x86/kvm/vmx/vmx.c | 2 +- arch/x86/kvm/x86.c | 49 ++++++++++++++++++++++++++++++++---------- 3 files changed, 40 insertions(+), 13 deletions(-) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index f48d07bfc3d7..368b4db4b240 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -5144,7 +5144,7 @@ static int __init svm_init(void) * Common KVM initialization _must_ come last, after this, /dev/kvm is * exposed to userspace! */ - r =3D kvm_init(&svm_init_ops, sizeof(struct vcpu_svm), + r =3D kvm_init(NULL, sizeof(struct vcpu_svm), __alignof__(struct vcpu_svm), THIS_MODULE); if (r) goto err_kvm_init; diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 81690fce0eb1..26baaccb659a 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -8562,7 +8562,7 @@ static int __init vmx_init(void) * Common KVM initialization _must_ come last, after this, /dev/kvm is * exposed to userspace! */ - r =3D kvm_init(&vmx_init_ops, sizeof(struct vcpu_vmx), + r =3D kvm_init(NULL, sizeof(struct vcpu_vmx), __alignof__(struct vcpu_vmx), THIS_MODULE); if (r) goto err_kvm_init; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 2b4530a33298..94831f1a1d04 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -9271,10 +9271,36 @@ static inline void kvm_ops_update(struct kvm_x86_in= it_ops *ops) kvm_pmu_ops_update(ops->pmu_ops); } =20 +struct kvm_cpu_compat_check { + struct kvm_x86_init_ops *ops; + int *ret; +}; + +static int kvm_x86_check_processor_compatibility(struct kvm_x86_init_ops *= ops) +{ + struct cpuinfo_x86 *c =3D &cpu_data(smp_processor_id()); + + WARN_ON(!irqs_disabled()); + + if (__cr4_reserved_bits(cpu_has, c) !=3D + __cr4_reserved_bits(cpu_has, &boot_cpu_data)) + return -EIO; + + return ops->check_processor_compatibility(); +} + +static void kvm_x86_check_cpu_compat(void *data) +{ + struct kvm_cpu_compat_check *c =3D data; + + *c->ret =3D kvm_x86_check_processor_compatibility(c->ops); +} + static int __kvm_x86_vendor_init(struct kvm_x86_init_ops *ops) { + struct kvm_cpu_compat_check c; u64 host_pat; - int r; + int r, cpu; =20 if (kvm_x86_ops.hardware_enable) { pr_err("kvm: already loaded vendor module '%s'\n", kvm_x86_ops.name); @@ -9354,6 +9380,14 @@ static int __kvm_x86_vendor_init(struct kvm_x86_init= _ops *ops) if (r !=3D 0) goto out_mmu_exit; =20 + c.ret =3D &r; + c.ops =3D ops; + for_each_online_cpu(cpu) { + smp_call_function_single(cpu, kvm_x86_check_cpu_compat, &c, 1); + if (r < 0) + goto out_hardware_unsetup; + } + /* * Point of no return! DO NOT add error paths below this point unless * absolutely necessary, as most operations from this point forward @@ -9396,6 +9430,8 @@ static int __kvm_x86_vendor_init(struct kvm_x86_init_= ops *ops) kvm_init_msr_list(); return 0; =20 +out_hardware_unsetup: + ops->runtime_ops->hardware_unsetup(); out_mmu_exit: kvm_mmu_vendor_module_exit(); out_free_percpu: @@ -12002,16 +12038,7 @@ void kvm_arch_hardware_disable(void) =20 int kvm_arch_check_processor_compat(void *opaque) { - struct cpuinfo_x86 *c =3D &cpu_data(smp_processor_id()); - struct kvm_x86_init_ops *ops =3D opaque; - - WARN_ON(!irqs_disabled()); - - if (__cr4_reserved_bits(cpu_has, c) !=3D - __cr4_reserved_bits(cpu_has, &boot_cpu_data)) - return -EIO; - - return ops->check_processor_compatibility(); + return 0; } =20 bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu) --=20 2.38.1.431.g37b22c650d-goog