From patchwork Tue Jul 13 16:32:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 12374519 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=-21.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=ham 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 E005CC07E95 for ; Tue, 13 Jul 2021 16:33:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C5C366120A for ; Tue, 13 Jul 2021 16:33:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229666AbhGMQg0 (ORCPT ); Tue, 13 Jul 2021 12:36:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44926 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229454AbhGMQgZ (ORCPT ); Tue, 13 Jul 2021 12:36:25 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 74BB2C0613E9 for ; Tue, 13 Jul 2021 09:33:35 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id a4-20020a25f5040000b029054df41d5cceso27748755ybe.18 for ; Tue, 13 Jul 2021 09:33:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=reply-to:date:message-id:mime-version:subject:from:to:cc; bh=eCce4R3xq3isKOouF5FTNEunRJdZmdeo4W5/csS7Oys=; b=WW7f7RhIOPkS4TYxNubIzf63Dv/yms2kaYN5+Rxv5Q9YroM0R2ch1JNCqJSPPwyUlo KAF82pu3Bp4g/Pn+xuTKeUAwB/TO69M6o1eZRkVdgC1tee/P/80S/uaAp7ti/HK3esQk Q0ute6Gan86natVKaRfSeabXGhIzjPsBIB/HhoYgyxThITgbW2GiDLBWHLW8iIwxtJNt vochZXnSRORkeDzrndGVSRqhSDgvh8hxbxWMzFFi/rSojFqOf7TCcj+bXcv3KCd5+lEm 8V/XzYdyWhy/C8ZT/zuzaVoIWT8zpBN0LW61lb5Tz/vRzpRc6UN871GxHFqxOTrEkUZC 5izQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:reply-to:date:message-id:mime-version:subject :from:to:cc; bh=eCce4R3xq3isKOouF5FTNEunRJdZmdeo4W5/csS7Oys=; b=YNWwiWjTBtj6jppYP1EJ70ECzE4IFNdL7facOQfYgkz/M0ARxUexr9Hrchtpln2LU7 XSwsPLA/CldJYD7DKKIKXVK709Q/Jl+fgHdC9fKgpRcZ+4bld4TnVLrVHFyqSD7CYbqS 1u6xPE3xzlLO/nwHAw747g0H8ieUij0+JnRNQuapLoc30mvEqO5hlXp+ElQVpuIjoP66 C+oiHJJzornwmSX4t9K0mQzXP3y+jVYI/rAyOD41Pj9fKCka3K50lIlAZi9P0hL1a/3W do4R71TX3ilg6HzzGe7Drv5OH/ohtOfHj9apSd+KWX8oYcL26qQWDw6j/ghIrJp04rl3 Po9A== X-Gm-Message-State: AOAM530QhTYpXKz/Yqoo5KtE1ONid0Kw5d1ykJVio8/kvimk/AaJikYe d8pC+HrIQmoaggHgD9lMv0mngovL/eA= X-Google-Smtp-Source: ABdhPJx9JGW3qNNkd9oyzMw9G4hOv/gl13Yd2iL9EaRCo7CMB+rG3efy24zY7EhlUxx50+F6I7t4jPBb7to= X-Received: from seanjc798194.pdx.corp.google.com ([2620:15c:90:200:825e:11a1:364b:8109]) (user=seanjc job=sendgmr) by 2002:a25:8743:: with SMTP id e3mr6953766ybn.125.1626194014534; Tue, 13 Jul 2021 09:33:34 -0700 (PDT) Reply-To: Sean Christopherson Date: Tue, 13 Jul 2021 09:32:38 -0700 Message-Id: <20210713163324.627647-1-seanjc@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.32.0.93.g670b81a890-goog Subject: [PATCH v2 00/46] KVM: x86: vCPU RESET/INIT fixes and consolidation 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, Reiji Watanabe Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The end goal of this series is to consolidate the RESET/INIT code, both to deduplicate code and to try to avoid divergent behavior/bugs, e.g. SVM only recently started updating vcpu->arch.cr4 on INIT. The TL;DR of why it takes 40+ patches to get there is that the RESET/INIT flows have multiple latent bugs and hidden dependencies, but "work" because they're rarely touched, are mostly fixed flows in both KVM and the guest, and because guests don't sanity check state after INIT. While several of the patches have Fixes tags, I am absolutely terrified of backporting most of them due to the likelihood of breaking a different version of KVM. And, for the most part the bugs are benign in the sense no guest has actually encountered any of these bugs. For that reason, I intentionally omitted stable@ entirely. The only patches I would consider even remotely safe for backporting are the first four patches in the series. v2: - Collect Reviews. [Reiji] - Fix an apic->base_address initialization goof. [Reiji] - Add patch to flush TLB on INIT. [Reiji] - Add patch to preserved CR0.CD/NW on INIT. [Reiji] - Add patch to emulate #INIT after shutdown on SVM. [Reiji] - Add patch to consolidate arch.hflags code. [Reiji] - Drop patch to omit VMWRITE zeroing. [Paolo, Jim] - Drop several MMU patches (moved to other series). v1: https://lkml.kernel.org/r/20210424004645.3950558-1-seanjc@google.com Sean Christopherson (46): KVM: x86: Flush the guest's TLB on INIT KVM: nVMX: Set LDTR to its architecturally defined value on nested VM-Exit KVM: SVM: Zero out GDTR.base and IDTR.base on INIT KVM: VMX: Set EDX at INIT with CPUID.0x1, Family-Model-Stepping KVM: SVM: Require exact CPUID.0x1 match when stuffing EDX at INIT KVM: SVM: Fall back to KVM's hardcoded value for EDX at RESET/INIT KVM: VMX: Remove explicit MMU reset in enter_rmode() KVM: SVM: Drop explicit MMU reset at RESET/INIT KVM: SVM: Drop a redundant init_vmcb() from svm_create_vcpu() KVM: VMX: Move init_vmcs() invocation to vmx_vcpu_reset() KVM: x86: WARN if the APIC map is dirty without an in-kernel local APIC KVM: x86: Remove defunct BSP "update" in local APIC reset KVM: x86: Migrate the PIT only if vcpu0 is migrated, not any BSP KVM: x86: Don't force set BSP bit when local APIC is managed by userspace KVM: x86: Set BSP bit in reset BSP vCPU's APIC base by default KVM: VMX: Stuff vcpu->arch.apic_base directly at vCPU RESET KVM: x86: Open code necessary bits of kvm_lapic_set_base() at vCPU RESET KVM: x86: Consolidate APIC base RESET initialization code KVM: x86: Move EDX initialization at vCPU RESET to common code KVM: SVM: Don't bother writing vmcb->save.rip at vCPU RESET/INIT KVM: VMX: Invert handling of CR0.WP for EPT without unrestricted guest KVM: VMX: Remove direct write to vcpu->arch.cr0 during vCPU RESET/INIT KVM: VMX: Fold ept_update_paging_mode_cr0() back into vmx_set_cr0() KVM: nVMX: Do not clear CR3 load/store exiting bits if L1 wants 'em KVM: VMX: Pull GUEST_CR3 from the VMCS iff CR3 load exiting is disabled KVM: x86/mmu: Skip the permission_fault() check on MMIO if CR0.PG=0 KVM: VMX: Process CR0.PG side effects after setting CR0 assets KVM: VMX: Skip emulation required checks during pmode/rmode transitions KVM: nVMX: Don't evaluate "emulation required" on nested VM-Exit KVM: SVM: Tweak order of cr0/cr4/efer writes at RESET/INIT KVM: SVM: Drop redundant writes to vmcb->save.cr4 at RESET/INIT KVM: SVM: Stuff save->dr6 at during VMSA sync, not at RESET/INIT KVM: VMX: Skip pointless MSR bitmap update when setting EFER KVM: VMX: Refresh list of user return MSRs after setting guest CPUID KVM: VMX: Don't _explicitly_ reconfigure user return MSRs on vCPU INIT KVM: x86: Move setting of sregs during vCPU RESET/INIT to common x86 KVM: VMX: Remove obsolete MSR bitmap refresh at vCPU RESET/INIT KVM: nVMX: Remove obsolete MSR bitmap refresh at nested transitions KVM: VMX: Don't redo x2APIC MSR bitmaps when userspace filter is changed KVM: VMX: Remove unnecessary initialization of msr_bitmap_mode KVM: VMX: Smush x2APIC MSR bitmap adjustments into single function KVM: VMX: Remove redundant write to set vCPU as active at RESET/INIT KVM: VMX: Move RESET-only VMWRITE sequences to init_vmcs() KVM: SVM: Emulate #INIT in response to triple fault shutdown KVM: SVM: Drop redundant clearing of vcpu->arch.hflags at INIT/RESET KVM: x86: Preserve guest's CR0.CD/NW on INIT arch/x86/include/asm/kvm_host.h | 5 - arch/x86/kvm/i8254.c | 3 +- arch/x86/kvm/lapic.c | 26 +-- arch/x86/kvm/svm/sev.c | 1 + arch/x86/kvm/svm/svm.c | 48 ++---- arch/x86/kvm/vmx/nested.c | 24 ++- arch/x86/kvm/vmx/vmx.c | 270 +++++++++++++++----------------- arch/x86/kvm/vmx/vmx.h | 5 +- arch/x86/kvm/x86.c | 52 +++++- 9 files changed, 211 insertions(+), 223 deletions(-)