From nobody Thu Sep 18 21:55:08 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 03243C41513 for ; Fri, 21 Jul 2023 20:21:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231458AbjGUUVC (ORCPT ); Fri, 21 Jul 2023 16:21:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38926 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231503AbjGUUUf (ORCPT ); Fri, 21 Jul 2023 16:20:35 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 488923A8C for ; Fri, 21 Jul 2023 13:19:50 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id 3f1490d57ef6-c8f360a07a2so2266280276.2 for ; Fri, 21 Jul 2023 13:19:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1689970779; x=1690575579; 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=0ufOgL/ovXKIGQEYukNshYDCW2QOagoVOtmN2psRo9c=; b=b12Ttu/+eAKMYYr+ZtWZDhO9f8tIZzhiWDUyfkYKkQAGZ8PdoM7SUfhXHfFjda9SM8 wHTbZcaIxbvpo6ZC55UJc/d6aRulVjhV0CUNJrul/2S2FZZweyArAU2EVJUBrcBBXquN vU05kJwjb1NAJHt3dCz+9FG0HhYvLHlgxT/IyC/seKzCxR/UFSkK+WuX3JN2T1Zjexz/ cn2JU6UHxz3FopptseYCiqsx2AYAfIKAmTFUMY10/d1txCxH5yYIetLq3/s5ohB7VhvC xsH/zGKExBxyiHcmYi130rGplxqvQDFOSlqz2e7jwYp5AIvNTdYLOF8Ndw+tBLCt7PL8 HW5A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689970779; x=1690575579; 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=0ufOgL/ovXKIGQEYukNshYDCW2QOagoVOtmN2psRo9c=; b=jqmezKvGRiaAfz+LvDoeIAf4E9uHBtMnT/dIotQcBOBA7EZvI0Uuo+T3fdZ9eVApkF 3q60f9tKOK6MbhTC4nwmFFEPx9d1zSAuiYOBEcUTB1fndOLUYluLifeCRqFuVjbIhkyD JL7nnr4eYtBHkcADK1r9Kay4lN0h3IZ14KFjmVJStCbpZ6W6AtQANHn7ONTK8/kV9A26 zWaDCvxKRfidb7CT8LgjTN8FludMiIY4RMMWa14TORgzruUEeCEKbiJPaT1JlX0NDZRj rTW1QOWulVqqd+zj+LTBwBLLg172g5jqHoTisbLLfqD1uLlrIMYt1n533Qr3MRMzGOwK +/Rw== X-Gm-Message-State: ABy/qLZZpcZCKK5bf+nqujVJkS03UwAsReJl/64z+lwMqBtRnlKeY+S/ 0fCjKpYfJNaWaFnNSLhgJ7ICpU+yDeM= X-Google-Smtp-Source: APBJJlEMRg8khkFQs+v6K4Haj1LsdDQNVMJ0EH61NH5YR90us2W3yxUe/jzK4/gqbgOaQJvbK9pl9eS5wa8= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a25:81cf:0:b0:c5d:dac2:cb2a with SMTP id n15-20020a2581cf000000b00c5ddac2cb2amr18048ybm.13.1689970779472; Fri, 21 Jul 2023 13:19:39 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 21 Jul 2023 13:18:57 -0700 In-Reply-To: <20230721201859.2307736-1-seanjc@google.com> Mime-Version: 1.0 References: <20230721201859.2307736-1-seanjc@google.com> X-Mailer: git-send-email 2.41.0.487.g6d72f3e995-goog Message-ID: <20230721201859.2307736-18-seanjc@google.com> Subject: [PATCH v4 17/19] KVM: x86: Force kvm_rebooting=true during emergency reboot/crash From: Sean Christopherson To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Sean Christopherson , Paolo Bonzini Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Andrew Cooper , Kai Huang , Chao Gao Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Set kvm_rebooting when virtualization is disabled in an emergency so that KVM eats faults on virtualization instructions even if kvm_reboot() isn't reached. Reviewed-by: Kai Huang Signed-off-by: Sean Christopherson --- arch/x86/kvm/svm/svm.c | 2 ++ arch/x86/kvm/vmx/vmx.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 47f9c7156609..8d1b3c801629 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -605,6 +605,8 @@ static inline void kvm_cpu_svm_disable(void) =20 static void svm_emergency_disable(void) { + kvm_rebooting =3D true; + kvm_cpu_svm_disable(); } =20 diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 0e1f3856a9be..5d21931842a5 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -771,6 +771,8 @@ static void vmx_emergency_disable(void) int cpu =3D raw_smp_processor_id(); struct loaded_vmcs *v; =20 + kvm_rebooting =3D true; + list_for_each_entry(v, &per_cpu(loaded_vmcss_on_cpu, cpu), loaded_vmcss_on_cpu_link) vmcs_clear(v->vmcs); --=20 2.41.0.487.g6d72f3e995-goog