From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f202.google.com (mail-pl1-f202.google.com [209.85.214.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 757C522A7E4 for ; Sat, 6 Dec 2025 01:11:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764983471; cv=none; b=dbIUkkxBT82brT5j2ITYt7DKcXQA/3rZYmts+9FCbLtKefhHH8MPiIv4/zGQ6ZamAvCw+4EKJ1YUvVEDMOkrtOW3ULRh+NCQx/c/bZrF9tRMTFtyzINMVDBvtMvcHi85KQIOee90kaasu0Y/3f57BIyDxC176srJQxKhk/q5wG8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764983471; c=relaxed/simple; bh=Xoj3VzQYzVhpJbx4kNzoLA3tCFxy7VEFT4XaIsLRops=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=EaHE9CPHq3EgH+E5azunwFbrGutZj9Rn0RGZx85gq6izfUe9cI3cQjZSWOyaCGthJsSMkEmybZRkGR2k0FJEO7QSwuN3eHdBtiwBOl4TayS3RH+EDUmejyoxETyBN5nxBCw/igG5/fnGrFkC/BoxhBbyOOziCt0Ma8MKraxajvY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=bMQhYVB2; arc=none smtp.client-ip=209.85.214.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="bMQhYVB2" Received: by mail-pl1-f202.google.com with SMTP id d9443c01a7336-295915934bfso37435325ad.0 for ; Fri, 05 Dec 2025 17:11:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1764983469; x=1765588269; darn=lists.linux.dev; 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=pC6DfslZcu3nvvZIIA0BpqpSQzylE5RCvOKLxGkj7nQ=; b=bMQhYVB2iFsr3URnSzzths1yfYHpJN7iTtfaxvghcZsxct0PB3cbxIp4ecokC1Kvlr Ne0NayghXTMJ9todzI0XvNzGaQaqHTOo2q8zbYZu9veT0mHplxd23OeagPlKpdALpLKb 2rS07+/52V4UgpcmKOJ5tQIkvKYn1NnJTdFdzxMgelsDBttseX1wLGOINfB9/z7lSha7 02YWOGIUCD74EulPnBn6ReumISbav7T/YBYfYCbO9D8ZPl8TxJR/MurlXDiX8bdgAtZ9 qU5PwUVAHqXNf710v/TEWCkZhi4oMv7Hdk2zgCA5bn40Isu7ZZ+RK6C2eD3ZqMZ2vwxg Hnng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1764983469; x=1765588269; 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=pC6DfslZcu3nvvZIIA0BpqpSQzylE5RCvOKLxGkj7nQ=; b=oo+ibqYDhoK5pQAPv78qIhKWJyR5+iqchfsNbIv6KBpeeK+Dt85IlcxsiwVq70OFi1 2dhcDwevl83szsMgK23xrVMTuAD+AWoVnhUTAZX5g8o0I/u/yxmO5n+mpfYXC9ltaFbc A7+vsQEVzSd7HJPsyv6fEncJE32NvgDilBliHpLeBg69UDn+7y7ZzuVx35wGlbeb62wU YpYUDqNjZ/844MSNNmxoCM99B+s5q32QTXHEzSbVSqTvVDY/aGk6zptfY0tHKPpC+TBO trronwZbW2mepyTCme5VNLnOEL1Wt/TT6Ve7lAS96/uafruNVMzLNjieNaQoGjtjABXh hgzQ== X-Forwarded-Encrypted: i=1; AJvYcCUda+mgW9qNrOjVCDpPH2IMEoCAAR5rkGArt4hMvS7qvnb6nYKwn4HaxcwVBN3pFnKLlg/39hbO/JAo@lists.linux.dev X-Gm-Message-State: AOJu0Yy4fCHiCBHtNR4CD5S0Ow0hooJw4sXrO6vHH4q7WoKJ+IxnkYE/ k8hzI/4Q19VGKU4ppxpI6VVtzmMqVHBxjPrzWx3fS3O7h4XTkodxg1+kZFWLJgDCqc8sIkWETSX kVOKflQ== X-Google-Smtp-Source: AGHT+IHqg7v/oM3O+Iza+gbHQ+Fut3uvvdzLynuyyGHbiI9eTt5zTPTdsfs0StG85k5cWuU3XEHxZlf+cm8= X-Received: from pldo13.prod.google.com ([2002:a17:903:8d:b0:27e:ed03:b5a5]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:e805:b0:295:ac6f:c899 with SMTP id d9443c01a7336-29df5dd24f3mr8573855ad.47.1764983468487; Fri, 05 Dec 2025 17:11:08 -0800 (PST) Reply-To: Sean Christopherson Date: Fri, 5 Dec 2025 17:10:48 -0800 In-Reply-To: <20251206011054.494190-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251206011054.494190-1-seanjc@google.com> X-Mailer: git-send-email 2.52.0.223.gf5cc29aaa4-goog Message-ID: <20251206011054.494190-2-seanjc@google.com> Subject: [PATCH v2 1/7] KVM: x86: Move kvm_rebooting to x86 From: Sean Christopherson To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Kiryl Shutsemau , Sean Christopherson , Paolo Bonzini Cc: linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, kvm@vger.kernel.org, Chao Gao , Dan Williams Content-Type: text/plain; charset="UTF-8" Move kvm_rebooting, which is only read by x86, to KVM x86 so that it can be moved again to core x86 code. Add a "shutdown" arch hook to facilate setting the flag in KVM x86. Signed-off-by: Sean Christopherson --- arch/x86/kvm/x86.c | 13 +++++++++++++ arch/x86/kvm/x86.h | 1 + include/linux/kvm_host.h | 2 +- virt/kvm/kvm_main.c | 14 +++++++------- 4 files changed, 22 insertions(+), 8 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 0c6d899d53dd..80cb882f19e2 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -694,6 +694,9 @@ static void drop_user_return_notifiers(void) kvm_on_user_return(&msrs->urn); } +__visible bool kvm_rebooting; +EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_rebooting); + /* * Handle a fault on a hardware virtualization (VMX or SVM) instruction. * @@ -13100,6 +13103,16 @@ int kvm_arch_enable_virtualization_cpu(void) return 0; } +void kvm_arch_shutdown(void) +{ + /* + * Set kvm_rebooting to indicate that KVM has asynchronously disabled + * hardware virtualization, i.e. that relevant errors and exceptions + * aren't entirely unexpected. + */ + kvm_rebooting = true; +} + void kvm_arch_disable_virtualization_cpu(void) { kvm_x86_call(disable_virtualization_cpu)(); diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index fdab0ad49098..40993348a967 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -54,6 +54,7 @@ struct kvm_host_values { u64 arch_capabilities; }; +extern bool kvm_rebooting; void kvm_spurious_fault(void); #define SIZE_OF_MEMSLOTS_HASHTABLE \ diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index d93f75b05ae2..a453fe6ce05a 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1621,6 +1621,7 @@ static inline void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) {} #endif #ifdef CONFIG_KVM_GENERIC_HARDWARE_ENABLING +void kvm_arch_shutdown(void); /* * kvm_arch_{enable,disable}_virtualization() are called on one CPU, under * kvm_usage_lock, immediately after/before 0=>1 and 1=>0 transitions of @@ -2302,7 +2303,6 @@ static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu) #ifdef CONFIG_KVM_GENERIC_HARDWARE_ENABLING extern bool enable_virt_at_load; -extern bool kvm_rebooting; #endif extern unsigned int halt_poll_ns; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index f1f6a71b2b5f..3278ee9381bd 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -5586,13 +5586,15 @@ bool enable_virt_at_load = true; module_param(enable_virt_at_load, bool, 0444); EXPORT_SYMBOL_FOR_KVM_INTERNAL(enable_virt_at_load); -__visible bool kvm_rebooting; -EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_rebooting); - static DEFINE_PER_CPU(bool, virtualization_enabled); static DEFINE_MUTEX(kvm_usage_lock); static int kvm_usage_count; +__weak void kvm_arch_shutdown(void) +{ + +} + __weak void kvm_arch_enable_virtualization(void) { @@ -5646,10 +5648,9 @@ static int kvm_offline_cpu(unsigned int cpu) static void kvm_shutdown(void) { + kvm_arch_shutdown(); + /* - * Disable hardware virtualization and set kvm_rebooting to indicate - * that KVM has asynchronously disabled hardware virtualization, i.e. - * that relevant errors and exceptions aren't entirely unexpected. * Some flavors of hardware virtualization need to be disabled before * transferring control to firmware (to perform shutdown/reboot), e.g. * on x86, virtualization can block INIT interrupts, which are used by @@ -5658,7 +5659,6 @@ static void kvm_shutdown(void) * 100% comprehensive. */ pr_info("kvm: exiting hardware virtualization\n"); - kvm_rebooting = true; on_each_cpu(kvm_disable_virtualization_cpu, NULL, 1); } -- 2.52.0.223.gf5cc29aaa4-goog